A method for end-reflection reduction of an optical shape-sensing fiber is described. The includes: providing a tip portion having a length dimension (d); connecting the tip portion to an end portion of an optical fiber configured for optical shape-sensing, the tip portion being indexed matched to the optical fiber; and adjusting the absorption properties of the tip portion using back reflections as feedback to provide an absorption length for light traveling in the optical fiber to reduce the back reflections.

A reflection reduction device includes an optical fiber (104) configured for optical sensing and having an end portion. A tip portion (102) is coupled to the end portion. The tip portion includes a length dimension (d) and is index matched to the optical fiber. The tip portion is further configured to include an absorption length to absorb and scatter light within the length dimension, and a surface (S) opposite the end portion is configured to reduce back reflections.

A joint distraction device includes a lever body, a foot extending from a bottom surface of the lever body, wherein the foot is coupled to the lever body via a hinge such that the lever body is rotatable relative to the foot, a first plate and a second plate extending from a distal portion of the lever body, wherein the first plate and the second plate are separated by a gap and wherein each of the first plate and the second plate comprise a stopper extending upwards from a top surface of the first plate and the second plate, and a force measurement device coupled to the bottom surface of the lever body and configured to measure a distraction force applied by the lever body at the foot during a joint distraction procedure in which a torque is applied at a proximal portion of the lever body.

A respiration monitor configured as a patching having adhesive on one side to allow adhesive attachment of the patch to a person. The patch includes a transmitter which generates a reference signal that is provided to a signal path. The signal path is configured to receive and conduct a transmitted reference signal such that the signal path has a length that increases when the person inhales and contracts when the person exhales. A receiver is configured to receive a received reference signal from the signal path. A controller is configured to control generation and transmission of the reference signal and processing the transmitted reference signal and the received reference signal to identify changes in the received reference signal due to transmission through the signal path as the signal path expands and contracts. This is done to generate respiration data that reflects respiration characteristics of the person.

An apparatus for determining a shape of a luminal sample including: a catheter including a lens, the catheter disposed within a strain-sensing sheath such that the lens rotates and translates; a structural imaging system optically coupled to the catheter; a strain-sensing system optically coupled to the catheter; and a controller coupled to the strain-sensing system and the structural imaging system. The controller determines: a first position of the catheter relative to the luminal sample at a first location within the strain-sensing sheath; a second position of the catheter relative to the luminal sample at a second location within the strain-sensing sheath; a first strain of the strain-sensing sheath at the first location; a second strain of the strain-sensing sheath at the second location; a local curvature of the luminal sample relative to the catheter; a local curvature of the catheter; and a local curvature of the luminal sample.

Dual sensor system for continuous blood pressure monitoring during transcatheter heart valve therapies (TVT), such as transcatheter aortic valve replacement (TAVR) or transcatheter mitral valve replacement (TMVR), comprises a controller, a support guidewire for TVT containing a first Fabry-Pérot (FP) optical pressure sensor near its distal end, and a pigtail catheter for delivery of contrast medium containing a second FP optical pressure sensor near its distal end. For example, for TAVR, the support guidewire is positioned to place the first optical pressure sensor within the left ventricle (LV) for monitoring LV pressure, the pigtail catheter is positioned in the aorta to place the second optical pressure sensor in the ascending aorta for direct measurement of pressure in the aorta, downstream of the aortic valve, enabling continuous monitoring of blood pressure at both sensor locations during TAVR. The controller may be configured to interface with standard patient monitoring systems.

Systems and methods of state detection of material surfaces of wearable objects using color sensing are provided. A color sensor is used to sense light from material surfaces of wearable objects to obtain color sensing data. State information (e.g., tension, compression, deformation, displacement, level of material wear, etc.) of the material surfaces can be determined based on the obtained color sensing data.

A method for obtaining a vital signal, includes steps of: acquiring cardiac vibration signals of the subject through at least one vibration sensor placed under the back of the supine subject, and acquiring the ECG data of the subject synchronously; performing data validation testing on the ECG data and the cardiac vibration signals to generate a total validation duration of the ECG data and a total validation duration of the cardiac vibration signals; and determining an end of data acquisition based on the total validation duration of the ECG data and the total validation duration of the cardiac vibration signals.

A stress analysis system for performing analysis of a force exerted on a test object is provided, wherein the test object is defined to have a plurality of predetermined areas at different positions thereof. The stress analysis system includes: an analysis module, and at least two stress bearing modules separate from each other, each of which is located at one of the predetermined areas. Each of the stress bearing modules includes a supporting strip component and a feature sensor, wherein the supporting strip component is able to produce a stressed feature in at least one spatial dimension when being subjected to the force, and the feature sensor is able to sense a stress state of the corresponding predetermined area of the test object in at least one spatial dimension, such that the stress analysis system can accurately analyze the stress state of the test object.

A system and method are presented for detecting and measuring pressure within a region of a body lumen or vessel. The pressure sensing system includes a light source for transmitting light through a pathway containing polarization-maintaining fiber optic wires. A distal portion of the polarization-maintaining fiber optic wire, which is engaged to and extends along a guidewire, includes pressure sensing station(s) made up of fiber Bragg gratings (FBG). The light transmitted to and reflected from the FBGs on the two polarization modes of the polarization-maintaining fiber optic wire can be analyzed to provide one or more pressure values.