Surgery – Truss – Pad
Patent
1992-12-11
1994-02-22
Sykes, Angela D.
Surgery
Truss
Pad
356 41, 439606, A61B 500
Patent
active
052878538
ABSTRACT:
An adapter cable is used for connecting a pulsoximetry sensor unit to a medical measuring device. The pulsoximetry sensor unit comprises, among other components, two antiparallel-connected, light-emitting diodes, which are activated alternatingly by a pulse current source of the medical measuring device. Between said pulsoximetry sensor unit and said medical measuring device, a plurality of grounding lines extend within the adapter cable. In the case of a short circuit between one of the two supply lines of the antiparallel-connected, light-emitting elements and one of the grounding lines, the fault current is caused to flow in the grounding lines to a first node in accordance with the present invention, said first node being adapted to be connected to a reference potential of the medical measuring device via a first resistor. The voltage drop across said first resistor will cause firing of a thyristor structure, if a limit value is exceeded, provided that the instantaneous control phase of the pulse current source of the medical measuring device can cause an activation of a predetermined element of the two light-emitting elements. The triggered thyristor circuit will cause an activation of a switch, which will establish a shunt to the light-emitting elements.
REFERENCES:
patent: 4446715 (1984-05-01), Bailey
patent: 4621643 (1986-11-01), New, Jr. et al.
patent: 4684245 (1987-08-01), Goldring
patent: 5113861 (1992-05-01), Rother
patent: 5149503 (1992-09-01), Kohno et al.
Sommer Heinz
Vester Joachim
Hewlett--Packard Company
Sykes Angela D.
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