PEEK nail sheath fixing system

Abstract

The utility model relates to the technical field of medical instruments, in particular to a PEEK nail sheath fixing system which comprises a fixing sheath and an interface screw, a plurality of gaps in the vertical direction are formed in the side wall of the fixing sheath, a plurality of implanting holes are formed in the two sides of the upper ends of the gaps, fixing teeth are arranged in the implanting holes, one end of each fixing tooth is connected with the fixing sheath, and the fixing teeth protrude out of the surface of the fixing sheath. The fixing sheath is provided with a gap, the top of the fixing sheath is provided with an insertion hole for an interface screw to enter, two sides of the gap are provided with sawtooth portions, a recess is arranged between every two sawtooth portions, the top end of the fixing sheath is provided with an arc-shaped round cap, and the round cap is provided with a through hole. Meanwhile, the fixing teeth are opened to abut against the centrum, the overall contact area of the fixing sheath and the centrum is increased, the contact area is further increased by additionally arranging the sunken part, friction is increased, and displacement of the fixing sheath is prevented; the structure is simple, operation is convenient, and the success rate of surgery is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a PEEK nail sheath fixation system. Background Technology

[0002] Peek fixation systems typically refer to medical devices made of polyetheretherketone (PEEK) for bone fixation during orthopedic surgery. PEEK is a high-performance thermoplastic widely used in the medical field, particularly in spinal surgery and trauma orthopedics, due to its excellent biocompatibility, mechanical strength, and elastic modulus similar to human bone. For example, in tibial and femoral fixation surgery, after fabrication, an adjustable looped titanium plate is used to fix the femoral end. The tunnel is then widened, the fixation sheath is implanted, the interface screw is screwed in, and excess tendon grafts are removed to complete the surgery. Existing fixation systems often use fixing teeth, relying primarily on these teeth to clamp the looped titanium plate. This results in a relatively small contact area, leading to slight displacement and delaying patient recovery. Therefore, there is a need to develop a fixation sheath system that increases the contact area between the fixation sheath and the looped titanium plate.

[0003] Patent CN202222156913.5 discloses a spinal fixation system for osteoporosis, comprising a spinal screw and a fixation sheath. The spinal screw has threads on its circumferential surface. The fixation sheath is a hollow rod extending vertically through the spine. A locking groove, communicating with the interior of the fixation sheath, is formed on the side wall of the fixation sheath. A locking block is fixedly connected to the inner wall of the locking groove. The spinal screw passes through the fixation sheath and is used to drive the locking block to move. This patent suffers from the problem of a small contact area between the fixation sheath and the vertebral body. Utility Model Content

[0004] In order to solve the problems existing in the prior art, this utility model provides a PEEK nail sheath fixing system to solve the problems of unreliable fixing and slight displacement of the nail sheath system.

[0005] To solve the above problems, the technical solution of this utility model is as follows: A PEEK nail sheath fixation system includes a cylindrical fixation sheath and an interface screw. The fixation sheath has several vertically oriented slits on its sidewall. Several implantation holes are provided on both sides of the upper end of the slits. A fixation tooth is provided in the implantation hole, with one end connected to the fixation sheath. The fixation tooth protrudes from the surface of the fixation sheath. An insertion hole is provided at the top of the fixation sheath for the interface screw to enter.

[0006] Furthermore, serrated portions are provided on both sides of the rift.

[0007] Furthermore, a recess is provided between each pair of the serrated portions.

[0008] Furthermore, there are two such cracks.

[0009] Furthermore, the bottom of the fixing sheath is provided with an arc-shaped cap, and the cap has a through hole.

[0010] Furthermore, the fixing sheath is conical, with its diameter gradually decreasing from top to bottom.

[0011] Furthermore, the first tooth at the lower end of the fixed tooth has an inclined surface, and the downward extension line of the inclined surface is close to the center line of the fixed sheath.

[0012] Furthermore, the fixing sheath and interface screw are made of PEEK material.

[0013] Furthermore, the interface screw is tapered, with its diameter gradually decreasing from top to bottom.

[0014] Compared with the prior art, this utility model has the following advantages: by screwing in the interface screw, the fixing sheath can be opened along the crack, and at the same time the fixing teeth are opened to abut against the vertebral body, which increases the overall contact area between the fixing sheath and the vertebral body. The added recess further increases the contact area and friction, preventing the fixing sheath from shifting and ensuring that the fixing sheath is firmly fixed. The structure is simple and the operation is convenient, which greatly improves the success rate of the operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front view of the fixed sheath of this utility model;

[0016] Figure 2 This is a schematic diagram of the opening of the tear in this utility model.

[0017] In the diagram: 1. Fixing sheath, 2. Interface screw, 3. Crack, 4. Implantation hole, 5. Fixing tooth, 501 bevel, 6. Serrated part, 7. Recess, 8. Round cap, 9. Through hole. Detailed Implementation

[0018] like Figure 1 , Figure 2 As shown, a PEEK nail sheath fixation system includes a cylindrical fixation sheath 1 and an interface screw 2. The fixation sheath 1 and the interface screw 2 are made of PEEK material. The side wall of the fixation sheath 1 has several vertically oriented slits 3. Several implantation holes 4 are provided on both sides of the upper end of the slits 3. A fixation tooth 5 is provided in the implantation hole 4, with one end connected to the fixation sheath 1. The fixation tooth 5 protrudes from the surface of the fixation sheath 1. The first tooth at the lower end of the fixation tooth 5 has a bevel 501. The downward extension line of the bevel 501 is close to the center line of the fixation sheath 1. When the fixation sheath 1 is inserted, squeezing the fixation tooth 5 will press the fixation tooth 5 into the fixation sheath 1. An insertion hole for the interface screw 2 to enter is provided at the top of the fixation sheath 1, which is not shown in the figure.

[0019] The two sides of the slit 3 are provided with serrated parts 6. There are two slits in the slit 3. The serrated parts 6 can reduce the deformation stress of the fixing sheath 1, making it easier for the fixing sheath 1 to open at the slit 3, saving the doctor's physical strength.

[0020] A recess 7 is provided between each pair of serrated parts 6, and the recesses 7 form a wave shape to increase the contact area with the cone body, increase the friction force, and further prevent the fixed sheath 1 from shifting.

[0021] The bottom of the fixation sheath 1 is provided with an arc-shaped cap 8, and a through hole 9 is provided on the cap 8. The cap 8 allows the fixation sheath 1 to enter the intervertebral space better, and the cap 8 has no sharp edges, which can avoid the sharp edges from scratching the bone. The through hole 9 makes it easy for the interface screw 2 to be screwed into the fixation sheath 1.

[0022] The fixing sheath 1 is conical, with its diameter gradually decreasing from top to bottom. The interface screw 2 is also conical, with its diameter gradually decreasing from top to bottom, so that when the interface screw 2 is screwed in, the fixing teeth 5 are pushed out and the crack 3 is opened.

[0023] The above specific embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A PEEK nail sheath fixing system, comprising a cylindrical fixing sheath and an interface screw, characterized in that: The fixation sheath has several vertical slits on its sidewall, and several implantation holes are provided on both sides of the upper end of the slits. A fixing tooth is provided in the implantation hole, with one end connected to the fixation sheath. The fixing tooth protrudes from the surface of the fixation sheath, and an insertion hole is provided at the top of the fixation sheath for the interface screw to enter.

2. The PEEK nail sheath fixation system according to claim 1, characterized in that: The cleavage has serrated sections on both sides.

3. The PEEK nail sheath fixation system according to claim 2, characterized in that: A recess is provided between each pair of serrated portions.

4. The PEEK nail sheath fixation system according to claim 3, characterized in that: There are two cracks.

5. A PEEK nail sheath fixation system according to claim 1, characterized in that: The bottom of the fixed sheath is provided with an arc-shaped cap, and the cap has a through hole.

6. The PEEK nail sheath fixation system according to claim 1, characterized in that: The fixing sheath is conical, with its diameter gradually decreasing from top to bottom.

7. The PEEK nail sheath fixation system according to claim 1, characterized in that: The first tooth at the lower end of the fixed tooth has an inclined surface, and the downward extension line of the inclined surface is close to the center line of the fixed sheath.

8. A PEEK nail sheath fixation system according to claim 1, characterized in that: The fixing sheath and interface screws are made of PEEK material.

9. A PEEK nail sheath fixation system according to claim 1, characterized in that: The interface screw is conical, with its diameter gradually decreasing from top to bottom.

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