A kind of preparation method of covered implant

An implant and coating technology, which is applied in the field of medical devices, can solve the problems of increasing the inner and outer diameter of the coated implant, the feeling of foreign body in the human body, and low coating strength, so as to ensure the coating effect, the thickness of the coating is small, Soft film effect

Active Publication Date: 2021-11-16
北京爱霖医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the film-covered implants currently on the market, some of the inner and outer layers of the film are fixed on the frame by suturing, and some are fixed on the frame by thermocompression, and the pure thermocompression of suture and simple The physical coating method has great disadvantages. The inner and outer coatings not only greatly increase the overall inner and outer diameter of the coated implant, but also have low coating strength and are easy to fall off, resulting in the risk of exposing the metal frame. Human body produces foreign body sensation and exclusivity

Method used

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  • A kind of preparation method of covered implant
  • A kind of preparation method of covered implant
  • A kind of preparation method of covered implant

Examples

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preparation example Construction

[0062] The invention provides a method for preparing a covered implant, comprising the following steps:

[0063] Combination steps:

[0064] Wrap the inner film on the supporting mold;

[0065] Sleeve the implant on the supporting mold with the inner film wrapped around it;

[0066] wrapping an outer covering over the implant to form an implant component;

[0067]Sleeve a heat-shrinkable tube on the implant assembly;

[0068] Heating condensation steps:

[0069] heating, using the heat-shrinkable tube to condense the implant component, so that the inner layer film and the outer layer film are bonded and pressed together under the condensation extrusion of the heat-shrinkable tube, so that coating the implant;

[0070] Cooling and disassembly steps:

[0071] After the implant assembly and the heat-shrinkable tube are cooled, the heat-shrinkable tube and the supporting mold are removed to obtain a covered implant.

[0072] The coating of the implant in the present inventi...

Embodiment 1

[0082] This example is illustrated by the preparation of covered vascular stents. Among the existing surgical methods and methods of vascular intervention, percutaneous transcatheter intervention, implantation of various artificial vascular stents, artificial blood vessels, artificial valves and other implants have become the mainstay of treatment. An important method for vascular stenosis, hemangioma, and valvular disease, especially the application of covered vascular stents is becoming more and more extensive. For the covered stent graft prepared by purely physical coating method, the increase of the inner and outer diameter not only leads to the obstruction of blood flow after the covered vascular stent is implanted in the blood vessel, but also increases the interventional delivery catheter used for the pre-installed stent. , resulting in unnecessary additional complications; under the long-term blood flow, the inner and outer layers of the stent have a great risk of teari...

Embodiment 2

[0097] This example illustrates the preparation of a membrane-covered vena cava filter. The Vena Cava Filter (VCF) is a device similar to a filter and is usually deployed in the inferior vena cava to physically intercept floating thrombus and prevent A deep vein thrombosis travels to the lungs causing pulmonary thromboembolism. Since the emergence of the Mobin-Uddin umbrella VCF in 1967, VCF has made great progress in structural design and performance, and has become more and more widely used clinically. All VCFs on the Internet have some disadvantages that affect clinical development. Specifically: First, there is a risk of rupture of the umbrella-shaped side branches under the washing of the blood flow. The broken umbrella-shaped side branches flow in the human blood vessels and enter the heart, which will be fatal to the patient. Second, in order to prevent the filter from shifting, there will be some anchors at the end of the umbrella-shaped side branches for fixation in t...

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Abstract

The invention discloses a preparation method of a film-coated implant, which comprises the following steps: wrapping an inner layer film on a support mold; setting an implant on the support mold wrapped with an inner layer film; Wrap the outer film on the implant to form the implant component; set the heat shrinkable tube on the implant component; use an external heating device to heat the heat shrinkable tube and the implant component, and the heat shrinkable tube is heated Internally extruded implant components, the polyethylene layer in the implant components begins to melt and be extruded after being heated to 120°C, so that the inner and outer coatings can be condensed and extruded by the heat-shrinkable tube and the effect of the external heating device The lower bonding and pressing are integrated to cover the implant; after the implant component and the heat-shrinkable tube are cooled, the heat-shrinkable tube and the supporting mold are removed to obtain a covered implant. The film-covered implant obtained by the preparation method of the present invention has better biocompatibility, basically has no bioreactivity after being implanted in the human body, and eliminates the foreign body sensation and exclusion reaction of the human body to the greatest extent.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a method for preparing a membrane-covered implant. Background technique [0002] The film-covered implant generally includes a metal frame and inner and outer films respectively covering the inner and outer surfaces of the metal frame. In the film-covered implants currently on the market, some of the inner and outer layers of the film are fixed on the frame by suturing, and some are fixed on the frame by thermocompression, and the pure thermocompression of suture and simple The physical coating method has great disadvantages. The inner and outer coatings not only greatly increase the overall inner and outer diameter of the implant, but also have low coating strength and are easy to fall off, resulting in the risk of exposing the metal frame. The human body produces a foreign body sensation and exclusivity. Contents of the invention [0003] Aiming at the problems existing in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/04A61F2/07B29C63/02
CPCA61F2/04A61F2/07A61F2002/072A61F2210/00A61F2240/001B29C63/02
Inventor 李超黄文和雷震肖剑张荣利
Owner 北京爱霖医疗科技有限公司
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