Bioresorbable Multilayer Film for Bone Defect Sealing
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Solution Overview
Problem
Existing methods for covering bone defect sites require multiple operations for film removal and suffer from low stability of bioresorbable cover layers, which hinder effective bone healing and regeneration.
Innovation Solution
A multilayer film is developed with a thermally and mechanically connected bioresorbable molding layer and cover layer, where the cover layer is pressed onto the molding layer using a heated pressing device, forming a firm connection that allows the film to be completely resorbed in the body, eliminating the need for a second operation for removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a Teflon membrane is used for shaping and covering bone defect sites, then the shape stability and cavity formation are improved, but a second operation is required to remove the membrane after bone healing
Solution Approach 1:
The patent changes the material parameter of the membrane from non-bioresorbable Teflon to bioresorbable materials, allowing the membrane to be degraded and absorbed by the body over time, thereby eliminating the need for a second removal operation while maintaining shape stability during the healing period
Solution Approach 2:
The patent employs a disposable bioresorbable membrane that serves its shaping and protective function temporarily during bone healing, then degrades and is absorbed by the body, replacing the permanent Teflon membrane that requires surgical removal
2Loss of time
If bioresorbable cover layers are used to avoid second operation, then the number of operations is reduced, but the shape stability is excessively low to maintain structure during bone healing
Solution Approach 1:
The patent creates a composite membrane structure combining multiple bioresorbable materials with different properties - one layer provides shape stability and structural support, while another layer provides coverage and sealing, together achieving both shape stability and bioresorbability that neither material could provide alone
Solution Approach 2:
The patent divides the membrane into multiple functional layers, with each layer having specific properties (shape stability, sealing, bioresorbability), allowing the composite structure to achieve overall shape stability while maintaining the ability to be completely absorbed by the body
3Strength
If a multilayer film with thermal and mechanical connection is used, then the firm connection and shape stability are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines thermal connection and mechanical connection methods into a unified manufacturing process, using heat to activate the bioresorbable material's adhesive properties and simultaneously applying mechanical pressure to form strong bonds between layers, achieving firm connection through integrated processing
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 multilayer film provides stable coverage and sealing of bone defect sites, facilitating bone regeneration without the need for additional surgeries, as both layers are bioresorbable and can be completely broken down in the body, ensuring effective bone growth and healing.
Implementation Method 1
the molding layer and/or the at least one cover layer is or are heated by applying heat from an external heat source (for example, a heated pressing device) above the respective melting point, whereby the molding layer and the cover layer fuse together
Implementation Method 2
which are dissolved by the body again by virtue of their bioresorbability, for example by hydrolysis
Data Source
AI summary
A method produces a multilayer film for covering a bone defect site. The film comprises at least one substantially completely bioresorbable covering layer, and the at least one covering layer is placed on a thermally deformable and substantially completely bioresorbable molding layer. The at least one covering layer is connected to the molding layer thermally and/or mechanically, preferably in a compressed manner. Mandrel-like protrusions are arranged on the molding layer, and the protrusions are pressed into the at least one covering layer by the placement of the at least one covering layer on the molding layer and/or pushed through the at least one covering layer. Alternatively or in addition to the protrusions, substantially completely bioresorbable connection devices, preferably rivets or pins, are pushed through the molding layer and the at least one covering layer.