Twisted Non-Circular Surgical Thread for Tissue Anchoring
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Solution Overview
Problem
Commercial surgical threads for embedding or lifting often cause a foreign body sensation and can injure target tissue, leading to a potential severe immune response.
Innovation Solution
A surgical thread with a modified cross-section fiber in a twisted state, which has a non-circular cross-section and a larger surface area per unit length, improving cell adhesion and proliferation, and reducing the risk of immune response due to its smoother surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If commercial surgical threads with barb structures, fish bone or zigzag structures are used, then the thread can anchor or maintain in the target tissue, but the thread causes foreign body sensation and can injure the target tissue, triggering severe immune response
Solution Approach 1:
The patent changes the geometric parameters of the fiber cross-section from circular to non-circular shapes (such as triangular, rectangular, or star-shaped cross-sections). This parameter change increases the surface area per unit length by at least 20%, enhancing cell adhesion and proliferation while eliminating sharp protrusions that cause tissue injury and foreign body sensation.
Solution Approach 2:
The patent uses composite fiber structures combining non-circular cross-section geometry with twisted state configuration. This composite approach creates a thread that achieves anchoring through increased surface area and friction rather than through sharp barbs or protrusions, thereby maintaining tissue compatibility while providing sufficient anchoring capacity.
2Device complexity
If circular cross-section fibers are used, then the thread structure is simple, but the surface area per unit length is smaller, reducing cell adhesion and proliferation efficacy
Solution Approach 1:
The patent modifies the cross-sectional shape parameter from circular to non-circular geometries (triangular, rectangular, star-shaped, etc.). This simple geometric parameter change significantly increases the surface area per unit length without adding structural complexity, as the non-circular fibers remain single-strand constructions without additional components or mechanisms.
3Strength
If barbs, fish bone or zigzag structures are used, then the thread can anchor in tissue, but the structures are thinner and more vulnerable for digestion, having difficulties adhering to or staying in the tissue for a long period
Solution Approach 1:
The patent changes the cross-sectional geometry parameter to non-circular shapes with increased surface area. This parameter change allows the fiber to maintain greater thickness while achieving superior anchoring through increased surface area and twisted-state friction, thereby resisting enzymatic digestion longer and maintaining structural integrity in the tissue for extended periods.
Solution Approach 2:
The patent employs a twisted state configuration of the non-circular cross-section fiber, creating a curved, helical structure along the longitudinal axis. This curvature generates frictional resistance and mechanical interlocking with surrounding tissue, enhancing both anchoring capacity and duration of retention without requiring thin, vulnerable protrusions.
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 surgical thread achieves enhanced cell adhesion and proliferation, reduces the foreign body sensation, and minimizes the risk of immune response, while maintaining mechanical strength and longevity in tissue.
Implementation Method 1
the twisted state of the modified cross-section fiber of the present invention can further increase the degree of unevenness on the surface of the surgical thread of the present invention and the friction force thereof along the longitudinal direction
Implementation Method 2
the surface area per unit length of the modified cross-section fiber adopted in the present invention is larger and can be at least 20% larger than that of the circular cross-section fiber, which increases the contact area between the surgical thread of the present invention and target cells in the tissue
Data Source
AI summary
The present invention provides a surgical thread, comprising a modified cross-section fiber, wherein the modified cross-section fiber is in a twisted state. The surgical thread of the present invention has advantages of good coefficient of kinetic friction, good tensile strength, good elongation rate and good softness, and good safety, comprising no inflammatory potential, no cytotoxicity, no pyrogen, no acute systemic toxicity and no intradermal irritation potential, and has the efficacy of promotion of collagen formation, thereby being suitable for embedding in the face. The present invention further provides a cosmetic treatment and a manufacturing method for the surgical thread.