Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof

A technology of polytetrafluoroethylene and manufacturing process, which is applied in medical science, flat products, and other household appliances, etc., can solve the problems of poor surface flatness, lower product purity, and insufficient overall strength, and achieve safe use, high purity, and The effect of simple process operation

Active Publication Date: 2021-12-28
SHANGHAI SUOKANG MEDICAL IMPLANTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current expanded polytetrafluoroethylene is a separator formed by a uniaxial stretching process, with uneven micropores and insufficient overall strength; the stretched expanded polytetrafluoroethylene sheet produces a "knot and fiber" structure, Poor surface flatness, small contact surface, and difficult bonding; the adhesive between expanded PTFE sheets is perfluorinated polyethylene propylene (FEP) emulsion or film, which reduces the purity of the product
Finally, there is a risk of contamination when the product is opened and used

Method used

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  • Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof
  • Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof
  • Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a kind of preparation method of the double-layer expanded polytetrafluoroethylene surgical isolation membrane that adds antibacterial agent, and its steps are as follows:

[0055] S1, preparing the first sheet 1 and the second sheet 2, the specific steps are as follows:

[0056] S1.1, below 20°C, use polytetrafluoroethylene dispersion resin as raw material, add extrusion aid and antibacterial agent, the mass ratio is polytetrafluoroethylene dispersion resin: extrusion aid: antibacterial agent=100: (20~50 ): (1-5), mix evenly, heat up to 30-50°C, and let stand for 8-24 hours to ensure full penetration of extrusion aid;

[0057] S1.2, heat up the mixed resin in step S1.1 to 25°C-35°C, and preform it into a billet shape for easy extrusion;

[0058] S1.3, heating the mouth temperature of the extruder to 40-60°C, and then extruding the resin formed in step S1.2 to form a sheet of 1.5-2.5 mm;

[0059] S1.4, roll the sheet prepared in step S1.3 at 50...

Embodiment 2

[0078] The present embodiment provides a multilayer expanded polytetrafluoroethylene surgical isolation membrane with a silica gel interlayer adding an antibacterial agent, and the steps are as follows:

[0079] Steps S1, S2, S4 are exactly the same as steps S1, S2, S4 in embodiment 1; S3, S5 are respectively:

[0080] S3, stack the pre-stretched first sheet 11, the silicone sheet 4, and the second sheet 2 in sequence, wherein the pre-stretched first sheet 11 and the second sheet 2 are stacked in two directions. The longitudinal directions of the sheets are at an angle of 90° to each other, and then the three are regarded as a whole, and the overlapping parts are trimmed into squares or rectangles, including:

[0081] S3.1, placing the longitudinal direction of the pre-stretched first sheet 11 and the longitudinal direction of the second sheet 2 perpendicular to each other, superimposing them, and then cutting them into the same size;

[0082] S3.2, adding a silica gel sheet ...

Embodiment 3

[0085] The present embodiment provides a multi-layer expanded polytetrafluoroethylene surgical isolation membrane with polytetrafluoroethylene emulsion as an adhesive by adding an antibacterial agent, and the steps are as follows:

[0086] Steps S1, S2, S4, S5 are exactly the same as steps S1, S2, S4, S5 in embodiment 1; S3 comprises:

[0087] S3, taking one of the pre-stretched first sheets 11 and the second sheet 2 to be superimposed, the superposition direction ensures that the longitudinal directions of the two sheets are at an angle of 90° to each other, and then the two are regarded as a whole pair of overlapping Parts are trimmed into squares or rectangles, and an adhesive (PTFE emulsion 3 in this example) is used between the two sheets, specifically:

[0088] S3.1, placing the longitudinal direction of the pre-stretched first sheet 11 and the longitudinal direction of the second sheet 2 perpendicular to each other, superimposing them, and then cutting them into the sam...

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Abstract

The invention discloses an expanded polytetrafluoroethylene surgical isolating membrane and a manufacturing process thereof, and the manufacturing process comprises the following steps: by taking polytetrafluoroethylene dispersion resin as a raw material, carrying out extrusion molding under the action of an extrusion aid, and preparing a first sheet and a second sheet with the thicknesses of 0.3-0.4 mm and 0.4-0.5 mm respectively through rolling; longitudinally pre-stretching the first sheet by 3-4 times; and overlapping the pre-stretched first sheet and the second sheet, enabling the overlapping direction to form an angle of 0-90 degrees in the longitudinal direction of the two sheets, and sequentially performing longitudinal stretching by 2-4 times, sintering, transverse stretching by 2-4 times, sintering and hot-pressing shaping under heating to prepare the expanded polytetrafluoroethylene surgical isolating membrane with different pore diameters on two sides. According to the manufacturing process of the expanded polytetrafluoroethylene surgical isolating membrane, the pre-stretching process and the two-way stretching process are adopted, the micropore size of the obtained sheet can be accurately controlled by controlling the stretching ratio, the sheet stacking direction, the adhesive type, the sintering temperature and the like, micropores are more uniform, and the material mechanical property and the clinical use effect are better.

Description

technical field [0001] The invention relates to the field of long-term implanted medical devices, in particular to an expanded polytetrafluoroethylene surgical isolation membrane and a manufacturing process thereof. Background technique [0002] Lumbar disc herniation and lumbar spinal stenosis are common clinical diseases. "Lamectomy" is a routine step in the surgical treatment of lumbar disc herniation, lumbar spinal stenosis and other spinal diseases. However, in some cases, the laminectomy Scar tissue formed during the healing process can protrude into the spinal canal, causing iatrogenic spinal stenosis. When the scar forms adhesions with the outer mold of the nerve root or the dura mater, resulting in compression, the symptoms of lumbago and leg pain may recur, resulting in failure of the operation, that is, "failed lower back surgery syndrome (FBSS)" occurs, and its occurrence rate is as high as 6%. ~15%. The formation of scar is the pathological basis of this pheno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32
CPCB32B27/322B32B27/08B32B7/12B32B9/00B32B9/045A61L31/048A61L31/14B29D7/01B32B2307/746B32B2307/7145B32B2307/54C08L27/18
Inventor 叶明李新华李赞
Owner SHANGHAI SUOKANG MEDICAL IMPLANTS
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