Procedure for the perfusion of cavities in objects and device for executing the procedure
First Claim
1. A method for the perfusion of body cavities with fluid supplied from a dispenser reservoir via a perfusion line and a medical instrument by a pump including a pressure sensor connected between the pump and the medical instrument and a control unit connected to the pressure sensor and connected to the pump, comprising the steps of:
- determining the conductance of the fluid line between the pressure sensor and the medical instrument and determining the conductance of the medical instrument to provide the overall conductance G;
connecting the medical instrument to the body cavity of a patient;
initiating perfusion of fluid via the perfusion line and medical instrument;
determining the pressure PGEM sensed by the pressure sensor;
determining the volumetric rate of flow V;
determining the actual fluid pressure in the body cavity PIST based on the pressure PGEM sensed, the volumetric rate of flow V and the overall conductance G; and
attaining and maintaining the actual pressure PIST equal to a preset value of the volumetric rate of flow V through continuous adjustment of the volumetric rate of flow V based on the overall conductance G.
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Accused Products
Abstract
The invention relates to a procedure for the perfusion of body cavities with a fluid led from a dispenser reservoir 3 via a perfusion line 10 and a medical instrument 6. Pump 4 is connected with the perfusion line 10, a pressure sensor 5 is connected between pump 4 and medical instrument 6 to perfusion line 10, and an adjustment and measurement electronic system 12 is connected to pressure sensor 5 and pump 4.
To build up, maintain, and measure as precisely as possible a preselected and precisely determined pressure in the body cavity, according to the invention the adjustment and measurement electronic system 12 determines the actual pressure in body cavity 1 by evaluating the pressure PIST measured by pressure sensor 5, the volume flow V supplied by pump 4, and the conductance G of the perfusion line 9 between pressure sensor 5 and instrument 6 and conductance G of instrument 6, and the pressure PSOLL in body cavity 1 is maintained constant at preset level PSOLL by continuous adjustment of the output of pump 4 with due consideration for conductance G.
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Citations
12 Claims
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1. A method for the perfusion of body cavities with fluid supplied from a dispenser reservoir via a perfusion line and a medical instrument by a pump including a pressure sensor connected between the pump and the medical instrument and a control unit connected to the pressure sensor and connected to the pump, comprising the steps of:
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determining the conductance of the fluid line between the pressure sensor and the medical instrument and determining the conductance of the medical instrument to provide the overall conductance G; connecting the medical instrument to the body cavity of a patient; initiating perfusion of fluid via the perfusion line and medical instrument; determining the pressure PGEM sensed by the pressure sensor; determining the volumetric rate of flow V; determining the actual fluid pressure in the body cavity PIST based on the pressure PGEM sensed, the volumetric rate of flow V and the overall conductance G; and attaining and maintaining the actual pressure PIST equal to a preset value of the volumetric rate of flow V through continuous adjustment of the volumetric rate of flow V based on the overall conductance G. - View Dependent Claims (2, 3)
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4. An apparatus for the perfusion of body cavities with a fluid, comprising:
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a dispenser reservoir; a perfusion line connected to said reservoir; a medical instrument connected to said perfusion line at an opposite end from said dispenser reservoir; pump means connected to said perfusion line; a pressure sensor connected to said perfusion line between said pump means and said medical instrument; and control means, connected to said pump means and connected to said pressure sensor for determining the pressure PGEM sensed by the pressure sensor, for determining the volumetric flow of the fluid V, or determining the conductance of the fluid line between the pressure sensor and the medical instrument and determining the conductance of the medical instrument to determine an overall conductance value G, for determining the actual fluid pressure in the body cavity PIST based on the pressure sensed PGEM, the volumetric rate of flow V and the overall conductance G and for maintaining the pressure PIST equal to a present value PSOLL through continuous adjustment of the volumetric rate of flow V of the pump based on the conductance G. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification