Medical cutting tool, its guide member, and cut bone sampling tool

Abstract

Intended is to provide a medical cutting tool, which can recover chips produced by the cutting action, thereby to form a hole for inserting an implant stably therethrough. The medical cutting tool comprises a supporting member (1) and a cutting member (2). This cutting member (2) has a cutting portion (21) formed at one end portion of a cylindrical body portion (20), and the cutting portion (21) has cutting edges (23) extended radially from the center axis of the body portion (20) toward the outer circumference. A center tip portion (24) is formed at the central portion, in which the cutting edges (23) are formed, and outer circumference tip portions (25) are formed at the outer circumference end portion. Between the cutting edges (23), inclined side faces (23b) and side faces (23a) of the adjoining cutting edges (23) are formed to intersect in valley shapes, in which inlet portions (26) are so individually formed in the valley-shaped portions as to communicate with the inside of the body portion (20).

Description

technical field [0001] The present invention relates to a medical cutting tool, a guide member and a bone harvesting tool used in dental, oral surgery, orthopedic surgery to perforate a bone to form an insertion hole for transplantation. Background technique [0002] In dental, oral surgery, plastic surgery and other surgical operations, implants such as artificial tooth roots, artificial joints, artificial bones, and fracture treatment tools must be inserted accurately, so as to perforate and form insertion holes in the living bones of the human body in advance. , inserting the implant into the insertion hole for positioning and fixing. [0003] As a medical cutting tool used in this kind of piercing, for example, Patent Document 1 describes a medical hollow drill, which penetrates in the axial direction to form a discharge path for cutting chips generated during the cutting operation, and separates them at regular intervals. A plurality of cutting edges are radially forme...

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Problems solved by technology

In the case of the drill shape described in Patent Document 3, the central part is also cut deeply, so there is also the problem that the living bone must be cut too much.

[0019] In addition, as described in Patent Document 5, the crushed bone can be reused when crushing and removing the severed bone. However, if the internal bone is crushed at the same time as cutting, part of the crushed bone will flow out when it is taken out. waste of living bone that could be reused

In addition, as described in Patent Document 7, when the screw is clamped and twisted, since the bone plug is not partially clamped, the bone plug may be broken in the middle and cannot be cleaned from the bottom surface.

[0020] The guide members described in Patent Documents 8 and 9 use slit-shaped grooves formed in the vertical direction to guide the cutting tool. However, when such a groove is used as a guide surface, the cutting tool can be inserted from the lateral direction and positioned easily. , on the contrary, there is a disadvantage that the cutting tool is easy to swing in the groove during the piercing action, and stable piercing action cannot be performed.

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