阅读说明：本技术 一种铰刀 (Reamer bit ) 是由 王成勇 *** 陈志桦 于 2018-06-20 设计创作，主要内容包括：本发明涉及一种医疗器械,具体涉及一种髓腔扩髓用的铰刀,包括刀体,第一切屑刃和第二切屑刃,所述第一切屑刃包括设置在所述刀体的侧面并沿刀体的长度方向平行分布的若干个切削刃,所述第二切削刃设置在所述刀体的前端,所述刀体为中空结构。空心结构能够大块切除并整体收集股骨髓腔内的松质骨和骨髓,比多次使用铰刀扩髓的碎屑收集效果更好,能够实现钻孔、扩孔一体化,一次实现扩髓功能。(The invention relates to a medical instrument, in particular to a reamer for reaming medullary cavity, which comprises a cutter body, a first cutting blade and a second cutting blade, wherein the first cutting blade comprises a plurality of cutting blades which are arranged on the side surface of the cutter body and distributed in parallel along the length direction of the cutter body, the second cutting blade is arranged at the front end of the cutter body, and the cutter body is of a hollow structure. The hollow structure can cut off in large blocks and integrally collect cancellous bone and marrow in the femoral bone marrow cavity, has better debris collecting effect than reaming with a reamer for many times, can realize the integration of drilling and reaming, and realizes the reaming function at one time.)

1. A reamer, characterized in that: including cutter body, first cutting edge and second cutting edge, first cutting edge is including setting up a plurality of cutting edge of the length direction parallel distribution of cutter body is followed to the side of cutter body, the second cutting edge sets up the front end of cutter body, the cutter body is hollow structure.

2. The reamer of claim 1 wherein: the cutter body still includes first appearance bits portion and chip groove, first appearance bits portion comprises rake face and vice plane contained angle, first appearance bits portion with cutter body hollow structure communicates with each other and forms the chip groove.

3. The reamer of claim 1 wherein: the vertical projection profile of the first cutting edge is conical, and the taper is 1-5 degrees.

4. The reamer of claim 1 wherein: the number of the first cutting edges is 3-7.

5. The reamer of claim 1 wherein: the rake angle of the first cutting edge is a negative rake angle.

6. The reamer of claim 1 wherein: the second cutting edge is a continuous annular cutting edge or a serrated cutting edge.

7. The reamer of claim 2 wherein: the number of the chip grooves is equal to that of the first cutting edges.

8. A reamer according to any one of claims 1 to 7 wherein: the tail end of the cutter body is provided with a connecting end connected with a motor.

9. The reamer of claim 8 wherein: the connecting end is of a hollow structure and is communicated with the cutter body.

Technical Field

The invention relates to a medical instrument, in particular to a reamer for reaming a medullary cavity.

Background

The medullary cavity reamer is mainly used for reaming the medullary cavity of the femur and has the specification of 9-16 mm. The current reaming solutions are primarily directed to the gradual enlargement of the medullary cavity by using reamers of the medullary cavity from small to large sizes. The gradual reaming process brings problems, for example, the rotation axis of the reamer is inconsistent in the process of using the reamer for multiple times, so that the installation cavity of the prosthesis is overlarge, and the installation cavity is not aligned in size and position; multiple manipulations add time to the procedure and also add risk of surgical error.

In addition, the conventional medullary cavity reamer generally generates large intramedullary pressure to the medullary cavity by using a medullary opening drill or directly reaming the medullary cavity for the first time, so that a series of postoperative problems such as vein embolism and the like are caused.

Disclosure of Invention

In order to solve the problems, the invention provides a reamer which can complete medullary cavity reaming at one time, and can reduce the intramedullary pressure and less chip residue in the medullary cavity reaming process.

The invention adopts the following technical scheme: the utility model provides a reamer, includes cutter body, first cutting edge and second cutting edge, first cutting edge is including setting up a plurality of cutting edge at the side of cutter body and along the length direction parallel distribution of cutter body, the second cutting edge sets up the front end at the cutter body, the cutter body is hollow structure.

Further, the cutter body still includes first appearance bits portion and chip groove, first appearance bits portion comprises rake face and vice plane contained angle, first appearance bits portion with cutter body hollow structure communicates with each other and forms the chip groove.

Preferably, the vertical projection profile of the first cutting edge is conical, and the taper is 1-5 degrees.

Preferably, the number of the first cutting edges is 3-7, preferably even number, and the first cutting edges are symmetrically distributed.

Preferably, the first cutting edge is a straight edge and the rake angle is a negative rake angle.

Preferably, the second cutting edge is a continuous annular cutting edge or a serrated cutting edge.

Preferably, the number of flutes is equal to the number of first cutting edges.

Preferably, the tail end of the cutter body is provided with a connecting end connected with a motor.

Preferably, the connecting end is of a hollow structure and is communicated with the hollow structure of the cutter body.

The invention has the beneficial effects that: set up the cutter body for hollow structure in this scheme, do not produce the extrusion to cancellous bone and bone marrow, at rotatory in-process, hollow structure's inner wall also can play the stable effect of rotational positioning. Meanwhile, the reamer with the hollow structure only cuts femoral medullary cavities in small areas of the cutting edges on the side surface and the end surface, the total cutting amount is small, the cutting force is small, and excessive cutting heat cannot be generated. When the hollow reamer is used for cutting, the required cutting force is smaller, and the overall cutting force is not influenced. And the cut of the end face cutting edge is completely collected in the hollow structure, so the chip collecting effect is better than that of the prior art. The medullary cavity is reamed at one time, the intramedullary pressure in the reaming process can be reduced, and the residual cuttings are less.

Drawings

The figures further illustrate the invention, but the examples in the figures do not constitute any limitation of the invention.

FIG. 1 is a view of a reamer configuration;

FIG. 2 is a top view of the reamer;

in the figure: the cutter body 1, first cutting edge 2, second cutting edge 3, link 4, rake 11, subplanar 12, first chip-receiving portion 13, chip groove 14.

Detailed Description