CN203138612U

CN203138612U - Surgical step drill

Info

Publication number: CN203138612U
Application number: CN 201320169543
Authority: CN
Inventors: 李润泽; 祁潇潇
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-23
Filing date: 2013-03-23
Publication date: 2013-08-21
Anticipated expiration: 2023-03-23

Abstract

The utility model relates to a surgical step drill which is of a step drill structure. A working portion of the surgical step drill is divided into three portions which are respectively a guiding portion, a transition portion and a broaching portion, wherein a twist drill is the main body of the guiding portion. Diamond abrasive particles are arranged on the spiral surfaces of the transition portion and the broaching portion in a braze-welding mode. The surgical step drill not only prolongs the service life of cutters and surface quality of drilling holes, but also improves machining efficiency, shortens broaching time, reduces temperature rise in the broaching process, ensures sufficient scrap accommodating space, can be prevented from being clogged, timely discharges scraps, and takes generated heat away. According to the surgical step drill, cutting edges of a bone drill are replaced by the diamond abrasive particles to finish hole-drilling operation. Therefore, the surgical step drill can greatly reduce drilling force, and reduces drilling temperatures.

Description

A kind of surgical operation subland drill

Technical field

This utility model relates to a kind of medical apparatus and instruments, is specially a kind of surgical operation subland drill.

Background technology

When the surgical operation bone drilling, may cause temperature to raise owing to plastic deformation and the frictional force between drill bit and bone of bone fragments.May cause osteonecrosis in the bone drilling process, the osteocyte of boring adjacent domain can cause permanent death when surpassing 50 ℃ of marginal values owing to borehole temperature.In order to reduce borehole temperature, boring procedure has prevented that as far as possible soon heat is passed in the bone adjacent tissue.By increasing axial force penetration rate is improved.Yet axial force is excessive, may cause the raising of patient's further fracture and drilling temperature.Drilling parameter is adjusted axial force and borehole temperature obviously can not tackle the problem at its root by changing.

Summary of the invention

The purpose of this utility model is: a kind of surgical operation subland drill is provided, drill bit adopts the step drill structure, the working portion of drill bit is divided into three parts, first is targeting part, its main body is fluted drill, second portion is transition portion, and third part is the reaming part, braze welding diamond abrasive grain on the helical surface of transition portion and reaming part.Can significantly improve cutter life, bone drilling surface quality and operation efficient, shorten operating time, thereby reduced the temperature rise of bone drilling process.Diamond abrasive grain is designed to two row, and the exposed 70%-80% that highly accounts for whole abrasive particle height of single abrasive particle guarantees that drill bit has enough chip spaces, prevents that drill bit from stopping up and the timely scrap fallaway of energy, takes away the heat of generation, reduces temperature rise.

Above-mentioned purpose is realized by following technical scheme: develop a kind of surgical operation subland drill, drill bit is the step drill shape, the working portion of drill bit is divided into three parts, first is targeting part, its main body is fluted drill, second portion is transition portion, and third part is the reaming part, braze welding diamond abrasive grain on the helical surface of transition portion and reaming part.

The total length L of described drill bit ₄, working portion length is l ₄, the working portion l of drill bit ₄Be divided into three sections; Drill bit is selected rustless steel for use, and drill tip is the drillstock part, adopts the staight shank shape.Manufacture process: be d with diameter at first ₄The rustless steel cylinder process three parts of working portion, partly process thread groove, helixangle at transition portion and reaming then ₄Scope is between 18 °-30 °; The targeting part l of working portion ₀₄Be the standard fluted drill, outside diameter d ₀₄Scope is at 1mm-5mm, drift angle 2 φ of drill bit ₄Excursion between 90 °-120 °, helixangle ₄Scope is between 18 °-30 °, and the anterior angle of drill bit obtains maximal rake angle γ in external diameter edge ₄=30 °, the relief angle of drill bit is obtaining maximum α near the chisel edge place ₄=20 °-26 °; The transition portion l of working portion ₁₄With reaming part l ₂₄Be used for carrying out braze welding diamond abrasive grain, wherein transition portion l ₁₄Length can suitably adjust according to bit diameter size; Diamond abrasive grain is designed to two row, and the granularity of diamond abrasive grain difference is as required selected 20#-80# for use, the average diameter D of drill bit behind the soldering abrasive particle ₄Scope is determined at 2mm-10mm; Line-spacing H between the abrasive particle ₄With row apart from h ₄Scope is between 2-3 abrasive particle particle diameter doubly.

The beneficial effects of the utility model are: the targeting part of drill bit is thin fluted drill part, and the anterior angle of drill bit obtains maximal rake angle γ in external diameter edge ₄=30 °, make cutting edge sharper, reduced axial force, the relief angle of drill bit is obtaining maximum α near the chisel edge place ₄=20 °-26 °, effectively reduced the friction of knife face and machined surface behind the drill bit, reduce the generation of frictional heat, thereby reduced the temperature rise of boring procedure; The drill bit transition portion is a conical transition stage, can reduce drill bit to the injury of bone surrounding tissue; Reamer is divided into the thread groove stage of fixed diameter, is mainly the reaming function, can process thicker osseous tissue and the bigger boring of processing, and the form of this step drill can effectively reduce the temperature rise of boring procedure; Braze welding diamond on transition portion and the reaming part matrix surface, and the controlled ordered arrangement of realization diamond abrasive grain, soldering two row diamond abrasive grains, and with the line-spacing of abrasive particle and row apart from control between 2-3 times of abrasive particle particle diameter, cutter life and boring surface quality have so not only been prolonged, and improved working (machining) efficiency, shorten drilling time, thereby reduced the temperature rise of boring procedure; The exposed height of diamond abrasive grain can reach 70%-80%, and with the line-spacing of abrasive particle and row apart from control between 2-3 times of abrasive particle particle diameter, guarantee that drill bit has enough chip spaces, prevent that drill bit from stopping up and timely scrap fallaway, take away the heat of generation, reduce temperature rise; The control of the helical angle of helical flue of drill can guarantee that smear metal can in time discharge smoothly between 18 °-30 °, take away heat, reduces temperature rise; This cutting edge with diamond abrasive grain replacement bone drill is finished drilling operation, can reduce drill thrust greatly, thereby reduce the drilling temperature.

Description of drawings

Fig. 1 is the surgical operation subland drill;

Fig. 1 a is the apex point structure chart;

Fig. 1 b is the apex point construction profile;

Fig. 1 c is Fig. 1 partial enlarged drawing I;

Fig. 1 d is that the D-D of Fig. 1 is to view;

Fig. 1 e is the partial enlarged drawing II of Fig. 1 d.

The specific embodiment

Be described further below in conjunction with accompanying drawing and this utility model of embodiment.

Shown in Fig. 1, Fig. 1 a-1e, surgical operation subland drill shape is similar to step drill, the total length L of drill bit ₄, working portion length is l ₄, the working portion l of drill bit ₄Can be divided into three parts.Drill bit material is selected rustless steel for use, and drill tip is the drillstock part, adopts the staight shank shape.Its processing method: be d with diameter at first ₄The rustless steel cylinder process three parts of working portion, partly process thread groove, helixangle at transition portion and reaming then ₄Scope is between 18 °-30 °.Targeting part l with working portion ₀₄Be processed as the standard fluted drill, its form parameter is identical with standard fluted drill parameter, outside diameter d ₀₄Scope is at 1mm-5mm, drift angle 2 φ of drill bit ₄Excursion between 90 °-120 °, helixangle ₄Scope is between 18 °-30 °, and the anterior angle of drill bit obtains maximal rake angle γ in external diameter edge ₄=30 ° of (N ₄-N ₄Section), the relief angle of drill bit is obtaining maximum α near the chisel edge place ₄=20 ° of-26 ° of (O ₄-O ₄Section), this thin fluted drill part can reduce axial force, thereby reduces the temperature rise of boring procedure.The transition portion l of working portion ₁₄With reaming part l ₂₄Thread groove be used for carrying out braze welding diamond abrasive grain, wherein transition portion l ₁₄Can reduce drill bit to the injury of surrounding tissue, length can suitably be adjusted according to the bit diameter size.Then to the transition portion l of working portion ₁₄With reaming part l ₂₄Carry out the controlled braze welding diamond abrasive grain of arranging, this controlled arranging not only prolonged cutter life and boring surface quality, and improved working (machining) efficiency, shortened drilling time, thereby reduced the temperature rise of boring procedure.Diamond abrasive grain is designed to two row, and the exposed 70%-80% that highly accounts for whole abrasive particle height of single abrasive particle controls line-spacing H between the abrasive particle artificially with controlled method of arranging manufacturing ₄With row apart from h ₄Scope is between 2-3 abrasive particle particle diameter doubly, and these guarantee that all drill bit has enough chip spaces, prevents that drill bit from stopping up and the timely scrap fallaway of energy, takes away the heat of generation, reduces temperature rise.According to the matrix diameter d that adopts ₄Exposed height h with single abrasive particle _T4, can be with the average diameter D of drill bit behind the soldering abrasive particle ₄Scope is determined at 2mm-10mm.The granularity of diamond abrasive grain difference as required can be selected 20#-80# for use.

Claims

1. surgical operation subland drill, drill bit adopts the step drill structure, the working portion of drill bit is divided into three parts, first is targeting part, its main body is fluted drill, second portion is transition portion, and third part is the reaming part, braze welding diamond abrasive grain on the helical surface of transition portion and reaming part.

2. surgical operation subland drill as claimed in claim 1 is characterized in that, the total length L of described drill bit ₄, working portion length is l ₄, the working portion l of drill bit ₄Be divided into three parts; Drill bit is selected rustless steel for use, and drillstock partly adopts the staight shank shape: be d with diameter at first ₄The rustless steel cylinder process three parts of working portion, partly process thread groove at transition portion and reaming then, helixangle ₄Scope is between 18 °-30 °; The targeting part l of working portion ₀₄Be the standard fluted drill, outside diameter d ₀₄Scope is at 1mm-5mm, drift angle 2 φ of drill bit ₄Excursion between 90 °-120 °, helixangle ₄Scope is between 18 °-30 °, and the anterior angle of drill bit obtains maximal rake angle γ in external diameter edge ₄=30 °, the relief angle of drill bit is obtaining maximum α near the chisel edge place ₄=20 °-26 °; The transition portion l of working portion ₁₄With reaming part l ₂₄Be used for carrying out braze welding diamond abrasive grain, wherein transition portion l ₁₄Length is suitably adjusted according to the bit diameter size.

3. surgical operation subland drill as claimed in claim 2 is characterized in that, described diamond abrasive grain is designed to two row, and the granularity of diamond abrasive grain difference is as required selected 20#-80# for use, the average diameter D of drill bit behind the soldering abrasive particle ₄Scope is determined at 2mm-10mm; Line-spacing H between the abrasive particle ₄With row apart from h ₄Scope is between 2-3 abrasive particle particle diameter doubly.