公开(公告)号：US11147918B2

公开(公告)日：2021-10-19

申请号：US16168358

申请日：2018-10-23

Applicant: Medtronic, Inc.

Inventor： Steven Christenson ,  Touby Drew ,  James M. Haase ,  Scott A. Sarkinen

IPC: A61M5/14 ,  A61M5/168 ,  A61M5/162 ,  A61M5/142

Abstract: A medicament delivery system configured to reduce the risk of inadvertently injecting medicament directly into a patient during a refill procedure via an external refilling apparatus. The medicament delivery system may include an implantable medical pump having a refillable medicament reservoir accessible via an access port, wherein the refillable medicament reservoir includes a flexible diaphragm having a nonlinear spring rate configured to create a relative vacuum within a medicament chamber when medicament is expelled from the medicament chamber beyond a predefined threshold, so as to spontaneously draw a quantity of medicament into the medicament chamber during the refill procedure to reestablish the predefined threshold, thereby confirming proper placement of a portion of the external refilling apparatus into the access port.