Abstract: A method for detecting a stenosis in a prosthesis includes providing a tubular prosthesis having a sensor coupled to the prosthesis and implanting the tubular prosthesis in a native fluid conduit. The sensor senses the stenosis and captures data that characterizes the stenosis. A spectral analysis of the data may then be performed in order to provide a frequency spectrum of the data. The frequency spectrum may be examined in order to identify a break frequency value in the frequency spectrum. The break frequency may then be translated into a percentage of stenosis in the tubular prosthesis.

Abstract: A prosthesis for monitoring a characteristic of flow includes a first tubular prosthesis having a lumen and a sensor for detecting the characteristic of flow through the lumen. The sensor may be covered with another tubular prosthesis or by a layer of material in order to insulate the sensor from the fluid flow. A pocket may be formed between the tubular prosthesis and the adjacent layer of material or prosthesis and the sensor may be disposed in the pocket.

Abstract: A method for assessing fluid flow in a conduit includes sensing the fluid flow with a sensor and generating data from the sensor that relates to the sensed fluid flow. The data is output from the sensor and filtered so that it may be interpreted to characterize the fluid flow. The conduit may be a prosthesis such as stent, a stent-graft or a prosthetic vascular graft and the flow may be any body fluid such as blood, bile, or cerebrospinal fluid.

Abstract: A prosthesis for monitoring a characteristic of flow includes a first tubular prosthesis having a lumen and a sensor for detecting the characteristic of flow through the lumen. The sensor may be covered with another tubular prosthesis or by a layer of material in order to insulate the sensor from the fluid flow. A pocket may be formed between the tubular prosthesis and the adjacent layer of material or prosthesis and the sensor may be disposed in the pocket.

Abstract: A microneedle patch for assessing oxygenation at a localized region of interest includes microneedle projections which extend into a region of interest, a layer of material bonded to the microneedles which allows the patch to releasably engage the localized region of interest, and a paramagenetic material dispersed within the patch. An oxygen impermeable layer of material may be disposed over the oxygen permeable layer of material such that environmental oxygen is inhibited from interacting with the paramagnetic material.

Abstract: A scanner for assessing localized oxygenation of a desired region of interest includes a handheld housing having a proximal end and a distal end. A resonator coil is disposed within the housing and also disposed adjacent the distal end of the housing. The resonator coil is configured to both excite and read paramagnetic materials. A magnet is disposed within the housing and also disposed adjacent the distal end of the housing. The magnet is configured to provide a substantially uniform magnetic field over the desired region of interest. The scanner is configured to use electron paramagnetic resonance to assess localized oxygenation in the desired region.