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Item type:Publication, Access status: without files , A Stent Graft Occlusion Detection : Pressure Sensing Implant Device with Inductive Power and Data Telemetry(IEEE, 2018-04-26); ; ; ; Transjugular intrahepatic portosystemic shunt (TIPS) procedure has been used for the treatment of portal hypertension induced due to liver cirrhosis. A small metallic tube called stent graft is inserted during TIPS for rerouting blood flow in the liver. Common complications after TIPS is partial or complete blockage inside or at either ends of the stent graft. This paper presents the design and fabrication of a smart stent graft containing two pressure sensors for detecting blockages occuring after TIPS. The active implant device with pressure sensor is powered wirelessly and it transmits measured pressure data wirelessly to the external monitoring station using inductive coupling. Ferrite inductor antennas are used for wireless power reception and PCB trace antenna is used for wireless data transmission in the implant device. A smart stent graft is fabricated by coating PTFE membrane on the bare stent followed by mounting of the implant devices. The in vivo setup is emulated by placing the smart stent graft inside meat and powering the implant device with wireless inductive telemetry link. Test result shows that implant device can be operated for a wireless range of 4.5 cm using 15 W 2.05 MHz RF power sender.Publicationtype: Conference Paper177 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Telemetric system for monitoring of endoleak in abdominal aorta aneurysm using multiple pressure sensors integrated on a stent graftAn abdominal aortic aneurysm (AAA) is the dilation of the abdominal aorta due to weakening of the arterial wall. Endovascular aneurysm repair (EVAR) using an implantable stent graft is the commonly used method for treatment of AAA. An endoleak, which is the leakage of blood around the stent graft, is the complication after EVAR creating trauma to the weakened arterial walls of the aneurysm leading to further enlargement and risk of rupture. This paper details the design, implementation and testing of a wirelessly powered implant device containing multiple pressure sensors to be mounted on a stent graft for detecting endoleak. The tested implant device can be powered for distance of 20 cm using an external RF power source of 2.65 W. A stent prototype with sixteen pressure sensors is fabricated and tested using an in-vitro chamber. The resolution and directionality of the pressure sensors in the stent prototype are measured. Different wire bonding glob top encapsulations are evaluated for mechanical stress induced during stent delivery.Publicationtype: Conference Paper101