Surgery – Truss – Pad
Patent
1978-06-09
1980-05-27
Kamm, William E.
Surgery
Truss
Pad
A61B 504
Patent
active
042045460
ABSTRACT:
A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode pair selecting means is included in a portable head box which may be placed adjacent to the patient to be tested. Included in the head box are facilities for testing the impedance of any selected one of the patient electrodes and providing a visual indication of the magnitude of such impedance. The head box also includes facilities for selecting a group of patient electrodes which are connected together and used as an average or reference potential for one input of the common signal path. Facilities are also provided for calibrating the common signal path by applying a d.c. calibration signal to the input thereof by means isolated from system ground. An improved circuit arrangement is provided for limiting the current which can be drawn from the patient ground electrode to a small value to provide for the safety of the patient in the event of malfunctioning of the electrode selecting means. Facilities are provided in the common signal path for removing the d.c. components of the electrode pair signal voltages, and for selectively varying the gain of the common signal path on an individual channel basis.
REFERENCES:
patent: 3374461 (1968-03-01), Anderholm et al.
patent: 3434151 (1969-03-01), Bader et al.
patent: 3721230 (1973-03-01), Ziernicki
patent: 3868948 (1975-03-01), Graetz
patent: 3991747 (1976-11-01), Stanly et al.
patent: 3991748 (1976-11-01), Ohlsson
patent: 4037586 (1977-07-01), Grichnik
Loeb Phillip J.
Smith Leland B.
Beckman Instruments Inc.
Harder Paul R.
Kamm William E.
Kowalski Frank J.
Steinmeyer Robert J.
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