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Thread assembly used for setting lag screw state in intramedullary nail system and intramedullary nail system comprising thread assembly

A threaded component and intramedullary nail technology, applied in the field of intramedullary nail systems, to achieve the effect of easy use and simple structure

Pending Publication Date: 2020-09-15
KANGHUI MEDICAL INNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In clinical practice, for stable fractures, when the main nail and the lag screw are in the unlocked state, the existing product design can achieve limited retreat of the lag screw, but there is also a risk of the lag screw being cut forward.

Method used

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  • Thread assembly used for setting lag screw state in intramedullary nail system and intramedullary nail system comprising thread assembly
  • Thread assembly used for setting lag screw state in intramedullary nail system and intramedullary nail system comprising thread assembly
  • Thread assembly used for setting lag screw state in intramedullary nail system and intramedullary nail system comprising thread assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Image 6 It is a schematic diagram of the use state of a threaded component used to set the state of a lag screw in an intramedullary nail system. The intramedullary nail system includes a driving part 1, a spring 2, a clamping part 3, a tail cap 4, a lag screw 5, a main nail 6, a locking nail 7 and a compression screw 8 in the threaded assembly composition.

[0045] In a further embodiment, the thread assembly (Set Screw) involved in this invention is pre-installed in the central through hole 6 - 1 of the proximal end of the main nail 6 . The semicircular guide boss 3-3 on the side wall of the clamping part 3 is compatible with the guide groove 6-3 in the central through hole 6-1 of the main nail on the main nail 6 of the intramedullary nail. The clamping part 3 can move up and down in the central through hole 6-1 along the guide groove 6-3. The external thread 1-1 of the proximal part of the driving part is compatible with the internal thread 6-2 in the ...

Embodiment 2

[0047] Example 2: Image 6 It is a schematic view of the use state of a threaded assembly used to set the state of a lag screw in an intramedullary nail system. The intramedullary nail system includes a driving part 1, a spring 2, a clamping part 3, a Tail cap 4, a lag screw 5, a main intramedullary nail 6, a locking nail 7 and a compression thread 8.

[0048] In a further embodiment, the thread assembly (Set Screw) involved in this invention is pre-installed in the central through hole 6-1 of the proximal end of the main nail 6, and the semicircular guide protrusion on the side wall of the clamping part 3 The platform 3-3 is compatible with the guide groove 6-3 in the central through hole 6-1 on the main nail 6, and the clamping part 3 can move up and down along the guide groove 6-3. The external thread 1-1 at the proximal end of the driving part is compatible with the internal thread 6-2 in the central through hole 6-1 of the main nail. During the operation, the tool is in...

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Abstract

The invention relates to a thread assembly used for setting lag screw state in an intramedullary nail system. The thread assembly is particularly used for preventing a lag screw of a postoperative intramedullary nail from moving out of the articular surface of caput femoris and comprises three components, namely, a driving component, a spring and a clamping component, wherein the side wall of theupper section part of the driving component has an external thread and is used for being matched with an internal thread of a center hole of a main nail of the intramedullary nail; the side wall of the lower end of the driving component adopts an excircle structure, a step excircle is arranged on the excircle surface, the lower section is a clamping limiting section, the middle section is an extending section, and the upper section is a matched step; the clamping component adopts an excircle structure provided with a guide boss on the side wall, and the guide boss has a semicircular appearance; and a groove is formed in the upper part of the clamping component and is divided into an upper-section groove and a lower-section groove, a flange is arranged in the upper-section groove and is inclearance fit with the extending section of the driving component, and the upper-section groove is a sliding chute and is in clearance fit with the clamping limiting section of the driving component.

Description

technical field [0001] The invention relates to a thread assembly, in particular to a thread assembly for setting the state of a lag screw in an intramedullary nail system, which can prevent the lag screw from cutting out of the femoral head forward and damaging the articular surface of the hip joint after operation. The invention also relates to an intramedullary nail system using such a threaded assembly. Background technique [0002] Intramedullary nailing is currently the main way to treat long bone fractures, especially the treatment of intertrochanteric fractures accounts for more than 60% of the total use of intramedullary nails. When choosing an intramedullary nail solution for intertrochanteric fractures, the doctor mainly considers the fracture type and bone quality of the patient: a. For unstable fractures, it is necessary to stably connect the main nail and the lag screw to form a stable The internal fixation frame can rebuild the mechanical strength and meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/72A61B17/74
CPCA61B17/72A61B17/7225A61B17/7216A61B17/725A61B17/74A61B2017/00407A61B17/744
Inventor 管建军柯林华秦宗俊
Owner KANGHUI MEDICAL INNOVATION
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