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Polyvinyl acetal foam material, preparation method thereof and cervical dilatation device

A technology of polyvinyl acetal and polyvinyl alcohol, which is applied in the field of medical devices, can solve the problems of difficult to meet the needs of clinical use, low water swelling rate, etc., and achieve the effects of decreased porosity, slow hydrolysis speed, and good resilience

Pending Publication Date: 2020-02-25
成都博创必成生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the expansion rods made of self-expanding materials currently used have the problem of low water swelling rate, which is difficult to meet the needs of clinical use.

Method used

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  • Polyvinyl acetal foam material, preparation method thereof and cervical dilatation device
  • Polyvinyl acetal foam material, preparation method thereof and cervical dilatation device
  • Polyvinyl acetal foam material, preparation method thereof and cervical dilatation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～22

[0065] Effect of raw materials on product performance

[0066] A method of preparing a polyvinyl acetal porous foam, comprising:

[0067] (1) Mix polyvinyl alcohol and water, stir at 200r / min, and heat at 97°C until the polyvinyl alcohol is completely dissolved;

[0068] (2) Control the temperature at 67°C, add the pore-forming agent, stir at 200r / min, and react for 5-20min;

[0069] (3) Control the temperature at 53° C., add the crosslinking agent, stir at 200 r / min, and react for 5 to 20 minutes; the crosslinking agent is formaldehyde or paraformaldehyde;

[0070] (4) Control the temperature at 50°C, add the acidic catalyst, stir at 200r / min, and react for 10-25min;

[0071] (5) Keep warm at 50°C for 6-12 hours;

[0072] (6) Treat the polyvinyl acetal porous foam with aqueous sodium hydroxide solution to pH=6-7, and remove residual formaldehyde with hydrogen peroxide.

[0073] The selection and amount of polyvinyl alcohol, the amount of water, the selection and amount of...

Embodiment 1、23～29

[0078] The influence of embodiment 1, 23~29 temperature conditions (polyvinyl acetal porous foam) on product performance

[0079] The difference between Examples 23-29 and Example 1 is only that the temperature conditions are different in the method for preparing polyvinyl acetal porous foam, the temperature for dissolving polyvinyl alcohol, the temperature for adding a pore-forming agent, the temperature for adding a crosslinking agent, and the temperature for adding an acidic catalyst , See Table 2 for the holding temperature.

[0080] Table 2

[0081]

Embodiment 30～56

[0083] Effect of cutting, drying and compression processes on product properties

[0084] The preparation method of polyvinyl acetal foam material comprises:

[0085] (1) Preparation of polyvinyl acetal porous foam.

[0086] (2) cutting;

[0087] (3) drying;

[0088] (4) compressed into a rod;

[0089] (5) Irradiation sterilization.

[0090] The polyvinyl acetal foam material is prepared by the above preparation method.

[0091] The cervical dilation device includes: the cervical dilation rod body; the cervical dilation rod body is the polyvinyl acetal foam material prepared by the above preparation method; the cervical dilation device is a cervical dilator or a cervical dilation rod.

[0092] Examples 30 to 39 respectively adopt wet cutting, dry cutting and freezing cutting to cut the polyvinyl acetal porous foam obtained in Example 1; freezing cutting is specifically: centrifuging the polyvinyl acetal porous foam in Example 1 and adding water to the polyethylene For th...

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Abstract

The invention discloses a polyvinyl acetal foam material, a preparation method thereof and a cervical dilatation device. The preparation method comprises the following steps: (1) preparing polyvinyl acetal porous foam: mixing raw materials, and reacting the obtained mixture to obtain the polyvinyl acetal porous foam, wherein the raw materials consist of polyvinyl alcohol, water, a cross-linking agent, a pore-forming agent and an acidic catalyst; (2) cutting the foam; (3) drying the foam; and (4) carrying out compression molding. The polyvinyl acetal foam material has the advantages of smooth and defect-free macroscopic surface, high surface layer toughness, safety to use, good water absorption, high tensile strength and good resilience, and can be used as a cervix uteri expansion rod bodyfor the cervical dilatation device.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a polyvinyl acetal foam material, a preparation method thereof and a cervical dilation device. Background technique [0002] The center of the cervix is ​​a long fusiform lumen that is slightly flattened from front to back, mainly composed of knot-pedicle tissue, and also contains smooth muscle fibers, blood vessels, and elastic fibers. During obstetrics and gynecology operations such as ring removal, ring removal, induced abortion, uterine curettage and other operations, because the cervical opening is tight during operation, it is often necessary to use a cervical dilator to expand the cervical opening to achieve the purpose of the operation. Clinically, cervical dilation rods of different diameters made of metal or hard plastic are traditionally used to dilate the cervix by physical rigid expansion. This method often results in longer operation time, greater pain for p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/14C08J9/26C08F8/28C08F16/06A61B17/42A61B17/02
CPCC08J9/26C08F8/28A61B17/42A61B17/02C08J2329/14C08J2403/02C08J2201/046A61B2017/4216A61B2017/00831A61B2017/00862C08F16/06
Inventor 万方杨华蓉李华黄猛张劲松李博
Owner 成都博创必成生物技术有限公司
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