System and method for monitoring and controlling intrauterine pressure using a pressure cuff
AssigneeCovidien LP
InventorsJordan A. Whisler, Nikolai D. Begg
Life of this patent
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Abstract
A method of determining a pressure of a body cavity with a controller of a fluid management system includes determining a pressure and a volume of a cuff disposed about a collapsible bag, determining a volume of the collapsible bag based on the pressure and the volume of the cuff, and determining a pressure of the collapsible bag based on the volume of the collapsible bag. The method also includes calculating a fluid flow from the collapsible bag into a body cavity from the collapsible bag and determining a pressure of the body cavity based on the fluid flow.
Claims20
A fluid management system comprising:
- a collapsible bag retaining a fluid and configured to deliver the fluid into a body cavity;
- a cuff configured to apply pressure to the collapsible bag to urge the fluid from the collapsible bag into the body cavity;
- an air pump;
- an air hose interconnecting the air pump with the cuff to enable pumping of air from the air pump into the cuff;
- and
- a controller including a processor and non-transitory computer readable medium storing instructions that, when executed by the processor, cause the controller to:
- monitor a change in pressure of the cuff resulting from the delivery of the fluid from the collapsible bag into the body cavity;
- determine a bag volume change of the collapsible bag based on the change in the pressure of the cuff;
- calculate a fluid flow of the fluid from the collapsible bag into the body cavity based on the bag volume change of the collapsible bag;
- and
- determine a pressure of the body cavity based in part on the fluid flow of the fluid according to:
- PU=PCB=QFRIN+ρgΔH,
- wherein PU is the pressure of the body cavity,
- PCB is a pressure of the collapsible bag,
- QF is the fluid flow from the collapsible bag,
- RIN is a resistance of output from the collapsible bag,
- ρ is a density of the fluid,
- g is gravity, and
- Δh is a height of the collapsible bag.
A fluid management system, comprising:
- a collapsible bag retaining a fluid and configured to deliver the fluid into a body cavity;
- a cuff configured to apply pressure to the collapsible bag to urge the fluid from the collapsible bag into the body cavity;
- a pump configured to inflate the cuff to thereby apply the pressure to the collapsible bag;
- and
- a controller operably coupled to the pump, the controller including a processor and non-transitory computer readable medium storing instructions that, when executed by the processor, cause the controller to:
- obtain a pre-determined target body cavity pressure;
- monitor a change in pressure of the cuff resulting from the delivery of the fluid from the collapsible bag into the body cavity;
- determine a bag volume change of the collapsible bag based on the change in the pressure of the cuff;
- calculate a fluid flow of the fluid from the collapsible bag into the body cavity based on the bag volume change of the collapsible bag;
- determine a pressure of the body cavity based in part on the fluid flow of the fluid;
- and
- control operation of the pump based upon the determined pressure of the body cavity to achieve the pre-determined target body cavity pressure.
Dependencies are inferred from the claim text.