Disposable positive displacement dosing system

摘要

A positive displacement dosing system and method of dispensing a fluid including a plurality of disposable positive displacement pumps. The disposable positive displacement pumps each include a pump body having head portion and a base portion, with the head portion having one or more fluid passage openings. Each disposable positive displacement pump also includes a rolling diaphragm internal to the pump body and defining a fluid chamber within the pump body. The disposable positive displacement pump also includes a piston drive unit configured to reciprocally drive the rolling diaphragm to move fluid in or out of the fluid chamber. The positive displacement dosing system includes tubing connecting the fluid reservoir to the disposable positive displacement pump.

主权项

1. A disposable positive displacement dosing system comprising:
a plurality of positive displacement pumps; each pump comprising:
a pump housing having a pump head portion non-disengagingly connected to a body, the pump head portion having a plurality of fluid passage openings and the body having a plurality of separate concentrically positioned components, a pneumatic chamber and a pneumatic port;a rolling diaphragm internal to the pump housing and separating a fluid chamber from the pneumatic chamber; anda piston drive unit having a piston formed from a plastic material and a piston head portion, the piston drive unit at least partially retained by the pump housing 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 the piston head portion of the piston drive unit is sized to cooperate with the body to limit reciprocal movement of the piston drive unit, and wherein at least a first seal and a second seal are spaced apart and positioned between the piston and the plurality of seperate 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 seperate concentrically positioned components of the body, and the second seal is positioned between the piston and a second component of the plurality of seperate 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; andtubing connecting to the plurality of positive displacement pumps.