Surgery – Truss – Perineal
Patent
1975-06-19
1976-11-16
Kamm, William E.
Surgery
Truss
Perineal
A61B 504
Patent
active
039917487
ABSTRACT:
A circuit arrangement for the processing of physiological measuring signals, including a plurality of input amplifiers having branch signal electrodes connected thereto and to which there are subsequently connected differential amplifiers, each of the latter being connected to the outputs of at least two input amplifiers by means of a program selector and pursuant to a preselected program, and in which it becomes possible to effect a screening or testing of the various circuit elements and, thereby, also of the input amplifiers. A manually controllable calibrating impulse generator is connected to the inputs of all input amplifiers so as to increase the input voltages of the input amplifiers, each differential amplifier including an additional calibrating input to which there is transmissible a calibrating signal from the calibrating impulse generator and wherein, in each differential amplifier, the signal at the calibrating input is superimposed on the differential signal.
REFERENCES:
patent: 2684278 (1954-07-01), Marchand
patent: 3709212 (1973-01-01), Koeblitz
patent: 3868948 (1975-03-01), Graetz
patent: 3882846 (1975-05-01), Fletcher
Duffin, Jr. et al., "Proceedings of the 23rd Annual Conference on Engineering in Medicine & Biology," Wash., D.C. Nov. 16-19, 1970, p. 193.
Kamm William E.
Siemens Aktiengesellschaft
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