US 11,964,129 B2
Implantable continuous-flow pumps
Jason Shih, Yorba Linda, CA (US); Gregory Harbers, Montrose, CA (US); Richard Purvis, Pasadena, CA (US); Miho Matsuoka, Rosemead, CA (US); Andrew Urazaki, Las Vegas, NV (US); Mark Humayun, Glendale, CA (US); William Andrew Brandt, Castaic, CA (US); Atoosa Lotfi, Valencia, CA (US); Didier Sagan, San Diego, CA (US); and Andrew Dunn, Santa Monica, CA (US)
Assigned to MiniPumps LLC, Pasadena, CA (US)
Filed by MiniPumps LLC, Pasadena, CA (US)
Filed on Mar. 1, 2019, as Appl. No. 16/290,501.
Claims priority of provisional application 62/637,007, filed on Mar. 1, 2018.
Prior Publication US 2019/0269850 A1, Sep. 5, 2019
Int. Cl. A61M 5/142 (2006.01); A61F 9/00 (2006.01); A61M 5/14 (2006.01); A61M 5/148 (2006.01); A61M 5/155 (2006.01); A61M 5/168 (2006.01); A61M 5/172 (2006.01); A61M 5/145 (2006.01); A61M 39/02 (2006.01); A61M 39/24 (2006.01)
CPC A61M 5/14276 (2013.01) [A61F 9/0017 (2013.01); A61F 9/0026 (2013.01); A61M 5/141 (2013.01); A61M 5/1483 (2013.01); A61M 5/1486 (2013.01); A61M 5/155 (2013.01); A61M 5/16881 (2013.01); A61M 5/172 (2013.01); A61M 5/14593 (2013.01); A61M 39/0208 (2013.01); A61M 2039/242 (2013.01); A61M 2205/04 (2013.01); A61M 2205/75 (2013.01); A61M 2205/7518 (2013.01); A61M 2205/7527 (2013.01); A61M 2205/7545 (2013.01); A61M 2210/0612 (2013.01)] 23 Claims
OG exemplary drawing
 
1. An implantable pump comprising:
a rigid housing;
within the rigid housing, a drug reservoir having a first expandable membrane and a second expandable membrane affixed to an equatorial rib, the first and second expandable membranes defining a drug chamber between the first and second expandable membranes for containing a liquid medicament, the equatorial rib including a portion extending radially inward between the first and second expandable membranes and having beveled interior surfaces, the equatorial rib and the first and second expandable membranes being configured such that the first and second expandable membranes contact the beveled interior surfaces when the drug chamber is depleted, or being depleted, of the liquid medicament, but do not contact the beveled interior surfaces when the drug chamber is filled with the liquid medicament;
a propellant chamber occupying an interior space of the rigid housing, the propellant chamber containing the drug reservoir and a propellant therein, the propellant exerting a substantially constant pressure on the drug reservoir;
a cannula in fluid communication with the drug reservoir; and
a flow restrictor between the drug reservoir and the cannula.