CN2582552Y

CN2582552Y - Biodegradable internal fitting bone screw and its mating screw tap and rotary screw

Info

Publication number: CN2582552Y
Application number: CN 02284236
Authority: CN
Inventors: 万涛; 陈晓明; 李世普; 阎玉华; 李建华; 贺建华
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Science and Engineering WUSE; Wuhan University of Technology WUT
Priority date: 2002-11-19
Filing date: 2002-11-19
Publication date: 2003-10-29
Anticipated expiration: 2012-11-19

Abstract

The utility model relates to a biodegradable degradable (adsorbable) internal fixation bone screw made of a high molecular material and composite materials thereof, and a screw cone for tapping and screwing in the bone screw. The biodegradable degradable (adsorbable) internal fixation bone screw comprises a thread, a screw rod, and a screw cap (screw head), wherein the screw head is provided with two rotary holes which are symmetrically distributed by the middle axial line of the bone screw. The screw cone comprises a cone head, a cone rod and a handle. The cone head is matched with the thread of the biodegradable degradable (adsorbable) internal fixation bone screw. A screw cone comprises a cone heads, a cone rod, a handle, and circular fork poles (the circular fork poles are two circular fork poles on the end parts of the cone head which are matched with the screw head of the biodegradable degradable (adsorbable) internal fixation bone screw which is made of a high molecular material and other composite materials). The screw is convenient and simple to operate in an operation, and has the advantages of favorable biocompatibility, no need of secondary operation and convenient generalization and use.

Description

Biodegradable internal fixation bone screw and supporting screw tap thereof with revolve awl

One, technical field

This utility model relates to a kind of biodegradable (can absorb) internal fixation bone screw and matching used instrument thereof.

Two, background technology

In surgical clinical, fracture or treatment of diseases such as bone reparation are adopted bone transplanting, osteotomy, joint fusion, arthrodesis, operation such as orthopedic more, adopt fixing means in the operation usually.At present, being applied to clinical fracture internal fixation generally adopts inside-fixtures such as metallic screw and bone screw of the same race to fix, though the metallic screw fixture has higher mechanical strength, take out fixture-metallic screw but after union of fracture, need carry out second operation, bring secondary misery and financial burden to the patient like this; Though bone fixture of the same race does not need second operation, but the source of bone is generally from body bone and allograph bone, extraction from the body bone will bring new bone damaged and painful to the patient, and the allograph bone fixture easily produces ill symptomses such as individual rejection, and the mechanical strength of bone fixture of the same race in addition is lower; Biodegradable (can absorb) internal fixation bone screw is made up of macromolecular material and composite thereof, has higher mechanical strength, can degrade and be absorbed by the body in vivo, need not second operation.

Three, summary of the invention

At the problems referred to above, the purpose of this utility model provides a kind of biodegradable by macromolecular material and Composite Preparation thereof (can absorb) internal fixation bone screw and supporting instrument thereof.

For realizing purpose of the present invention, the internal fixation bone screw of biodegradable (can absorb) and supporting screw tap thereof with revolve awl, it comprise the internal fixation bone screw made by the macromolecular material of biodegradable (can absorb) and composite thereof (be called for short: bone screw), and the supporting screw tap that is used for tapping (be called for short: screw tap) and be used to screw in bone screw revolve awl (abbreviation: revolve awl); Described bone screw comprise screw thread, screw rod and nut (be called for short: three parts ailhead), ailhead make be on the ailhead of circle with the two turn holes that are symmetrically distributed, screw axis, with a word groove of common metal screw ailhead tangible difference is arranged; Described screw tap comprises conehead, awl bar and handle, and the screw thread of the internal fixation bone screw of conehead screw thread and biodegradable (can absorb) is complementary; The described awl that revolves is made up of conehead, awl bar, handle and circle crutch, and there is the round crutch that is complementary with bone screw ailhead two turn holes the end of conehead.

In biodegradable of the present invention (can absorb) internal fixation bone screw and the kit thereof, screw has excellent biological compatibility, and can degrade voluntarily after screw implants need not second operation; The ailhead structural design of internal fixation screw, be that intensity according to biodegradable (can absorb) macromolecular material and composite thereof is lower than metal material, if adopt a word groove of plain screw ailhead, characteristics such as the groove of screw ailhead is yielding in the rotation, the bone screw ailhead of design adopts two of certain depth fixedly turn holes, make bone screw ailhead stress equalization in turn of biodegradable (can absorb) internal fixation, not yielding; The screw tap that kit uses, revolve awl, easy and simple to handle in clinical operation, moderate cost is convenient to promote the use of.

Four, description of drawings

Fig. 1 biodegradable internal fixation of the present utility model bone screw;

Fig. 2 is the right view of Fig. 1;

One of Fig. 3 supporting tool using of the present utility model screw tap;

Two of Fig. 4 supporting tool using of the present utility model--revolve awl;

Fig. 5 is another enforcement illustration of this utility model bone screw.

Five, the specific embodiment

The present invention is further described with reference to the accompanying drawings: bone screw shown in Figure 1 is made up of screw thread 4, screw rod 5 and circular ailhead 6, circular ailhead 6 is rounded along the axis of bone screw, end face has the two turn circular holes 13 that distribute of the centrosymmetry with the axis, and turn circular hole 13 has certain depth.Bone screw is made by biodegradable (can absorb) macromolecular material and composite thereof, have the requirement of strength that satisfies the fracture internal fixation, its good biocompatibility can be degraded fully and be absorbed by the body and metabolism, second operation be need not need, thereby patient's misery and financial burden alleviated.Screw tap shown in Figure 3 comprises conehead 7 (screw thread of conehead 7 and the screw thread of bone screw 4 are complementary), awl bar 8 and handle 9 compositions, be mainly used in and on the bone at fracture fixation position, carry out thread tapping, be beneficial to being screwed into of biodegradable (can absorb) internal fixation bone screw.The awl that revolves shown in Figure 4 is formed (circle crutch 14 has the two circle crutches that are complementary with bone screw ailhead 13 for the end of conehead 10) by conehead 10, awl bar 11, handle 12 and circle crutch 14, be mainly used in bone screw is screwed into the fixation of fractures position, be that the fracture fixation position is after tapping, the round crutch 14 that revolves awl is inserted in the turn circular hole of bone screw ailhead 13, then bone screw is aimed at the screwed hole of tapping and be screwed into the fracture fixation position.

With reference to Fig. 5, biodegradable of the present utility model (can absorb) internal fixation bone screw can by screw thread 4, and circular ailhead 6 form.

Because biodegradable of the present utility model (can absorb) internal fixation bone screw, have excellent biological compatibility and mechanical strength preferably, do not need second operation in clinical; The ailhead structure of bone screw is suitable for the characteristics of biodegradable (can absorb) internal fixation bone screw, and is not yielding; Matching used instrument-the screw tap of this utility model, revolve awl, use earlier the screw tap tapping in use, be screwed into bone screw and carry out internal fixation with revolving to bore at fixed position then, its clinical manipulation is simple; Matching used instrument screw tap, revolve awl, be easy to high-temperature sterilization.

Claims

1, biodegradable internal fixation bone screw and supporting screw tap thereof with revolve awl, it is characterized in that the internal fixation bone screw comprises that screw thread 4, screw rod 5 and screw ailhead 6 three parts form; Screw tap is made up of conehead 7 awl bars 8 and handle 9 three parts, and the screw thread of conehead 7 and the screw thread of bone screw 4 are complementary; Revolve awl and be made up of the round crutch 14 of conehead 10, awl bar 11, handle 12 and conehead 10 ends, after the screw tap tapping, the round crutch 14 that revolves the awl end is inserted in the turn circular hole of bone screw ailhead 13, bone screw is fixed.

2, biodegradable internal fixation bone screw according to claim 1 and supporting screw tap thereof with revolve awl, it is characterized in that screw ailhead 6 is rounded along the axis of bone screw, be symmetrically distributed with two turn circular holes 13 in the positive axis of end face, and with the use that is complementary of circle crutch 14.