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Helical latch type biliary tract stent

A screw and lock technology, applied in stents, devices for human tubular structures, etc., can solve problems such as high prices, and achieve the effect of high tube wall strength and less axial shrinkage.

Inactive Publication Date: 2009-11-04
王俊
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  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the diameter of the metal mesh stent can reach 7-10 mm after expansion, and the effect of maintaining the patency of the biliary tract is good and lasts for a long time. However, its mesh structure will cause it to fuse with the peripheral tissue after implantation and cannot be removed. When the stent is blocked, it will A new stent is implanted at the original stent position, so the inner diameter of the biliary tract will become smaller and smaller irreversibly. In addition, the price is high, which is roughly 10 times that of the polymer stent; the polymer stent cannot be expanded, and its inner diameter is 2-3mm. The time to maintain biliary tract patency is short, and stent blockage often occurs shortly after implantation, but its structure determines that it can be removed from the biliary tract, so patients implanted with polymer stents often need to constantly replace new stents to maintain biliary tract patency sex

Method used

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  • Helical latch type biliary tract stent
  • Helical latch type biliary tract stent
  • Helical latch type biliary tract stent

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Embodiment Construction

[0021] Such as figure 1 , figure 2 , image 3 As shown, the present invention is made of a memory-trained nickel-titanium alloy with an "S" cross-section, and certain equipment and devices are used to wind it into a spiral clockwise or counterclockwise, and the materials at both ends of the spiral are bent, and one end is formed The right-angled clamping plate 2 forms a curved clamping plate 3 at the other end.

[0022] Such as Figure 4 , Figure 5 As shown, in the present invention, two adjacent helices are interlocked by the locking point 5 on the "S"-shaped section material 4 to prevent the two adjacent helices from detaching. When the stent 1 is in the contracted state, the diameter of the stent 1 is relatively small, and the distance between the stuck points 5 of two adjacent helices is the farthest, so the pitch of the stent is also the smallest.

[0023] Such as Figure 6 , Figure 7 As shown, due to the effect of the nickel-titanium memory alloy, when the sten...

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Abstract

The invention discloses a helical latch type biliary tract stent produced by winding nickel-titanium alloy strips with S-shaped cross sections after memory training into the form of a helix, and latching each helix with adjacent helixes. The helical latch type biliary tract stent combines the features of the metal net-like stent and the macromolecule tubular stent, further improves the stent curative effect on patients with biliary tract neoplasm, and prolongs the lifetime of the patients.

Description

technical field [0001] The invention relates to a biliary tract endoscopic instrument, in particular to a screw lock type biliary stent. Background technique [0002] In clinical diseases, biliary nausea and obstruction are mostly caused by compression of the bile duct by cholangiocarcinoma, gallbladder cancer, liver cancer, pancreatic head cancer, ampulla cancer or other metastatic cancers, and cholestasis in the liver leads to impaired liver function, biliary tract infection and other malignancies. Complications, such patients are often in poor physical condition and have a low success rate of surgery. For such a situation, the palliative treatment method of implanting a stent in the stenotic segment of the biliary tract is currently clinically used to achieve the purpose of maintaining the patency of the biliary tract for a certain period of time. [0003] The current stents are roughly divided into metal mesh stents and polymer tubular stents. Among them, the diameter ...

Claims

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Application Information

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IPC IPC(8): A61F2/88A61F2/82A61F2/04
Inventor 全志伟李济宇李松岗刘颖斌王俊
Owner 王俊
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