Surgery – Truss – Pad
Patent
1994-10-31
1996-05-28
Kamm, William E.
Surgery
Truss
Pad
128634, 128612, 374131, 374161, A61B 502, G01K 1120
Patent
active
055201903
ABSTRACT:
A cardiac blood flow sensor includes a light source and a photodetector within a housing. The light source projects a beam through a fiber optic line having a first end optically connected to the housing and a distal tip positioned within the patient's heart. A ruby positioned at the distal tip is heated by the beam, and fluoresces for a period of time after illumination ceases. The period of time depends on the temperature of the ruby, so that the fluorescent light is transmitted back through the optic line to the photodetector. The signal generated by the photodetector may be analyzed to estimate the blood flow rate, due to the thermal effect of blood flowing past the heated ruby. The flow sensor may be contained in a common housing with a defibrillator that is implanted in a patient. The sensor may remain inactive until a tachycardia or rapid heart rate is detected, upon which the light source is activated. The cardiac condition is analyzed based on the detected heart rate and blood flow and, if needed, an appropriate therapy is delivered.
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Benedict George J.
Fayram Timothy A.
Kamm William E.
Layno Carl H.
Meltzer Mark J.
Mitchell Steven M.
Ventritex, Inc.
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