Trocar Differential Pressure Detection for Laparoscopic Safety
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Solution Overview
Problem
Current laparoscopic surgery methods face challenges in accurately controlling insufflation gas pressure within the body cavity, as restrictions in gas delivery can lead to unsafe conditions due to difficulty in detecting flow restrictions downstream of the trocar, potentially causing loss of visualization and safety hazards during surgery.
Innovation Solution
A trocar system equipped with two pressure sensors, one within the insufflation gas flow path and one outside it, allows for the detection of differential pressure, enabling the control of insufflation gas supply to prevent restrictions and maintain accurate cavity pressurization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pressure sensor is used in the flow path to control insufflation gas supply, then the control system is simple, but flow restrictions downstream of the trocar cannot be detected
Solution Approach 1:
The pressure measurement function is segmented into two separate sensors: one located in the flow path (outer lumen) and one outside the flow path (inner lumen). This segmentation allows independent measurement of pressure at different locations, enabling detection of pressure differentials that indicate flow restrictions while maintaining relatively simple individual sensor designs.
Solution Approach 2:
The pressure differential between the two sensors serves as an intermediary indicator of flow restrictions. Rather than directly measuring flow restriction, the system uses the pressure difference as a mediator to detect the presence of downstream obstructions, enabling indirect but effective monitoring of flow conditions.
2Measurement precision
If pressure control is not accurately maintained, then the insufflation system is simple to operate, but loss of visualization occurs which slows surgery and creates safety hazards
Solution Approach 1:
The system continuously monitors the pressure differential between the two sensors and uses this feedback to detect flow restrictions. When a restriction is detected (indicated by abnormal pressure differential), the system can alert the operator or adjust gas supply, ensuring accurate pressure control while providing automated monitoring that reduces operational burden.
Solution Approach 2:
The dual-sensor system automatically monitors itself for flow restrictions without requiring external intervention. The pressure differential measurement provides self-diagnostic capability, allowing the insufflation system to detect and respond to problems autonomously, maintaining precision while simplifying operator tasks.
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 system effectively detects and addresses flow restrictions, ensuring safe and accurate control of insufflation gas delivery, preventing unsafe conditions and maintaining optimal visualization during surgery.
Implementation Method 1
determining a differential pressure between a first pressure in the flow path of the trocar and a second pressure in the region of the trocar outside the flow path
Data Source
AI summary
According to one embodiment, a method includes providing a trocar having a flow path for passage of an insufflation gas and also having a region outside the flow path that is open at the distal end of the trocar. The method also includes supplying insufflation gas through the flow path of the trocar and determining a differential pressure between a first pressure in the flow path of the trocar and a second pressure in the region of the trocar outside the flow path. The method also includes controlling the supply of insufflation gas through the trocar based at least in part on the determined differential pressure.