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Cardia stent

A technology on the cardia and stent, which is applied in the field of medical inner stent to achieve the effect of improving the anti-reflux effect, good positioning and strong anti-reflux function

Inactive Publication Date: 2008-01-23
程英升 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, cardia stenosis caused by esophageal cardia cancer, achalasia, esophageal hiatal hernia, or other physical or chemical damage often occurs after surgical treatment, according to Zhu Ming et al. in Chinese patent ZL97200206.5 A disclosed medical endoluminal stent with a membrane has achieved certain results in the treatment of this type of stenosis. However, due to the special shape of the cardia, which connects the esophagus and the stomach, and has the function of preventing reflux, the implanted stent not only requires good positioning , is not easy to shift, and a part of the stent will go deep into the stomach, and the corrosion and fracture caused by the exposed metal wire soaking in the gastric juice should be avoided. cardia stent used

Method used

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Examples

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Effect test

Embodiment 1

[0026] Example 1: Fabrication of a single-layer anti-reflux cardiac stent

[0027] Select medical-grade titanium-nickel shape memory alloy wire 8 with a recovery temperature of 25°C to 33°C and a diameter of 0.2mm to 0.25mm, and weave it in the mold to form a drum-shaped upper end 1, a trumpet-shaped lower end 2, and a cylindrical tubular shape 3 in the middle. The wire mesh is then heat-treated in the mold, so that the titanium-nickel shape memory alloy wire mesh after the heat treatment is above the recovery temperature (such as 35 ° C ~ 37 ° C), the upper end is drum-shaped 1, the lower end is trumpet-shaped 2, and the middle is Cylindrical tube 3. In a special mold, the medical grade silicone 4 is used to cover the other parts of the screen except the upper drum 1, and at the same time, a downwardly convex semi-spherical silicone film is made at the connection between the lower horn 2 and the middle cylindrical network tube 3, Cut the hemispherical silicone film into thre...

Embodiment 2

[0028] Example 2: Manufacture of double-layer anti-reflux cardiac stent

[0029] The basic manufacturing method is the same as that of Example 1, except that the mold used in the last lamination process is different, at the connection between the trumpet-shaped positioning port 2 at the lower end and the middle cylindrical mesh pipe 3, and the drum-shaped positioning port 1 at the upper end and the middle cylindrical mesh pipe 3 Two layers of anti-reflux valves 5 are respectively formed at the connecting parts, that is, the double-layer anti-reflux cardiac stent of the present invention is obtained, as shown in Fig. 3, Fig. 4 and Fig. 5 .

Embodiment 3

[0030] Example 3: Fabrication of a single-layer anti-reflux cardiac stent with a recovery thread

[0031] The basic manufacturing method is the same as that of Example 1, except that after the single-layer anti-reflux cardiac stent is manufactured, a medical surgical suture (i.e., recovery thread 6) is used on the edge of the upper end of the uncoated drum-shaped positioning port 1 Through the mesh formed by the titanium-nickel shape memory alloy wire 8, the single-layer anti-reflux cardia stent with recovery thread of the present invention is obtained. When the recovery line 6 is tightened, the drum-shaped positioning opening 1 is contracted centripetally, which in turn drives the entire cardia stent to contract centripetally, so that it is convenient to adjust the position of the cardia stent or take the whole stent out of the body when necessary. Refer to Fig. 6 and Fig. 7 .

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Abstract

The present invention relates to a medical stent, and in particular to a cardia stent for treatment on the narrow carida of the oesophagus. The cardia stent according to the present invention is woven by wires of shape memory NiTi alloy. There is a drum-shaped locating port at its upper end, and a trumpet-shaped locating port at its lower end. The upper drum-shaped locating port is connected with the lower trumpet-shaped locating port by a supporting net tube. The remaining portions other than the drum-shaped locating port are coated with a membrane of medical flexible material that can be implanted into a human body. The cardia stent comprises at least an anti-reflux valve. The anti-reflux valve is of a triple-petal structure protruding downward that is made from a membrane of medical flexible material that can be implanted into a human body. The cardia stent has the advantages of: difficult to shift, matching with carida anatomy, high anti-reflux ability, easy operation, resisting the corrosion of gastric juice, and it can be used in expansion treatment on the narrow carida caused by variable reasons.

Description

technical field [0001] The invention relates to a medical internal support, in particular to a cardiac support for treating esophageal cardia stenosis. Background technique [0002] In the prior art, cardia stenosis caused by esophageal cardia cancer, achalasia, esophageal hiatal hernia, or other physical or chemical damage often occurs after surgical treatment, according to Zhu Ming et al. in Chinese patent ZL97200206.5 A disclosed medical endoluminal stent with a membrane has achieved certain results in the treatment of this type of stenosis. However, due to the special shape of the cardia, which connects the esophagus and the stomach, and has the function of preventing reflux, the implanted stent not only requires good positioning , is not easy to shift, and a part of the stent will go deep into the stomach, and the corrosion and fracture caused by the exposed metal wire soaking in the gastric juice should be avoided. Cardiac stent used. Contents of the invention [0...

Claims

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Application Information

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IPC IPC(8): A61F2/04A61M29/00A61B17/00A61F2/07A61F2/90
CPCA61F2/2412A61F5/4405A61F2230/0078A61F5/0076A61F2250/0039A61F2/07A61F2/2418A61F2/90A61F2002/044
Inventor 程英升周星朱明
Owner 程英升
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