Absorbable Surgical Mesh Strength Retention and Degradation Control
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Solution Overview
Problem
Current surgical meshes face challenges in achieving an ideal balance between strength retention and timely disappearance from the body, with existing products often resulting in long-term complications such as chronic pain, foreign body sensation, and infections due to over-engineering for strength, and biocompatibility issues related to sterilization methods and material degradation.
Innovation Solution
A method for producing an absorbable surgical mesh using polydioxanone fibers with specific parameters such as heat treatment, sterilization cycles, and manufacturing processes to create a mesh that retains strength for at least three months and disappears within six months, minimizing long-term adverse events, while maintaining sterility and biocompatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surgical mesh is over-engineered for strength, then strength retention is improved, but long-term complications such as chronic pain, foreign body sensation, and infections increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of polydioxanone (specifically 85-200 kDa) and the fiber diameter (5-0 USP), which directly control the degradation timeline. This allows the mesh to provide adequate strength during the critical healing period while ensuring complete absorption within 6-12 months, preventing long-term complications associated with permanent meshes.
Solution Approach 2:
The patent implements the discarding principle through complete biodegradation of the mesh. The polydioxanone material is designed to be fully absorbed by the body over time, with the mesh providing temporary support during healing and then completely disappearing. This eliminates the need for removal surgery and prevents long-term foreign body complications while the tissue recovers and assumes full load-bearing responsibility.
2Duration of action of stationary object
If surgical mesh degrades quickly, then timely disappearance is improved, but strength retention deteriorates
Solution Approach 1:
The patent resolves this contradiction through precise parameter control of the polydioxanone polymer. By specifying molecular weights in the range of 85-200 kDa and using 5-0 USP fiber diameter, the mesh achieves an optimal balance where sufficient strength is maintained for at least 3 months to support tissue healing, while complete degradation occurs within 6-12 months. This parameter optimization ensures neither premature failure nor excessive persistence.
3Reliability
If sterilization methods are applied to achieve sterility, then sterility is improved, but biocompatibility issues arise due to material degradation
Solution Approach 1:
The patent applies the disposable principle by using a fully absorbable polymer that completely degrades within a predictable timeframe. The mesh serves its sterilized function during the immediate post-operative period and then naturally disappears through biodegradation, eliminating the need for permanent foreign bodies that could cause long-term biocompatibility issues. The material is designed to be completely consumed by physiological processes.
Solution Approach 2:
The patent converts the potential harm of sterilization-induced material changes into a benefit by selecting polydioxanone, a polymer that maintains its biocompatibility throughout the sterilization process and subsequent degradation. The sterilization methods (ethylene oxide, gamma radiation, or autoclaving) are applied knowing they may cause some molecular weight reduction, but the selected polymer and its controlled degradation pathway ensure that any changes actually facilitate predictable, complete absorption without toxic byproducts or chronic inflammation.
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 mesh achieves an ideal balance of strength retention and absorption, reducing the risk of long-term complications by transferring load-bearing responsibility to surrounding tissue as it degrades, with improved biocompatibility and reduced inflammatory reactions, supported by in vitro and in vivo testing.
Implementation Method 1
The mesh has an absorption profile such that the mesh retains strength for at least three months after an insertion of the mesh into living tissue, continues to be present in the living tissue from approximately three months after the insertion and approximately six months after insertion, and then disappears relatively soon after six months
Data Source
AI summary
A method for creating a surgical mesh includes heat treating a plurality of fibers; knitting the plurality of fibers into a mesh; and heat treating the mesh by applying heat at a temperature that falls within a range of 65 degrees Celsius to 110 degrees Celsius while subjecting the mesh to a tension that falls in a range of 4.0 Newtons per centimeter (N/cm) to 32.0 N/cm for a period of time that falls in a range of 1 hour to 9 hours.