WO2021218276A1

WO2021218276A1 - Self-tapping bone pin

Info

Publication number: WO2021218276A1
Application number: PCT/CN2021/075438
Authority: WO
Inventors: 杨华清; 唐佩福; 章耀华; 李强; 黄晓宇; 彭爱民; 郑学建; 夏雨; 金圣爱; 吴鸿鹰; 唐金树
Original assignee: 北京骨外固定技术研究所
Priority date: 2020-04-28
Filing date: 2021-02-05
Publication date: 2021-11-04
Also published as: CN111493992A; CN111493992B

Abstract

Disclosed is a self-tapping bone pin, comprising a pin body portion and a pin tip portion, wherein the pin tip portion is provided with a first pin tip section structure and a second pin tip section structure; the first pin tip section structure comprises a main cutting flat face which extends from the tip of the pin tip portion in the axis direction of the bone pin; the second pin tip section structure comprises an auxiliary cutting face which extends from the tip of the pin tip portion and intersects with the main cutting flat face to form an acute angle; the main cutting flat face intersects with the auxiliary cutting face to form a cutting edge for cutting a bone; and the pin body portion is provided with a pin body section which extends from the end of the main cutting flat face and forms an included angle greater than 90 degrees with the main cutting flat face. The technical problem to be solved by the present invention is to overcome the disadvantage of the low operation efficiency of existing bone pins, and to provide a self-tapping bone pin capable of reducing the steps of surgery.

Description

A self-tapping bone spicule

Technical field

The invention relates to the field of medical equipment. Specifically, it is a self-tapping bone spicule.

Background technique

Bone pin is an indispensable medical device in orthopedic surgery. It is used for temporary or long-term fixation of the fracture site. Traditional Kirschner wires, semi-threaded pins and screws need to be drilled in the bone first, and then the bone The needle penetrates the bone. This leads to more procedures and lower efficiency, which makes the operation time longer.

Summary of the invention

The technical problem solved by the present invention is to overcome the shortcomings of low surgical efficiency caused by the existing bone needles, and to provide a self-tapping bone needle that can reduce surgical steps.

The self-tapping bone needle of the present invention includes a needle body portion and a needle tip portion. The needle tip portion is provided with a first needle tip cross-sectional structure and a second needle tip cross-sectional structure. The main cutting plane extending in the axial direction of the bone needle, the second needle tip cross-sectional structure includes a secondary cutting surface extending at an acute angle from the tip of the needle tip portion to intersect the main cutting plane, and the main cutting plane intersects the secondary cutting surface A cutting edge constituting a cutting bone, the needle body portion is provided with a needle body section, the needle body section extends from the end of the main cutting plane, and the formation between the needle body section and the main cutting plane is greater than or equal to 90 ° of the angle α.

Preferably, the included angle α between the needle section and the main cutting plane is 90°-135°.

Preferably, the included angle α between the needle section and the main cutting plane is 135°.

Preferably, the secondary cutting surface is a flat surface, and the included angle with the axis of the bone spicule is 25°-75°.

Preferably, the needle tip portion is provided with a main cutting plane and a plurality of secondary cutting surfaces, and two secondary cutting surfaces of the plurality of secondary cutting surfaces intersect with the main cutting plane respectively to form a cutting edge.

Preferably, the needle tip portion is provided with a main cutting plane and two secondary cutting surfaces, and the two secondary cutting surfaces intersect with the main cutting plane to form two cutting edges.

Preferably, the included angle β between the two cutting edges is 60°-145°.

Preferably, the two secondary cutting surfaces intersect and are symmetrical with respect to the symmetry plane passing through the intersection line of the intersection of the two secondary cutting surfaces and the axis of the bone pin.

Preferably, the angle γ between the intersection line of the two secondary cutting surfaces and the cutting edge is 25°-85°.

Preferably, the needle body part is provided with a thread at a position close to the needle tip part.

Preferably, the thread extends to the tip of the needle, and the thread avoids the main cutting plane, the secondary cutting surface and the cross section of the needle body.

Compared with the prior art, the self-tapping bone needle of the present invention has the following beneficial effects:

The main cutting plane and the secondary cutting surface of the self-tapping bone needle of the present invention intersect to form a cutting edge for cutting bones. When the bone needle is inserted into the bone, there is no need to drill an eye with a drill bit, but the self-tapping bone needle itself is used to drill the eye , The self-tapping bone needle drilled into the bone stays in the bone to play a fixed role, thereby eliminating the step of drilling the eye and saving the procedure and time of the operation. At the same time, an included angle greater than or equal to 90° is formed between the cross section of the needle body and the cross section of the first needle tip, so that the bone debris generated by cutting can flow out along the inclined surface of the included angle.

Description of the drawings

Fig. 1 is a schematic front view of a self-tapping bone needle according to an embodiment of the present invention.

Fig. 2 is a schematic top view of a self-tapping bone needle according to an embodiment of the present invention.

Fig. 3 is a schematic left view of a self-tapping bone needle according to an embodiment of the present invention.

Fig. 4 is a schematic front view of a self-tapping bone needle according to another embodiment of the present invention.

Reference number

1 main cutting plane, 2 secondary cutting surfaces, 3 needle profile, 4 threads.

Detailed ways

Fig. 1 is a schematic front view of a self-tapping bone needle according to an embodiment of the present invention, and Fig. 2 is a schematic top view of a self-tapping bone needle according to an embodiment of the present invention. As shown in Figure 1, a self-tapping bone needle provided by the present invention includes a needle body and a needle tip. The bone needle is provided with a first needle tip cross-sectional structure and a second needle tip extending from the tip of the needle tip. The cross-sectional structure of the first needle tip includes a main cutting plane 1 extending from the tip of the needle tip along the axis of the bone needle. The planes intersect to form a secondary cutting surface extending at an acute angle. In this embodiment, the secondary cutting surface is a flat surface. In other embodiments, the secondary cutting surface may also be an arc-shaped surface. In this embodiment, in the direction of the axis, the size of the main cutting plane is larger than the size of the secondary cutting surface. The main cutting plane 1 and the secondary cutting surface 2 intersect to form a cutting edge for cutting bones, and the needle body of the bone needle The section is provided with a needle section 3 which extends from the end of the main cutting plane 1 and forms an included angle α greater than or equal to 90° between the needle section 3 and the main cutting plane 1. In this embodiment, the needle section 3 is a plane.

The main cutting plane 1 and the secondary cutting surface 2 of the self-tapping bone needle of the present invention intersect to form a cutting edge for cutting the bone. When the bone needle is inserted into the bone, there is no need to drill an eye with a drill, but the self-tapping bone needle itself Drilling, the self-tapping bone needle drilled into the bone stays in the bone to play a fixed role, thereby eliminating the step of drilling the eye with the drill bit and saving the procedure and time of the operation. At the same time, an included angle α greater than 90° is formed between the needle section 3 and the main cutting plane 1, which can make the bone debris generated by cutting flow out along the inclined plane of the included angle, and then can be easily taken out.

Preferably, the angle α between the needle section 3 and the main cutting plane 1 is 90-135°.

In this embodiment, the angle α between the needle section 3 and the main cutting plane 1 is 135°.

In the axial direction, the size of the main cutting plane 1 is greater than or equal to the length of the needle tip. In this embodiment, as shown in FIGS. 1 and 2, the length of the main cutting plane 1 is slightly larger than the length of the needle tip. .

As a preferred solution, the included angle between the secondary cutting surface 2 and the axis of the spicule (not shown in the figure) is 25°-75°.

The needle tip portion is provided with a main cutting plane and a plurality of secondary cutting surfaces, and two secondary cutting surfaces of the multiple secondary cutting surfaces intersect with the main cutting plane to form a cutting edge, and the clamping between the two cutting edges The angle β is 60°-145°, and the angle γ between the intersection line of the two secondary cutting surfaces and the cutting edge is 25°-85°.

As shown in Figures 1-3, in this embodiment, the needle tip portion is provided with one main cutting plane 1 and two secondary cutting surfaces 2. The two secondary cutting surfaces 2 have the same shape and the same area. One secondary cutting surface 2 intersects with the main cutting plane 1 to form a first cutting edge, and the other secondary cutting surface 2 intersects with the main cutting plane 1 to form a second cutting edge. The two cutting edges can cut in different directions of rotation. .

Figure 4 shows a second embodiment of the present invention. In this embodiment, the needle body is provided with a thread 4 near the tip of the needle. The thread 4 extends to the tip of the needle. The thread 4 can make a bone needle It is more firmly fixed inside the bones. The thread 4 avoids the main cutting plane 1, the secondary cutting surface 2 and the needle section 3. The other technical features in this embodiment are the same as the embodiment shown in FIGS. 1-3.

In other implementations, the needle tip portion is provided with a main cutting plane and three or four or five secondary cutting surfaces, and the number of secondary cutting surfaces can be determined according to actual needs.

The above embodiments are only exemplary embodiments of the present invention, and are not used to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications or equivalent substitutions made by those skilled in the art to the present invention within the essence and protection scope of the present invention also fall within the protection scope of the present invention.

Claims

A self-tapping bone needle, comprising a needle body part and a needle tip part, wherein the needle tip part is provided with a first needle tip cross-sectional structure and a second needle tip cross-sectional structure, and the first needle tip cross-sectional structure includes a tip from the needle tip part The main cutting plane extending along the axis of the bone needle, the second needle tip cross-sectional structure includes a secondary cutting surface extending at an acute angle from the tip of the needle tip portion to the main cutting plane, the main cutting plane and the secondary cutting plane The cutting surfaces intersect to form a cutting edge for cutting bones. The needle body portion is provided with a needle body section that extends from the end of the main cutting plane, and the section between the needle body section and the main cutting plane is greater than Or equal to the included angle α of 90°.
The self-tapping bone needle according to claim 1, wherein the angle α between the needle body section and the main cutting plane is 90°-135°.
The self-tapping bone needle according to claim 2, wherein the angle α between the needle body section and the main cutting plane is 135°.
The self-tapping bone needle according to claim 1, wherein the secondary cutting surface is a plane, and the included angle with the axis of the bone needle is 25°-75°.
The self-tapping bone needle according to claim 1, wherein the tip portion is provided with a main cutting plane and a plurality of auxiliary cutting surfaces, and two auxiliary cutting surfaces of the plurality of auxiliary cutting surfaces are connected to the main cutting surface. The cutting planes intersect respectively to form a cutting edge.
The self-tapping bone needle according to claim 1, wherein the tip portion is provided with a main cutting plane and two secondary cutting surfaces, and the two secondary cutting surfaces intersect with the main cutting plane to form two cutting surfaces. blade.
The self-tapping bone needle according to claim 1, wherein the angle β between the two cutting edges is 60°-145°.
The self-tapping bone needle according to claim 6, wherein the two secondary cutting surfaces intersect and are symmetrical with respect to a symmetry plane passing through the intersection line of the intersection of the two secondary cutting surfaces and the axis of the bone needle.
The self-tapping bone needle according to claim 8, wherein the angle γ between the intersection line of the two secondary cutting surfaces and the cutting edge is 25°-85°.
The self-tapping bone needle according to any one of claims 1-9, wherein the needle body portion is provided with a thread at a position close to the needle tip portion.
The self-tapping bone needle according to claim 10, wherein the thread extends to the tip of the needle, and the thread avoids the main cutting plane, the secondary cutting surface, and the cross section of the needle body.