Bone cement hollow nail

Abstract

The utility model relates to the field of medical instruments, and provides a bone cement hollow screw which aims at solving the problems that when bone cement is injected into an existing hollow bone screw, much bone cement overflows from a head end hole of the hollow bone screw, little bone cement overflows from a side face mud injection hole, and the fastening force of the hollow bone screw cannot be effectively improved. A thread part is arranged on the outer side wall of the lower end of the nail body, a mud injection hole is formed in a thread gap and communicated with the through hole, an inner sleeve is arranged in the through hole, one end of the inner sleeve is an open end, the other end of the inner sleeve is a closed end, the closed end of the inner sleeve extends into the nail body from the through hole in the upper end of the nail body, and a clamping block is arranged outside the inner sleeve and penetrates through a clamping groove in the hole wall of the through hole. The hollow bone screw has the advantages that the structure is simple, operation is convenient, and the fastening force of the hollow bone screw can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a hollow bone cement nail. Background Technology

[0002] In existing hollow bone screws, when bone cement is injected, the bone cement overflows from the head hole of the hollow bone screw instead of being injected into the bone through the side injection hole. This results in a small amount of bone cement on both sides of the hollow bone screw thread, which cannot effectively improve the fastening force of the hollow bone screw. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to solve the problem that when bone cement is injected into existing hollow bone screws, more bone cement overflows from the head hole of the hollow bone screw and less overflows from the side injection hole, which cannot effectively improve the fastening force of the hollow bone screw, a bone cement hollow nail is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a hollow bone cement nail, including a nail body with a through hole in the middle, a threaded part on the outer side wall of the lower end of the nail body, a mud injection hole at the thread gap, the mud injection hole communicating with the through hole, an inner sleeve provided in the through hole, one end of the inner sleeve being an open end and the other end being a closed end, the closed end of the inner sleeve extending into the nail body from the through hole at the upper end of the nail body, a locking block on the outside of the inner sleeve, the locking block completing the guidance and limiting through the locking groove on the wall of the through hole, and openings with a number and position corresponding one-to-one with the mud injection holes on the nail body on the inner sleeve.

[0005] Furthermore, the slot is an L-shaped slot, and the locking block on the inner sleeve extends into the through hole along the straight section of the L-shaped slot. After the locking block rotates along the vertical section of the L-shaped slot, the axial positioning of the inner sleeve and the through hole is completed.

[0006] Furthermore, the opening of the inner sleeve is provided with an internal thread, which is used for threaded connection with the bone cement injection device.

[0007] Furthermore, the end face of the inner sleeve sealing end is flush with or lower than the end face of the lowest end of the nail body.

[0008] The beneficial effects of this utility model are as follows: The hollow bone cement screw of this utility model seals the head end hole of the hollow bone screw with an inner sleeve, so that the bone cement is squeezed out from the side injection hole under sufficient pressure. This is to prevent the bone cement from overflowing too much from the head end hole of the hollow bone screw and overflowing too little from the side injection hole or not being injected into the bone from the side injection hole. This solves the problem of bone cement accumulating at the head end of the hollow bone screw and the amount of bone cement on both sides of the hollow bone screw thread, and effectively improves the fastening force of the hollow bone screw.

[0009] In summary, this utility model has the characteristics of simple structure, easy operation, and effective improvement of the fastening force of hollow bone screws. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a cross-sectional view of the present invention;

[0012] Figure 2 yes Figure 1 A schematic diagram of the disassembled structure;

[0013] Figure 3 This is a cross-sectional view of the nail body of this utility model;

[0014] Figure 4 This is a sectional view of the inner sleeve of this utility model.

[0015] In the diagram: 1. Through hole, 2. Nail body, 3. Threaded part, 4. Mud injection hole, 5. Inner sleeve, 6. Locking block, 7. Locking groove, 8. Opening, 9. Internal thread, 10. Internal hexagonal hole. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] Figures 1 to 4The illustrated hollow bone cement screw includes a screw body 2 with a through hole 1 in the middle. The screw body 2 is a conventional hollow bone screw. The outer wall of the lower end of the screw body 2 has a threaded portion 3. The threaded portion 3 has a mud injection hole 4 at the thread gap, which communicates with the through hole 1. An inner sleeve 5 is inserted into the through hole 1. One end of the inner sleeve 5 is an open end, and the other end is a closed end. The closed end of the inner sleeve 5 extends into the screw body 2 from the through hole 1 at the upper end of the screw body 2. The outer side of the inner sleeve 5 has a retaining block 6. The retaining block 6 completes the guidance through the retaining groove 7 on the wall of the through hole 1. Specifically, the slot 7 is an L-shaped slot, which includes a straight section and a vertical section. The locking block 6 on the inner sleeve 5 extends into the through hole 1 along the straight section of the L-shaped slot. Then, the locking block 6 on the inner sleeve 5 is rotated along the vertical section of the L-shaped slot to complete the axial positioning of the inner sleeve 5 and the through hole. At this point, the inner sleeve 5 and the nail body 2 are assembled. After the assembly is completed, the opening 8 on the inner sleeve 5 and the mud injection hole 4 on the nail body 2 correspond to each other, and the end face of the sealing end of the inner sleeve 5 is flush with or lower than the end face of the lowest end of the nail body 2.

[0018] The specific operation process is as follows:

[0019] First, the nail body 2 is fixed using the conventional method through the internal hexagonal hole 10 at the top of the nail body 2;

[0020] Then, insert the inner sleeve 5 into the through hole 1, and rotate the inner sleeve 5 to make the locking block 6 engage with the L-shaped slot. After it is engaged, the opening 8 on the inner sleeve 5 corresponds to the mud injection hole 4 on the nail body 2.

[0021] Then, the bone cement is injected by connecting it to the bone cement injection device through the internal thread 9 at the opening of the inner sleeve 5.

[0022] Finally, rotate and pull out the inner sleeve 5.

[0023] After the end hole of nail body 2 is sealed, the bone cement is squeezed out from the side opening 8 and the mud injection hole 4 under sufficient pressure.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A hollow bone cement nail, comprising a nail body with a through hole in the middle, a threaded portion on the outer side wall at the lower end of the nail body, and a mud injection hole at the thread gap, the mud injection hole communicating with the through hole, characterized in that: An inner sleeve is provided in the through hole. One end of the inner sleeve is an open end and the other end is a closed end. The closed end of the inner sleeve extends into the nail body from the through hole at the upper end of the nail body. The outer side of the inner sleeve has a locking block. The locking block completes the guidance and limiting through the locking groove on the wall of the through hole. The inner sleeve has openings with a number and position that correspond one-to-one with the mud injection holes on the nail body.

2. The bone cement hollow screw according to claim 1, characterized in that: The slot is an L-shaped slot. The locking block on the inner sleeve extends into the through hole along the straight section of the L-shaped slot. After the locking block rotates along the vertical section of the L-shaped slot, the inner sleeve and the through hole are axially positioned.

3. The bone cement hollow screw according to claim 1, characterized in that: The opening at the opening end of the inner sleeve is provided with an internal thread, which is used for threaded connection with the bone cement injection device.

4. The bone cement hollow screw according to claim 1, characterized in that: The end face of the inner sleeve sealing end is flush with or lower than the end face of the lowest end of the nail body.

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