CN217488799U - A connecting rod locking device and external fixing bracket - Google Patents

Abstract

The utility model provides a connecting rod locking device and external fixation support, this connecting rod locking device include base, bulb screw rod to and the last clamp splice and the lower clamp splice of mutually supporting. The upper clamping block and the lower clamping block are used for clamping a connecting rod, the base is provided with a first connecting portion and a second connecting portion, the first connecting portion is used for being connected with the bone screw locking device, the second connecting portion is used for being connected with the lower clamping block in a spherical hinge mode, and the ball head screw rod sequentially penetrates through the second connecting portion, the lower clamping block and the upper clamping block and is connected with the tightening nut. The utility model provides a connecting rod locking device can provide installation angle for the connecting rod better, is favorable to reducing the operation degree of difficulty.

Description

A connecting rod locking device and external fixing bracket

technical field

The utility model relates to the technical field of medical instruments, in particular to a connecting rod locking device and an external fixing bracket.

Background technique

External fixator has been used for more than 100 years. It is mainly used for temporary fracture fixation after trauma, war injury, earthquake and other emergencies, as well as limb orthopedics, bone defect, limb lengthening, bone infection, etc. The current external fixation bracket has the following problems: limited by the driving position of the bone screw, it cannot provide a good installation angle for the connecting rod, which makes the operation difficult. Therefore, how to improve the external fixing bracket to better provide the installation angle for the connecting rod has become a technical problem to be solved urgently in the art.

Utility model content

In view of this, the present invention provides a connecting rod locking device and an external fixing bracket, and the connecting rod locking device can better provide an installation angle for the connecting rod, which is beneficial to reduce the difficulty of surgery.

In order to achieve the above object, the utility model provides the following technical solutions:

A connecting rod locking device, comprising:

The upper clamping block and the lower clamping block cooperate with each other, and the upper clamping block and the lower clamping block are used for clamping the connecting rod;

a base, the base is provided with a first connecting part for connecting with the bone screw locking device and a second connecting part for connecting with the lower clamping block, the second connecting part is connected with the lower clamping block ball hinged connection;

A ball-end screw, which passes through the second connection part, the lower clamping block and the upper clamping block in sequence, and is connected with the tightening nut.

Optionally, in the above-mentioned connecting rod locking device, the ball head screw is provided with a radially protruding limit protrusion, and the lower clamping block is provided with a limit slot matched with the limit protrusion. .

Optionally, in the above-mentioned connecting rod locking device, a first elastic member is provided in the second connecting portion, and the first elastic member is in abutment with the ball end of the ball screw.

Optionally, in the above-mentioned connecting rod locking device, the upper clamping block and the lower clamping block are slidably connected, and the relative sliding direction is perpendicular to the axis of the ball screw, and the upper clamping block and the lower clamping block are slidably connected. A second elastic member for automatically restoring the upper clamping block is arranged between the clamping blocks.

Optionally, in the above-mentioned connecting rod locking device, the side surface of the upper clamping block is provided with an operation part that is convenient for pushing and pulling the upper clamping block by hand, and the operation part is convex relative to the side surface of the upper clamping block. start setting.

An external fixation bracket includes a bone screw locking device and a connecting rod locking device, wherein the connecting rod locking device is the connecting rod locking device disclosed in any one of the above.

Optionally, in the above external fixation bracket, a single cortical self-tapping screw fixed by the bone screw locking device is included.

Optionally, in the above external fixation bracket, a limit indicator line is provided at a position where the outer surface of the single-cortical self-tapping screw is at a preset distance from the self-tapping tip.

Optionally, in the above external fixation bracket, the bone screw locking device includes:

an L-shaped connecting arm, one end of the connecting arm is detachably and fixedly connected to the first connecting part;

a pressing piece, the pressing piece is arranged on the outer side of the connecting arm;

tightening bolts, the tightening bolts pass through the pressing member and are threadedly connected with the connecting arm;

A spherical clamping piece, the clamping piece is located between the pressing piece and the connecting arm, the clamping piece is provided with a central channel for the bone screw to pass through, and the clamping piece is forced to be elastic Deformed to tighten the bone screw.

Optionally, in the above-mentioned external fixing bracket, the outer surface of the tightening member is provided with a rib for increasing the frictional force.

According to the above technical solutions, in the connecting rod locking device provided by the present invention, the first connecting part of the base is used for connecting with the bone screw locking device, the second connecting part is used for connecting with the lower clamping block, and the ball screw is passed through in sequence. It is connected with the adjusting nut through the second connecting part, the lower clamping block and the upper clamping block. The upper clamping block and the lower clamping block are used to clamp the connecting rod. After the bone screw is installed, the desired installation angle can be flexibly provided for the connecting rod by rotating the lower clamping block, so that the operation is more convenient and less difficult to operate.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative efforts.

1 is a schematic diagram of an external fixation bracket provided by an embodiment of the present invention;

2 is a schematic diagram of a use state of an external fixation bracket provided by an embodiment of the present invention;

3 is a schematic diagram of a locking device for an external fixing bracket provided by an embodiment of the present invention;

Figure 4 is a schematic view of another angle of the locking device shown in Figure 3;

Fig. 5 is a schematic diagram of the use state of the bone screw locking device 2 in Fig. 3;

Fig. 6 is the schematic diagram of connecting arm 21 in Fig. 5;

Fig. 7 is the schematic diagram of the pressing member 22 in Fig. 5;

Figure 8 is a schematic view of the clamp 24 in Figure 5;

Figure 9 is a schematic view of the bone screw 5 in Figure 5;

10 is a schematic diagram of a connecting rod locking device provided by an embodiment of the present invention;

Fig. 11 is a schematic diagram of another angle of the connecting rod locking device shown in Fig. 10;

Figure 12 is a schematic view of the base 1 in Figure 11;

Figure 13 is a schematic view of the lower clamping block 31 in Figure 11;

Figure 14 is a schematic view of the upper clamping block 32 in Figure 11;

FIG. 15 is a schematic diagram of another viewing angle of the upper clamping block 32 shown in FIG. 14;

FIG. 16 is a schematic view of the tightening device 33 in FIG. 11 .

The figure is marked as:

1. Base; 11. First connecting part; 12. Second connecting part; 2. Bone screw locking device; 3. Clamp assembly; 4. Connecting rod; 5. Bone screw; 51. Limit indicator line; 6 7, the fixing screw; 7, the second elastic part;

21, connecting arm; 211, first ball socket; 22, pressing piece; 221, second ball socket; 23, adjusting bolt; 24, clamping piece;

31, lower clamping block; 311, first sliding fitting part; 312, clamping part; 313, screw hole; 314, limit slot;

32, upper clamping block; 321, second sliding fitting part; 322, oblong hole; 323, operating part;

33. Tightening device; 331, ball screw; 3311, limit protrusion; 332, adjusting nut; 333, first elastic member; 334, cock.

Detailed ways

For ease of understanding, the present utility model will be further described below with reference to the accompanying drawings.

1 and 2, an embodiment of the present invention provides an external fixation bracket, which mainly includes a connecting rod 4, a bone screw 5 and a locking device, wherein the structure of the locking device is shown in Figures 3 and 4, the locking device Including a bone screw locking device 2 and a connecting rod locking device, the bone screw 5 is installed on the screw locking device 2, and the connecting rod 4 is installed on the connecting rod locking device.

10 to 16 , the connecting rod locking device provided by the embodiment of the present invention mainly includes a base 1 and a clamping block assembly 3, wherein the clamping block assembly 3 includes an upper clamping block 32 and a lower clamping block 31 that cooperate with each other. The block 32 and the lower clamping block 31 are used to clamp the connecting rod 4 , and the clamping degree is adjusted by the tightening device 33 . The base 1 is provided with a first connecting part 11 for connecting with the bone screw locking device 2 and a second connecting part 12 for connecting with the lower clamping block 31, and the second connecting part 12 is spherically connected with the lower clamping block 31 to adjust the The tightening device 33 includes a ball screw 331 and a nut 332 . The ball screw 331 passes through the second connecting portion 12 , the lower clamping block 31 and the upper clamping block 32 in sequence and is connected with the tightening nut 332 . Since the second connecting part 12 is spherically connected with the lower clamping block 31 , after the bone screw 5 is driven, a suitable angle can be found by rotating the lower clamping block 31 , and then the connecting rod 4 is installed to the clamping block assembly 3 From the above, it can be seen that the connecting rod locking device provided by the present invention can better provide an installation angle for the connecting rod 4, so that the operation is more convenient to carry out and the operation difficulty is lower.

Referring to FIGS. 3 , 4 , and 10 to 12 , the first connecting portion 11 of the base 1 can form a herringbone top surface, that is, two slope surfaces are formed symmetrically, and the bone screw locking device 2 is detachable through the fixing screw 6 It is fixedly installed on the slope surface. In order to facilitate assembly, a pre-embedded nut matched with the fixing screw 6 is generally provided in the first connecting portion 11 . The second connecting part 12 can be located at one end of the first connecting part 11 and located in the middle of the two slope surfaces. 31 Correspondingly, a ball socket matched with the spherical surface can be provided. The symmetrical planes of the two ramp surfaces (that is, the longitudinal section of the first connecting part 11 ) pass along the center line of the second connecting part 12 . The clamping block assembly 3 on the second connecting part 12 and the two The bone screw locking device 2 is distributed in a zigzag shape, and the included angle between the two slope surfaces is generally 110°˜130°, for example, 120°.

Referring to FIGS. 13 and 16 , in this embodiment, the ball screw 331 is provided with a radially protruding limit protrusion 3311 , and the lower clamping block 31 is provided with a limit slot 314 matched with the limit protrusion 3311 . When the ball screw 331 is assembled on the clamping block assembly 3, the ball screw 331 passes through the screw hole 313 of the lower clamping block 31, and the limit protrusion 3311 on the ball screw 331 is inserted into the limit card beside the screw hole 313. In this way, the relative rotation of the ball screw 331 and the clamping block assembly 3 is restricted, so that the clamping degree of the lower clamping block 31 and the upper clamping block 32 can be adjusted only by operating the adjusting nut 332 . In addition, the ball screw 331 can also be designed in other structural forms. For example, a hexagon socket is provided at the threaded end of the ball screw 331. When the clamping degree of the clamping block assembly 3 needs to be adjusted, first insert the socket wrench into the socket. The ball screw 331 is fixed by the hole, and then the adjusting nut 332 is operated to tighten or loosen.

As shown in FIG. 16 , the tightening device 33 may further include a first elastic member 333 , the first elastic member 333 is arranged in the second connecting portion 12 , and the first elastic member 333 is inserted into the second connecting portion 12 and blocked by a cock 334 One end of the first elastic member 333 abuts against the cock 334 , and the other end abuts against the ball end of the ball screw 331 . The first elastic member 333 can be a part that can provide elastic force, such as a compression spring, and the force exerted by the first elastic member 333 on the ball screw 331 is used to make the ball end of the ball screw 331 more tightly assembled to the base The second connecting part 12 of 1 eliminates the gap between the two, so that when the clamp block assembly 3 is rotated to the desired position, accurate positioning can be obtained more quickly, that is, the control precision when the clamp block assembly 3 is rotated is higher.

11, 13 to 15, in this embodiment, the upper clamping block 32 and the lower clamping block 31 are slidably connected, and the relative sliding direction is perpendicular to the axis of the ball screw 331, and the upper clamping block 32 and the lower clamping block 31 A second elastic member 7 for automatically restoring the upper clamping block 32 is disposed therebetween. Both sides of the lower clamping block 31 are provided with a first sliding fitting portion 311 , and both sides of the upper clamping block 32 are provided with a second sliding fitting portion 321 , and the first sliding fitting portion 311 and the second sliding fitting portion 321 are assembled like a tenon joint. In the structure, for example, let the first sliding matching part 311 be a sliding groove, and let the second sliding matching part 321 be a sliding rail embedded in the sliding groove. The ball screw 331 passes through the oblong hole 322 of the upper clamping block 32. The length direction of the oblong hole 322 is consistent with the sliding direction of the upper clamping block 32 relative to the lower clamping block 31. By sliding the upper clamping block 32, it can be moved away from the clamping block. In this way, the clamping part of the upper clamping block 32 and the clamping part 312 of the lower clamping block 31 are shifted by a certain space, which facilitates the insertion of the connecting rod 4 . The second elastic member 7 can be a part that can provide elastic force, such as a compression spring. After the connecting rod 4 is put in, the upper clamping block 32 is released, and then the upper clamping block 32 automatically returns under the action of the elastic force of the second elastic member 7 That is, the clamping part of the upper clamping block 32 returns to the position opposite to the clamping part 312 of the lower clamping block 31 to clamp the connecting rod 4 . In order to facilitate the operation of the upper clamping block 32 , in this embodiment, the side surface of the upper clamping block 32 is provided with an operation portion 323 which is convenient for pushing the upper clamping block 32 by hand. Specifically, the operation portion 323 may be designed as a sloped surface.

Referring to FIGS. 4 to 9 , in this embodiment, the bone screw locking device 2 includes an L-shaped connecting arm 21 , a pressing member 22 , a tightening bolt 23 and a spherical tightening member 24 , wherein one end of the connecting arm 21 is connected to the The first connecting portion 11 is detachably connected, so the form of the locking device can be changed by adjusting the connecting arm 21, that is, FIG. In 4, the two bone screw locking devices 2 are M-shaped with the base 1, that is, the two bone screw locking devices 2 are arranged from the first connecting part 11 toward the second connecting part 12. Both the locking devices 2 are arranged from the first connecting part 11 to the direction away from the second connecting part 12, then the two bone screw locking devices 2 and the base 1 can be formed in a Y shape, or the two bone screw locking devices 2 can be formed by If the first connecting parts 11 are arranged in opposite directions, the two bone screw locking devices 2 can be S-shaped.

The pressing member 22 is arranged on the outer side of the connecting arm 21, the tightening member 24 is located between the pressing member 22 and the connecting arm 21, the tightening bolt 23 passes through the pressing member 22 and is threadedly connected with the connecting arm 21, and the tightening bolt 23 is rotated. 23 can change the size of the gap between the pressing member 22 and the connecting arm 21, so as to adjust the degree of clamping of the tightening member 24. The clamp 24 is provided with a central channel through which the bone screw 5 passes, and the clamp 24 is forced to be elastically deformed to clamp the bone screw 5 . The connecting arm 21 is provided with a first ball socket 211 , the pressing member 22 is provided with a second ball socket 221 , and the clamping member 24 is installed in the ball cavity formed by the first ball socket 211 and the second ball socket 221 , as shown in FIG. 8 As shown, the tightening member 24 may specifically be a sphere provided with a plurality of incisions which are alternately communicated with both ends. In this embodiment, the outer surface of the tightening member 24 is provided with ribs for increasing the frictional force, so that the tightening member 24 is not easily shaken after being clamped by the pressing member 22 and the connecting arm 21 . As shown in FIG. 7 , the pressing member 22 can be specifically designed in an arcuate shape.

As shown in FIG. 9 , the bone screw 5 fixed by the bone screw locking device 2 is preferably a unicortical self-tapping screw, which can reduce the occurrence of infection in the medullary cavity. The head end of the bone screw 5 has an arc-shaped slot on one side to form a self-tapping tip. In this embodiment, a limit indication line 51 is provided on the outer surface of the bone screw 5 at a preset distance from the self-tapping tip. The limit indication line 51 can be For example, a marking line that can be identified with the naked eye, the limit indicator line 51 is used to facilitate the understanding of the entry depth of the bone screw 5, so that in the reduction-temporary fixation stage, there is no need to observe the insertion depth of the bone screw 5 through an imaging instrument, thereby Reduce radiation exposure. Specifically, the length of the thread segment of the bone screw 5 may be 15 mm, and the limit indicator line 51 may be set at a position 5 mm away from the thread segment.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A connecting rod locking device, characterized in that, comprising: The upper clamping block and the lower clamping block cooperate with each other, and the upper clamping block and the lower clamping block are used for clamping the connecting rod; a base, the base is provided with a first connecting part for connecting with the bone screw locking device and a second connecting part for connecting with the lower clamping block, the second connecting part is connected with the lower clamping block ball hinged connection; A ball-end screw, which passes through the second connection part, the lower clamping block and the upper clamping block in sequence, and is connected with the tightening nut. 2 . The connecting rod locking device according to claim 1 , wherein the ball head screw is provided with a limit protrusion protruding in a radial direction, and the lower clamping block is provided with a limit protrusion that is compatible with the limit protrusion. 3 . Matching limit slot. 3 . The connecting rod locking device according to claim 2 , wherein a first elastic member is provided in the second connecting portion, and the first elastic member is in contact with the ball end of the ball screw. 4 . 4 . The connecting rod locking device according to claim 1 , wherein the upper clamping block and the lower clamping block are slidably connected, and the relative sliding direction is the same as that of the ball screw. 5 . The axis is vertical, and a second elastic member for automatically restoring the upper clamping block is arranged between the upper clamping block and the lower clamping block. 5 . The connecting rod locking device according to claim 4 , wherein a side surface of the upper clamping block is provided with an operation part which is convenient for pushing and pulling the upper clamping block by hand, and the operation part is opposite to the upper clamping block. 6 . The side surface of the clamping block is convexly arranged. 6 . An external fixation bracket, comprising a bone screw locking device and a connecting rod locking device, wherein the connecting rod locking device is the connecting rod locking device according to any one of claims 1 to 5 . 7. The external fixation bracket according to claim 6, characterized in that it comprises a monocortical self-tapping screw fixed by the bone screw locking device. 8 . The external fixation bracket according to claim 7 , wherein a limit indicator line is provided at a position where the outer surface of the single-cortical self-tapping screw is at a predetermined distance from the self-tapping tip. 9 . 9. The external fixation bracket according to any one of claims 6 to 8, wherein the bone screw locking device comprises: an L-shaped connecting arm, one end of the connecting arm is detachably and fixedly connected to the first connecting part; a pressing piece, the pressing piece is arranged on the outer side of the connecting arm; tightening bolts, the tightening bolts pass through the pressing member and are threadedly connected with the connecting arm; A spherical clamping piece, the clamping piece is located between the pressing piece and the connecting arm, the clamping piece is provided with a central channel for the bone screw to pass through, and the clamping piece is forced to be elastic Deformed to tighten the bone screw. 10 . The external fixing bracket according to claim 9 , wherein the outer surface of the tightening member is provided with ribs for increasing friction. 11 .

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