An Organ Perfusion Stent as an Alternative to Surgery in Donor Organ Recovery

器官灌注支架作为供体器官恢复手术的替代方案

• 批准号: 9770857
• 负责人: Young Jae Chun
• 金额: $ 34.4万
• 依托单位: UNIVERSITY OF PITTSBURGH AT PITTSBURGH
• 依托单位国家: 美国
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-15 至 2020-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9770857
• 关键词: 3-Dimensional; 3D Print; Abdomen; Address; Anatomy; Angiography; Arteries; Biopsy; Blood; Blood Circulation; Blood Pressure; Blood Vessels; Blood flow; Cadaver; Cardiac; Cardiac Death; Cardiopulmonary; Catheters; Clinical; Consent; Control Animal; Critical Illness; Custom; Devices; Dialysis procedure; Engineering; Ensure; Ethics; Evaluation; Excision; Family; Family suidae; Fluoroscopy; Gold; Healthcare Systems; Heart; Histologic; Human; Hybrids; Imaging Device; In Vitro; Injury; Intervention; Intubation; Investigation; Laboratories; Life; Liquid substance; Liver; Logistics; Mechanics; Modeling; Monitor; Needlestick Injuries; Operative Surgical Procedures; Organ; Organ Donor; Organ Model; Organ Transplantation; Outcome; Pancreas; Patients; Pattern; Performance; Perfusion; Physiology; Pilot Projects; Polytetrafluoroethylene; Positioning Attribute; Postoperative Period; Prevention; Property; Recovery; Reperfusion Injury; Reporting; Research; Retrieval; Roentgen Rays; Solid; Source; Stents; Structure; Techniques; Time; Transplantation; Transplantation Surgery; United States; Vascular Endothelium; Visceral; base; blood perfusion; cost; design; design and construction; end of life care; heart function; hemodynamics; improved; in vivo; innovation; kidney biopsy; mechanical properties; miniaturize; novel; organ ethics; portability; prevent; prototype; radio frequency; scaffold

PROJECT SUMMARY In the United States, there is a critical shortage of organs for transplant, with only a quarter of the 120,000 patients in need of an organ actually receiving one. The cost of patients awaiting transplant to the healthcare system totals tens of billions of dollars each year. Meanwhile, thousands of organs are discarded each year as a result of injury from inadequate blood flow (ischemic injury) as the donor is dying. The traditional paradigm for consented Donation after Cardiac Death donors has been to discontinue cardiopulmonary life support, leaving organs without adequate blood perfusion until the heart stops. This contrasts with the usual end of life care options for patients who are not donors, in which patients and their families can elect to withhold life support for some body functions (CPR, agents to maintain blood pressure, dialysis, or intubation) while at the same time maintaining life support for other organs. Our proposal details an innovative needlestick approach to maintain selective blood flow to the organs while allowing the donor heart to fail on its own terms. This contrasts to previously reported approaches which would accelerate cardiac death, against ethical principles. We have examined a commercial hybrid prototype Organ Perfusion Stent (OPS) in a pilot study and shown improved blood delivery to organs without a negative impact on cardiac function. Recognizing the logistical challenges of current imaging for device placement in a critically ill patient, such as a donor, we have also developed a portable radiofrequency (RF) approach for stent positioning at bedside. The primary objective of the current approach is to demonstrate that a novel custom made OPS provides objective protection against ischemic organ injury. Our investigation will begin with optimizing the mechanical properties of this novel dual-chambered stent to ensure rapid deployment, successful isolation of the visceral arteries, and simplified retrieval. Next, we will optimize the hemodynamics of the stent to ensure uniform blood flow to the organs. A miniaturized RF antenna will then be directly printed onto the stent structure. In a porcine model of the organ donor, an OPS will be deployed by a needlestick access while under close cardiac monitoring. Positioning approaches using both portable X-ray and RF tag approaches will be compared to gold standard angiography for device positioning. Following a 60 minute period of simulated malperfusion with interval biopsies, both stented and control animals will be recovered with daily assessment to monitor organ function. At two days postoperatively, liver, pancreas and kidney biopsies will be evaluated for ischemic changes histologically. To investigate this device in a human context, an OPS calibrated for human anatomy will then be evaluated for successful deployment and organ perfusion in a heart beating human cadaver model. In summary, we expect that ultimately, an Organ Perfusion Stent may allow every consented donor to successfully donate organs for transplant while respecting the ethics of organ recovery.

项目总结