Sensor position on a prosthesis for detection of a stenosis
Inventors
Kuraguntla, David John • Gupta, Samit Kumar • Rushenberg, Robert Lawrence
Assignees
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Publication Number
US-9924905-B2
Publication Date
2018-03-27
Expiration Date
Abstract
A prosthesis for monitoring a stenosis in the prosthesis comprises a tubular prosthesis having a proximal portion, a distal portion, and a lumen extending therebetween. A sensor is coupled to the tubular prosthesis and disposed at an effective predetermined location on the tubular prosthesis so that the sensor may sense a presence of the stenosis in the lumen.
Core Innovation
The invention provides implantable tubular prostheses for monitoring a stenosis therein. The prosthesis includes a proximal portion, a distal portion, and a lumen extending therebetween, and a sensor coupled to the tubular prosthesis. The sensor is disposed at an effective predetermined location on the tubular prosthesis and forms a loop around the tubular prosthesis for circumferentially sensing a presence of the stenosis in the lumen.
The circumferential looped sensor is positioned to sense stenosis within effective distance constraints relative to the stenosis and anastomotic sites. The sensor implementation includes an acoustic sensor, such as a PVDF piezoelectric film sensor, and loop orientation and coverage patterns including circumferential loop orientation and partial-loop coverage. The disclosure further provides examples of a single sensor or a plurality of sensors positioned along the tubular prosthesis with predetermined spacing and coverage along the prosthesis length.
A monitoring system is described in which sensing of the stenosis is used to report out data regarding a condition of the stenosis, with signal processing and communication to an external reader and transmission of sensor data. Experimental findings are described using PVDF-sensor graft and stent phantoms, indicating effective acoustic detection at proximally located and distally located occlusions relative to the sensor, and emphasizing detection performance when the sensor placement is within specified proximity to distal and proximal anastomosis in bypass scenarios.
Claims Coverage
The document contains two independent claims directed to a prosthesis structure for monitoring stenosis and a method for monitoring stenosis using that prosthesis. The main inventive features across the independent claims include an implantable tubular prosthesis with a circumferential looped sensor disposed at an effective predetermined location, configuration for sensing stenosis in the prosthesis lumen, and method steps that sense stenosis circumferentially and report out data regarding the stenosis condition.
Circumferential looped sensor at an effective predetermined location for stenosis sensing
A tubular prosthesis having a proximal portion, a distal portion, and a lumen extending therebetween; and a sensor coupled to the tubular prosthesis and disposed at an effective predetermined location, wherein the sensor is disposed circumferentially around the tubular prosthesis and forms a loop around the tubular prosthesis; wherein the sensor is configured to sense a presence of the stenosis in the lumen.
Circumferential sensing of stenosis in a tubular prosthesis with reporting
Providing a tubular prosthesis having a sensor coupled thereto; implanting the tubular prosthesis in a native fluid conduit; sensing a stenosis in a lumen of the tubular prosthesis with the sensor; and reporting out data from the sensor regarding a condition of the stenosis, wherein sensing comprises circumferentially sensing the stenosis with the sensor, wherein the sensor is circumferentially disposed around the tubular prosthesis.
Across the independent claims, the core coverage is the combination of an implantable tubular prosthesis and a sensor that circumferentially loops around the prosthesis at an effective predetermined location to sense stenosis in the lumen, together with a method that uses the same sensor arrangement and reports out sensor data describing the stenosis condition.
Stated Advantages
Effective acoustic detection performance is described for occlusions at proximally and distally located positions relative to the sensor, and in bypass scenarios when sensor placement is within specified proximity to distal and proximal anastomosis.
Documented Applications
Monitoring a stenosis in an implantable vascular prosthesis, including grafts, stents, and stent-grafts coupled to a native fluid conduit such as a blood vessel, with sensing centered on stenosis surveillance via sensor position.
Monitoring in other conduit applications is described, including urinary/cerebrospinal shunts.
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