Patent ID: 9249796
Filing Date: 2016-02-02
CPC Classification: B65B,F04B

Claim Text:
1. A disposable positive displacement pump comprising: a pump housing having a head portion non-disengagingly connected to a body, the head portion having a plurality of fluid passage openings, the body including a plurality of separate concentrically positioned components, a pneumatic chamber and a pneumatic port; a rolling diaphragm internal to the pump housing and defining a fluid chamber within the pump housing; and a piston drive unit at least partially retained within the pump housing by the body, the piston drive unit at least partially formed from plastic and configured to reciprocally drive the rolling diaphragm in an axial direction to move fluid into the fluid chamber via a first of the plurality of fluid passage openings and out of the fluid chamber via a second of the plurality of fluid passage openings, and wherein at least a first seal and a second seal are spaced apart and positioned between a piston and the plurality of separate concentrically positioned components of the body, the first and second seals configured to assist in maintaining a vacuum in the pneumatic chamber; wherein the first seal is positioned between the piston and a first component of the plurality of separate concentrically positioned components of the body, and the second seal is positioned between the piston and a second component of the plurality of separate concentrically positioned components of the body, and wherein the first seal is positioned inward of the pneumatic port in a radial direction, the radial direction perpendicular to the axial direction, and wherein the pump housing, the rolling diaphragm, and the piston drive unit are non-disengageable and fully disposable.