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Orthopedic lag screw capable of automatically realizing dynamic-static conversion

A static conversion and screw technology, applied in the field of medical devices, can solve the problems of disappearance, osteopenia, non-union of fractures, etc., and achieve the effect of reliable support

Pending Publication Date: 2021-12-24
SHANGHAI SIXTH PEOPLES HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all threaded lag screws are extruded by displacement, but there are often patients with bone resorption at the fractured end, which eventually creates gaps, reducing or disappearing the pressure generated by displacement.
Because one side of the half-thread screw does not have threads, it can slide under the action of gravity, etc., which theoretically avoids this situation. However, human bones have a certain length, and half-thread screws tend to cause bone loss and bone shortening. , and affect the patient's healing
[0004] Therefore, the structure and function of lag screws used in orthopedic treatment at the present stage are single, unable to adapt to changes in human fracture healing, and make corresponding adjustments, resulting in nonunion, malunion, and insufficient bone length after healing in some patients. series of questions

Method used

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  • Orthopedic lag screw capable of automatically realizing dynamic-static conversion
  • Orthopedic lag screw capable of automatically realizing dynamic-static conversion
  • Orthopedic lag screw capable of automatically realizing dynamic-static conversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see figure 1 As shown, this embodiment provides an orthopedic lag screw that automatically realizes dynamic-static conversion, including a screw body 1 and a distraction assembly 2 .

[0039] Specifically, such as figure 2 Among them, the screw body 1 is provided with a first through hole 11 along the direction of the central axis, the outer surface of the head of the screw body 1 is provided with a first threaded portion 12, and the outer surface of the tail of the screw body 1 is provided with a second threaded portion 13, The tail of the screw body 1 is divided into two layers, forming an inner layer 14 and an outer layer 15 .

[0040] Specifically, such as figure 2 Among them, a sinker 18 is provided at the tail end of the inner layer 14 . Preferably, the shape of the sinker 18 is one of square, hexagonal and quincunx. Further, the sinker 18 is hexagonal in shape.

[0041] Specifically, the head of the outer layer 15 is provided with a spiral groove 16, the s...

Embodiment 2

[0047] This embodiment provides the method for using the lag screw in Embodiment 1, which specifically includes the following steps:

[0048] Step S1, combining the screw body 1 and the expansion component 2:

[0049] Forward rotation of the strut assembly 2, through the cooperation of the third threaded part 17 and the fourth threaded part 22, the support part 24 is in contact with the tail end of the inner layer 14;

[0050] Step S2, stretching the outer layer 15:

[0051] Continue to rotate the expansion assembly 2 in the forward direction, and through the cooperation of the third threaded part 17 and the fourth threaded part 22, the tail end of the outer layer 15 is constantly approaching the limit part 23, and the outer layer 15 is continuously stretched until the outer layer 15 The tail end of the layer 15 is in contact with the limiting portion 23;

[0052] Step S3, implanting lag screws:

[0053] Cooperate with the sinking groove 18 to apply a positive force through t...

Embodiment 3

[0057] The first embodiment is based on the first embodiment, and the difference is that there is a gap between the inner layer 14 and the outer layer 15, and the specific structure of the expansion component 2 is different.

[0058] In this example, if Figure 4 Among them, the expansion assembly 2 includes a support part 24 and a limit part 23, and the outer surface of the tail part of the support part 24 is provided with a fourth thread part 22, which cooperates with the third thread part 17; the tail end of the support part 24 is vertically fixed at the limit The position part 23 is close to one side of the screw body 1 , the limit part 23 is provided with a second through hole 21 along the direction of the central axis, and the support part 24 is inserted into the gap.

[0059] In this example, if Figure 4 Among them, the support portion 24 is a ring structure or a plurality of arc structures.

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Abstract

The invention provides an orthopaedic lag screw capable of automatically achieving dynamic-static conversion and a using method thereof. The orthopaedic lag screw comprises a screw body and a distraction assembly; the screw body is provided with a first through hole channel in the center axis direction, and the outer surface of the head of the screw body is provided with a first thread part; a second thread part is arranged on the outer surface of the tail of the screw body; the tail of the screw body is divided into two layers including an inner layer and an outer layer; a sinking groove is formed in the tail end of the inner layer, and a spiral groove is formed in the head of the outer layer and penetrates through the outer layer; a second thread part is arranged on the outer surface of the tail of the outer layer; a third thread part is arranged on the inner surface of the tail of the outer layer; and the outer layer is stretched and fixed through cooperation of the distraction assembly and the third thread part. By adopting the double-layer design, the problem that a traditional lag screw cannot adapt to the change of human fracture healing is solved.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to an orthopedic lag screw that automatically realizes dynamic-static conversion. Background technique [0002] There are two types of lag screws mainly used at this stage: full-thread lag screws and half-thread lag screws. Among them, the main feature of the full-thread lag screw is that the surface of the screw has threads. According to the specific model, the distribution of the thread on the outer surface of the screw is various; the main feature of the half-thread screw is that only the head part is threaded, and the rest are smooth screws. Slide within the fracture fragment. [0003] During the fracture healing process, it is often necessary to apply pressure to the fracture end. At present, all threaded lag screws are extruded by displacement, but there are often patients with bone resorption at the fractured end, resulting in gaps, which reduce or eliminate the compression c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/72
CPCA61B17/7258
Inventor 张伟尹博浩
Owner SHANGHAI SIXTH PEOPLES HOSPITAL