Metal spicule

Abstract

The utility model relates to the field of external fixation medical instruments, in particular to a metal bone needle. According to the metal bone needle, one side of the auxiliary cutting face of the cutting head intersects with the main cutting face to form the main cutting edge, the other side of the auxiliary cutting face intersects with the conical face to form the auxiliary cutting edge, the angle of the auxiliary cutting edge is larger than that of the main cutting edge through the structure, and in other words, the sharpness of the main cutting edge is larger than that of the main cutting edge. The main cutting edge firstly cuts a bone, then the auxiliary cutting edge cuts the bone, so that the auxiliary cutting edge can perform secondary fine cutting on the hole wall of a drill hole, the drilling quality is improved, meanwhile, the conical surface is arranged on the cutting head, and the conical surface is in contact with the hole wall of the drill hole to realize positioning in the drilling process, so that the bone needle is prevented from vibrating, and the drilling quality is improved. And the drilling process is stable.

Description

Technical Field

[0001] This utility model relates to the field of external fixation medical devices, specifically to a metal bone needle. Background Technology

[0002] In the field of external fixation medical devices, metal bone pins are a fundamental instrument, primarily used to connect bones to external fixators. The head of a bone pin typically has a cutting edge for drilling holes in the bone. The structure of the cutting edge varies, with the main consideration being drilling efficiency. Chinese patent document CN 111493992 B discloses a bone pin whose head includes a main cutting surface and two secondary cutting surfaces, forming a pyramidal structure. It also features a pin body cross-section to facilitate the removal of bone fragments. However, this bone pin still suffers from the following problem during use: the pyramidal structure causes vibration during drilling, leading to instability in the drilling process. Utility Model Content

[0003] This invention provides a metal bone needle to solve the problem of low drilling efficiency of existing metal bone needles.

[0004] A metal bone needle includes a body, with a cutting head at one end of the body. The cutting head has a tapered surface and a main cutting surface extending along the length of the body. The main cutting surface has a triangular structure. A secondary cutting surface is located near the main cutting surface on the tapered surface. One side of the secondary cutting surface intersects the main cutting surface to form a main cutting edge, and the other side intersects the tapered surface to form a secondary cutting edge. The secondary cutting edge is located behind the main cutting edge in the rotation direction of the bone needle.

[0005] The body is provided with a flat guide portion, and the cutting head is located at the end of the guide portion.

[0006] The cross-section of the guide portion is semi-circular, and the planar portion of the guide portion is coplanar with the main cutting surface.

[0007] A guide slope is provided at the connection position between the guide part and the body.

[0008] The secondary cutting surfaces are symmetrically arranged on the cutting head.

[0009] The beneficial effects of this utility model are as follows: one side of the secondary cutting surface of the cutting head of the metal bone needle of this utility model intersects with the main cutting surface to form the main cutting edge, and the other side intersects with the conical surface to form the secondary cutting edge. This structure makes the angle of the secondary cutting edge greater than that of the main cutting edge, that is, the sharpness of the main cutting edge is greater than that of the main cutting edge. During drilling, the main cutting edge first cuts the bone, and then the secondary cutting edge cuts again. In this way, the secondary cutting edge can perform secondary fine cutting on the borehole wall, improving the drilling quality. At the same time, the cutting head is provided with a conical surface. During the drilling process, the conical surface contacts the borehole wall to achieve positioning, thereby avoiding vibration of the bone needle and stabilizing the drilling process. 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of the metal bone needle of this utility model;

[0012] Figure 2 for Figure 1 A magnified view of a portion of the cutting head;

[0013] Figure 3 for Figure 1 The right view;

[0014] Figure 4 for Figure 1 A first-person perspective stereoscopic view;

[0015] Figure 5 for Figure 1 A first-person perspective stereoscopic view;

[0016] Figure 6 for Figure 5 A magnified view of a portion of the cutting head;

[0017] In the figure: 1. Body; 2. Guide slope; 3. Guide part; 4. Conical surface; 5. Secondary cutting surface; 6. Main cutting surface; 51. Main cutting edge; 52. Secondary cutting edge. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Examples of the metal bone needles of this utility model, such as... Figures 1 to 6 As shown, a metal bone needle includes a body 1. A cutting head is provided at the end of the body 1. The end of the cutting head has a conical surface 4 and a main cutting surface 6 extending along the length of the body. The main cutting surface 6 has a triangular structure. A secondary cutting surface 5 is provided near the main cutting surface on the conical surface 4. One side of the secondary cutting surface intersects with the main cutting surface to form a main cutting edge 51, and the other side intersects with the conical surface to form a secondary cutting edge 52. The secondary cutting edge 52 is located behind the main cutting edge 51 in the direction of bone needle rotation. This ensures that when the bone needle rotates, the main cutting edge cuts first, and the secondary cutting edge then performs secondary cutting on the hole wall. The main cutting surface, the secondary cutting surface, and the conical surface form the cutting head, giving it a conical structure.

[0020] In this embodiment, the body 1 is provided with a flat guide portion 3, and the cutting head is located at the end of the guide portion 3. The guide portion 3 facilitates the discharge of chips during the cutting process. At the same time, the presence of the guide portion ensures that the bone needle does not completely occupy the drill hole during drilling, leaving some space. This space is just enough to accommodate bone chips, which are temporarily stored in this space. As the bone needle advances forward, the bone chips are pushed out of the drill hole, preventing bone chips from remaining in the bone. Removing bone chips can greatly improve drilling quality because if bone chips are not effectively removed, they will increase the friction of the drill bit, causing the temperature of the drill bit and the bone in contact with it to rise, which can easily lead to bone cell necrosis (bone necrosis occurs at around 50°C). Specifically, the guide portion 3 has a semi-circular cross-section, and the planar portion of the guide portion 3 is coplanar with the main cutting surface 6, which reduces the machining difficulty. In other embodiments, the planar portion of the guide portion 3 and the main cutting surface 6 can also be connected by a spiral curved surface or by an inclined surface. Furthermore, the guide portion 3 can also be configured as an integrally spiral structure.

[0021] In this embodiment, a guide slope 2 is provided at the connection position between the guide part 3 and the body 1. In other embodiments, the body 1 and the guide part 3 can also be directly connected by a step or by a curved surface. Alternatively, the guide part 3 can be omitted, and the guide slope 2 can be directly connected to the cutting head.

[0022] The secondary cutting surfaces 5 are symmetrically arranged on the cutting head, which allows the bone needle to rotate in two directions, improving ease of use.

[0023] The cutting head of this utility model has a secondary cutting surface on one side that intersects with the main cutting surface to form the main cutting edge, and on the other side that intersects with the conical surface to form the secondary cutting edge. This structure makes the angle of the secondary cutting edge greater than that of the main cutting edge, meaning that the sharpness of the main cutting edge is greater than that of the main cutting edge. During drilling, the main cutting edge first cuts the bone, and then the secondary cutting edge cuts it again. In this way, the secondary cutting edge can perform secondary fine cutting on the borehole wall, improving the drilling quality. At the same time, the cutting head is provided with a conical surface. During the drilling process, the conical surface contacts the borehole wall to achieve positioning, thereby avoiding vibration of the bone needle and stabilizing the drilling process.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A metal bone needle, characterized in that: The device includes a body, with a cutting head at one end. The cutting head has a tapered surface and a main cutting surface extending along the length of the body. The main cutting surface has a triangular structure. A secondary cutting surface is located near the main cutting surface on the tapered surface. One side of the secondary cutting surface intersects with the main cutting surface to form a main cutting edge, and the other side intersects with the tapered surface to form a secondary cutting edge. The secondary cutting edge is located behind the main cutting edge in the rotation direction of the bone needle. The secondary cutting surfaces are symmetrically arranged on the cutting head.

2. The metal bone needle according to claim 1, characterized in that: The body is provided with a flat guide portion, and the cutting head is located at the end of the guide portion.

3. A metal bone needle according to claim 2, characterized in that: The cross-section of the guide portion is semi-circular, and the planar portion of the guide portion is coplanar with the main cutting surface.

4. A metal bone needle according to claim 3, characterized in that: A guide slope is provided at the connection position between the guide part and the body.

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