CN210749445U

CN210749445U - Bone screw connecting auxiliary part

Info

Publication number: CN210749445U
Application number: CN201920991271.6U
Authority: CN
Inventors: 李严; 邵苍
Original assignee: Hebei Ruihe Medical Equipment Co ltd
Current assignee: Hebei Ruihe Medical Equipment Co ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-06-16
Anticipated expiration: 2029-06-27

Abstract

The utility model provides a bone screw connects auxiliary member belongs to the medical instrument field, including tail cap, nail pole and external screw thread. The tail cap is provided with a bone screw insertion hole and a connecting structure for connecting with a screwing tool; the tail end of the screw rod is connected with the tail cap, and a distraction gap communicated with the bone screw insertion hole is formed in the middle of the screw rod at intervals and is used for being distracted by the bone screw inserted into the distraction gap; and the external thread is arranged around the peripheries of the two nail rods and used for driving the two nail rods to be screwed into the bone block. The utility model discloses a bone screw connects auxiliary member, through with bone screw from bone screw patchhole screw in to strutting the clearance, strut two nail poles for the nail pole compresses tightly on the inner wall that the bone piece bored the hole, can increase the external screw thread on the one hand and bore the pressure between the downthehole wall, and on the other hand also can be with boring the sclerotin compaction near the hole, thereby improves the joint strength of bone screw and bone piece, realizes stable fixed.

Description

Bone screw connecting auxiliary part

Technical Field

The utility model belongs to the technical field of medical instrument, more specifically say, relate to a bone screw connects auxiliary member.

Background

Bone screws are non-active surgical implants for osteosynthesis, which are commonly used for the direct fixation of bone fragments or for the fixation of bone fractures in cooperation with other internal implants, such as bone plates or intramedullary nails. In the connection of an internal implant and a bone block, the conventional bone screw generally fixes the bone block through threads, but for patients with osteoporosis, the threaded connection strength of the bone screw and the osteoporosis bone block is low, and the requirement of stable fixation is difficult to meet.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bone screw connects auxiliary member to the threaded connection intensity of bone screw and loose sclerotin that exists among the solution prior art is lower, connects unstable technical problem.

In order to achieve the above object, the present invention provides a bone screw connection auxiliary member, including:

the tail cap is provided with a bone screw inserting hole and a connecting structure for connecting with a screwing tool;

the tail ends of the two nail rods are connected with the tail cap, and the middle of the two nail rods is provided with an opening gap communicated with the bone screw insertion hole at intervals and used for being opened by the bone screw inserted into the opening gap; and

the external thread is arranged around the periphery of the two screw rods and used for driving the two screw rods to be screwed into the bone blocks.

Furthermore, connection structure is for locating on the tail cap top surface and be used for with the draw-in groove of revolving the instrument joint of twisting.

Furthermore, the bone screw inserting hole is formed in the bottom of the clamping groove.

Furthermore, the clamping groove is an inner hexagonal groove or a quincuncial groove.

Furthermore, the periphery of the tail cap is provided with a limiting ring which is used for being abutted against the outer surface of the bone block.

Furthermore, a backstop structure is arranged between the tail cap and the two nail rods; the backstop structure includes:

one end of the connecting rod is connected with the tail cap, and the other end of the connecting rod is connected with the tail ends of the two nail rods; and

the fixed end of the elastic warping sheet is connected to the connecting rod, and the free end of the elastic warping sheet deviates from the connecting rod and is used for being close to the elastic deformation of the connecting rod.

Furthermore, an accommodating groove for accommodating the elastic warping sheet after elastic deformation is formed in the outer side wall of the connecting rod.

Further, an included angle between the orientation of the free end of the elastic fin and the orientation of the end, back to the nail rod, of the connecting rod is an acute angle α.

Furthermore, one end of the bone screw insertion hole extends into the connecting rod and is communicated with the distraction gap.

Further, the bone screw connecting auxiliary piece is an absorbable material component.

The utility model provides a bone screw connects auxiliary member's beneficial effect lies in: compared with the prior art, the utility model discloses a bone screw connects auxiliary member will twist soon the instrument of twisting when using and pass through connection structure and tail cap to be connected, then utilizes the external screw thread to make two nail pole screw in bone pieces. Then, the bone screw is screwed into the opening gap from the bone screw inserting hole to open the two screw rods, so that the screw rods are tightly pressed on the inner wall of the bone block drilling hole, on one hand, the pressure between the external thread and the inner wall of the drilling hole can be increased, on the other hand, the bone near the drilling hole can be compacted, the connection strength of the bone screw connection auxiliary part and the bone block is improved, the connection strength of the bone screw and the bone block is further improved, and stable fixation is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

FIG. 1 is a perspective view of a bone screw attachment aid provided in accordance with an embodiment of the present invention;

FIG. 2 is a front view of a bone screw attachment aid provided in accordance with an embodiment of the present invention;

FIG. 3 is a side view of FIG. 2;

fig. 4 is a cross-sectional view taken at a-a in fig. 3.

Wherein, in the figures, the respective reference numerals:

1-tail cap; 11-clamping groove and 12-bone screw inserting hole; 13-a limit ring; 2-nailing the rod; 21-distraction of the gap; 3-external thread; 4-a connecting rod; 41-elastic fin; 42-a containing groove.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 4 together, a bone screw connection auxiliary member according to an embodiment of the present invention will now be described. A bone screw connection aid comprises a tail cap 1, two nail rods 2 and an external thread 3.

The tail cap 1 is provided with a bone screw insertion hole 12 and a connecting structure for connection with a screwing tool.

The tail ends of the two nail rods 2 are connected with the tail cap 1, and the middle of the two nail rods is provided with an expansion gap 21 communicated with the bone screw insertion hole 12 at intervals for being expanded by the bone screw inserted into the expansion gap 21.

The external thread 3 encircles the periphery of locating two nail poles 2 for drive two nail poles 2 screw in the bone piece.

Compared with the prior art, the utility model discloses bone screw connects auxiliary member will revolve wrong instrument and pass through connection structure and be connected with tail cap 1 when using, then utilize external screw thread 3 to make two nail poles 2 screw in bone pieces. Then, the bone screw is inserted into the opening gap 21 from the bone screw inserting hole 12 to open the two screw rods 2, so that the screw rods 2 are tightly pressed on the inner wall of the bone block drilling hole, on one hand, the pressure between the external thread 3 and the inner wall of the drilling hole can be increased, on the other hand, the bone near the drilling hole can be compacted, the connection strength of the bone screw connection auxiliary part and the bone block is improved, the connection strength of the bone screw and the bone block is further improved, and stable fixation is realized.

Specifically, two nail rods 2 are oppositely arranged in parallel, and the respective tail ends are respectively fixed on the tail cap 1, so that the outer peripheral surfaces of the two nail rods 2 form a cylinder shape. The screwing tool is connected with the tail cap 1 through a connecting structure and is used for applying a rotating torque to the tail cap 1 through the screwing tool, so that the tail cap 1 drives the two nail rods 2 to rotate, and the two nail rods 2 are drilled into a bone block through the external threads 3. The nail rods 2 can be made of a material with a soft texture, so that after the bone screws are inserted into the distraction gap 21, the two nail rods 2 can be deformed to be distracted by the bone screws. More specifically, the bone screw may be a screw having a screw outer diameter larger than the width of the distraction gap 21, and the two screw rods 2 are distracted by screwing the screw of the screw into the distraction gap 21.

Referring to fig. 1 and 4 together, as a specific embodiment of the bone screw connection auxiliary member provided by the present invention, the connection structure is a slot 11 disposed on the top surface of the tail cap 1 and used for being engaged with a screwing tool. The screwing tool is clamped with the tail cap 1 through the clamping groove 11, so that the screwing tool is convenient to connect and separate with the tail cap 1.

Referring to fig. 4, as an embodiment of the bone screw connection auxiliary member provided in the present invention, a bone screw insertion hole 12 is formed at the bottom of the slot 11. This kind of setting can reduce the area of tail cap 1 top surface for the volume of tail cap 1 is littleer.

Referring to fig. 1 and 4 together, as an embodiment of the bone screw connection auxiliary member provided by the present invention, the slot 11 is an inner hexagonal slot or a quincunx slot. The arrangement is convenient for the clamping connection of a common internal hexagonal wrench or a common box end wrench and the internal hexagonal groove or the double offset ring groove, and is convenient to use. Specifically, the internal hexagonal groove, the tail cap 1 and the external thread 3 are coaxially arranged, or the plum blossom groove, the tail cap 1 and the external thread 3 are coaxially arranged.

Referring to fig. 1 to 4, as an embodiment of the bone screw connection auxiliary member provided in the present invention, a stop ring 13 for abutting against the outer surface of the bone block is disposed on the outer periphery of the tail cap 1. This arrangement prevents the tail cap 1 from being screwed into the bone block. Specifically, the limiting ring 13 is an outward convex circular ring arranged around the periphery of the top end of the tail cap 1.

Referring to fig. 1 to 4, as a specific embodiment of the bone screw connection auxiliary member provided by the present invention, a retaining structure is provided between the tail cap 1 and the two nail rods 2; the backstop structure comprises a connecting rod 4 and an elastic fin 41.

One end of the connecting rod 4 is connected with the tail cap 1, and the other end is connected with the tail ends of the two nail rods 2.

The elastic rocker 41 is connected to the connecting rod 4 and is used for entering the cancellous bone region of the bone block, and the free end deviates from the connecting rod 4 and is warped for elastic deformation of the free end close to the connecting rod 4.

The outer surface of the bone block is cortical bone, the inner part of the bone block is cancellous bone, and the bone density of the cancellous bone is lower than that of the cortical bone. When using, two nail poles 2 pass the cortical bone layer, get into back cancellous bone district after, along with two nail poles 2 continue to bore into to the depths, two nail poles 2 pull into the cortical bone layer with connecting rod 4, and the elastic fin 41 is gone up the inner wall extrusion deformation who bores the hole by the cortical bone layer this moment, and the free end of elastic fin 41 is pressed to connecting rod 4. Afterwards, as two nail rods 2 continue to drill into the deep part, two nail rods 2 pull the connecting rod 4 into the cancellous bone area, at this time, the elastic fin 41 on the connecting rod 4 is also brought into the cancellous bone area, and because the bone density of the cancellous bone is lower than that of the cortical bone, the pressure of the cancellous bone on the elastic fin 41 is reduced, the elastic fin 41 rebounds, and the free end is far away from the connecting rod 4, so that the elastic fin 41 cannot exit from the drilling hole of the cortical bone layer, and the bone screw connection auxiliary member is prevented from retreating.

Specifically, the tail cap 1, the connecting rod 4, the two nail rods 2 and the elastic fin 41 are of an integral structure, and the elastic fin 41 can be arranged into a thin sheet, so that the elastic fin has certain elasticity. One, two, three or four elastic fins 41 are uniformly distributed on the circumference of the connecting rod 4.

Referring to fig. 1 to 4, as a specific embodiment of the bone screw connection auxiliary member of the present invention, a receiving groove 42 for receiving an elastically deformed elastic fin 41 is formed on an outer side wall of the connecting rod 4.

Specifically, the receiving groove 42 is provided on a portion of the outer side wall of the connecting rod 4 facing the resilient fin 41, and the depth of the receiving groove 42 may be set to be able to completely sink the resilient fin 41. The receiving grooves 42 may be provided in one-to-one correspondence with the elastic fins 41.

Referring to fig. 1 to 4, as a specific embodiment of the bone screw connection auxiliary member provided by the present invention, an included angle between the orientation of the free end of the elastic fin 41 and the orientation of the connecting rod 4 facing away from the nail shaft 2 is an acute angle α. with this arrangement, when the bone screw connection auxiliary member retreats, the free end of the elastic fin 41 can form a hook connection with the cortical bone layer, thereby preventing the bone screw connection auxiliary member from retreating, and the resistance of the cortical bone layer to the free end of the elastic fin 41 can also make the free end of the elastic fin 41 be further away from the connecting rod 4, further increasing the retreating resistance of the bone screw connection auxiliary member.

Referring to fig. 4, as an embodiment of the bone screw connection auxiliary member provided in the present invention, one end of the bone screw insertion hole 12 extends into the connecting rod 4 and communicates with the distraction gap 21.

Specifically, the bone screw insertion hole 12 extends from the groove bottom of the clamping groove 11 along the axis of the tail cap 1 to the inside of the connecting rod 4, and the bone screw insertion hole 12 is communicated with the distraction gap 21 after penetrating through the connecting rod 4.

Referring to fig. 1 to 4, as an embodiment of the bone screw connection auxiliary member of the present invention, the bone screw connection auxiliary member is an absorbable material member. So that the bone screw connection auxiliary piece can be absorbed by the human body, thereby being unnecessary to be taken out by secondary operation.

Specifically, the tail cap 1, the connecting rod 4, the two nail rods 2 and the elastic fin 41 are of an integrated structure made of medical polylactide.

Further more specifically, the axes of the tail cap 1, the catching groove 11, the bone screw insertion hole 12, the connecting rod 4, and the external thread 3 coincide. Threads may be provided on the inner wall of the distraction gap 21 to facilitate screwing of the bone screw attachment aid into the distraction gap 21.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A bone screw attachment aid, comprising:

the tail cap (1) is provided with a bone screw insertion hole (12) and a connecting structure for connecting with a screwing tool;

the tail ends of the two nail rods (2) are connected with the tail cap (1), and the middle of the two nail rods is provided with a distraction gap (21) which is communicated with the bone screw insertion hole (12) at intervals and is used for being distracted by the bone screw inserted into the distraction gap (21); and

the external threads (3) are arranged around the periphery of the nail rod (2) and used for driving the nail rod (2) to be screwed into the bone block.

2. The bone screw attachment aid of claim 1, wherein: the connecting structure is arranged on the top surface of the tail cap (1) and used for being connected with a clamping groove (11) of the screwing tool in a clamping mode.

3. The bone screw attachment aid of claim 2, wherein: the bone screw inserting hole (12) is formed in the bottom of the clamping groove (11).

4. The bone screw attachment aid of claim 3, wherein: the clamping groove (11) is an inner hexagonal groove or a plum blossom groove.

5. The bone screw attachment aid of claim 1, wherein: the periphery of the tail cap (1) is provided with a limiting ring (13) which is used for being abutted against the outer surface of the bone block.

6. Bone screw connection aid according to any one of claims 1 to 5, characterized in that: a backstop structure is arranged between the tail cap (1) and the two nail rods (2); the backstop structure includes:

one end of the connecting rod (4) is connected with the tail cap (1), and the other end of the connecting rod is connected with the tail ends of the two nail rods (2); and

elastic warping pieces (41), the fixed ends of which are connected to the connecting rods (4), and the free ends of which are deviated from the connecting rods (4) to warp and are used for the free ends of which are close to the elastic deformation of the connecting rods (4).

7. The bone screw attachment aid of claim 6, wherein: and the outer side wall of the connecting rod (4) is provided with an accommodating groove (42) for accommodating the elastic fin (41) after elastic deformation.

8. The bone screw connection aid according to claim 6, characterized in that the angle between the orientation of the free end of the resilient fin (41) and the orientation of the end of the connecting rod (4) facing away from the shank (2) is an acute angle α.

9. The bone screw attachment aid of claim 6, wherein: one end of the bone screw insertion hole (12) extends into the connecting rod (4) and is communicated with the distraction gap (21).

10. The bone screw attachment aid of claim 1, wherein: the bone screw connecting auxiliary part is a component made of absorbable material.