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Shape memory spring coil and manufacture method and application method thereof

A memory spring and memory polymer technology, applied in the field of medical devices, can solve problems such as coils for intravascular aneurysms that have not yet been seen, and achieve the effects of reducing the risk of perforating aneurysms, low stiffness, and increasing embolization density

Inactive Publication Date: 2013-03-06
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the use of shape memory polymer materials to make intravascular aneurysm coils

Method used

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  • Shape memory spring coil and manufacture method and application method thereof
  • Shape memory spring coil and manufacture method and application method thereof
  • Shape memory spring coil and manufacture method and application method thereof

Examples

Experimental program
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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Shape memory coil of the present invention such as figure 1 As shown, it is a helical structure made of shape memory polymer material. The shape memory polymer material is polyurethane or other shape memory polymers with good biocompatibility.

[0033] The preparation method and the use method of the shape memory coil of the present invention can be specifically described as follows by the following examples:

[0034] Utilizing an extrusion molding process, polyurethane particles with a glass transition temperature (that is, shape memory recovery temperature) of 37.5° C. are made into filaments.

[0035] Make a mold with a spiral cavity, place filaments in the mold, heat the mold at a temperature slightly lower than the melting point of polyurethane, keep it warm for 1 hour, and demould after cooling to obtain a spiral shape memory c...

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PUM

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Abstract

A shape memory spring coil is a spiral structural member made of shape memory polymer material. A manufacture method of the shape memory spring coil includes firstly manufacturing polymer threads by the process of extrusion molding; secondly, manufacturing the thread-type shape memory spring coil by a mold into a spiral shape (permanent shape); and thirdly, fixing the shape of the polymer into a straight fine-thread shape (temporary shape) by a proper method. An application method of the shape memory spring coil includes conveying the straight fine-threaded spring coil to an aneurysm cavity through a micro catheter, the fine-threaded spring coil automatically restores to the original spiral structure at human body temperature, and accordingly aneurysm is packed. The spring coil made of polymer material with biocompatibility compared with metal is small in density, low in rigidity and soft in texture, compact packing rate of the aneurysm cavity can be increased, risk of perforating aneurysm by the spring coil in operation is lowered, damage of peripheral nerves and vessels, which is caused by gravity press after embolism of the spring coil, is reduced, manufacture process is simple, and cost is low.

Description

technical field [0001] The invention relates to medical equipment, in particular to a shape memory spring coil. Background technique [0002] Aneurysms are hemangioma-like protrusions resulting from abnormal changes in arterial blood vessels. When the intravascular blood pressure suddenly rises or arteriosclerosis occurs, the aneurysm will rupture and bleed, which will cause disability or death of the patient. At present, the method of endovascular neurosurgery to treat aneurysms is to send a microcatheter into the cavity of the aneurysm, and occlude the aneurysm with materials such as coils and medical glue, so as to prevent the bleeding and recurrence of the aneurysm and make the patient recover. This method has outstanding advantages such as less trauma, less pain, quick recovery, low risk, and high success rate, and is widely accepted by patients. Some European and American countries have adopted endovascular neurosurgery as the first choice for the treatment of aneury...

Claims

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Application Information

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IPC IPC(8): A61B17/12
CPCA61B17/12145A61B17/12113A61B2017/00871
Inventor 宋成利
Owner UNIV OF SHANGHAI FOR SCI & TECH
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