Porous Sheet Fixing Structure for Bacterial-Resistant Anchoring
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Solution Overview
Problem
Existing fixtures for medical tubes and drivelines fail to prevent bacterial intrusion and misalignment due to material deformation and slow fixation to the skin, leading to delayed healing.
Innovation Solution
A fixing structure comprising a porous sheet with a non-resorbable material, a cylindrical insertion part, and a fixing filamentary body sewn to the sheet to form a protruded and recessed structure that resists relative movement, promoting early fixation and bacterial prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flange part made of flexible material like PTFE is used in the fixture, then the flange part can be easily formed and fitted, but the flange part deforms under fastening force generating gaps that allow bacterial intrusion
Solution Approach 1:
The patent changes the material parameter from flexible material (PTFE) to rigid material (synthetic resin or metal), eliminating the deformation issue while maintaining ease of formation through molding or shaping processes. This resolves the contradiction by selecting a material that inherently maintains its shape under fastening forces.
Solution Approach 2:
The patent employs composite material construction where the flange part is integrated with the fixture body as a unified structure, or combines rigid flange with flexible sealing elements. This composite approach maintains formation ease while preventing deformation-induced gaps.
2Reliability
If the flange part is fixed to the skin using tissue penetration, then the fixation can be achieved, but it takes time for complete fixation and movement before complete fixation delays healing
Solution Approach 1:
The patent incorporates a protrusion structure on the flange part that performs preliminary anchoring action into the skin tissue, creating immediate mechanical interlocking before full healing occurs. This preliminary action prevents movement during the critical early healing period.
Solution Approach 2:
The patent uses a curved or rounded protrusion structure on the flange part that facilitates smoother tissue penetration and creates a more effective mechanical anchor in the skin tissue, accelerating the fixation process and reducing movement during healing.
3Strength
If the flange presser and fixing nut are used to sandwich the flange part, then the flange part can be secured to the cylindrical part, but the flexible flange material deforms under fastening force
Solution Approach 1:
The patent changes the material parameter of the flange part from flexible to rigid, allowing it to withstand fastening forces without deformation. The rigid material maintains its shape and dimensional stability under the applied fastening forces.
Solution Approach 2:
The patent merges the flange part with the cylindrical part as an integrated unified structure, eliminating the need for separate fastening operations. This integration ensures that the flange maintains its shape stability while being securely attached to the cylindrical part.
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 structure effectively suppresses bacterial intrusion and misalignment, allowing for early and stable fixation to the target site, promoting healing by cell growth and anchoring.
Implementation Method 1
a fixing filamentary body composed of a filamentary body sewn to the sheet so as to fix the sheet and the sandwiching part, wherein the fixing filamentary body is sewn to a surface of the sheet so as to form a protruded and recessed structure providing resistance to a relative movement
Data Source
AI summary
The fixing structure of the present invention is a structure, comprising: a porous sheet composed of a non-resorbable material having biocompatibility; a cylindrical insertion part for guiding an insertion member from inside of a living body to outside of the living body; a sandwiching part for sandwiching a peripheral portion around the opening of the sheet in a thickness direction of the sheet and being fixed to the insertion part; and a fixing filamentary body composed of a filamentary body sewn to the sheet so as to fix the sheet and the sandwiching part.