Applicator Sheath Side Holes for Laparoscopic Pressure Control
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Solution Overview
Problem
Conventional applicators for anti-adhesion materials and biological tissue adhesives in laparoscopic operations may fail to suppress abdominal cavity pressure due to closure of sheath openings and side holes by liquid, disrupting gas exhaust and pressure control.
Innovation Solution
The applicator features multiple side holes spaced along the sheath's circumference, providing multiple exhaust routes for abdominal cavity gas, ensuring effective pressure suppression regardless of usage patterns and potential liquid ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single side hole configuration is used in the sheath, then the structure is simple, but the exhaust function may be compromised if the opening is closed by liquid
Solution Approach 1:
The single side hole is segmented into multiple side holes (first side hole and second side hole) positioned at different locations along the sheath. This segmentation ensures that if one hole is blocked by liquid, the other holes can still provide exhaust function, thereby improving reliability without significantly increasing complexity.
Solution Approach 2:
Different side holes are positioned at different locations along the sheath with different exhaust capacities. The first side hole has a larger exhaust capacity than the second side hole, creating local quality variations that optimize the overall exhaust function while maintaining structural simplicity.
2Reliability
If the distal end portion of the sheath is dipped in liquid, then the opening and side holes may be closed up, but multiple exhaust routes should be provided to maintain pressure control
Solution Approach 1:
Multiple side holes are pre-positioned at different locations along the sheath before use. This preliminary configuration ensures that even if liquid ingress blocks some holes, sufficient exhaust routes remain available to maintain pressure control, addressing the harmful effect of liquid ingress in advance.
Solution Approach 2:
The multiple side hole configuration acts as a cushioning backup system. If the primary exhaust route (distal end opening) is blocked by liquid, the secondary exhaust routes (side holes) provide compensatory exhaust capacity, cushioning against the harmful effect of blocked primary exhaust.
3Reliability
If side holes are positioned at the proximal end side, then exhaust function is provided, but the exhaust capacity may be insufficient compared to distal end positioning
Solution Approach 1:
Side holes are positioned at different locations (proximal and distal ends) with different exhaust capacities. The first side hole at the distal end has larger exhaust capacity, while the second side hole at the proximal end has smaller exhaust capacity. This local quality differentiation optimizes the overall exhaust function by combining holes with varying capacities at strategic positions.
Solution Approach 2:
The exhaust function is segmented into multiple side holes with different capacities and positions. This segmentation allows the system to provide sufficient total exhaust capacity while distributing the exhaust function across multiple locations, ensuring reliability even if some holes are blocked.
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
This design ensures consistent gas exhaust and pressure control, maintaining abdominal cavity pressure within the desired range of 8 to 12 mmHg, even if one exhaust route is compromised, thereby preventing pressure rise during treatment.
Implementation Method 1
gas is injected into the abdominal cavity upon treatment in which anti-adhesion material, biological tissue adhesive or the like is used. Although the pressure in the abdominal cavity is raised by the gas, the gas in the abdominal cavity is exhausted to the outside of the body through the side holes.
Data Source
Figure 1
Figure 2~3(b)
Figure 4(a)~5(c)
AI summary
An applicator is inserted into a living body and applies mixed solution to a region in the living body. The applicator includes a nozzle including an elongated nozzle main body to which gas and a plurality of kinds of liquids are supplied and a nozzle head provided at a distal end of the nozzle main body and configured to jet mixed solution of the gas and the plurality of kinds of liquids supplied to the nozzle main body, and a sheath in which the nozzle main body is fitted for relative movement along a longitudinal axial direction of the nozzle main body. A gap is provided between the nozzle main body and the sheath. The gap functions as an exhaust path for exhausting gas in the living body to the outside of the body when the pressure in the living body rises. The sheath has a plurality of side holes formed on a circumference thereof at a plurality of positions spaced by an equal interval along a longitudinal axial direction of the sheath, each of the side holes communicating with the gap.