In vivo degradable and absorbable metal encirclement device for bone fracture internal fixation

A metal and fracture technology, applied in the field of metal embracing devices, can solve the problems of prolonging the rehabilitation period, increasing the amount of bone plate or bone nail used, and increasing the pain of patients, so as to reduce the long-term postoperative risk, improve the treatment effect, and have significant clinical significance Effect

Active Publication Date: 2011-06-22
SUZHOU ORIGIN MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of metal bone plate itself cannot be degraded and absorbed by the human body. Once implanted in the human body, it is almost impossible to take it out. It will exist in the patient's body for a long time, which will cause the patient's movement to remain unchanged and the pain to intensify. Adverse reactions such as inflammation of nerve and muscle tissue
[0003] Chinese patent CN200820056160.8 discloses a degradable rib internal fixator made of silk / polycaprolactone. This kind of fixator made of polymer material has poor mechanical properties and fixation performance, and it is difficult to meet clinical requirements. The need for bone fixation, and natural polymers such as silk can easily cause the body's immune response, and its degradation and metabolism pose a safety hazard
The disadvantages of this type of bone plate are: firstly, when there are many bone fragments or fracture lines at the fracture site, the amount of bone plate or bone screw used will be greatly increased; secondly, the magnesium alloy has low strength and cannot be directly fixed. When screwing into the bone, it is necessary to use hard bone nails such as stainless steel to tap the hole first, which increases the difficulty and time of the operation for the doctor; finally, screwing in the bone screw is another damage to the bone, which increases the original trauma area and prolongs the operation time. Increased recovery cycle and increased patient suffering

Method used

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  • In vivo degradable and absorbable metal encirclement device for bone fracture internal fixation
  • In vivo degradable and absorbable metal encirclement device for bone fracture internal fixation
  • In vivo degradable and absorbable metal encirclement device for bone fracture internal fixation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] High-purity magnesium (99.99%) is made into 1mm thick sheet, and then cut into figure 1 In the pattern shown in A, the 3 connecting parts of the sheet ( figure 1 1 in A) and 4 fixed parts ( figure 1 2) One-piece connection in A, with a groove in the middle of the thin plate. As shown in the figure, the solid total width range of the connection part of the flat pattern is 5-20mm, and the width of the narrowest part ( figure 1 1 arrow in A) is 2.5mm, slightly smaller than the edge of the fixed part ( figure 1 The 3 arrows in A) the narrowest width is 2.75mm, the narrowest part of the fixed claw ( figure 1 The 2 arrows in A) have a width of 3.5mm, which is larger than the narrowest width (2.75mm) of the connecting part (2.5mm) and the edge of the embracing device. The fixed claws of the above-mentioned flat pattern are bent 90 degrees to become a rib encircling device.

[0025] After the above-mentioned rib embracing device was implanted into the 6th pair of ribs in 8 5...

Embodiment 2

[0027] figure 2 , image 3 It is a claw-shaped metal embracing device made of Mg-6Zn medical magnesium alloy, which can be used for the treatment of rib or clavicle fractures. engrave the two with figure 2 The magnesium alloy plates with patterns shown in A and 2B are connected by pins and then bent into figure 2 C and 2D show the circulator. The pin is not embedded in the bone, but partially embedded in the periosteum. It cannot function as an internal fixation alone, but is only a special connecting part connecting the fixed parts on both sides. The embracing device is composed of 4 sets of claw-shaped fixing parts and 3 sets of connecting parts with a thickness of 2mm. The two wings of the claw-shaped fixing parts are Y-shaped arms, and the middle pair of wings is a double Y-shaped structure. There are several regular hexagonal holes on the embracing device to facilitate the repair of biological tissues.

[0028] image 3 A deformed structure of this kind of wrappe...

Embodiment 3

[0031] The Mg-3Zn-1Ca alloy was extruded and wire-cut into thin plates with a thickness of 0.5 mm after solution treatment. The above-mentioned thin plate is curled into a U shape as a phalanx (toe) bone wrapper. Figure 4 A and 4B are the top view and left side view of the phalanx embracing device formed by a single fixing part. Figure 4 C, 4D are the top view and left view of the phalanx embracing device formed by two fixing parts and one connecting part. The width of the two wings of the claw-shaped fixing part of the embracing device is 3.5 mm, and the outer side is a semicircular structure, which is smaller than the narrowest part of the connecting part The width is 1.26×2=2.52mm, and there are round holes and oval holes on the connecting part, and the length of the whole embracing device is 8-12mm.

[0032] the above Figure 4 The phalanx embracing device shown in C and 4D was implanted in 2 patients with comminuted fractures in the front part of the middle finger. Wi...

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Abstract

The invention discloses an in vivo degradable and absorbable metal encirclement device for bone fracture internal fixation, which consists of a single claw-shaped fixing part, or a plurality of claw-shaped fixing parts and connecting plates combined together alternately. The encirclement device is prepared from a degradable metal material. The encirclement device tightly encircles a bone fracture part through a fixed claw to realize engagement alignment of broken bones; the connecting plates of the encirclement device connect the claw-shaped fixing parts together to form a shape matched with that of a bone. When the bone fracture part is healed up, the connecting plates of the encirclement device are degraded gradually, and when the bone fracture part has the mechanical strength of a normal bone, claw-shaped fixing ends of the encirclement device lose the fixing effect, become fragments coated by muscles and fibrous tissues and finally are completely absorbed by an organism. On the premise of meeting the fixing effect of a magnesium alloy bone plate, the encirclement device can greatly improve the treatment effect of the magnesium alloy bone plate without using wedge-type fixing ends such as magnesium alloy bone pegs and the like, and simultaneously, the magnesium alloy bone plate is not needed to be taken out through a secondary operation, so that pains of the patient are alleviated and postoperative long-term risks of the patient are reduced.

Description

technical field [0001] The invention relates to an orthopedic internal fixation device, specifically, a metal embracing device which can be degraded and absorbed in the human body as an internal fixation joint for fractures. Background technique [0002] In recent years, various types of bone plates have shown the advantages of reliable fixation and good alignment in the clinical treatment of rib and clavicle fractures, and have gradually replaced traditional therapies such as chest strap compression bandaging or traction fixation. Documents such as Chinese patents CN201642285 and CN200620071652 have recorded claw-shaped rib bone plates made of titanium alloy or stainless steel, which have a certain clinical fixation effect. However, this type of metal bone plate itself cannot be degraded and absorbed by the human body. Once implanted in the human body, it is almost impossible to take it out. It will exist in the patient's body for a long time, which will cause the patient's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/82
Inventor 张小农张绍翔秦雄宋阳
Owner SUZHOU ORIGIN MEDICAL TECH
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