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Publication Number
US-12214120-B2
Publication Date
2025-02-04
Expiration Date
Abstract
The present disclosure is directed to an insufflator which includes a controller, an insufflation line, a desufflation line, and one pressure sensor and one volume flow sensor associated with each of the insufflation line and the desufflation lines. The insufflation line is in fluid communication with a gas source and the desufflation line in fluid communication with a suction pump. Wherein the controller controls ventilation of a gas present in a patient by adjusting an amount of suction in the desufflation line as a function of pressure measurements obtained from the pressure sensors associated with the insufflation line and the desufflation line. Additionally, the controller includes an activation blocking system that prevents suction in the desufflation line when a pressure measured by means of the pressure sensor associated with the insufflation line is lower than a preset threshold value. Still further, the activation blocking system further prevents suction in the desufflation line when the pressure measured by means of the pressure sensor associated with the insufflation line and a pressure measured by means of the pressure sensor associated with the desufflation line are not identical.
Core Innovation
The invention relates to a laparoscopy insufflator/medical device for controlled ventilation of a gas present in a patient, including an insufflation line and a desufflation line. The device includes pressure and volume-flow sensing associated with each of the insufflation line and the desufflation line, and a controller that adjusts suction in the desufflation line based on pressure measurements obtained from the pressure sensors of both lines.
The controller activates suction and estimates an abdominal pressure of the patient using a mathematical observer model from the pressure sensor associated with the desufflation line. The controller compares the estimated abdominal pressure to a pressure measurement obtained from the pressure sensor associated with the insufflation line, and suction remains activated only when the values are identical, effectively a difference smaller than 2 mmHg, between the estimated abdominal pressure and the pressure measurement of the insufflation-line pressure sensor.
The controller includes an activation blocking system that prevents the suction in the desufflation line when the insufflation-line pressure measurement is lower than a preset threshold value, and further prevents suction when the insufflation-line and desufflation-line pressures are not identical. The document further describes validation and safety logic such as interrupting desufflation in intervals with pressure balancing, plausibility checks using expected pressure drop versus sucked-off volume flow, and optional synchronization with an observer model.
Claims Coverage
The independent claim is directed to a medical device with sensor-equipped insufflation and desufflation lines and controller logic that regulates suction using pressure estimation and identity checking, including activation blocking based on preset thresholds and pressure mismatch criteria. The independent claim includes multiple inventive features in combination; dependent claims further refine the observer implementation, gating/pausing logic, quantitative suction/pressure limits, and an additional validation cross-check using sucked-off gas volume versus abdominal pressure decrease.
Sensor-equipped insufflation and desufflation lines with pressure and volume flow sensing
a medical device including an insufflator with a controller, an insufflation line, a desufflation line, and one pressure sensor and one volume flow sensor associated with each of the insufflation line and the desufflation line; the insufflation line in fluid communication with a gas source and the desufflation line in fluid communication with a suction pump
Adjusting desufflation suction based on insufflation-line and desufflation-line pressure measurements
the controller controls ventilation of a gas present in a patient by adjusting an amount of suction in the desufflation line as a function of a pressure measurements obtained from the pressure sensor associated with the insufflation line and a pressure measurement obtained from the pressure sensor associated with the desufflation line
Abdominal pressure estimation via mathematical observer model and identity-based suction activation
the controller activates the suction, and estimates an abdominal pressure of the patient using the pressure sensor of the desufflation line by means of a mathematical observer model and compares the estimated abdominal pressure to the pressure measurement of the pressure sensor in the insufflation line, wherein the suction remains activated only with identical values, effectively a difference smaller than 2 mmHg, between the estimated abdominal pressure and the pressure measurement of the pressure sensor in the insufflation line
Activation blocking based on preset insufflation-line pressure threshold
the controller includes an activation blocking system that prevents the suction in the desufflation line when the pressure measurement by means of the pressure sensor associated with the insufflation line is lower than a preset threshold value
Activation blocking based on non-identical insufflation-line and desufflation-line pressures
the activation blocking system further prevents the suction in the desufflation line when the pressure measurement of the pressure sensor associated with the insufflation line and the pressure measurement of the pressure sensor associated with the desufflation line have values which are not identical
Across the independent claim, the inventive combination is a medical device that controls desufflation suction using both insufflation-line and desufflation-line pressure measurements, estimates abdominal pressure with a mathematical observer model, and keeps suction activated only when estimated abdominal pressure matches the insufflation-line pressure within an effectively identical criterion (difference smaller than 2 mmHg), while also blocking suction using a preset threshold and a pressure identity requirement between the two lines.
Stated Advantages
Provides activation blocking that prevents suction in the desufflation line when insufflation-line pressure is lower than a preset threshold value
Provides further activation blocking that prevents suction when insufflation-line and desufflation-line pressures are not identical (pressure mismatch)
Documented Applications
Controlled ventilation of a gas present in a patient using an insufflator with insufflation and desufflation lines for patient ventilation after surgery is described in the document context.
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