Access Port with Radial Needle for Pericardium Fixation
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Solution Overview
Problem
Existing access port technologies with elastic members, such as balloons or superelastic expanding members, are ineffective for retaining access in thin, highly stretchable biological membranes like the pericardium.
Innovation Solution
An access port comprising a tubular member with a needle-like member and a manipulating mechanism that allows the needle tip to project radially outward for fixation and retract for removal, ensuring stable attachment and detachment from the biological membrane without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic members such as balloons or superelastic expanding members are used for retention, then effective retention is achieved for relatively thick tissue walls, but the retaining mechanism does not function effectively for thin, highly stretchable biological membranes such as pericardium
Solution Approach 1:
The invention changes the retention mechanism from elastic expansion (balloon) or superelastic deformation to a mechanical hooking action. The needle-like member with tip projects radially outward to hook into the tissue, transforming the retention principle from pressure-based to geometry-based, enabling effective retention across different tissue thicknesses including thin membranes.
Solution Approach 2:
The needle-like member is designed to be movable relative to the tubular member, allowing it to project radially outward for retention and retract for removal. This dynamic configuration enables the same device to effectively retain both thick tissue walls and thin biological membranes by adjusting the needle's projection state.
2Reliability
If the needle-like member tip is projected radially outward for fixation, then stable attachment to the biological membrane is achieved, but the device complexity increases due to the manipulating means required for switching states
Solution Approach 1:
The needle-like member is positioned on the outer surface of the tubular member and can project radially outward, utilizing the radial dimension for retention. This dimensional approach allows simple hooking action without requiring complex manipulating mechanisms, as the radial projection itself provides the fixation function.
Solution Approach 2:
The needle-like member's tip, when projected radially outward, automatically hooks into the biological membrane during insertion, providing self-retention without requiring additional active manipulation. The device uses its own structural configuration to achieve fixation.
3Reliability
If the needle-like member is used to hook the biological membrane for fixation, then the tubular member can be securely retained, but removal requires additional steps to release the engagement and retract the tip
Solution Approach 1:
The needle-like member is designed with dynamic movability, allowing it to be retracted into the tubular member for removal. This dynamic configuration enables easy removal by simply retracting the needle, which releases the hooking engagement from the biological membrane without requiring complex release mechanisms.
Solution Approach 2:
The needle-like member can be extracted or retracted into the tubular member to release the retention function. This extraction action cleanly separates the retention mechanism from the biological membrane, enabling simple and safe removal without damaging the tissue.
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 access port effectively secures and removes the tubular member from the pericardium without damaging it, allowing for the introduction and removal of instruments through the membrane.
Implementation Method 1
the tip of the needle-like member projecting radially outwards passes through the biological membrane, and the needle-like member is hooked to the biological membrane and is fixed thereto so as not to come off
Implementation Method 2
a manipulating means for switching between a state in which the tip is projected and a state in which the tip is not projected
Data Source
AI summary
An access port is fixed to a biological membrane, such as a pericardium, in a state in which it penetrates the biological membrane. Provided is an access port (1) including a tubular member (2) having a through-hole (2a) passing therethrough in an axial direction, a needle-like member (3) having a tip (3c) pointing toward a rear end of the tubular member (2) and mounted to an outer surface of the tubular member (2), and a manipulating means (4) for switching between a state in which the tip (3c) is projected and a state in which it is not projected.