Locking bone screw with expansionstructure

A bone screw and expansion structure technology, applied in the field of medical devices, can solve the problems of increasing patient pain, malunion, secondary surgery, etc., and achieve the effects of scientific and reasonable structure, enhanced pull-out resistance, and simple and convenient operation.

Inactive Publication Date: 2014-12-24
ZHEJIANG CANWELL MEDICAL DEVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the connection between the thread on the screw and the cortical bone and cancellous bone has the following disadvantages: First, due to the characteristics of bone composition, once the thread on the screw fails to connect with the cortical bone, it is easy to cause the screw to loosen or even break away from the steel plate, resulting in nonunion or fracture. Delayed union or malunion or th

Method used

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  • Locking bone screw with expansionstructure
  • Locking bone screw with expansionstructure
  • Locking bone screw with expansionstructure

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example one

[0023] It includes an expansion nail rod 2 with a blind hole 1 and a top nail 3 that matches the blind hole 1 of the expansion nail rod 2. The blind hole 1 of the expansion nail rod 2 has internal threads 4 at the tail, and the top nail 3 has a tail The external thread 5 engaged with the blind hole 1 of the expansion nail rod 2 and the internal thread 4 of the tail; the head of the expansion nail rod 2 is conical, and the top nail 3 is screwed into the blind hole 1 of the expansion nail rod 2 and can be pushed The head of the nail 3 is propped up by two cross-shaped expansion grooves 6, the end of the expansion nail 2 is provided with a taper external thread 7 for screwing it into the broken bone 8, and the end of the tail is made with a taper external thread 7 Screwed into the cross-shaped groove 9 in the broken bone 8; the head of the top nail 3 is conical, and the tail of the top nail 3 is formed with a cross-shaped groove 10 that can screw the top nail 3 ...

Example Embodiment

[0024] Example two

[0025] It includes an expansion nail rod 12 with a blind hole 11, a top nail 13 that matches the blind hole 11 of the expansion nail rod 12, the end of the blind hole 11 of the expansion nail rod 12 is made with internal threads 14, and the end of the top nail 13 is made with The external thread 15 engaged with the internal thread 14 of the end of the blind hole 11 of the expansion nail rod 12; the head of the expansion nail rod 12 is conical, and the top nail 13 is screwed into the blind hole 11 of the expansion nail rod 12 and can be pushed The head of the nail 13 is propped up with two cross-shaped expansion grooves 16, and the expansion nail rod 12 is made with an external thread 17 that is screwed into the broken bone 18 and a tapered tail part and an external thread 21 of a cylindrical outer wall. The tail end is made There is a cross-shaped slot 19 screwed into the broken bone 8; the head of the top nail 13 is conical, and the tail of the top nail 13 i...

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PUM

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Abstract

The invention discloses a locking bone screw with an expansion structure, which belongs to the technical field of medical devices. The locking bone screw with the expansion structure is characterized by comprising an expansion screw rod and a top screw matched with the expansion screw rod, wherein internal threads are formed in a blind hole or a through hole of the expansion screw rod; external threads which are engaged with the internal threads in the blind hole or the through hole of the expansion screw rod are formed in the top screw; more than one expansion groove is formed in the head part of the expansion screw rod; a groove, a polygonal blind hole or a polygonal bump through which the top screw can be screwed into the blind hole or the through hole of the expansion screw rod is formed in the tail part of the top screw; external threads through which the expansion screw rod can be screwed into a broken bone to form a taper are formed in the tail part of the expansion screw rod; a groove through which the external threads with the taper can be screwed into the broken bone is formed in the end surface of the tail part of the expansion screw rod. According to the locking bone screw with the expansion structure, the friction force between the bone screw and a cancellous bone can be increased, and the pulling resistance of the bone is increased, so that the screw is firmly connected with a cortical bone or the cancellous bone; the bone screw is easy and convenient to operate, and is easily screwed and removed during a surgery.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to a locking bone screw with an expansion structure. Background technique [0002] The skeleton consists of cortical bone, cancellous bone, and bone marrow from the outside to the inside. Characteristics of cortical bone: relatively hard and relatively thick; characteristics of cancellous bone: relatively loose and relatively thick. Fracture is the most common clinical case, and the treatment method adopts the treatment method of common internal fixation, that is, usually adopts bone screw and locking plate to fix the broken bone back together. And the existing bone screws are all connected between cortical bone and cancellous bone by thread on the screw, such as publication number: 102458285A "bone screw"; publication number: 103126761A "bone screw"; announcement number: "bone screw" etc. The technical solution described. However, the connection between the t...

Claims

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Application Information

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IPC IPC(8): A61B17/86
CPCA61B17/8685A61B17/8625A61B2017/8655
Inventor 方明盛浩
Owner ZHEJIANG CANWELL MEDICAL DEVICES CO LTD
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