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Interference screw for department of orthopaedics

An extrusion screw, orthopedic technology, applied in the field of medical devices, can solve problems such as the lack of tight fixation of the tendon, affecting the tendon-bone recovery, and the mechanical properties of the tendon graft. The effect of strong pressure and position retention ability and convenient early functional rehabilitation exercise

Active Publication Date: 2014-12-03
GUANGDONG HONGZHI BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have a serious defect: the tendon is not tightly fixed on the bone canal wall, and the tendon will produce a "pendulum effect" or "bungee effect" during exercise, and it will be cut continuously at the position of the sharp bone tunnel inner opening, which may lead to loosening of the tendon Even broken, reducing joint movement function
At the same time, the tendon cannot be in good contact with the wall of the bone canal, and it is difficult to form tendon ossification, which affects tendon-bone recovery
[0005] Second, design flaws
Because the diameter of the bone tunnel drilled during the operation is equal to or slightly smaller than that of the screw, a tendon graft of the same diameter must be implanted in the bone tunnel. At this time, the sharp self-tapping thread of the screw can easily cut the tendon graft and the wall of the bone tunnel. As a result, the mechanical properties of the tendon graft are reduced and cannot be firmly fixed. In severe cases, the tendon will rupture again during postoperative sports
In addition, the thread tip is easy to bend and deform during the process of squeezing the bone canal, resulting in a decrease in the fixation force

Method used

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  • Interference screw for department of orthopaedics
  • Interference screw for department of orthopaedics
  • Interference screw for department of orthopaedics

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Embodiment Construction

[0037] like figure 1 , figure 2 , image 3 As shown in the figure, an orthopedic extruded screw includes a head end 1, a threaded section 2, and a tail end 3, and the head end 1, the threaded section 2, and the tail end 3 are fixedly connected in sequence; the head end 1 and the tail end 3 The outer surface is smooth; the end face 13 of the head end 1 and the circumferential surface 14 use a rounded corner 11 to transition, or a chamfer; the bottom of the tail end 3 is passivated to form a platform 31; the head end 1, the threaded section 2 and the The tail end 3 is integrally formed; the head end 1 is a cylindrical shape 12; the tail end 3 is a truncated cone shape 32; The radius is the same; the minimum radius of the thread segment 2 is the same as the maximum radius of the tail end 3; the thread of the thread segment 2 adopts a zigzag thread 21, and the cross section of the thread 22 of the zigzag thread is an isosceles trapezoid. The corners 23 on both sides adopt rou...

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Abstract

The invention provides an interference screw for the department of orthopaedics. The interference screw for the department of orthopaedics comprises a head end, a threaded section and a tail end, wherein the head end, the threaded section and the tail end are fixedly connected in sequence; the outer surface of the head end and the outer surface of the tail end are smooth. The interference screw for the department of orthopaedics aims to overcome the defects in the prior art, is used for rebuilding and restoring an articular ligament, enhances connection firmness, reduces the cutting effect on muscle tendons and improves the treatment effect on the rebuilt ligament.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an extrusion screw. Background technique [0002] Cruciate ligament injury is one of the most common and serious sports injuries. A torn cruciate ligament can cause joint instability. Improper treatment can lead to knee joint instability, secondary articular cartilage damage, and eventually osteoarthropathy, which seriously affects the knee joint. Joint function, resulting in limited daily activities of patients, and gradually lead to a decline in self-care ability and loss of self-confidence. Extrusion screws are used for arthroscopic cruciate ligament repair to fix the tendon in the bone tunnel and ensure the healing of the tendon. [0003] At present, the extrusion screw products used in China are generally titanium alloy screws or absorbable screws. These products mainly include: [0004] One is the flaw of the treatment method. The treatment methods for crucia...

Claims

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Application Information

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IPC IPC(8): A61B17/56
CPCA61B17/862A61B17/8625A61B17/8635A61B17/866A61B2017/564
Inventor 万绵水
Owner GUANGDONG HONGZHI BIOTECHNOLOGY CO LTD
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