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    INTRAVENOUS LIQUID PUMPING SYSTEM AND METHOD
    243.
    发明专利
    INTRAVENOUS LIQUID PUMPING SYSTEM AND METHOD 未知

    公开(公告)号：CA1110137A

    公开(公告)日：1981-10-06

    申请号：CA278921

    申请日：1977-05-20

    Applicant: VALLEYLAB INC

    Inventor： LUNDQUIST INGEMAR H

    IPC: A61M1/10 ,  A61M1/00 ,  A61M5/142 ,  A61M5/168 ,  A61M39/00 ,  F04B9/04 ,  F04B43/067 ,  F04B49/12 ,  F04B53/10 ,  F04B53/16 ,  A61M5/14

    Abstract: TO ALL WHOM IT MAY CONCERN: BE IT KNOWN that I, INGEMAR H. LUNDQUIST, a citizen of the United States of America, residing in the city of Oakland, County of Alameda, State of California, have invented certain new and useful improvements in INTRAVENOUS LIQUID PUMPING SYSTEM AND METHOD of which the following is the specification. Intravenous Fluid Pumping System having a controller and a pump controlled by the controller. The controller has a sealed chamber with a flexible membrane covering a portion thereof. An incompressible fluid is disposed in the chamber. A piston member is movable in the chamber causing extension and retraction of the membrane as the piston is moved in and out relative to the chamber. A motor is provided for reciprocating the piston. The pump has a pump body with a pumping chamber therein with one portion of the pump body being covered by a flexible membrane in contact with flexible membrane carried by the sealed chamber of the controller. The pump has an inlet adapter connected to the source of fluid. The pump also has an outlet adapted connected to the patient. Inlet and outlet valves are provided in the pump body whereby when the controller is operated to flex the membrane of the sealed chamber of the controller, the diaphragm of the pump is operated to cause movement of the valve members to cause fluid to pass from the source through the pump and to the patient under the control of the pump. The controller is also provided with an alarm system whereby positive and negative pressure conditions in the pumping chamber can be sensed. In the method a piston-like member is used to positively cause displacement of a liquid within a sealed chamber to cause movement of a flexible membrane forming a portion of the sealed chamber. The movement of the flexible membrane causes simultaneous movement of another flexible membrane in intimate contact with the firstnamed flexible membrane. The movement of the second flexible membrane is used to create a pumping action in a pump having a pumping chamber in which the last-named flexible membrane forms a part of the pumping chamber.

    A CONTROL SYSTEM FOR NEUROSURGICAL ELECTROSURGICAL UNIT
    249.
    发明专利
    A CONTROL SYSTEM FOR NEUROSURGICAL ELECTROSURGICAL UNIT 未知

    公开(公告)号：CA2220904C

    公开(公告)日：2001-08-14

    申请号：CA2220904

    申请日：1996-06-03

    Applicant: VALLEYLAB INC

    Inventor： EGGLESTON JEFFREY L ,  SODNICAR MATTHEW J ,  ORSZULAK JAMES H

    IPC: A61B18/12 ,  A61B18/14 ,  A61B17/39

    Abstract: A control system (10) and method for the operation of neurosurgical bipolar electrodes (11) provides a source of high frequency energy (13') connected t o bipolar electrodes (11). Contacting surfaces are on the bipolar electrodes (11) of highly electrically conductive material. A current transducer attach ed to the source of high frequency energy (13') measures (20) the RMS current applied between the contact surfaces (25). A current transducer attached to the source of high frequency energy (13') provides a signal (26) correlated to the instantaneous values of the RMS voltage between the contacts. A control connects to the source of high frequency energy (13') for initially regulati ng the RMS current applied by the contacting surfaces in response to the impedance until the signal (19) divided by the measure (20) which is representative of the instantaneous impedance of the load reaches a predetermined value. The control regulates the RMS power applied by the contacting surfaces in accord with the impedance until the signal (19) divid ed by the measure (20) reaches a predefined value. The control responds to the measure (20) and the signal (19) so that the RMS voltage applied to the load being treated between the contacting surfaces regulated while its impedance is monitored until a prescribed value is reached. The control regulates the RMS voltage applied in accord with the impedance by changing the RMS voltage to a percentage of that applied until the prescribed value is obtained so that th e tissues stay moist and are coagulated without drying and carbonizing or turning to eschar.

    APPARATUS AND METHOD FOR STERILIZATION AND EMBOLIZATION
    250.
    发明专利
    APPARATUS AND METHOD FOR STERILIZATION AND EMBOLIZATION 未知

    公开(公告)号：CA2204566C

    公开(公告)日：2001-07-10

    申请号：CA2204566

    申请日：1997-05-06

    Applicant: VALLEYLAB INC

    Inventor： LAMBRECHT GREGORY H ,  RYAN THOMAS P

    IPC: A61B17/42 ,  A61B18/12 ,  A61B18/14 ,  A61F6/20 ,  A61N7/02 ,  A61B17/36

    Abstract: An apparatus (20) for transcervical sterilization or transcatheter embolizat ion with a controlled bipolar RF catheter (21) for creating thermal lesions (22) in t he fallopian tubes (23) or thrombosing vessels has a catheter (21) elongate along an axis there of with a patient end (24). The catheter (21) is circular and sized for transcervical insertio n into the fallopian tube or transcatheter vessel insertion, respectively. A connector (25) on an end of the catheter (21) opposite the patient end (24) has the terminations (26) for RF and monitoring and is shaped for the surgeon to manipulate during placement and withdrawal. Two or more bipolar electrodes (29, 30 and 31)on the patient end (24) are pl aced so each electrode is spaced from another with each circumscribing the catheter (21). A mucosa or thrombus sensor responsive to applied RF energy passing between the two or m ore bipolar electrodes (29, 30 and 31)determines the condition of the transmural formati on of a lesion or the thrombus between each of the electrodes. The sensor is a temperature sensor positioned in the space (34) between the electrodes measures the change in m ucosal layer temperature or the thrombus during the application of RF energy. An RF gener ator (27) electrically coupled to the electrodes and the sensor is alternately a phase detector(35) in circuit with the coupling determines reactance of tissue as an indicator of lag or lead of the voltage wave form or current wave form delivered or is an impedance responsi ve circuit (39) positioned in the RF generator (27) to determine voltage and current de livered so a calculator finds impedance delivered for finding initial electrode contact w ith the tissue and for measuring the change in mucosal layer. A blunt tip at the patient end (2 4) facilitates introduction into the tube or vessel to avoid perforation. The temperature s ensor connects to an RF generator (27) with control circuitry regulating delivery to a temp erature range. A proportional controller regulates the RF energy delivery to control temper ature rise time and to maintain the temperature near the mid point of the temperature range. A method for sterilization has the steps of inserting a catheter (21), delivering RF and monitoring the effect on the mucosa or thrombus, circumscribing the catheter (21) with two or more bipolar electrodes, each of the electrodes spaced from one another and passi ng RF energy therebetween.

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