Gelable Cellulose Nonwoven Fabric for Adhesion Prevention
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Solution Overview
Problem
Medical nonwoven fabrics prepared by the paper making process lack sufficient strength and dimensional stability, and conventional adhesion prevention barriers are ineffective in controlling gelation time and visibility during surgical procedures.
Innovation Solution
A medical nonwoven fabric comprising gelable cellulose derivative short-cut fibers with controlled micropores, prepared using the paper making process, and a composite nonwoven fabric laminate with a biodegradable polymer layer for improved dimensional stability and visibility, along with a method for preparing these fabrics that includes chemical treatment and ultrasound bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If wet-laid nonwoven fabric is prepared by the paper making process using short-cut fibers, then uniform fiber dispersion and micropore formation are improved, but fabric strength and dimensional stability deteriorate
Solution Approach 1:
The patent applies composite materials by combining gelable cellulose derivative short-cut fibers with a binder fiber network. The binder fibers (such as polyvinyl alcohol or carboxymethyl cellulose) create a scaffold that reinforces the weak short-cut fiber matrix, while the gelable cellulose derivatives fill the micropores and gel upon contact with body fluids. This composite structure resolves the contradiction by providing both the uniform dispersion/micropore formation characteristics of wet-laid short-cut fibers and the dimensional stability/fabric strength provided by the binder network.
Solution Approach 2:
The patent applies local quality by creating distinct functional zones within the nonwoven fabric. The binder fibers form a continuous network providing structural integrity and dimensional stability, while the gelable cellulose derivative short-cut fibers are distributed within the micropores to provide gelation functionality. This spatial differentiation of material properties allows the fabric to simultaneously achieve good dimensional stability from the binder network and adequate fabric strength through the synergistic interaction between binder and gelable fibers.
2Reliability
If gelable cellulose derivative short-cut fibers are used to control gelation time through capillary action, then adhesion prevention effectiveness is improved, but fabric strength deteriorates
Solution Approach 1:
The patent uses composite materials where binder fibers provide structural strength while gelable cellulose derivative short-cut fibers provide gelation functionality. The binder network bears the mechanical load, allowing the gelable fibers to focus on adhesion prevention through controlled gelation. This functional division resolves the contradiction by assigning different roles to different material components.
Solution Approach 2:
The patent utilizes porous materials by maintaining micropore structures formed during wet-laid processing. These micropores are filled with gelable cellulose derivative short-cut fibers that undergo capillary action upon contact with body fluids, enabling controlled gelation. The porous structure is preserved within the binder fiber network, allowing the fabric to achieve reliable adhesion prevention through capillary-driven gelation while the binder network maintains fabric strength.
3Ease of operation
If nonwoven fabric is dyed to improve visibility during surgical procedures, then surgical convenience is improved, but fabric strength may deteriorate
Solution Approach 1:
The patent applies preliminary action by incorporating dyeing into the fabric preparation process before the fabric is used in surgical procedures. The dye is applied to the nonwoven fabric during manufacturing, ensuring uniform color distribution and adequate drying time before the fabric is sterilized and packaged. This preliminary dyeing ensures high visibility during surgery without requiring post-manufacturing treatments that could compromise fabric strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a porous, biocompatible medical nonwoven fabric with controlled gelation time and enhanced visibility, suitable for use as an adhesion prevention barrier, improving surgical procedures and dimensional stability.
Implementation Method 1
the optimal conditions to improve the strength of nonwoven fabric allows preparation of a medical nonwoven fabric comprising gelable cellulose derivative short-cut fibers and facilitates the control of the gelation time through capillary actions caused by the micropores between the gelable cellulose derivative short-cut fibers
Implementation Method 2
facilitates the control of the gelation time through capillary actions caused by the micropores between the gelable cellulose derivative short-cut fibers
Implementation Method 3
a composite nonwoven fabric laminate with a biodegradable polymer layer for improved dimensional stability and visibility, along with a method for preparing these fabrics that includes chemical treatment and ultrasound bonding
Data Source
AI summary
The present invention relates to a medical nonwoven fabric comprising gelable cellulose derivative short-cut fibers as prepared by the paper making process, a preparation method thereof, and an adhesion prevention barrier using the same. The present invention provides a single phase of medical nonwoven fabric comprising gelable cellulose derivative short-cut fibers, to induce capillary action of micropores formed between the fibers and thereby control the gelation time, and provides a composite nonwoven fabric formed by laminating a nonwoven fabric layer comprising a different kind of biodegradable polymer material not susceptible to gelation on the single-phase of medical nonwoven fabric comprising gelable cellulose derivative short-cut fibers, thereby improving dimensional stability and convenience of surgical procedure. The present invention further provides a dyed medical nonwoven fabric to improve visibility, allowing easiness of recognizing the placement or location of the medical nonwoven fabric.