Patents by Inventor Steven M. Maas

Steven M. Maas has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Reconfirmation prior to shock for implantable defibrillation
    Patent number: 5191884
    Abstract: A multiprogrammable, telemetric, implantable defibrillator contains a high energy shock system to revert VT/VF's to normal sinus rhythm and a multi-programmable VVI bradycardia support system. When the apparatus is in an automatic shock sequence, there are two points of reconfirmation: at the programmed minimum time to shock and after the full charge has been reached, or at thirty seconds, whichever comes first. Reconfirmation involves testing the tachycardia detection output (TDO). If the TDO is high, reconfirmation occurs. If the TDO is low, reconfirmation will not occur and the device will subsequently dump the discharge. Two reconfirmations must occur before a shock is delivered to the patient. If the TDO is low at either reconfirmation, the charge will be dumped.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: March 9, 1993
    Assignee: Telectronics N.V.
    Inventors: Norma L. Gilli, Lorraine Holley, Geoffrey A. Drane, Anthony C. Stephens, Christopher N. Daly, Steven M. Maas
  • Method and apparatus for chronically monitoring the hemodynamic state of a patient using doppler ultrasound
    Patent number: 5188106
    Abstract: A hemodynamic control apparatus and method for regulating blood flow within the cardiovascular system in a closed-loop control system using ultrasound measurement techniques to determine a hemodynamic status of the patient and to derive a control parameter for modulating the hemodynamics of the system using electrical or pharmaceutical therapy. This apparatus and method provides for the monitoring of heart contractility and blood flow output from the heart to control an implantable cardiac assist or therapy device to maintain cardiac output without invading the left heart or the arterial system of the patient.
    Type: Grant
    Filed: March 8, 1991
    Date of Patent: February 23, 1993
    Assignee: Telectronics Pacing Systems, Inc.
    Inventors: Tibor A. Nappholz, Harry L. Valenta, Jr., Steven M. Maas, Ken Koestner
  • Method and apparatus for controlling the hemodynamic state of a patient based on systolic time interval measurements detecting using doppler ultrasound techniques
    Patent number: 5139020
    Abstract: A hemodynamic control apparatus and method for regulating blood flow within the cardiovascular system in a closed-loop control system using ultrasound measurement techniques and intracardiac electrogram sensing to determine a hemodynamic status of the patient and to derive a control parameter for modulating the hemodynamics of the system using electrical or pharmaceutical therapy. This apparatus and method provides for the monitoring of heart contractility and blood flow volume in the circulatory system to control an implantable cardiac assist or therapy device to maintain the hemodynamic status of the patient without invading the left heart or the arterial system of the patient.
    Type: Grant
    Filed: March 8, 1991
    Date of Patent: August 18, 1992
    Assignee: Telectronics Pacing Systems, Inc.
    Inventors: Ken Koestner, Tibor A. Nappholz, Harry L. Valenta, Jr., Steven M. Maas