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US 6,123,073 AGranted
Switch overlay in a piston ventilator
AssigneeNellcor Puritan Bennett LLC
InventorsCraig Schlawin, David B. Lura
Life of this patent
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Abstract
A patient ventilator is connected with two stand-by switches wherein activation of both switches is required for stopping the ventilating function. The preferred stand-by switches are in the form of membrane switches in which a conductive dome is positioned and spaced between respective layers having electrical traces thereon cooperating with the dome for defining the switches. The application of manual pressure closes the spaces between the layers and activates both switches.
Claims18
In combination:
- a respiratory ventilator for ventilating a patient;
- and
- a membrane switch assembly having first and second membrane switches coupled with said ventilator for stopping said ventilator only upon activation of both of said switches,
- said assembly including non-conductive first and second membrane layers with an intermediate membrane layer therebetween,
- said intermediate layer comprising a resilient conductive dome,
- each of said layers being spaced and each of said first and second layers including a circuit trace thereon cooperatively defining said switches positioned in superposed relationship for activation of both of said switches in response to a single application of pressure closing the spaces between said layers.
3 more elements
A membrane switch apparatus comprising:
- a non-conductive first membrane layer;
- a non-conductive second membrane layer;
- and
- a intermediate membrane layer between said first and second layers,
- said intermediate layer comprising a resilient, conductive dome,
- all of said layers being spaced and each of said first and second layers including a circuit trace thereon cooperatively defining first and second switches positioned in superposed relationship for activation of both of said switches in response to a single application of pressure closing the spaces between said layers.
3 more elements
Dependencies are inferred from the claim text.