Sighting sleeve assembly for intramedullary nail positioning

Abstract

The utility model relates to an aiming sleeve assembly for positioning an intramedullary nail, which comprises a puncture needle, an inner sleeve and an outer sleeve, and the front end of the puncture needle is provided with a tip; the puncture needle is sleeved with the inner sleeve, an annular protrusion is arranged on the outer wall, close to the rear end, of the inner sleeve, and a sectioning groove located in the axial direction of the inner sleeve is formed in the rear end of the inner sleeve; the inner sleeve is sleeved with the outer sleeve, an annular groove is formed in the inner wall, close to the rear end, of the outer sleeve, and the annular groove is matched with the annular protrusion. Mutual movement of the inner sleeve and the outer sleeve can be effectively prevented, the matching stability of the inner sleeve and the outer sleeve is improved, secondary injury to a patient is avoided, and meanwhile the clinical experience effect of a doctor is improved.

Description

Technical Field

[0001] This utility model belongs to the field of orthopedic medical device technology, specifically relating to an aiming sleeve assembly for intramedullary nail positioning. Background Technology

[0002] During intramedullary nailing surgery, after locating the intramedullary nail using a targeting frame, a corresponding targeting sleeve assembly is typically installed in the positioning hole to guide the drill bit insertion and the installation of the locking nail. The targeting sleeve assembly usually consists of three parts: an inner sleeve, an outer sleeve, and a puncture needle. The inner sleeve provides a channel for drill bit insertion, the outer sleeve provides a channel for the nailing wrench when installing the locking nail, and the puncture needle is used to combine with the other two sleeves, facilitating the insertion of the entire targeting sleeve assembly.

[0003] Currently, in the aiming sleeve assemblies on the market, the inner sleeve and outer sleeve do not have a locking connection mechanism. After they are engaged, they move around with each other. During drilling, the inner sleeve often protrudes, causing the drill bit's penetration depth indication to be distorted. This leads to doctors selecting the wrong length of locking pin, resulting in unstable surgical fixation, causing secondary harm to patients, and providing doctors with an unreliable clinical experience. Utility Model Content

[0004] The purpose of this invention is to provide an aiming sleeve assembly for intramedullary nail positioning to solve the problem of unstable fit between the inner sleeve and the outer sleeve.

[0005] The aiming sleeve assembly for intramedullary nail positioning of this utility model is implemented as follows:

[0006] An aiming sleeve assembly for intramedullary nail positioning, comprising

[0007] A puncture needle with a pointed tip at its front end;

[0008] An inner sleeve is fitted over the outside of the puncture needle. An annular protrusion is provided on the outer wall of the inner sleeve near the rear end, and a cutting groove is provided at the rear end of the inner sleeve in its axial direction.

[0009] An outer sleeve is fitted over the inner sleeve. An annular groove is provided on the inner wall of the outer sleeve near the rear end, and the annular groove cooperates with the annular protrusion.

[0010] Furthermore, the outer ring surface of the annular protrusion is an inclined surface with the front end tilted inward.

[0011] Furthermore, the inner end of the cutting groove is provided with an arc groove.

[0012] Furthermore, the rear end of the inner sleeve is provided with a first protrusion extending towards its outer circumference, and the outer diameter of the first protrusion is larger than the inner diameter of the outer sleeve.

[0013] Furthermore, the rear end of the outer sleeve is provided with a second protrusion extending toward its outer circumferential surface.

[0014] Furthermore, the puncture needle is provided with an end cap at its rear end, and the outer diameter of the end cap is larger than the inner diameter of the inner sleeve.

[0015] Furthermore, a first guide slope is provided at the rear end of the inner hole of the inner sleeve.

[0016] Furthermore, a second guide slope is provided at the rear end of the inner hole of the outer sleeve.

[0017] Furthermore, the front end of the inner sleeve is provided with a first inclined surface that slopes inward, and the inclination angle of the first inclined surface is the same as the inclination angle of the tip.

[0018] Furthermore, the front end of the outer sleeve is provided with a second inclined surface that slopes inward, and the inclination angle of the second inclined surface is the same as the inclination angle of the tip.

[0019] After adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0020] The inner sleeve and outer sleeve of this invention are fitted together by an annular protrusion and an annular groove. Combined with the cutting groove on the inner sleeve, it can effectively prevent the inner sleeve and outer sleeve from moving around, increase the stability of their fit, avoid secondary harm to the patient, and improve the clinical experience of the doctor. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a structural diagram of the aiming sleeve assembly for intramedullary nail positioning according to a preferred embodiment of the present invention;

[0023] Figure 2 A cross-sectional view of the axial direction of the aiming sleeve assembly for positioning the intramedullary nail according to a preferred embodiment of the present invention;

[0024] Figure 3 This is a structural diagram of the puncture needle of the aiming sleeve assembly for intramedullary nail positioning according to a preferred embodiment of the present invention;

[0025] Figure 4 This is a structural diagram of the inner sleeve of the aiming sleeve assembly for intramedullary nail positioning according to a preferred embodiment of the present invention;

[0026] Figure 5 This is a structural diagram from a first-view perspective of the outer sleeve of the aiming sleeve assembly for intramedullary nail positioning according to a preferred embodiment of the present invention;

[0027] Figure 6This is a structural diagram of the outer sleeve of the aiming sleeve assembly for intramedullary nail positioning according to a preferred embodiment of the present invention from a second perspective.

[0028] In the figure: puncture needle 1, tip 11, end cap 12, inner sleeve 2, annular protrusion 21, cutting groove 22, arc groove 23, first boss 24, first guide slope 25, first slope 26, outer sleeve 3, annular groove 31, second boss 32, second guide slope 33, second slope 34. Detailed Implementation

[0029] 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 scope of protection of this utility model.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] like Figure 1-6 As shown, an aiming sleeve assembly for intramedullary nail positioning includes a puncture needle 1, an inner sleeve 2, and an outer sleeve 3. The puncture needle 1 has a tip 11 at its front end. The inner sleeve 2 is fitted over the puncture needle 1, and an annular protrusion 21 is provided on the outer wall of the inner sleeve 2 near its rear end. A cutting groove 22 located in its axial direction is provided at the rear end of the inner sleeve 2. The outer sleeve 3 is fitted over the inner sleeve 2, and an annular groove 31 is provided on the inner wall of the outer sleeve 3 near its rear end. The annular groove 31 cooperates with the annular protrusion 21.

[0032] When the inner sleeve 2 is fitted with the outer sleeve 3, it is inserted from the rear end of the outer sleeve 3. In order to facilitate the fit between the annular protrusion 21 and the annular groove 31, the outer ring surface of the annular protrusion 21 is an inclined surface with the front end sloping inward.

[0033] Correspondingly, the inner wall of the annular groove 31 cooperates with the annular protrusion 21. The bottom of the groove is an inclined surface with the front end tilted towards the axis of the outer sleeve 3. The inclined surface design of the outer ring surface of the annular protrusion 21 can facilitate the insertion of the inner sleeve 2. At the same time, when it cooperates with the annular groove 31, it can lock the inner sleeve 2 and the outer sleeve 3 to prevent them from moving around.

[0034] When the inner sleeve 2 is inserted into the outer sleeve 3, in order to make the inner sleeve 2 have a certain expansion and contraction characteristics, that is, when the inner sleeve 2 is inserted, its rear end can shrink inward to facilitate the insertion operation, after the annular protrusion 21 is assembled into the annular groove 31, the inner sleeve 2 expands back to its original shape, thereby ensuring that the two can be stably matched after the inner sleeve 2 is inserted. Therefore, a cutting groove 22 is provided at the rear end of the inner sleeve 2. In order to make the inner sleeve 2 have a certain expansion and contraction characteristics, an arc groove 23 is provided at the inner end of the cutting groove 22.

[0035] In addition, when the inner sleeve 2 is processed to cut the groove 22, the two side walls of the groove 22 are made to expand outward. In this way, after the groove 22 returns to its natural state, the two side walls will still maintain a certain expansion state. This will not only not affect the fit between the inner sleeve 2 and the outer sleeve 3, but also increase the stability of the fit between the two.

[0036] The circular arc groove 23 increases the elasticity of the rear end of the inner sleeve 2.

[0037] In order to limit the position of the inner sleeve 2 relative to the outer sleeve 3, the rear end of the inner sleeve 2 is provided with a first boss 24 extending to its outer circumference, and the outer diameter of the first boss 24 is larger than the inner diameter of the outer sleeve 3.

[0038] In this embodiment, the first boss 24 is a trapezoidal platform with a small outer diameter at the front end and a large outer diameter at the rear end, and the outer ring surface of the first boss 24 is a concave arc surface.

[0039] To ensure the structural strength of the outer sleeve 3 at the annular groove 31, a second protrusion 32 extending outward from the rear end of the outer sleeve 3 is provided.

[0040] The annular groove 31 is provided inside the second boss 32.

[0041] In this embodiment, the second boss 32 is a trapezoidal platform with a large outer diameter at the front end and a small outer diameter at the rear end, and the outer ring surface of the second boss 32 is a concave arc-shaped surface.

[0042] The concave arc-shaped surfaces on the outer rings of the first and second protrusions are designed to facilitate hand gripping and increase ease of operation during use.

[0043] When the puncture needle 1 is inserted into the inner sleeve 2, the puncture needle 1 can be limited. The rear end of the puncture needle 1 is provided with an end cap 12, the outer diameter of which is larger than the inner diameter of the inner sleeve 2.

[0044] The outer ring surface of the end cap 12 is provided with two concave annular grooves.

[0045] The annular groove design makes it easy to hold and grip, increasing ease of operation during use.

[0046] To facilitate the insertion of the puncture needle 1 into the inner sleeve 2, a first guide slope 25 is provided at the rear end of the inner hole of the inner sleeve 2.

[0047] To facilitate the insertion of the inner sleeve 2 into the outer sleeve 3, a second guide slope 33 is provided at the rear end of the inner hole of the outer sleeve 3.

[0048] During the operation, in order to facilitate the insertion of the entire aiming sleeve assembly, the front end of the inner sleeve 2 is provided with a first inclined surface 26 that is inclined inward, and the inclination angle of the first inclined surface 26 is the same as the inclination angle of the tip 11.

[0049] Similar to the first inclined surface 26, the front end of the outer sleeve 3 is provided with a second inclined surface 34 that is inclined inward, and the inclination angle of the second inclined surface 34 is the same as the inclination angle of the tip 11.

[0050] The tip 11 of the puncture needle 1 can form a complete cone shape with the first bevel 26 and the second bevel 34, thereby ensuring the smooth insertion of the aiming sleeve assembly during the operation.

[0051] This utility model has a simple overall structure, which can achieve a stable fit between the inner sleeve 2 and the outer sleeve 3, avoid the problem of movement, ensure the accuracy of the drill bit insertion depth during surgery, facilitate the selection of locking pins of appropriate specifications to ensure the stability of surgical fixation, avoid secondary damage to patients, and improve the clinical experience of doctors.

[0052] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An aiming sleeve assembly for intramedullary nail positioning, characterized in that, include A puncture needle (1) has a tip (11) at its front end; The inner sleeve (2) is fitted over the outside of the puncture needle (1). The inner sleeve (2) has an annular protrusion (21) on its outer wall near the rear end. The rear end of the inner sleeve (2) has a cutting groove (22) located in its axial direction. The outer sleeve (3) is fitted over the inner sleeve (2). An annular groove (31) is provided on the inner wall of the outer sleeve (3) near the rear end. The annular groove (31) cooperates with the annular protrusion (21).

2. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The outer ring surface of the annular protrusion (21) is an inclined surface with the front end tilted inward.

3. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The inner end of the cutting groove (22) is provided with an arc groove (23).

4. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The inner sleeve (2) has a first boss (24) extending to its outer circumference at its rear end, and the outer diameter of the first boss (24) is larger than the inner diameter of the outer sleeve (3).

5. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The outer sleeve (3) has a second protrusion (32) extending toward its outer circumference at its rear end.

6. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The puncture needle (1) is provided with an end cap (12) at its rear end, and the outer diameter of the end cap (12) is larger than the inner diameter of the inner sleeve (2).

7. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The inner sleeve (2) has a first guide slope (25) at the rear end of its inner hole.

8. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The inner rear end of the outer sleeve (3) is provided with a second guide slope (33).

9. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The inner sleeve (2) has a first inclined surface (26) that is inclined inward at the front end, and the inclination angle of the first inclined surface (26) is the same as the inclination angle of the tip (11).

10. The aiming sleeve assembly for intramedullary nail positioning according to claim 1, characterized in that, The front end of the outer sleeve (3) is provided with a second inclined surface (34) that is inclined inward, and the inclination angle of the second inclined surface (34) is the same as the inclination angle of the tip (11).

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