Blood Pressure-Driven Irrigation Pressure Control
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Solution Overview
Problem
Existing endoscopic surgery systems face challenges in dynamically controlling irrigation and insufflation pressures to avoid tissue damage while maintaining optimal visibility, as they often rely on fixed pressure settings that can lead to excessive pressure and tissue swelling, and fail to adjust to the individual patient's perfusion pressure needs.
Innovation Solution
A pressure control system that uses a control signal derived from a blood pressure measuring apparatus, multiplied by a correlation factor representing arterial pressure, to dynamically adjust the pressure delivered by irrigation or insufflation pumps, ensuring it remains just above the perfusion pressure to prevent blood leakage and minimize tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed pressure settings are used for irrigation and insufflation, then the system is simple to operate, but tissue damage and swelling occur due to excessive pressure
Solution Approach 1:
The patent implements dynamic pressure control by continuously monitoring the patient's blood pressure and automatically adjusting the irrigation and insufflation pressure in real-time. The system transitions from static fixed pressure settings to dynamic adaptive pressure control, where the pressure is continuously modified based on the correlation between blood pressure and tissue perfusion pressure, thereby preventing tissue damage while maintaining ease of operation through automation.
Solution Approach 2:
The system employs feedback control by continuously measuring the patient's blood pressure and using this information to adjust the irrigation and insufflation pressure. The control unit receives blood pressure data, calculates the appropriate pressure level using a correlation factor, and automatically adjusts the pump output accordingly. This closed-loop feedback mechanism ensures pressure remains within safe limits while maintaining optimal visibility.
2Illumination intensity
If higher pressure is used to improve surgical visibility through distension, then visibility is improved, but tissue swelling and damage risk increases
Solution Approach 1:
The patent dynamically changes the pressure parameter based on the patient's real-time blood pressure measurements. By establishing a correlation between blood pressure and tissue perfusion pressure, the system adjusts the irrigation and insufflation pressure to maintain optimal distension for visibility while staying below the threshold that causes tissue swelling. The pressure is continuously modified to match the patient's physiological state.
Solution Approach 2:
The system uses the patient's blood pressure as a proxy or copy to estimate the tissue perfusion pressure in the surgical field. By measuring blood pressure at a convenient location and using a correlation factor to represent the relationship between blood pressure and local tissue pressure, the system indirectly controls the pressure in the body cavity without direct measurement, thereby preventing tissue damage while maintaining visibility.
3Device complexity
If fixed pressure target systems are used, then the system is simple to control, but the pressure cannot be flexibly changed to meet varying surgical needs and tissue pressure builds up due to indirect measurement delays
Solution Approach 1:
The system implements continuous feedback control by monitoring blood pressure in real-time and automatically adjusting pressure settings. This enables flexible adaptation to varying surgical needs without requiring complex manual reconfiguration. The feedback loop continuously compares the actual pressure with the target pressure derived from blood pressure measurements and makes automatic adjustments, providing both simplicity and adaptability.
Solution Approach 2:
The patent transforms the static fixed pressure target system into a dynamic adaptive system that automatically adjusts pressure based on real-time blood pressure measurements. The system dynamically modifies pressure settings to match the patient's physiological state and surgical requirements, eliminating the delays and hysteresis associated with indirect pressure measurement while maintaining system simplicity through automation.
4Device complexity
If indirect pressure measurement is used in the irrigation system, then the measurement is simple to implement, but the reaction time is delayed due to volume/pressure hysteresis of tissue
Solution Approach 1:
The patent uses blood pressure as an intermediary parameter to indirectly determine the appropriate irrigation and insufflation pressure. Instead of directly measuring tissue pressure with complex sensors, the system measures blood pressure (which is easier to obtain) and uses a correlation factor to estimate the tissue perfusion pressure. This intermediary approach provides faster response times because blood pressure can be monitored continuously without the delays associated with direct tissue pressure measurement and tissue hysteresis.
Data Source
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AI summary
A device (1) for irrigation and/or insufflation during endoscopic surgery/procedures in a body cavity (3), comprising a first fluid pump device (21) in fluid connection with the body cavity (3) via a fluid line (10), wherein the first fluid pump device (21) is adapted to deliver a fluid to the body cavity (3) a second fluid pump device (18) in fluid connection with the body cavity (3) connected via a fluid line (16), wherein the second fluid pump device (18) is adapted to move a fluid from the body cavity (3), a control unit (19) connected to the first fluid pump device (21) and/or the second fluid pump device (18), a blood pressure measuring device (20), connected to the control unit (19), wherein the blood pressure measuring device (20) is adapted to measure a systemic blood pressure, wherein the control unit (19) is adapted to derive a control signal based on a signal from the blood pressure measuring device (20), wherein the control unit (19) is further adapted to send the control signal to the first fluid pump device (21) and/or the second fluid pump device (18), wherein the control signal is derived by processing the signal from the blood pressure measuring device (20) by using a correlation factor stored in the device (1) wherein the correlation factor is dependent on the relationship between a blood pressure measurement signal, and a perfusion pressure of the body cavity (3), wherein the first fluid pump device (21) and/or the second fluid pump device (18) is adapted to control the pressure in the body cavity (3) based on said control signal received from the control unit (19).