CN222640570U - Clamps, fixation pins, orthopedic external fixation devices - Google Patents

Abstract

The utility model provides a clamping device, a fixing needle and an orthopedic external fixing device, wherein the clamping device comprises a fixing plate and a clamping assembly, a through hole for the fixing needle to pass through is formed in the fixing plate, a first clamping plate and a second clamping plate of the clamping assembly are respectively arranged on two sides of the fixing plate in the thickness direction and are respectively arranged on the fixing needle, the first clamping plate and the second clamping plate are respectively abutted with end faces on two sides of the fixing plate so as to limit the movement of the fixing plate in the axial direction of the fixing needle, and the friction force between the two clamping plates and the fixing plate can further limit the movement of the fixing plate in the radial direction of the fixing needle, so that indirect connection between the fixing needle and the fixing plate is realized. In the whole connection process, the fixing needle can not generate any direct contact with the fixing plate, and the fixing needle can pass through the fixing plate at various angles, so that the positioning precision requirement of the fixing needle is reduced, and the connection difficulty of the fixing needle and the fixing plate is reduced.

Description

Clamping device, fixing needle and orthopedic external fixing device

Technical Field

The utility model relates to the field of medical appliances, in particular to a clamping device, a fixing needle and an orthopedic external fixing device.

Background

When limbs are fractured, especially fracture with serious pulverization, the fracture is mostly accompanied by up-and-down shift or angular dislocation of bones, doctors are required to anatomically reposition the parts of the fracture in operation, and after the reposition is finished, the reposition bones are also required to be fixed by using a fixing device so as to help the bones to recover and heal as soon as possible. In the prior art, the modes for realizing bone fixation after operation are generally divided into an internal fixation mode and an external fixation mode.

The internal fixation device used in the internal fixation mode is generally an internal fixation steel plate structure, and the steel plate is placed in the body of a patient so as to enable the steel plate to be in direct contact with bones, so that the resetting accuracy and the fixation reliability of the fixation mode are high, but if the patient has an open fracture accompanied by serious soft tissue injury, complications such as wound dehiscence, skin necrosis and osteomyelitis can be caused, and the internal fixation mode can damage periosteum and blood circulation, delay the fracture healing time and delay the rehabilitation process of the patient.

The external fixation system (External Fixation System) used in the external fixation procedure is a device that is widely used in orthopedic treatment, particularly in the treatment of complex fractures, bone defects, and correction of deformities. It achieves bone stabilization and support by mounting a scaffold outside the fracture or area in need of treatment. While external fixation systems provide effective treatment in many cases, analysis of their mechanical stability reveals the complexity of the technique and some potential limitations. The external fixing device used in the external fixing mode mainly comprises an external fixing bracket structure and an external fixing steel plate structure, and the used connection mode is usually a connecting rod mode and also has a part of variation of fastening screws. The external fixing support structure is large in size, the support body is heavy, the external fixing support is easy to strike during movement, and stability is poor. After the position of the bone needle driven into the bone is determined, an external mechanical system is required to be built again, and the position stability of the bone needle is easy to maintain. The built external system usually uses a scaffold mode, has poor mechanical stability and huge volume, and is difficult to meet the requirement of free movement. Of course, a special external fixing system also exists, the mechanical stability is strong like that of an annular bracket and the like, but the volume is large, the bone needles needing to be fixed are more, the volume of the external fixing steel plate structure is smaller and more exquisite, the stability is better, and a patient can carry the steel plate to do rehabilitation exercise at early stage, and even load normal life. The main working principle of the external fixing steel plate structure is similar to that of the internal fixing steel plate structure, and bone fixation is realized through the cooperation of the screws and the steel plates, but because the steel plates in the external fixing steel plate structure are arranged outside the body of a patient, damage to the injury of the patient can be reduced, and complications are reduced.

However, the existing external fixation steel plate structure has severe limitations in the practical use process. First is site limitation. The existing external fixation steel plate structure is basically only suitable for the areas of tibia, ankle and the like which are fit with the bone topography, and the steel plates of the areas are fit with the bone topography and have shallow surfaces. The length and strength of the screw used on the steel plate can meet the fixed working distance. Second, use is limited. The principle of locking the steel plate is that the tail part of the screw exists in the matching thread embedded in the screw hole of the steel plate. And such mating threads must be at a fixed angle to achieve locking. The angle is slightly changed, and the connection and fixation of the screw and the steel plate cannot be realized. Therefore, the axes of the screws and the axes of the threaded holes are required to be aligned as completely as possible during the connection process so as to realize the fixed connection of the screws and the steel plate. However, in the actual operation, it is difficult for a doctor to ensure that the screw is driven into the bone of the patient at a set angle, thereby easily causing the axis of the screw and the axis of the screw hole to be incompletely aligned, making it difficult to connect the screw and the steel plate. And the external fixation steel plate structure is connected with a plurality of screws through a steel plate, the axis of each screw needs to be ensured to be aligned with the axis of the corresponding threaded hole on the steel plate in the process, the whole fixation of the external fixation steel plate structure can be realized, the difficulty is extremely high, and the universality of the external fixation steel plate structure is weakened.

Disclosure of utility model

The utility model aims to overcome the defect that in the prior art, the connection difficulty of a steel plate and a screw is high due to direct threaded connection, and provides a clamping device, a fixing needle and an orthopedic external fixing device.

The utility model solves the technical problems by the following technical scheme:

A clamping device for connecting a fixed needle and a fixed plate comprises a fixed plate and a clamping assembly;

The fixing plate is provided with a through hole for the fixing needle to pass through, and the through hole is communicated with the two ends of the fixing plate in the thickness direction;

The clamping assembly comprises a first clamping plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are respectively arranged on two sides of the fixing plate in the thickness direction and are respectively used for being installed on the fixing needle, and the first clamping plate faces one end face of the fixing plate and the second clamping plate faces one end face of the fixing plate and is respectively abutted to the end face of the corresponding side of the fixing plate.

In this scheme, first splint and second splint are fixed on the fixed needle, and the fixed plate clamp is established between first splint and second splint, and first splint and second splint are through the both sides face butt in the thickness direction with the fixed plate to restrict the fixed plate at the axial displacement of fixed needle, and the frictional force between two splint and the fixed plate can further restrict the fixed plate at the radial displacement of fixed needle again, thereby realize indirect connection between fixed needle and the fixed plate. In the whole connection process, the fixing needle can not generate any direct contact with the fixing plate, so that the axis of the fixing needle and the axis of the through hole of the fixing plate do not need to be completely aligned like the prior art, the fixing needle can penetrate through the fixing plate at various angles, the fault tolerance is extremely high, the adaptability is extremely high, the positioning precision requirement of the fixing needle is reduced, and the connection difficulty of the fixing needle and the fixing plate is reduced.

Preferably, the clamping assembly further comprises a first clamping member and a second clamping member;

When the first clamping plate is positioned at the first position, one end face of the first clamping plate, which faces the fixed plate, is abutted against the end face of the corresponding side of the fixed plate;

the second clamping piece is connected with the second clamping plate and used for keeping the second clamping plate at a second position, and when the second clamping plate is located at the second position, one end face of the second clamping plate, which faces the fixing plate, is abutted against the end face of the corresponding side of the fixing plate.

In this scheme, first clamping piece is used for keeping first splint and fixed plate butt, and second clamping piece is used for keeping second splint and fixed plate butt to avoid the connection of fixed needle and fixed plate not hard up, improve the reliability of connection.

Preferably, the fixing needle passes through the first clamping plate and the second clamping plate, and comprises a first external thread section and a second external thread section;

The first clamping plate comprises a first threaded hole, the first threaded hole is in threaded connection with the first external threaded section, and the first clamping piece is used for limiting the first clamping plate to rotate around the axis of the first threaded hole;

The second clamping plate comprises a second threaded hole, the second threaded hole is in threaded connection with the second threaded section, and the second clamping piece is used for limiting the second clamping plate to rotate around the axis of the second threaded hole.

In this scheme, first splint and second splint realize being connected with the fixed needle through threaded connection's mode, and screw structure can be under the condition of not rotating first splint and second splint, restriction first splint and second splint at the epaxial removal of fixed needle to realize first splint and second splint preliminary fixed on the fixed needle. The first clamping piece rotates around the axis of the first threaded hole through limiting the first clamping plate, and the second clamping piece rotates around the axis of the second threaded hole through limiting the second clamping plate, so that the first clamping plate and the second clamping plate are prevented from moving in the axial direction of the fixing needle, the first clamping plate and the second clamping plate are always in butt joint with the fixing plate, and stable connection of the fixing needle and the fixing plate is achieved.

Preferably, the first clamping plate is provided with a first clamping hole, the first clamping hole is communicated with two ends of the first clamping plate in the thickness direction, the first clamping hole is provided with internal threads, the first clamping piece is provided with external threads, the first clamping piece is in threaded connection with the first clamping hole, and the first clamping piece is in abutting connection with the fixing plate;

The second clamping plate is provided with a second clamping hole, the second clamping hole is communicated with two ends of the second clamping plate in the thickness direction, the second clamping hole is provided with internal threads, the second clamping piece is provided with external threads, the second clamping piece is in threaded connection with the second clamping hole, and the second clamping piece is in butt joint with the fixing plate.

In this scheme, through the cooperation between pore wall and the fixed needle of the screw hole on the splint, restricted first splint and second splint around the axis rotation of corresponding clamp hole, again through the cooperation between the pore wall of clamp hole on the splint and the corresponding clamp piece, restricted first splint and second splint around the axis rotation of fixed needle, realized the fixed position of first splint and second splint under the combined action to guarantee that first splint and second splint can remain throughout with the fixed plate butt, improve the stability that fixed needle and fixed plate are connected. Two clamping pieces are in butt joint with the fixed plate, the rotating difficulty of the corresponding clamping plates is further improved through friction force between the clamping pieces and the fixed plate, the position fixation of the first clamping plate and the second clamping plate is further guaranteed, and the connection stability of the fixed needle and the fixed plate is improved.

Preferably, the number of the first clamping holes and the number of the first clamping pieces are the same and are multiple, the first clamping holes are arranged at intervals along the circumferential direction of the first clamping plate, and the first clamping pieces and the first clamping holes are arranged in a one-to-one correspondence manner;

and/or the second clamping holes and the second clamping pieces are the same in number and are multiple, the second clamping holes are arranged at intervals along the circumferential direction of the second clamping plate, and the second clamping pieces and the second clamping holes are arranged in one-to-one correspondence.

In this solution, the above arrangement limits the rotation of the clamping plate relative to the fixed needle and the clamping member by means of the cooperation between the plurality of clamping members and the plurality of corresponding clamping holes on the one hand. On the other hand, the plurality of clamping members and the fixed plate abut to increase the total friction force between the clamping members and the fixed plate, and further limit the rotation of the clamping plate relative to the fixed needle and the clamping members.

Preferably, the projections of the first clamping plates on the fixed plate along the thickness direction of the fixed plate are all positioned on the fixed plate;

And/or the projections of the second clamping plates on the fixed plate along the thickness direction of the fixed plate are all positioned on the fixed plate.

In this scheme, above-mentioned setting prevents that splint from exposing in the fixed plate on the one hand, reduces splint pivoted possibility under the exogenic action. On the other hand can increase the area of contact of splint and fixed plate, improve the frictional force between splint and the fixed plate, increase the region that splint can connect the clamp piece, effectively restrict the rotation of splint for fixed needle and clamp piece.

Preferably, the through hole is a light hole.

In this scheme, the machining precision requirement of unthreaded hole is low, and processing is convenient.

A fixing needle which is fixed by a clamping device for connecting the fixing needle and a fixing plate as described above.

In this scheme, the fixed needle realizes the fixed position through foretell clamping device, and the connection degree of difficulty between fixed needle and the clamping device reduces, and connection reliability improves.

Preferably, the fixed needle satisfies one or more of the following conditions:

a. The thread of the first external thread section of the fixed needle is continuous with the thread of the second external thread section of the fixed needle, or the fixed needle also comprises a first unthreaded section which is positioned between the first external thread section of the fixed needle and the second external thread section of the fixed needle;

b. The fixing needle further comprises a third external thread section, and the third external thread section is arranged on one side of the second external thread section of the fixing needle, which is far away from the second external thread section of the fixing needle;

The threads of the second external thread section and the threads of the third external thread section are continuous, or the fixing needle further comprises a second unthreaded section positioned between the second external thread section and the third external thread section.

In this aspect, the thread continuity of the first external thread section and the second external thread section can save man-hours consumed for dividing the first external thread section and the second external thread section on the fixing needle. The thread interruption of the threads of the first and second external thread segments enables a rapid positioning of the fixation plate relative to the fixation needle. The thread continuity of the second and third external thread segments can save man-hours consumed in dividing the second and third external thread segments on the fixing pin. The thread interruption of the second and third external thread segments enables a rapid positioning of the second clamping plate relative to the fixation needle.

An orthopaedic external fixation device comprising a clamping device for connection of a fixation needle to a fixation plate as described above and a fixation needle as described above, the fixation needle passing through the through hole in the fixation plate.

The utility model has the positive progress effects that the first clamping plate and the second clamping plate are fixed on the fixed needle, the fixed plate is clamped between the first clamping plate and the second clamping plate, the first clamping plate and the second clamping plate are abutted with the two side surfaces of the fixed plate in the thickness direction so as to limit the movement of the fixed plate in the axial direction of the fixed needle, and the friction force between the two clamping plates and the fixed plate can further limit the movement of the fixed plate in the radial direction of the fixed needle, so that the indirect connection between the fixed needle and the fixed plate is realized. In the whole connection process, the fixing needle can not generate any direct contact with the fixing plate, so that the axis of the fixing needle and the axis of the through hole of the fixing plate do not need to be completely aligned like the prior art, the fixing needle can penetrate through the fixing plate at various angles, the fault tolerance is extremely high, the adaptability is extremely high, the positioning precision requirement of the fixing needle is reduced, and the connection difficulty of the fixing needle and the fixing plate is reduced.

Drawings

Fig. 1 is a schematic perspective view of a clamping device according to embodiment 1 of the present utility model.

Fig. 2 is another schematic perspective view of the clamping device in embodiment 1 of the present utility model.

Fig. 3 is a schematic top view of the clamping device of embodiment 1 of the present utility model.

Fig. 4 is a schematic perspective view of a fixing plate according to embodiment 1 of the present utility model.

Fig. 5 is a schematic view showing a part of the internal structure of the clamping device of embodiment 1 of the present utility model.

Fig. 6 is a schematic perspective view of a first clamping plate according to embodiment 1 of the present utility model.

Fig. 7 is a schematic perspective view of a second clamping plate according to embodiment 1 of the present utility model.

Fig. 8 is a schematic view showing a structure in which the first clamping plate of embodiment 1 of the present utility model is clamped to the fixing plate by a different number of first clamping members.

Fig. 9 is a schematic view showing a structure in which the second clamping plate of embodiment 1 of the present utility model is clamped to the fixing plate by a different number of second clamping members.

Fig. 10 is a schematic view showing the internal structure of the fixing plate in which the fixing needle of embodiment 1 of the present utility model is obliquely inserted.

Fig. 11 is a schematic perspective view showing the cooperation between the external fixation device for orthopaedics and the bone according to embodiment 2 of the present utility model.

Fig. 12 is a schematic view showing the internal structure of the external fixation device for orthopaedics and the bone engagement according to embodiment 2 of the present utility model.

Reference numerals illustrate:

Fixing plate 1

Through hole 11

Fixed needle 2

First external thread segment 21

Second external thread segment 22

Third external thread segment 23

Clamping assembly 3

First clamping plate 31

First threaded hole 311

First clamping hole 312

Second clamping plate 32

Second threaded hole 321

Second clamping hole 322

First clamping member 33

Second clamping member 34

Bone 4

Detailed Description

The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.

Example 1

As shown in fig. 1 and 2, the present embodiment discloses a clamping device for connecting a fixing needle 2 and a fixing plate 1 for fixing the fixing needle 2 to the fixing plate 1.

Specifically, as shown in fig. 2 and 3, the fixing plate 1 is provided with a through hole 11, both ends of the through hole 11 in the thickness direction of the fixing plate 1 (Y direction of fig. 2) are penetrated, and the fixing needle 2 passes through the fixing plate 1 in the thickness direction of the fixing plate 1 through the through hole 11.

The fixing plate 1 shown in fig. 4 is a flat plate structure, and in other alternative embodiments, the fixing plate 1 may be designed into other shapes according to the use situation.

Further, the size of the fixing plate 1, the number of the through holes 11 on the fixing plate 1 may be selected according to actual demands.

As shown in fig. 1, 2, and 5 to 7, the clamping assembly 3 includes a first clamping plate 31, a second clamping plate 32, a first clamping member 33, and a second clamping member 34.

As shown in fig. 5, the first clamping plate 31 and the second clamping plate 32 are respectively provided on both sides in the thickness direction of the fixing plate 1, and are both attached to the fixing needle 2, and one end surface of the first clamping plate 31 facing the fixing plate 1 and one end surface of the second clamping plate 32 facing the fixing plate 1 are respectively abutted against the end surfaces on the corresponding sides of the fixing plate 1.

Specifically, as shown in fig. 5 to 7, the first clamping plate 31 includes a first threaded hole 311, both ends of the first threaded hole 311 in the thickness direction of the first clamping plate 31 penetrate, the second clamping plate 32 includes a second threaded hole 321, both ends of the second threaded hole 321 in the thickness direction of the second clamping plate 32 penetrate, and both axes of the first threaded hole 311 and the second threaded hole 321 coincide with the axis of the corresponding fixing needle 2, and the fixing needle 2 passes through the first clamping plate 31 through the first threaded hole 311 and passes through the second clamping plate 32 through the second threaded hole 321. The fixing needle 2 comprises a first external thread section 21 and a second external thread section 22, the first external thread section 21 and the second external thread section 22 are provided with external threads, a first threaded hole 311 is in threaded connection with the first external thread section 21 to realize the installation of the first clamping plate 31 on the fixing needle 2, and a second threaded hole 321 is in threaded connection with the second external thread section 22 to realize the installation of the second clamping plate 32 on the fixing needle 2. The screw structure can restrict the movement of the first clamping plate 31 and the second clamping plate 32 in the axial direction of the fixing needle 2 without rotating the first clamping plate 31 and the second clamping plate 32, thereby achieving the preliminary fixing of the first clamping plate 31 and the second clamping plate 32 on the fixing needle 2.

Further, the threads of the first male screw section 21 and the threads of the second male screw section 22 in the present embodiment are continuous, so that the man-hours consumed for dividing the first male screw section 21 and the second male screw section 22 on the fixing needle 2 can be saved, and the first clamping plate 31 and the second clamping plate 32 are larger in the mountable area of the fixing needle 2, improving the fixing flexibility.

In other alternative embodiments, the threads of the first external thread section 21 and the threads of the second external thread section 22 may also be discontinuous, and the fixing needle 2 further comprises a first unthreaded section located between the first external thread section 21 and the second external thread section 22, which can serve as a positioning indicator for the fixing plate 1, enabling a rapid positioning of the fixing plate 1 relative to the fixing needle 2.

The first clamping plate 31 and the second clamping plate 32 in the embodiment have the same structure, that is, the shapes and the sizes of the two clamping plates are the same, so that only one type of clamping plate needs to be produced, the manufacturing cost is reduced, the first clamping plate 31 and the second clamping plate 32 do not need to be distinguished during installation, and the installation efficiency is improved. In other alternative embodiments, the first clamping plate 31 and the second clamping plate 32 may also have different structures, respectively.

As shown in fig. 5, the first clamping plate 31 and the second clamping plate 32 are fixed on the fixing needle 2, the fixing plate 1 is sandwiched between the first clamping plate 31 and the second clamping plate 32, the first clamping plate 31 and the second clamping plate 32 are abutted with two side surfaces in the thickness direction of the fixing plate 1 to limit the movement of the fixing plate 1 in the axial direction of the fixing needle 2, and the friction force between the first clamping plate 31 and the fixing plate 1 and the friction force between the second clamping plate 32 and the fixing plate 1 can further limit the movement of the fixing plate 1 in the radial direction of the fixing needle 2, so that the indirect connection between the fixing needle 2 and the fixing plate 1 is realized.

In the whole connection process, the fixing needle 2 can not generate any direct contact with the fixing plate 1, so that the axis of the fixing needle 2 and the axis of the through hole 11 of the fixing plate 1 do not need to be completely aligned like the prior art, the fixing needle 2 can penetrate through the fixing plate 1 at various angles, the fault tolerance is extremely high, the adaptability is extremely high, the positioning precision requirement of the fixing needle 2 is reduced, and the connection difficulty of the fixing needle 2 and the fixing plate 1 is reduced.

Further, the through hole 11 in this embodiment is a light hole, and the requirement on processing precision of the light hole is low, and the processing is convenient.

Further, as shown in fig. 5, the diameter of the through hole 11 is larger than that of the fixing needle 2, so that the fixing needle 2 can conveniently pass through the fixing plate 1 at various angles, and the processing difficulty is lower.

As shown in fig. 1 and 5, the first clamping member 33 is connected with the first clamping plate 31, and the first clamping member 33 is used for keeping the first clamping plate 31 in the first position so as to keep the first clamping plate 31 and the fixing plate 1 in abutting connection, so that connection looseness of the fixing needle 2 and the fixing plate 1 is avoided, and connection reliability is improved. The first position in the present embodiment does not refer to a specific position on the fixing needle 2, but refers to a position where the end surface of the first clamping plate 31 facing the fixing plate 1 can abut against the end surface on the opposite side of the fixing plate 1 (the upper end surface of the fixing plate 1 in fig. 5).

Specifically, since the first clamping plate 31 and the fixing needle 2 are in threaded connection, the first clamping member 33 in the present embodiment restricts the axial movement of the first clamping plate 31 along the fixing needle 2 by restricting the rotation of the first clamping plate 31 around the axis of the first threaded hole 311, thereby ensuring that the first clamping plate 31 always abuts against the fixing plate 1, and achieving stable connection of the fixing needle 2 and the fixing plate 1. As shown in fig. 1, 5 and 6, the first clamping plate 31 is provided with a first clamping hole 312, the first clamping hole 312 penetrates through both ends in the thickness direction of the first clamping plate 31, the first clamping hole 312 is provided with an internal thread, the first clamping member 33 is provided with an external thread, the first clamping member 33 is screwed with the first clamping hole 312, and the first clamping member 33 abuts against the fixing plate 1. In this embodiment, through the cooperation between the hole wall of the first threaded hole 311 on the first clamping plate 31 and the fixing needle 2, the rotation of the first clamping plate 31 around the axis of the first clamping hole 312 is limited, and through the cooperation between the hole wall of the first clamping hole 312 on the first clamping plate 31 and the first clamping piece 33, the rotation of the first clamping plate 31 around the axis of the fixing needle 2 is limited, and the position fixing of the first clamping plate 31 is realized under the combined action, so that the first clamping plate 31 can always keep abutting with the fixing plate 1, and the connection stability of the fixing needle 2 and the fixing plate 1 is improved. In addition, the first clamping piece 33 is abutted with the fixed plate 1, the rotating difficulty of the first clamping plate 31 is further improved through the friction force between the first clamping piece 33 and the fixed plate 1, the position fixing of the first clamping plate 31 is further ensured, and the connection stability of the fixed needle 2 and the fixed plate 1 is improved.

Further, in this embodiment, the number of the first clamping holes 312 and the number of the first clamping members 33 are the same and are plural, the plurality of first clamping holes 312 are arranged at intervals along the circumferential direction of the first clamping plate 31, the plurality of first clamping members 33 and the plurality of first clamping holes 312 are arranged in a one-to-one correspondence, and one first clamping member 33 is in threaded connection with one first clamping hole 312. The present embodiment restricts the rotation of the first clamping plate 31 relative to the fixed needle 2 and the first clamping member 33 by the cooperation of the hole walls of the plurality of first clamping holes 312 and the plurality of first clamping members 33, and the abutment of the plurality of first clamping members 33 and the fixed plate 1 can increase the total friction force between the first clamping member 33 and the fixed plate 1, further restricting the rotation of the first clamping plate 31 relative to the fixed needle 2 and the first clamping member 33.

As shown in fig. 1, the number of the first clamping members 33 in the single clamping assembly 3 in the present embodiment is specifically four. In other alternative embodiments, the number of first clamping members 33 in a single clamping assembly 3 may be designed according to actual requirements, at least one. Fig. 8 illustrates a case where the first clamping plate 31 is clamped to the fixed plate 1 by a different number of first clamping members 33, and of course the number of first clamping members 33 in a single clamping assembly 3 is not limited to the number illustrated in fig. 8.

Further, as shown in fig. 3, the projections of the first clamping plate 31 on the fixing plate 1 along the thickness direction of the fixing plate 1 are all located on the fixing plate 1, so that on one hand, the first clamping plate 31 is prevented from being exposed to the fixing plate 1, and the possibility that the first clamping plate 31 rotates under the action of external force is reduced. On the other hand, the contact area between the first clamping plate 31 and the fixed plate 1 can be increased, the friction force between the first clamping plate 31 and the fixed plate 1 is improved, and the area where the first clamping plate 31 can be connected with the first clamping piece 33 is increased, so that the rotation of the first clamping plate 31 relative to the fixed needle 2 and the first clamping piece 33 is effectively limited.

As shown in fig. 2 and 5, the second clamping member 34 is connected to the second clamping plate 32, and the second clamping member 34 is used for keeping the second clamping plate 32 in the second position so as to keep the second clamping plate 32 and the fixing plate 1 in abutting connection, so that loose connection between the fixing needle 2 and the fixing plate 1 is avoided, and connection reliability is improved. The second position in the present embodiment does not refer to a specific position on the fixing needle 2, but refers to a position where the end surface of the second clamping plate 32 facing the fixing plate 1 can abut against the end surface on the opposite side of the fixing plate 1 (the upper end surface of the fixing plate 1 in fig. 5).

Specifically, since the second clamping plate 32 and the fixing needle 2 are in threaded connection, the second clamping member 34 in the present embodiment restricts the axial movement of the second clamping plate 32 along the fixing needle 2 by restricting the rotation of the second clamping plate 32 around the axis of the second threaded hole 321, so as to ensure that the second clamping plate 32 is always abutted against the fixing plate 1, and achieve stable connection of the fixing needle 2 and the fixing plate 1. As shown in fig. 2, 5 and 7, the second clamping plate 32 is provided with a second clamping hole 322, both ends of the second clamping hole 322 in the thickness direction of the second clamping plate 32 are penetrated, the second clamping hole 322 is provided with an internal thread, the second clamping member 34 is provided with an external thread, the second clamping member 34 is in threaded connection with the second clamping hole 322, and the second clamping member 34 abuts against the fixing plate 1. In this embodiment, through the cooperation between the hole wall of the second threaded hole 321 on the second clamping plate 32 and the fixing needle 2, the rotation of the second clamping plate 32 around the axis of the second clamping hole 322 is limited, and through the cooperation between the hole wall of the second clamping hole 322 on the second clamping plate 32 and the second clamping piece 34, the rotation of the second clamping plate 32 around the axis of the fixing needle 2 is limited, and the position fixation of the second clamping plate 32 is realized under the combined action, so that the second clamping plate 32 can always keep abutting with the fixing plate 1, and the connection stability of the fixing needle 2 and the fixing plate 1 is improved. In addition, the second clamping piece 34 is abutted with the fixed plate 1, the rotating difficulty of the second clamping plate 32 is further improved through the friction force between the second clamping piece 34 and the fixed plate 1, the position fixing of the second clamping plate 32 is further ensured, and the connection stability of the fixed needle 2 and the fixed plate 1 is improved.

Further, in the present embodiment, the number of the second clamping holes 322 and the number of the second clamping pieces 34 are the same and are multiple, the plurality of second clamping holes 322 are arranged at intervals along the circumferential direction of the second clamping plate 32, the plurality of second clamping pieces 34 and the plurality of second clamping holes 322 are arranged in a one-to-one correspondence manner, and one second clamping piece 34 is in threaded connection with one second clamping hole 322. The present embodiment limits the rotation of the second clamping plate 32 relative to the fixed needle 2 and the second clamping member 34 by the cooperation of the hole walls of the plurality of second clamping holes 322 and the plurality of second clamping members 34, and the abutment of the plurality of second clamping members 34 and the fixed plate 1 can increase the total friction force between the second clamping member 34 and the fixed plate 1, further limiting the rotation of the second clamping plate 32 relative to the fixed needle 2 and the second clamping member 34.

As shown in fig. 2, the number of the second clamping members 34 in the single clamping assembly 3 in the present embodiment is specifically four. In other alternative embodiments, the number of second clamping members 34 may be at least one, as desired. Fig. 9 illustrates a case where the second clamping plate 32 is clamped to the fixed plate 1 by a different number of second clamping members 34, and of course the number of second clamping members 34 in a single clamping assembly 3 is not limited to the number illustrated in fig. 9.

Wherein the number of first clamping members 33 and second clamping members 34 in a single clamping assembly 3 may be the same or different.

Further, the projections of the second clamping plate 32 on the fixing plate 1 along the thickness direction of the fixing plate 1 are all located on the fixing plate 1, so that on one hand, the second clamping plate 32 is prevented from being exposed out of the fixing plate 1, and the possibility that the second clamping plate 32 rotates under the action of external force is reduced. On the other hand, the contact area between the second clamping plate 32 and the fixed plate 1 can be increased, the friction force between the second clamping plate 32 and the fixed plate 1 is improved, and the area where the second clamping plate 32 can be connected with the second clamping piece 34 is increased, so that the rotation of the second clamping plate 32 relative to the fixed needle 2 and the second clamping piece 34 is effectively limited.

In this embodiment, the first clamping member 33 and the second clamping member 34 are both of a bolt structure, and in other alternative embodiments, other clamping structures capable of achieving the above-described functions may be used for the first clamping member 33 and the second clamping member 34.

Fig. 5 shows that the axis of the fixing needle 2 is parallel to the thickness direction of the fixing plate 1, and in this state, the first clamping plate 31 and the second clamping plate 32 are entirely abutted against the fixing plate 1 toward one end face of the fixing plate 1. In other alternative embodiments, as shown in fig. 10, when the fixing needle 2 is inserted into the through hole 11 of the fixing plate 1 at an inclined angle with respect to the fixing plate 1, the first clamping plate 31 and the second clamping plate 32 are only partially abutted against the fixing plate 1 toward one end surface of the fixing plate 1 (i.e., the axis of the fixing needle 2 is not parallel to the thickness direction of the fixing plate 1), the first clamping member 33 passes through the first clamping plate 31 to be abutted against the corresponding side surface of the fixing plate 1, and the second clamping member 34 passes through the second clamping plate 32 to be abutted against the corresponding side surface of the fixing plate 1, thereby securing the clamping strength and securing the stability of fixing the fixing needle 2 on the fixing plate 1.

In other alternative embodiments, the first clamping plate 31 and the second clamping plate 32 may not abut against the fixing plate 1, and only the first clamping member 33 and the second clamping member 34 abut against the fixing plate 1 to fix the fixing needle 2 and the fixing plate 1. Specifically, the first clamping member 33 and the second clamping member 34 abut against both side surfaces in the thickness direction of the fixing plate 1 to restrict movement of the fixing plate 1 in the axial direction of the fixing needle 2, and the friction force between the first clamping member 33 and the fixing plate 1 and the friction force between the second clamping member 34 and the fixing plate 1 further restrict movement of the fixing plate 1 in the radial direction of the fixing needle 2, thereby achieving connection between the fixing needle 2 and the fixing plate 1. Further, since the first clamping member 33 restricts the rotation of the first clamping plate 31 about the axis of the fixed needle 2 and the second clamping member 34 restricts the rotation of the second clamping plate 32 about the axis of the fixed needle 2, even if the first clamping plate 31 and the second clamping plate 32 do not abut against the fixed plate 1, the first clamping plate 31 and the second clamping plate 32 can be fixed at the position of the fixed needle 2 without movement along the axis of the fixed needle 2.

In other alternative embodiments, the first clamping plate 31 and the second clamping plate 32 may also be mounted on the fixing needle 2 in other ways. For example, a groove extending in the circumferential direction of the fixing needle 2 may be provided on the outer circumferential wall of the fixing needle 2, and the first clamping plate 31 and the second clamping plate 32 may be partially accommodated in the groove, and movement of the first clamping plate 31 and the second clamping plate 32 in the axial direction of the fixing needle 2 may be restricted by both side walls of the groove in the axial direction of the fixing needle 2. In this state, the first clamp 33 and the second clamp 34 may not be provided.

The method of connecting the fixing needle 2 to the fixing plate 1 will be described below in accordance with the specific structure of the above-described middle clamping device and the fixing needle 2.

The fixing needle 2 passes through the second clamping plate 32, the fixing plate 1 and the first clamping plate 31 in this order.

The second clamp plate 32 is connected to the fixing needle 2, and the second clamp plate 32 is controlled to abut against the second side surface in the thickness direction of the fixing plate 1. Specifically, the second clamping plate 32 and the fixing needle 2 are connected by threaded connection between the second threaded hole 321 of the second clamping plate 32 and the second threaded section of the fixing needle 2, and the second clamping plate 32 is controlled to rotate around the axis of the fixing needle 2 so as to realize the position adjustment of the second clamping plate 32 in the axial direction of the fixing needle 2, thereby controlling the preliminary abutting of the second clamping plate 32 with the second side surface (the lower end surface of the fixing plate 1 in fig. 3) in the thickness direction of the fixing plate 1. The screw structure can restrict the movement of the second clamping plate 32 in the axial direction of the fixing needle 2 without rotating the second clamping plate 32, thereby achieving the preliminary fixing of the second clamping plate 32 on the fixing needle 2.

The first clamping plate 31 and the fixing plate 1 are connected, and the first clamping plate 31 is controlled to abut against the first side surface in the thickness direction of the fixing plate 1. Specifically, the first clamping plate 31 and the fixing needle 2 are connected by threaded connection between the first threaded hole 311 of the first clamping plate 31 and the first threaded section of the fixing needle 2, and the first clamping plate 31 is controlled to rotate around the axis of the fixing needle 2 to realize the position adjustment of the first clamping plate 31 in the axial direction of the fixing needle 2, so that the first clamping plate 31 is controlled to be initially abutted against the first side surface (the upper end surface of the fixing plate 1 in fig. 3) in the thickness direction of the fixing plate 1. The screw structure can restrict the movement of the first clamping plate 31 in the axial direction of the fixed needle 2 without rotating the first clamping plate 31, thereby achieving the preliminary fixation of the first clamping plate 31 on the fixed needle 2.

The sequence of the step of controlling the second clamping plate 32 to abut against the fixing plate 1 and the step of controlling the first clamping plate 31 to abut against the fixing plate 1 is not required.

After the step of controlling the abutment of the second clamping plate 32 with the second side surface in the thickness direction of the fixed plate 1 and controlling the abutment of the first clamping plate 31 with the first side surface in the thickness direction of the fixed plate 1:

The second clamp 34 and the second clamp plate 32 are connected, and the second clamp plate 32 is always held in abutment with the second side surface in the thickness direction of the fixing plate 1 by the second clamp 34. Specifically, the second clamping member 34 is screwed to the second clamping plate 32 by being screwed to the second clamping hole 322 of the second clamping plate 32, and the second clamping member 34 is controlled to be screwed in the direction toward the second side surface in the thickness direction of the fixing plate 1 until the second clamping member 34 is preliminarily abutted to the second side surface in the thickness direction of the fixing plate 1. The second clamping piece 34 is used for keeping the second clamping plate 32 and the fixing plate 1 to be abutted, so that connection looseness of the fixing needle 2 and the fixing plate 1 is avoided, and connection reliability is improved. In this embodiment, through the cooperation between the hole wall of the second threaded hole 321 on the second clamping plate 32 and the fixing needle 2, the rotation of the second clamping plate 32 around the axis of the second clamping hole 322 is limited, and through the cooperation between the hole wall of the second clamping hole 322 on the second clamping plate 32 and the second clamping piece 34, the rotation of the second clamping plate 32 around the axis of the fixing needle 2 is limited, and the position fixation of the second clamping plate 32 is realized under the combined action, so that the second clamping plate 32 can always keep abutting with the fixing plate 1, and the connection stability of the fixing needle 2 and the fixing plate 1 is improved. The second clamping piece 34 is abutted with the fixed plate 1, the rotating difficulty of the second clamping plate 32 is further improved through the friction force between the second clamping piece 34 and the fixed plate 1, the position fixing of the second clamping plate 32 is further ensured, and the connection stability of the fixed needle 2 and the fixed plate 1 is improved.

The first clamp 33 and the first clamp plate 31 are connected, and the first clamp plate 31 is always held in contact with the first side surface in the thickness direction of the fixing plate 1 by the first clamp 33. Specifically, the first clamping member 33 is screwed to the first clamping plate 31 by screwing with the first clamping hole 312 on the first clamping plate 31, and the first clamping member 33 is controlled to be screwed in the direction of the first side face in the thickness direction of the fixing plate 1 until the first clamping member 33 is preliminarily abutted against the first side face in the thickness direction of the fixing plate 1. The first clamping member 33 is used for keeping the first clamping plate 31 and the fixing plate 1 in abutting connection, so as to avoid loose connection between the fixing needle 2 and the fixing plate 1 and improve connection reliability. In this embodiment, through the cooperation between the hole wall of the first threaded hole 311 on the first clamping plate 31 and the fixing needle 2, the rotation of the first clamping plate 31 around the axis of the first clamping hole 312 is limited, and through the cooperation between the hole wall of the first clamping hole 312 on the first clamping plate 31 and the first clamping piece 33, the rotation of the first clamping plate 31 around the axis of the fixing needle 2 is limited, and the position fixing of the first clamping plate 31 is realized under the combined action, so that the first clamping plate 31 can always keep abutting with the fixing plate 1, and the connection stability of the fixing needle 2 and the fixing plate 1 is improved. The first clamping piece 33 is abutted with the fixed plate 1, the rotating difficulty of the first clamping plate 31 is further improved through the friction force between the first clamping piece 33 and the fixed plate 1, the position fixing of the first clamping plate 31 is further guaranteed, and the connection stability of the fixed needle 2 and the fixed plate 1 is improved.

In the present embodiment, the first clamping plate 31 and the second clamping plate 32 are fixed on the fixing needle 2, the fixing plate 1 is sandwiched between the first clamping plate 31 and the second clamping plate 32, the first clamping plate 31 and the second clamping plate 32 are abutted with both side surfaces in the thickness direction of the fixing plate 1 to restrict the movement of the fixing plate 1 in the axial direction of the fixing needle 2, and the friction force between the first clamping plate 31 and the fixing plate 1 and the friction force between the second clamping plate 32 and the fixing plate 1 can further restrict the movement of the fixing plate 1 in the radial direction of the fixing needle 2, thereby realizing the indirect connection between the fixing needle 2 and the fixing plate 1.

In the whole connection process, the fixing needle 2 can not be in direct contact with the fixing plate 1, so that the axis of the fixing needle 2 and the axis of the through hole 11 of the fixing plate 1 do not need to be completely aligned as in the prior art, and the fixing needle 2 can pass through the fixing plate 1 at various angles, thereby reducing the positioning precision requirement of the fixing needle 2 and reducing the connection difficulty of the fixing needle 2 and the fixing plate 1.

Further, after the step of abutting the second clamp 34 against the second side surface in the thickness direction of the fixed plate 1 and abutting the first clamp 33 against the first side surface in the thickness direction of the fixed plate 1:

The screwing of the second clamp 34 toward the second side in the thickness direction of the fixing plate 1 is continuously controlled, and the screwing of the first clamp 33 toward the first side in the thickness direction of the fixing plate 1 is continuously controlled. In this embodiment, the first clamping member 33 and the second clamping member 34 are continuously screwed under the condition that the first clamping plate 31 and the second clamping plate 32 are both preliminarily clamped, so that on one hand, the movement of the fixed plate 1 caused by excessive single-side pressure is prevented, and on the other hand, the friction force between the clamping member and the fixed plate 1 can be increased by continuously screwing the first clamping member 33 and the second clamping member 34, and the rotation of the clamping plate relative to the fixed needle 2 and the clamping member is further limited.

The screwing operation of the first clamping member 33 and the screwing operation of the second clamping member 34 may be alternately performed, for example, the first clamping member 33 is controlled to rotate for several turns relative to the first clamping plate 31, the second clamping member 34 is controlled to rotate for several turns relative to the second clamping plate 32, and then the reciprocating operation is performed, so that the difference of the acting forces of the first clamping member 33 and the second clamping member 34 on the fixing plate 1 is prevented, and the movement of the fixing plate 1 caused by the overlarge single-side pressure is prevented.

After a fixing pin 2 is fixedly connected to the fixing plate 1, the connection of the other fixing pins 2 to the fixing plate 1 can be continued until all fixing pins 2 are fixed to the fixing plate 1.

Example 2

As shown in fig. 11 and 12, the present embodiment discloses an orthopedic external fixation device including the clamping device and fixation needle 2 of embodiment 1. The orthopedic external fixation device is used to post-operatively fix a patient's reduced multi-segment bone 4 to help the patient's bone 4 recover and heal as soon as possible. The fixing needle 2 is inserted into the body of the patient to be connected with the bone 4 of the patient, and the clamping device is arranged outside the patient and fixedly connected with one end of the fixing needle 2 exposed outside the patient so as to realize the position fixing of the fixing needle 2.

As shown in fig. 12, the fixing plate 1 in this embodiment is a flat plate structure, and in other alternative embodiments, the fixing plate 1 may also be partially bent to better adapt to the shape of the bone 4 of the patient, so as to improve the use experience of the patient.

As shown in fig. 12, the fixing needle 2 is further provided with a third external thread segment 23, the third external thread segment 23 is provided at a side of the second external thread segment 22 remote from the first external thread segment 21, the third external thread segment 23 of the fixing needle 2 has an external thread, and the third external thread segment 23 of the fixing needle 2 is inserted into the body of the patient to be connected with the bone 4 of the patient. The threaded connection is highly reliable, preventing the direct connection between the fixation needle 2 and the patient's bone 4 from being easily broken.

Further, the threads of the second external thread section 22 and the threads of the third external thread section 23 in the present embodiment are continuous, so that the man-hours consumed for dividing the second external thread section 22 and the third external thread section 23 on the fixing needle 2 can be saved, and the second clamping plate 32 is larger in the mountable area of the fixing needle 2, improving the fixing flexibility.

In other alternative embodiments, the threads of the second external thread section 22 and the threads of the third external thread section 23 may also be discontinuous, the fixation needle 2 further comprising a second unthreaded section between the second external thread section 22 and the third external thread section 23 to achieve a quick positioning of the second clamping plate 32 relative to the fixation needle 2.

Further, the k-wire in the prior art may be selected as the fixing needle 2, and the specific connection manner between the fixing needle 2 and the bone 4 belongs to the prior art, which is not described herein.

In the whole connection process, the fixing needle 2 can not generate any direct contact with the fixing plate 1, so that the axis of the fixing needle 2 and the axis of the through hole 11 of the fixing plate 1 do not need to be completely aligned like the prior art, the fixing needle 2 can penetrate through the fixing plate 1 at various angles, the fault tolerance is extremely high, the adaptability is extremely high, the positioning precision requirement of the fixing needle 2 is reduced, the operation difficulty of doctors is reduced, and the universality of the external fixing device for orthopaedics is improved. And compared with the external fixation support structure in the prior art, the fixation plate 1 in the embodiment is of an integrated structure, has reliable strength and small volume, and is convenient for the daily life of patients.

Because the length and the diameter of the screw in the external fixed steel plate structure in the prior art are limited due to the material property, unrestricted thickening and lengthening are not possible, otherwise, the screw breakage is easy to occur. The prior art external fixation plate structure is therefore essentially only suitable for the tibia, ankle, etc. to conform to the topography of the bone, and the superficial areas. The fixing needle 2 provided by the application has a plurality of types and high strength, improves the stability of the external fixing device for orthopaedics, can be suitable for fracture conditions of more parts of patients, and further improves the universality of the external fixing device for orthopaedics.

Further, the through hole 11 in this embodiment is a light hole, and the machining precision requirement of the light hole is low, so that the hole can be drilled at any time, the operation difficulty of a doctor is further reduced, and the universality of the external fixing device for orthopedics is improved.

Further, as shown in fig. 11 and 12, the number of the fixation needles 2 in the orthopedic external fixation device in the present embodiment is plural, the plural fixation needles 2 are inserted into the body of the patient to be connected with the multi-segment bone 4 of the patient, and the plural fixation needles 2 are connected with at least two different segments of bone 4 to fix the positions of the different segments of bone 4. The number of the clamping assemblies 3 in the clamping device is also a plurality of, the number of the clamping assemblies 3 is the same as that of the fixed needles 2, the fixed needles 2 are arranged in one-to-one correspondence, and one ends of the fixed needles 2 exposed out of the patient body are connected with the fixed plate 1 through the corresponding clamping assemblies 3. The fixation plate 1 provides support to the patient's multiple segments of bone 4 by being connected to a plurality of fixation pins 2 to ensure that each segment of bone 4 remains in the correct position.

Every fixed needle 2 all realizes being connected with fixed plate 1 through the clamp assembly 3 that corresponds, and the angle real-time adjustment of corresponding fixed needle 2 can be followed to the position of first splint 31 and second splint 32, does not receive the influence of other fixed needles 2, and a plurality of fixed needles 2 can pass fixed plate 1 with different angles, improves the maneuverability that a plurality of fixed needles 2 are connected with same fixed plate 1.

Specifically, as shown in fig. 12, the fixing plate 1 is provided with a plurality of through holes 11, the plurality of through holes 11 are provided at intervals along the length direction of the fixing plate 1 (X direction in fig. 12), the plurality of through holes 11 are all penetrating at both ends in the thickness direction of the fixing plate 1 (Y direction in fig. 12), and the fixing pins 2 pass through the fixing plate 1 in the thickness direction of the fixing plate 1 through the corresponding through holes 11. In this embodiment, the through holes 11, the fixing pins 2 and the clamping assemblies 3 are arranged in a one-to-one correspondence, one through hole 11 is only used for passing through one fixing pin 2, and one clamping assembly 3 is used for fixing one fixing pin 2 on the fixing plate 1.

The number of the first clamping members 33 in the different clamping assemblies 3 may be the same or different, and the number of the second clamping members 34 in the different clamping assemblies 3 may be the same or different.

In the orthopedic external fixation device shown in fig. 12, the axes of the plurality of through holes 11 on the fixation plate 1 are parallel, but in other alternative embodiments, the axes of the plurality of through holes 11 on the fixation plate 1 may not be parallel to each other, or may be a portion of the axes of the through holes 11 are parallel, and the portion of the axes of the through holes 11 are not parallel, specifically, may be adjusted according to the angle at which the fixation needle 2 is fixed on the bone 4.

Further, the size of the fixing plate 1, the number of through holes 11 on the fixing plate 1, and the interval between the adjacent two through holes 11 may be selected according to the condition of the patient.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, are based on the orientation or positional relationship of the devices or components as shown in the drawings, merely to facilitate describing the present utility model and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (10)

1. A clamping device for connecting a fixed needle and a fixed plate comprises a fixed plate and a clamping assembly;

the fixing plate is characterized in that a through hole for a fixing needle to pass through is formed in the fixing plate, and the through hole is communicated with two ends of the fixing plate in the thickness direction;

The clamping assembly comprises a first clamping plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are respectively arranged on two sides of the fixing plate in the thickness direction and are respectively used for being installed on the fixing needle, and the first clamping plate faces one end face of the fixing plate and the second clamping plate faces one end face of the fixing plate and is respectively abutted to the end face of the corresponding side of the fixing plate.

2. The clamping device for securing a needle and a plate connection as recited in claim 1, wherein said clamping assembly further comprises a first clamping member and a second clamping member;

When the first clamping plate is positioned at the first position, one end face of the first clamping plate, which faces the fixed plate, is abutted against the end face of the corresponding side of the fixed plate;

the second clamping piece is connected with the second clamping plate and used for keeping the second clamping plate at a second position, and when the second clamping plate is located at the second position, one end face of the second clamping plate, which faces the fixing plate, is abutted against the end face of the corresponding side of the fixing plate.

3. The clamping device for connecting a fixation needle and a fixation plate as recited in claim 2, wherein said fixation needle passes through said first clamping plate and said second clamping plate, said fixation needle including a first externally threaded section and a second externally threaded section;

The first clamping plate comprises a first threaded hole, the first threaded hole is in threaded connection with the first external threaded section, and the first clamping piece is used for limiting the first clamping plate to rotate around the axis of the first threaded hole;

The second clamping plate comprises a second threaded hole, the second threaded hole is in threaded connection with the second threaded section, and the second clamping piece is used for limiting the second clamping plate to rotate around the axis of the second threaded hole.

4. The clamping device for connecting a fixing needle and a fixing plate according to claim 2, wherein the first clamping plate is provided with a first clamping hole, both ends of the first clamping plate in a thickness direction of the first clamping plate are penetrated, the first clamping hole is provided with an internal thread, the first clamping member is provided with an external thread, the first clamping member is in threaded connection with the first clamping hole, and the first clamping member abuts against the fixing plate;

The second clamping plate is provided with a second clamping hole, the second clamping hole is communicated with two ends of the second clamping plate in the thickness direction, the second clamping hole is provided with internal threads, the second clamping piece is provided with external threads, the second clamping piece is in threaded connection with the second clamping hole, and the second clamping piece is in butt joint with the fixing plate.

5. The clamping device for connecting a fixing needle and a fixing plate according to claim 4, wherein the number of the first clamping holes and the number of the first clamping pieces are the same and are multiple, the first clamping holes are arranged at intervals along the circumferential direction of the first clamping plate, and the first clamping pieces and the first clamping holes are arranged in a one-to-one correspondence;

and/or the second clamping holes and the second clamping pieces are the same in number and are multiple, the second clamping holes are arranged at intervals along the circumferential direction of the second clamping plate, and the second clamping pieces and the second clamping holes are arranged in one-to-one correspondence.

6. The clamping device for attaching a needle to a fixed plate as defined in claim 5, wherein projections of said first clamping plate onto said fixed plate in a thickness direction of said fixed plate are all located on said fixed plate;

And/or the projections of the second clamping plates on the fixed plate along the thickness direction of the fixed plate are all positioned on the fixed plate.

7. Clamping means for securing a needle and a plate connection as claimed in any of claims 1-6, characterized in that the through hole is an optical hole.

8. A fixing needle, characterized in that the fixing needle is fixed by a clamping device for fixing the needle and the fixing plate connection according to any one of claims 1-7.

9. The fixation needle of claim 8, wherein the fixation needle satisfies one or more of the following conditions:

a. The thread of the first external thread section of the fixed needle is continuous with the thread of the second external thread section of the fixed needle, or the fixed needle also comprises a first unthreaded section which is positioned between the first external thread section of the fixed needle and the second external thread section of the fixed needle;

b. The fixing needle further comprises a third external thread section, and the third external thread section is arranged on one side of the second external thread section of the fixing needle, which is far away from the second external thread section of the fixing needle;

The threads of the second external thread section and the threads of the third external thread section are continuous, or the fixing needle further comprises a second unthreaded section positioned between the second external thread section and the third external thread section.

10. An orthopaedic external fixation device comprising a clamping device for attachment of a fixation needle to a fixation plate as claimed in any one of claims 1 to 7 and a fixation needle as claimed in claim 8 or 9, the fixation needle passing through the through hole in the fixation plate.