CN211325486U

CN211325486U - Fixing device

Info

Publication number: CN211325486U
Application number: CN201922386888.8U
Authority: CN
Inventors: 廖翚; 周鹏飞
Original assignee: Tianjin Walkman Biomaterial Co ltd
Current assignee: Tianjin Walkman Biomaterial Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-08-25
Anticipated expiration: 2029-12-26

Abstract

The utility model relates to a fixing device, fixing device includes: the connecting rod, the fixed block and the locking screw; the connecting rod includes in order: the first rod body, the second rod body and the third rod body; the first rod body, the second rod body and the third rod body are integrally arranged; the fixed block includes: the single-rod fixing block and the double-rod fixing block; the single-rod fixing block comprises a first upper edge part, a first lower edge part and a first connecting rod through hole; the single-rod fixing block is inserted into the second rod body of the connecting rod by utilizing a through hole of the first connecting rod; the double-rod fixing block comprises a second upper edge part, a second lower edge part and two second connecting rod through holes; the double-rod fixing block is inserted into the second rod body of the connecting rod by utilizing the through holes of the two second connecting rods; the locking screw includes: a screw cap, an upper screw joint part, a lower screw joint part and a nail head; go up the spiro union portion and be connected with the screw cap, lower spiro union portion is connected with last spiro union portion, and the pin fin is connected with lower spiro union portion.

Description

Fixing device

Technical Field

The utility model relates to an orthopedics medical instrument field especially relates to a fixing device.

Background

Fracture is a common clinical disease, and reduction and fixation of fracture are difficult, so that the injury rate is high. The treatment aiming at the fracture is the first choice at present by surgical treatment.

At present, the orthopedic treatment of fracture adopts the main means of internal fixation of implants, the implants are mainly bone fracture plates, the bone fracture plates are provided with hole sites, and the fracture parts are reinforced through screws, thereby realizing the purpose of treating fracture. When the existing bone fracture plate product is used for curing fracture, infection, inaccurate bone alignment and long fracture part healing time are easily caused; the screw can fall off or be pulled out and broken under the action of stress. The bone fracture plate is fixed at the tension side, so that stress shielding is easy to occur, fatigue fracture is generated, and the internal implant is failed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fixing device adopts nail, stick and block combination to be applied to the fracture position of positions such as four limbs and pelvis fixed, and the device accords with biology and biomechanics' requirement, and the range of application is wide, effectively avoid taking off the stick, the screw scheduling problem that drops, possesses good operability and practicality and promotes the security of operation.

In order to achieve the above object, the present invention provides a fixing device, which comprises: the connecting rod, the fixed block and the locking screw;

the connecting rod includes in order: the first rod body, the second rod body and the third rod body; the first rod body, the second rod body and the third rod body are integrally arranged;

the first rod body of the connecting rod is inserted into the special-shaped block;

the fixed block includes: the single-rod fixing block and the double-rod fixing block;

the single-rod fixing block comprises a first upper edge part, a first lower edge part and a first connecting rod through hole;

the first upper edge part is positioned at the upper end of the single-rod fixing block and comprises a first upper fixing threaded hole, and the hole wall of the first upper fixing threaded hole is a smooth curved surface;

the first lower edge part is positioned at the lower end of the single-rod fixing block and comprises a first lower fixing threaded hole, a fastening thread is arranged on the hole wall of the first lower fixing threaded hole, and the hole diameter of the first lower fixing threaded hole is smaller than that of the first upper fixing threaded hole;

the first connecting rod through hole is positioned between the first upper edge part and the first lower edge part of the single-rod fixing block;

the single-rod fixing block is inserted into the second rod body of the connecting rod by utilizing a through hole of the first connecting rod;

when the connecting rod is inserted into the first connecting rod through hole, the locking screw penetrates through the first upper fixing threaded hole and the first lower fixing threaded hole, the locking screw abuts against the first upper fixing threaded hole, and the locking screw is in threaded connection with the first lower fixing threaded hole, so that the locking screw extrudes the first upper edge part and the first lower edge part, and the connecting rod is tightly fixed in the first connecting rod through hole of the single-rod fixing block;

the double-rod fixing block comprises a second upper edge part, a second lower edge part and two second connecting rod through holes;

the second upper edge part is positioned at the upper end of the double-rod fixing block and comprises a second upper fixing threaded hole, and the hole wall of the second upper fixing threaded hole is a smooth curved surface;

the second lower edge part is positioned at the lower end of the double-rod fixing block and comprises a second lower fixing threaded hole, a fastening thread is arranged on the hole wall of the second lower fixing threaded hole, and the aperture of the second lower fixing threaded hole is smaller than that of the second upper fixing threaded hole;

the second connecting rod through holes are positioned on the side surfaces of the double-rod fixing blocks, and the two second connecting rod through holes are symmetrically arranged on two sides of the second upper fixing threaded hole and the second lower fixing threaded hole;

the double-rod fixing block is inserted into the second rod body of the connecting rod by utilizing two second connecting rod through holes;

when the connecting rods are respectively inserted into the two second connecting rod through holes, the locking screws penetrate through the second upper fixing threaded hole and the second lower fixing threaded hole, the locking screws abut against the second upper fixing threaded hole, and the locking screws are in threaded connection with the second lower fixing threaded hole, so that the locking screws extrude the second upper edge part and the second lower edge part, and the connecting rods are tightly fixed in the two second connecting rod through holes of the double-rod fixing block;

the locking screw includes: a screw cap, an upper screw joint part, a lower screw joint part and a nail head; the upper screw joint part is connected with the screw cap, the lower screw joint part is connected with the upper screw joint part, and the nail head is connected with the lower screw joint part;

the upper surface of the screw cap is provided with a quincunx or other mounting hole, and the lower surface of the screw cap is provided with an indent;

the upper thread-connecting part has a double thread;

the lower threaded part is provided with a single thread, and the diameter of the lower threaded part is smaller than that of the upper threaded part;

the nail head has more than one self-tapping blade

When the screw cap is used, the self-tapping blade of the nail head is driven to cut a bone under the driving of the screw cap, and the lower screwing part is driven to cut into the bone by using a single thread; the upper screw joint part penetrates through the upper edge part of the fixed block and is screwed into the lower edge part of the fixed block by double threads, the screw cap abuts against the upper edge part of the fixed block, and the upper edge part and the lower edge part of the fixed block are tightly meshed with each other along with the screwing of the upper screw joint part and the lower edge part of the fixed block, so that the upper edge and the lower edge are meshed and fixed with a connecting rod inserted between the upper edge and the lower edge.

Preferably, the connecting rod further comprises a groove;

the grooves are arranged on the surface of the connecting rod at equal intervals, the interval between every two adjacent grooves is 0.35-0.4 mm, and the distance between the center lines of the two adjacent grooves is 1.14-1.57 mm;

the inner side of the groove is an arc-shaped curved surface, and the curvature radius range of the arc-shaped curved surface is 2.5 mm-3.5 mm.

Further preferably, a protrusion is arranged between the grooves, and a plurality of protrusions arranged at equal intervals are arranged on the surface of the connecting rod.

Preferably, the single rod fixing block further comprises: a first side opening;

the first side opening is arranged between the first upper fixed screw hole and the first lower fixed screw hole.

Preferably, the single rod fixing block further comprises: a first cross-hole;

the first cross hole is positioned in the first upper fixed screwed connection hole, is formed by the cross position of the first connecting rod through hole and the first upper fixed screwed connection hole, and is used for extruding and fixing the connecting rod.

Preferably, the double-rod fixing block further comprises: a second side opening;

the opening on the second side is opened in the inside of double-rod fixing block, is located between fixed spiro union hole and the second lower fixed spiro union hole on the second, with two second connecting rod through-hole intercommunication.

Preferably, the double-rod fixing block further comprises: a second cross-hole;

the second cross hole is positioned in the second upper fixed screwed connection hole, is formed by the cross position of the second connecting rod through hole and the second upper fixed screwed connection hole, and is used for extruding and fixing the connection.

Preferably, the lower surface of the screw cap is of a spherical structure, the sphere is matched with the upper edge part of the fixing block, and the diameter of the sphere is 2-5 mm.

Preferably, the single thread is a cortical bone thread.

Preferably, the cross-section and the longitudinal section of the self-tapping blade are both arc-shaped.

The embodiment of the utility model provides a pair of fixing device adopts nail, stick and piece combination range of application extensive, and the equipment is simple and convenient, fixed nimble, accord with biology and biomechanics' requirement to promote operability and practicality, effectively avoid taking off stick, screw drop, fixed more firm, alleviate the secondary injury to the patient, thereby promote the security of operation.

Drawings

Fig. 1 is a schematic view of an overall structure of a fixing device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a connecting rod in the fixing device according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a single-rod fixing block in the fixing device according to the embodiment of the present invention;

fig. 4 is a schematic structural view of a double-rod fixing block in the fixing device according to the embodiment of the present invention;

fig. 5 is a schematic structural view of a locking screw in the fixing device according to an embodiment of the present invention;

FIG. 6 is a partial enlarged view of the portion C in FIG. 2;

FIG. 7 is a cross-sectional view taken along line D-D of FIG. 3;

FIG. 8 is a cross-sectional view of section E-E of FIG. 4;

fig. 9 is a top view of a locking screw in a fixation device according to an embodiment of the present invention;

fig. 10 is a bottom view of a locking screw of the fixing device according to an embodiment of the present invention;

fig. 11 is a schematic overall structure diagram of another fixing device according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the two components may be mechanically connected, directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Fig. 1 is an overall schematic structural diagram of a fixing device provided in an embodiment of the present invention, fig. 2 is a schematic structural diagram of a connecting rod in a fixing device provided in an embodiment of the present invention, fig. 3 is a schematic structural diagram of a single rod fixing block in a fixing device provided in an embodiment of the present invention, fig. 4 is a schematic structural diagram of a double rod fixing block in a fixing device provided in an embodiment of the present invention, fig. 5 is a schematic structural diagram of a locking screw in a fixing device provided in an embodiment of the present invention, fig. 7 is a sectional view of a portion D-D in fig. 3, and fig. 8 is a sectional view of a portion E-E in fig. 4; with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 7 and fig. 8, an embodiment of the present invention provides a fixing device, which includes: connecting rod 2, fixed block 3 and locking screw 1.

Specifically, the connecting rod 2 sequentially comprises a first rod body 21, a second rod body 22 and a third rod body 23; connecting rod 2 is used for pegging graft respectively and goes into in dysmorphism is fast with end fixed block and fixed block 3, realize that the fixed more firm and counterpoint of fracture position skeleton is more accurate, first body of rod 21, second body of rod 22 and third body of rod 23 set up as an organic whole, the both ends of connecting rod 2 are smooth and flat button head, can realize connecting rod 2's both ends and the complete connection of the connecting rod connecting hole of dysmorphism piece or end fixed block, connecting rod 2 adopts titanium alloy or stainless steel to make, good elasticity has, corrosion resistance and intensity, titanium alloy material ensures that connecting rod 2 has better rigidity and bending resistance can guarantee to the requirement of fracture position reinforced firmness nature in the fracture operation treatment, good operability and practicality are possessed.

The first rod body 21 is located at the top of the connecting rod 2, and the first rod body 21 of the connecting rod 2 is inserted into the special-shaped block and used for connecting one end of the connecting rod 2 with the special-shaped block.

In one embodiment, the first rod 21 is clamped inside the shaped block, the shaped block has a first upper edge and a first lower edge, and the first rod 21 is clamped between the first upper edge and the first lower edge; when the locking screw 1 is threaded into the first upper edge and then screwed into the first lower edge, the screw cap of the locking screw 1 abuts against the first upper edge, and the first upper edge and the first lower edge are tightly engaged with the first rod body 21 along with the screwing of the locking screw 1 into the first lower edge, so that the first rod body 21 is engaged and fixed on the special-shaped block.

The second rod body 22 is located in the middle of the connecting rod 2, and the second rod body 22 of the connecting rod 2 is inserted into the fixing block 3 and used for firmly fixing the connecting rod 2 and the bone of the fracture part.

In one embodiment, the second rod 22 is inserted between the upper edge portion and the lower edge portion of the fixed block 3; when the locking screw 1 is threaded into the lower edge portion after penetrating through the upper edge portion, the screw cap of the locking screw 1 abuts against the upper edge portion, and the upper edge portion and the lower edge portion are tightly engaged with the second rod body 22 along with the screwing of the locking screw 1 into the lower edge portion, so that the fixing block 3 is fixedly engaged with the second rod body 22.

The third body of rod 23 is located the bottom of connecting rod 2, and the end fixed block is gone into in the grafting of the third body of rod 23 for the other end and the end fixed block realization of connecting rod 2 are connected.

In one embodiment, the third rod 23 is clamped inside the end fixing block, the end fixing block has a second upper edge and a second lower edge, and the third rod 23 is clamped between the second upper edge and the second lower edge; when the locking screw 1 penetrates through the second upper edge and is screwed into the second lower edge, the screw cap of the locking screw 1 abuts against the second upper edge, and the locking screw 1 is screwed with the second lower edge to further enable the second upper edge and the second lower edge to be tightly occluded with the third rod body 23, so that the end fixing block is occluded and fixed on the third rod body 23.

Fig. 6 is a partial enlarged view of a part C in fig. 2, and as shown in fig. 2 and fig. 6, the connecting rod 2 further includes grooves 24 and protrusions 25, the grooves 24 are arranged on the surface of the connecting rod 2 at equal intervals, the inner sides of the grooves 24 are arc-shaped curved surfaces, the curvature radius range of the arc-shaped curved surfaces is 2.5mm to 3.5mm, the grooves 24 are used for increasing the friction force between the surface of the connecting rod 2 and the fixed block 3, so as to effectively avoid the occurrence of the rod-falling phenomenon of the fixed block 3 in the operation process, the interval B between two adjacent grooves 24 is 0.35 mm to 0.4mm, and the distance a between the center lines of two adjacent grooves is 1.14 mm to 1.57 mm; have protruding 25 between two adjacent recesses 24, the surface of connecting rod 2 is provided with a plurality of equally spaced arrangement's protruding 25, protruding 25 is used for cooperating with the screw cap part of locking screw 1, realize the effect of locking screw 1 extrusion and fixed connection pole 2, wherein, recess 24 and protruding 25 range in turn on the surface of connecting rod 2, on the one hand, the doctor of being convenient for in the operation process wears rubber gloves and conveniently picks the body of rod and carry out operations such as corresponding rotation or position control, on the other hand, can restrict fixed block 3 and freely slide and carry out accurate location on the body of rod, avoid appearing the fixed position and take place the secondary injury that the skew led to the fact the skeleton.

The fixing block 3 comprises a single-rod fixing block 31 and a double-rod fixing block 32, and the fixing block 3 is inserted into the connecting rod 2 and used for being matched with the locking screw 1 to fix the bone of the fracture part.

Fig. 7 is a cross-sectional view of a portion D-D in fig. 3, and in conjunction with fig. 3 and 7, the single rod fixing block 31 is a semi-closed structure, and the single rod fixing block 31 specifically includes a first upper edge portion 310, a first lower edge portion 311, a first side opening 312, and a first connecting rod through hole 313; the first upper edge portion 310 and the first lower edge portion 311 are oppositely arranged, a first side opening 312 is formed between the first upper edge portion 310 and the first lower edge portion 311, the first connecting rod through hole 313 is communicated with the first side opening 312, and the first side opening 312 separates the first upper edge portion 310 and the first lower edge portion 311, so that the single rod fixing block 31 is in a semi-closed state.

The first upper edge portion 310 is located at the upper end of the single-rod fixing block 31, the first upper edge portion 310 includes a first upper fixing screw hole 3101, and the hole wall of the first upper fixing screw hole 3101 is a smooth curved surface for abutting against the screw cap of the locking screw 1.

The first lower edge part 311 is located at the lower end of the single-rod fixing block 31, the first lower edge part 311 includes a first lower fixing screw hole 3111, and the hole wall of the first lower fixing screw hole 3111 is provided with a fastening thread for screw-connecting with the upper screw-connecting part of the locking screw 1; the first upper fixed screw hole 3101 is opposite to the first lower fixed screw hole 3111, and the first lower fixed screw hole 3111 has a smaller diameter than the first upper fixed screw hole 3101.

The first side opening 312 is opened between the first upper fastening screw hole 3101 and the first lower fastening screw hole 3111, and further the first side opening 312 is communicated with the first connecting rod through hole 313, so that the first upper edge portion 310 and the first lower edge portion 311 are in a separated state, and the first side opening 312 is used for adjusting the distance between the first upper edge portion 310 and the first lower edge portion 311, so that the single rod fixing block 31 can slide on the connecting rod 2 and perform accurate positioning, and specifically, the single rod fixing block 31 presses the first upper edge portion 310 and the first lower edge portion 311 through the locking screw 1, so as to adjust the opening size of the first side opening 312 and press the connecting rod 2.

The first connecting rod through hole 313 is arranged on the side surface of the single rod fixing block 31, specifically between the first upper edge part 310 and the first lower edge part 311, the aperture of the first connecting rod through hole 313 is matched with the diameter of the connecting rod 2, and the first connecting rod through hole 313 is used for being matched with the locking screw 1 to lock and fix the connecting rod 2 in the single rod fixing block 31.

In addition, the single stick fixing block 31 further includes a first cross hole 314, the first cross hole 314 is formed in the first upper fixing screw hole 3101 by the intersection of the first connecting rod through hole 313 and the first upper fixing screw hole 3101, and the first cross hole 314 serves to press and fix the connecting rod 2.

The single rod fixing block 31 is inserted into the second rod body 22 of the connecting rod 2 by using a first connecting rod through hole 313, so that the single rod fixing block 31 can rotate around the connecting rod 2 by any angle through the first connecting rod through hole 313 for adjusting the implantation direction of the locking screw 1.

In one embodiment, when the connection rod 2 is inserted into the first connection rod through hole 313, and the locking screw 1 is inserted through the first upper fixing threaded hole 3101 and the first lower fixing threaded hole 3111, the screw cap of the locking screw 1 abuts against the first upper fixing threaded hole 3101, and the upper threaded part of the locking screw 1 is screwed with the first lower fixing threaded hole 3111, so that the locking screw 1 presses the first upper edge portion 310 and the first lower edge portion 311, thereby tightly fixing the second rod 22 of the connection rod 2 in the first connection rod through hole 313 of the single-rod fixing block 31.

Fig. 8 is a cross-sectional view of a portion E-E in fig. 4, and referring to fig. 4 and 8, the dual rod fixing block 32 is a fully closed structure, and the dual rod fixing block 32 specifically includes a second upper edge portion 320, a second lower edge portion 321, a second side opening 322, and two second connecting rod through holes 323; the second upper edge portion 320 and the second lower edge portion 321 are disposed opposite to each other, the second side opening 322 is opened inside the dual rod fixing block 32, the two second connecting rod through holes 323 are respectively communicated with the second side opening 322, and the second side opening 322 separates the second upper edge portion 320 and the second lower edge portion 321 inside the dual rod fixing block 32.

The second upper edge 320 is located at the upper end of the dual rod fixing block 32, the second upper edge 320 includes a second upper fixing screw hole 3201, and a hole wall of the second upper fixing screw hole 3201 is a smooth curved surface for abutting against a screw cap of the locking screw 1.

The second lower edge portion 321 is located at the lower end of the double-rod fixing block 32, the second lower edge portion 321 includes a second lower fixing screw hole 3211, and the hole wall of the second lower fixing screw hole 3211 is provided with a fastening thread for screwing with an upper screw part of the locking screw 1; the second upper fixing screw hole 3201 is opposite to the second lower fixing screw hole 3211, and an aperture of the second lower fixing screw hole 3211 is smaller than an aperture of the second upper fixing screw hole 3201.

The second side opening 322 is opened inside the dual rod fixing block 32, and is located between the second upper fixing screw hole 3201 and the second lower fixing screw hole 3211, and further the second side opening 322 is respectively communicated with the two second connecting rod through holes 323, so that the second upper edge part 320 and the second lower edge part 321 located inside the dual rod fixing block 32 are in a separated state, the second side opening 322 is used for adjusting the distance between the second upper edge part 320 and the second lower edge part 321, so that the dual rod fixing block 32 is firmly fixed on the connecting rod 2 while pressing the connecting rod 2, specifically, the dual rod fixing block 32 presses the second upper edge part 320 and the second lower edge part 321 through the locking screw 1, so as to adjust the distance between the second upper edge part 320 and the second lower edge part 321 and respectively press the two connecting rods 2.

Two second connecting rod through holes 323 are arranged on the side surface of the double-rod fixing block 32, one of the second connecting rod through holes 323 is positioned on one side of the connecting part of the second upper edge part 320 and the second lower edge part 321, the other one of the second connecting rod through holes is positioned on the other side of the connecting part of the second upper edge part 320 and the second lower edge part 321, the aperture of the second connecting rod through hole 323 is matched with the diameter of the connecting rod 2, and the second connecting rod through hole 323 is used for being matched with the locking screw 1 to lock and fix the connecting rod 2 in.

In addition, the dual rod fixing block 32 further includes two second cross holes 324, the second cross holes 324 are located in the second upper fixing screw holes 3201, the two second cross holes 324 are symmetrically formed by the intersections of the second connecting rod through holes 323 and the second upper fixing screw holes 3201, and the second cross holes 324 are used for pressing and fixing the connecting rods 2.

The double-rod fixing block 32 is inserted into the second rod body 22 of the connecting rod 2 by using the two second connecting rod through holes 323, so that the double-rod fixing block 32 can stably move on the connecting rod 2 through the two second connecting rod through holes 323 without the phenomenon that the fixing block 3 rotates around the connecting rod 2.

In an embodiment, when the connecting rods 2 are inserted into the two second connecting rod through holes 323, respectively, and the locking screws 1 are inserted through the second upper fixing threaded holes 3201 and the second lower fixing threaded holes 3211, the screw caps of the locking screws 1 abut against the second upper fixing threaded holes 3201, and the upper threaded portions of the locking screws are in threaded connection with the second lower fixing threaded holes 3211, so that the locking screws 1 press the second upper edge portion 320 and the second lower edge portion 321, thereby tightly fixing the connecting rods 2 in the two second connecting rod through holes 323 of the dual rod fixing block 32.

The locking screw 1 sequentially comprises a screw cap 11, an upper screw joint part 12, a lower screw joint part 13 and a nail head 14; the locking screw 1 is used for penetrating through the fixing block 3 and implanting into a bone at a fracture part to realize that the bone at the fracture part is tightly fixed on the connecting rod 2; the screw cap 11, the upper screw joint part 12, the lower screw joint part 13 and the nail head 14 are of an integrally formed structure, the upper screw joint part 12 is connected with the screw cap 11, the lower screw joint part 13 is connected with the upper screw joint part 12, and the nail head 14 is connected with the lower screw joint part 13; the upper surface and the lower surface of the screw cap 11 adopt smooth curved surface design and have no screw thread, so that the screw cap 11 and the upper fixing screw hole on the surface of the fixing block 3 are completely propped against each other, the surfaces of the upper screw part 12 and the lower screw part 13 adopt double-line or single-line thread design, so that the locking screw 1 is screwed with bones through screw threads, the screw head 14 adopts self-tapping blade design, the bones are quickly cut through the self-tapping blade, and the locking screw 1 is quickly implanted into the bones.

The upper surface of the screw cap 11 has a quincunx or other mounting hole 110, and the upper surface mounting hole of the screw cap 11 is designed in a quincunx manner for the following reasons: on one hand, a special tool is provided to ensure that the whole stress of the locking screw 1 is balanced in the process of implanting the locking screw 1 into the bone, so that the problems of rod body fracture or screw cap 11 damage caused by uneven stress are avoided; on the other hand, the quincunx mounting hole 110 can transmit larger and more stable torque compared with a common hexagonal socket, and simultaneously effectively avoids the phenomenon of slipping in the process of screwing the screw cap 11; the lower surface of screw cap 11 is spherical structure and has the indent, and spherical structure and the last fixed spiro union hole phase-match of fixed block 3, spherical diameter are 2 ~ 5 mm.

In one embodiment, when the quincunx mounting hole 110 on the upper surface of the screw cap 11 is screwed by using a special tool so that the locking screw 1 passes through the first upper fixing screw hole 3101 and the first lower fixing screw hole 3111 of the single rod fixing block 31, the lower screw part 13 and the nail head 14 of the locking screw 1 sequentially pass through the first lower fixing screw hole 3111 and are implanted into the bone, the upper screw part 12 of the locking screw 1 is screwed into the first lower fixing screw hole 3111, the screw cap 11 of the locking screw 1 abuts against the first upper fixing screw hole 3101, and the range of the screw cap 11 screwed deep into the upper screw part 12 of the locking screw 1 and the first upper fixing screw hole 3101 gradually increases, so that the screw cap 11 is completely fitted and accommodated in the first upper fixing screw hole 3101 of the single rod fixing block 31.

In another embodiment, after the locking screw 1 is screwed through the second upper fixing screw hole 3201 and the second lower fixing screw hole 3211 of the dual rod fixing block 32 by using a special tool, the lower screw part 13 and the nail head 14 of the locking screw 1 sequentially pass through the second upper fixing screw hole 3201 and are implanted into the bone, the upper screw part 12 of the locking screw 1 is screwed into the second lower fixing screw hole 3211, the screw cap 11 of the locking screw 1 abuts against the second upper fixing screw hole 3201, and as the screwing range of the upper screw part 12 of the locking screw 1 screwed into the screw cap 11 and the second upper fixing screw hole 3201 gradually increases, the screw cap 11 is completely fitted and accommodated in the second upper fixing screw hole 3201 of the dual rod fixing block 32.

The upper screw-connection portion 12 is connected with the screw cap 11, the upper screw-connection portion 12 is designed to have a double thread, and the double thread of the upper screw-connection portion 12 is screwed with the thread of the lower fixing screw-connection hole of the fixing block 3 to prevent the locking screw 1 from falling off or being pulled out from the fixing block 3.

In one embodiment, after the locking screw 1 is inserted through the first upper fixing threaded hole 3101 and the first lower fixing threaded hole 3111 of the single rod fixing block 31, the lower threaded portion 13 and the head 14 of the locking screw 1 sequentially pass through the first lower fixing threaded hole 3111 and then are implanted into the bone, the upper threaded portion 12 of the locking screw 1 is threaded into the first lower fixing threaded hole 3111, and the upper threaded portion 12 of the locking screw 1 is fully threaded into the first lower fixing threaded hole 3111 along with the full abutment of the nut 11 of the locking screw 1 and the first upper fixing threaded hole 3101, so that the upper threaded portion 12 is fully threaded into the first lower fixing threaded hole 3111 of the single rod fixing block 31.

In another embodiment, after the locking screw 1 passes through the second upper fixing threaded hole 3201 and the second lower fixing threaded hole 3211 of the dual rod fixing block 32, the lower threaded portion 13 and the head 14 of the locking screw 1 sequentially pass through the second lower fixing threaded hole 3211 and then are implanted into the bone, the upper threaded portion 12 of the locking screw 1 is threadedly engaged with the threads in the second lower fixing threaded hole 3211, and the upper threaded portion 12 of the locking screw 1 is completely threadedly engaged with the second lower fixing threaded hole 3211 along with the complete abutment of the nut 11 of the locking screw 1 and the second upper fixing threaded hole 3201, so that the upper threaded portion 12 is completely threadedly engaged with the second lower fixing threaded hole 3211 of the dual rod fixing block 32.

The lower screw joint part 13 is connected with the upper screw joint part 12, the lower screw joint part adopts a single-thread design, the single-thread of the lower screw joint part 13 is used for being connected with bones, the holding force and the fixing effect are enhanced, and the diameter of the lower screw joint part 13 is smaller than that of the upper screw joint part 12.

In particular, the single thread is a cortical bone thread for implantation into bone.

The nail head 14 is connected with the lower screw-connection part 13, the nail head 14 is provided with more than one self-tapping blade 141, the cross section and the longitudinal section of the self-tapping blade 141 are arc-shaped, and the self-tapping blade 141 is used for rapidly cutting the bone and implanting the lower screw-connection part 13 of the locking screw 1 into the fracture part accurately

In one embodiment, after the locking screw 1 is inserted through the first upper fixing screw hole 3101 and the first lower fixing screw hole 3111 of the single-rod fixing block 31, the self-tapping blade 141 of the nail head 14 is driven by the nut 11 of the locking screw 1 to cut the bone, and the lower screw part 13 of the locking screw 1 is driven to be screwed into the bone by a single thread; the upper screw-coupling portion 12 is inserted into the first lower edge portion 311 of the single-rod fixing block 31 by means of a double-thread screw after passing through the first upper edge portion 310 of the single-rod fixing block 31, and the nut 11 of the locking screw 1 abuts against the first upper edge portion 310 of the single-rod fixing block 31, so that the first upper edge portion 310 and the first lower edge portion 311 of the single-rod fixing block 31 are engaged and fastened together with the further screwing of the upper screw-coupling portion 12 into the first lower edge portion 311 of the single-rod fixing block 31, and the first upper edge portion 310 and the first lower edge portion 311 are engaged and fixed with the connecting rod 2 inserted between the first upper edge portion 310 and the first lower edge portion 311.

The process of inserting the locking screw 1 through the fixing screw hole of the double rod fixing block 32 and cutting the bone is the same as the above-mentioned process, and will not be repeated.

The above description has been made on the components of the fixing device and the connection relationship between them according to the embodiment of the present invention, and the following description will be made on the use of the fixing device with reference to fig. 1 to 5, 7, 8 and 11:

example 1

Doctors use the fixing device for combined assembly aiming at different types of fractures in fracture surgery. The process of using the combination will be described in detail below by taking the connecting rod 2, the single-rod fixing block 31, the double-rod fixing block 32 and the locking screw 1 as an example.

Aligning the first rod bodies 21 of the two connecting rods 2 with the two second connecting rod through holes 323 of the two rod fixing blocks 32 respectively, inserting the first rod bodies 21 into the two rod fixing blocks 32 along the opening direction of the holes, aligning the first connecting rod through hole 313 of the single rod fixing block 31 with one connecting rod 2 and inserting the first connecting rod through hole 313 of the single rod fixing block 31 into the connecting rod 2, adding one or more single rod fixing blocks 31 and/or two rod fixing blocks 32 according to the needs in the operation, the specific steps are the same as the steps, so that the single rod fixing block 31 and/or the two rod fixing blocks 32 can slide along the part of the second rod bodies 22, and through the grooves 24 and the protrusions 25 alternately arranged on the surfaces of the connecting rods 2, a doctor can accurately control the sliding distance of the single rod fixing block 31 and/or the two rod fixing blocks 32 on the two connecting rods 2, so that the single rod fixing block 31 and/or the two rod fixing blocks 32 can slide to any preset position on, the double-rod fixing blocks 32 are inserted into the two connecting rods 2 according to the same procedure, so far, the pre-assembly of the fixing device is realized, and for the pre-assembled fixing device, locking nuts are required to be arranged in the double-rod fixing blocks 32 at the two ends, and the locking nuts can improve the overall firmness of the pre-assembled device, so that the fixing device can be kept as a whole. And then moving the whole fixing device to the surface of a bone at the fracture position, marking the position of an implanted screw in advance according to the fracture condition, sliding the single-rod fixing block 31 and/or the double-rod fixing block 32 at the middle part to the marked screw position, assembling the single-rod fixing block and/or the double-rod fixing block with special-shaped blocks at two sides of the fracture position, and screwing the locking screws 1 in sequence to fix the fixing device on the bone after assembling. Specifically, after the locking screw 1 is inserted through the second upper fixing threaded hole 3201 and the second lower fixing threaded hole 3211 of the dual-rod fixing block 32, a special tool is used to screw the quincunx mounting hole on the upper surface of the screw cap 11, the screw head 14 drives the tapping blade 141 to cut the bone under the driving of the screw cap 11, and drives the lower threaded part 13 to be screwed into the bone at the fracture site by using a single thread, meanwhile, the upper threaded part 12 is inserted through the second upper fixing threaded hole 3201 and then enters the second lower fixing threaded hole 3211, the double threads of the upper threaded part 12 are screwed with the fastening threads in the second lower fixing threaded hole 3211, the screw cap 11 abuts against the second upper fixing threaded hole 3201, the second side opening 322 of the dual-rod fixing block 32 is further pressed downwards along with the screw cap 11, until the screw cap 11 completely abuts against the second upper fixing threaded hole 3201, and the gap of the second side opening 322 changes, meanwhile, the dent on the lower surface of the screw cap 11 presses and fixes the connecting rod 2 through the symmetrically arranged second cross holes 324, so that the locking screw 1 realizes complete occlusion fixation with the double-rod fixing block 32 and the connecting rod 2. The locking screws 1 are inserted into the single-rod fixing block 31 located in the middle of the fixing device and the double-rod fixing blocks 32 located at the two ends of the fixing device in sequence according to the same steps and are fixed.

It should be noted that, in the above embodiment, when the double-rod fixing blocks 32 at the two ends of the fixing device are fixed, the locking nuts that are previously placed in the double-rod fixing blocks are removed and fixed by using the locking screws 1.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixation device, comprising: the connecting rod, the fixed block and the locking screw;

the first rod body of the connecting rod is inserted into the special-shaped block; the fixed block includes: the single-rod fixing block and the double-rod fixing block;

the upper thread-connecting part has a double thread;

the nail head has more than one self-tapping blade

When the screw cap is used, the self-tapping blade of the nail head is driven to cut a bone under the driving of the screw cap, and the lower screwing part is driven to cut into the bone by using a single thread; the upper screw joint part penetrates through the upper edge part of the fixed block and is screwed into the lower edge part of the fixed block by double threads, the screw cap abuts against the upper edge part of the fixed block, and the upper edge part and the lower edge part of the fixed block are tightly meshed with each other along with the screwing of the upper screw joint part and the lower edge part of the fixed block, so that the upper edge part and the lower edge part are fixedly meshed with a connecting rod inserted between the upper edge part and the lower edge part.

2. The fixation device of claim 1, wherein the connecting rod further comprises a groove;

3. A fastening device according to claim 2, wherein the recesses have projections therebetween, and the surface of the connecting rod is provided with a plurality of said projections arranged at equal intervals.

4. The fixture according to claim 1, wherein the single rod fixture block further comprises: a first side opening;

5. The fixture according to claim 1, wherein the single rod fixture block further comprises: a first cross-hole;

6. The fixture of claim 1, wherein the dual bar fixture block further comprises: a second side opening;

7. The fixture of claim 1, wherein the dual bar fixture block further comprises: a second cross-hole;

the second cross hole is positioned in the second upper fixed screwed connection hole, is formed by the cross position of the second connecting rod through hole and the second upper fixed screwed connection hole, and is used for extruding and fixing the connecting rod.

8. The fixing device according to claim 1, wherein the lower surface of the screw cap has a spherical structure, the spherical structure is matched with the upper edge part of the fixing block, and the diameter of the spherical structure is 2-5 mm.

9. The fixation device of claim 1, wherein the single thread is a cortical bone thread.

10. The fixture according to claim 1, wherein the cross-section and the longitudinal section of the tapping blade are arc-shaped.