Artificial pacemaker
First Claim
1. In an artificial pacemaker including oscillator means providing electrical stimuli to the heart at the oscillator frequency, the improvement comprising, in combination, detector means operable to detect instantaneous variations of the pH of the blood as a function of the effort exerted by the wearer of the pacemaker to provide an electrical output which is a function of the instantaneous pH variation;
- and means connecting said detector means to said oscillator means to control the frequency of said oscillator means as a function of the detected pH of the blood.
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Abstract
The pacemaker comprises an indicating micro-electrode in association with a reference electrode and inserted in the patient'"'"'s body in contact with the blood to measure the pH of the blood. This measuring device is connected, through an impedance adapter, to the input of an amplifier which amplifies the mV output of the measuring device by at least a thousand times, and the output of the amplifier is supplied to the input of a transistorized oscillator generating signals of variable frequency in accordance with its input. The oscillator is connected to a cathode follower to furnish the energy necessary for the impulses for the cardiac stimulation which, as known, are applied to an electrode inserted in the cardiac muscular tissue of the ventricle of the heart. A limiter is connected to the input of the amplifier. The amplifier may be either a direct current amplifier or an alternating current amplifier.
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Citations
16 Claims
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1. In an artificial pacemaker including oscillator means providing electrical stimuli to the heart at the oscillator frequency, the improvement comprising, in combination, detector means operable to detect instantaneous variations of the pH of the blood as a function of the effort exerted by the wearer of the pacemaker to provide an electrical output which is a function of the instantaneous pH variation;
- and means connecting said detector means to said oscillator means to control the frequency of said oscillator means as a function of the detected pH of the blood.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification