Surgery – Cardiac augmentation – With condition responsive means
Reexamination Certificate
2002-08-15
2003-09-23
Schaetzle, Kennedy (Department: 3762)
Surgery
Cardiac augmentation
With condition responsive means
C623S003280
Reexamination Certificate
active
06623420
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to heart assist pumps, and, more specifically, to control thereof in cooperation with the natural heart.
One form of heart dysfunction is the inability for the left ventricle to sufficiently pump blood over various levels of patient activity. Heart assist pumps have been undergoing development for many years for supplementing the pumping capability of the dysfunctional heart.
Since the heart is a muscle which pumps blood in periodic pulses in each heartbeat cycle, the heart assist pump must be capable of complementing natural heart flow without adversely affecting natural performance of the heart.
Many forms of heart assist pumps have undergone development, with different advantages and disadvantages. One form of heart assist pump made in small, implantable size is the Left Ventricular Assist Device (LVAD) which is sutured in flow communication between the left ventricle and the aorta. The LVAD operates in parallel flow with the left ventricle for collectively pumping the blood through the aorta for feeding the arterial branch.
The various heart assist pumps undergoing development have various sizes and configurations from large to small and from rotary to reciprocating. And, each of these pumps must be suitably controlled for pumping blood in conjunction with the left ventricle.
Recently, there have been significant advances in the development of heart assist pumps. Second and third generation rotary pumps are smaller and lighter and have demonstrated viability for long-term support. These pumps are being designed to be totally implantable and to enable patients to eventually leave the hospital and resume normal activities. These new generations of rotary pumps cannot rely on the simple passive fill mechanism that provided physiological control for the first generation of pulsatile heart pumps.
Since the left ventricle undergoes a diastolic filling cycle and systolic pumping cycle, the heart assist pump must be suitably controlled in conjunction with the pulsatile pumping of the natural heart.
Accordingly, it is desired to provide an improved heart assist pump and control system for supplementing blood pumping of the natural heart in situ.
BRIEF DESCRIPTION OF THE INVENTION
A blood pump is joined in parallel flow between the left ventricle and aorta of a patient's heart. The pump includes an inlet pressure sensor and cooperating controller for measuring inlet pressure to the pump to control operation thereof. The controller adjusts speed of the pump in a closed loop control using feedback of the measured inlet pressure to conform operation of the pump with the natural cycle of the heart.
REFERENCES:
patent: 4310930 (1982-01-01), Goldowsky
patent: 4516567 (1985-05-01), Veragen
patent: 5352180 (1994-10-01), Candelon et al.
patent: 5385581 (1995-01-01), Bramm et al.
patent: 5888242 (1999-03-01), Antaki et al.
patent: 6048363 (2000-04-01), Nagyszalanczy et al.
patent: 6171253 (2001-01-01), Bullister et al.
patent: 6176822 (2001-01-01), Nix et al.
patent: 6264601 (2001-07-01), Jassawalla et al.
patent: 6310930 (2001-10-01), Peters et al.
patent: 6367333 (2002-04-01), Bullister et al.
patent: WO98/43688 (1998-10-01), None
Bullister et al, “ A Blood Pressure Sensor for Long-Term Implantation,” Artificial Organs, 2001, 25(5): 376-379.
Yuhki et al, “ Detection of Suction and Regurgitation of the Implantable Centrifugal Pump Based on the Motor Current Waveform Analysis and its Application to Optimization of Pump Flow,” 1999, Artificial Organs, 23(6):532-537.
Nakata et al, “ A New Control Method That Estimates the Backflow in a Centrifugal Pump,” 1999, Artificial Organs, 23(6):538-541.
Jarvik et al, “ Belt Worn Control System and Battery for the Percutaneous Model of the Jarvik 2000 Heart,” 1999, Artificial Organs, 23(6):487-489.
Waters et al, “ Motor Feedback Physiological Control for a Continuous Flow Ventricular Assist Device, 1999,” Artificial Organs, 23(6):480-486.
Giridharan et al, “ Modeling and Control of Brushless DC Axial Flow Ventricular Assist Device,” 2002, ASAIO Journal, pp: 272-289.
Bullister Edward Theodore
Reich Sanford
Apex Medical, Inc.
Conte Francis L.
Droesch Kristen
Schaetzle Kennedy
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