【発明の名称】埋め込み可能な容量式圧力および温度センサ

Japanese Patent JP3149957

B2

An endocardial lead for implantation in a right heart chamber for responding to blood pressure and temperature and providing modulated pressure and temperature related signals to an implanted or external hemodynamic monitor and/or cardiac pacemaker or pacemaker/cardioverter/defibrillator. The lead has a sensor module formed in its distal end and is coupled to a monitor that powers a sensor circuit in the sensor module. The sensor module is formed with a pickoff capacitor that changes capacitance with pressure changes and a reference capacitor that is relatively insensitive to pressure changes. The sensor circuit provides charge current that changes with temperature variation at the implant site, alternately charges and discharges the two capacitors, and provides timing pulses having distinguishable parameters at the end of each charge cycle that are transmitted to the demodulator. The demodulator detects and synchronizes the timing pulses and derives pressure and temperature analog voltage values representative of the intervals between the timing pulses which are digitized and stored in the monitor. The monitor may also be coupled with other sensors for measuring and storing related patient body parameters, e.g. blood gas, EGM, and patient activity.

Halperin, Luis Yee
Miesel, Case Ay
Keith Afford
Svensk, James Earl
Patrick, Timothy
Hustler, Beth Ann H
Verlicho, Anthony Jay

JP52625296A

March 26, 2001

January 24, 1996

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Medtronic Incorporated

G01L9/12; A61B5/00; A61N1/365; G01K5/32; (IPC1-7): A61N1/365; G01K5/32; G01L9/12

【文献】米国特許5381299(US,A)
【文献】米国特許5324326(US,A)
【文献】米国特許5127404(US,A)
【文献】米国特許4967755(US,A)
【文献】米国特許4858615(US,A)
【文献】米国特許4815472(US,A)
【文献】米国特許4750495(US,A)
【文献】米国特許4556063(US,A)

Kazuo Shamoto (4 outside)

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