Patent ID: 8634891
Filing Date: 2014-01-21
Classification: A61B

Abstract:
1. A sensor, comprising: a light emitting component comprising a first patient-contacting surface and a first opposing surface; a light detecting component comprising a second patient-contacting surface and a second opposing surface and configured to detect light energy emitted by the light emitting component incident upon the second patient-contacting surface; a backing layer; and a collapsible material positioned between the backing layer and at least one of the first opposing surface or the second opposing surface, wherein the collapsible material, when applied to a tissue, is configured to maintain an expanded configuration under a first pressure below a first threshold, is configured to maintain a partially collapsed configuration under a second pressure above the first threshold and below a second threshold, and is configured to maintain a collapsed configuration under a third pressure above the first threshold and the second threshold, wherein the first threshold is in a range of 10 mmHg to 35 mmHg, and wherein the second threshold is at least 80 mmHg.