Patents Assigned to Peter P. Wiest
  • Device for irrigation of and aspiration from body cavities
    Patent number: 5098387
    Abstract: The present invention pertains to a device for irrigation of and aspiration from body cavities, especially during surgical laparoscopy, comprising a delivery pump and a suction pump and tubing lines, which are connected to these and lead to the body cavity. A device for irrigation of and aspiration from body cavities, which can be operated in a very simple manner and fully meets sterility requirements is provided.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: March 24, 1992
    Assignee: Peter P. Wiest
    Inventors: Peter P. Wiest, Hubert G. Fuchs
  • Pressure measurement device for fluids flowing in lines
    Patent number: 5044203
    Abstract: The invention relates to a pressure measurement device (1) for fluids flowing in lines (5, 6), particularly for the flexible tubing lines of pressure-controlled roller pumps (22) for use in arthroscopy and urethroscopy. A membrane (8,8') is provided such that it is impacted on the inside by the fluid. A first pressure sensor (12) is connected to the outside of the membrane for measurement of fluid pressure. The first pressure sensor is connected to an evaluating electronic unit.A second pressure sensor (13) is connected to the evaluating electronic unit and is assigned to the outer side of membrane (8,8'), so that it is possible to effect a pressure monitoring based on the second pressure measurement, e.g., in the form of a measurement of pressure difference.
    Type: Grant
    Filed: May 30, 1990
    Date of Patent: September 3, 1991
    Assignee: Peter P. Wiest
    Inventors: Peter P. Wiest, Hubert G. Fuchs
  • Procedure for the perfusion of cavities in objects and device for executing the procedure
    Patent number: 4998914
    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 P.sub.IST 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 P.sub.SOLL in body cavity 1 is maintained constant at preset level P.sub.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: March 12, 1991
    Assignee: Peter P. Wiest
    Inventors: Peter P. Wiest, Hubert Fuchs