PUMPING DEVICES, SYSTEMS INCLUDING MULTIPLE PISTONS AND METHODS FOR USE WITH MEDICAL FLUIDS
First Claim
1. A system for delivery of a medical fluid to a patient comprising:
- a pump system comprising;
a plurality of at least three chambers, each of the plurality of chambers comprising an inlet through which fluid is drawn into the chamber and an outlet from which fluid is expelled from the chamber;
a common outlet channel in fluid communication with the outlet of each of the plurality of chambers; and
a plurality of at least three pistons, each of which is slidably disposed within a respective one of the plurality of chambers; and
a drive system comprising;
a cam shaft comprising a plurality of at least three cam lobes, each of the plurality of cam lobes having a profile; and
a plurality of at least three cam lobe followers, each of which is in operative connection with a respective one of the plurality of cam lobes and is adapted to be placed in operative connection with a respective one of the plurality of pistons;
wherein the profile of each of the plurality of cam lobes being adapted to provide a positive spike in calculated theoretical output of the pump system to reduce periodic variation in measured output thereof.
3 Assignments
0 Petitions
Accused Products
Abstract
In one aspect, a system for delivery of a medical fluid to a patient includes a pump system including a plurality of at least three chambers. Each of the plurality of chambers includes an inlet through which fluid is drawn into the chamber and an outlet from which fluid is expelled from the chamber. The pump system further includes a common outlet channel in fluid communication with the outlet of each of the plurality of chambers and a plurality of at least three pistons. Each of the pistons is slidably disposed within a respective one of the plurality of chambers. The system further includes a drive system including a cam shaft including a plurality of at least three cam lobes. Each of the plurality of cam lobes has a profile. The drive system further includes a plurality of at least three cam lobe followers. Each of the cam lobe followers is in operative connection with a respective one of the plurality of cam lobes and is adapted to be placed in operative connection with a respective one of the plurality of pistons. The profile of each of the plurality of cam lobes is adapted to provide a transient increase or spike in calculated theoretical output of the pump system to reduce periodic variation in measured output thereof.
26 Citations
19 Claims
-
1. A system for delivery of a medical fluid to a patient comprising:
-
a pump system comprising; a plurality of at least three chambers, each of the plurality of chambers comprising an inlet through which fluid is drawn into the chamber and an outlet from which fluid is expelled from the chamber; a common outlet channel in fluid communication with the outlet of each of the plurality of chambers; and a plurality of at least three pistons, each of which is slidably disposed within a respective one of the plurality of chambers; and a drive system comprising; a cam shaft comprising a plurality of at least three cam lobes, each of the plurality of cam lobes having a profile; and a plurality of at least three cam lobe followers, each of which is in operative connection with a respective one of the plurality of cam lobes and is adapted to be placed in operative connection with a respective one of the plurality of pistons; wherein the profile of each of the plurality of cam lobes being adapted to provide a positive spike in calculated theoretical output of the pump system to reduce periodic variation in measured output thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A system for delivery of a medical fluid to a patient comprising:
-
a pump system comprising a plurality of at least three chambers, each of the plurality of chambers comprising a piston slidably disposed therein, each of the chambers comprising an inlet through which fluid is drawn into the chamber and an outlet from which fluid is expelled from the chamber, the outlet of each of the plurality of chambers being in fluid connection with a common outlet channel, a cam shaft comprising a plurality of at least three cam lobes, each of the plurality of pistons being in operative connection with one of the plurality of cam lobes via one of a plurality of at east three cam lobe followers; and a fluid intake system in fluid connection with the inlets of the plurality of chambers, the fluid intake system comprising at least two fluid inlet ports and a control system to adjust the volumetric ratio of fluid delivered from the fluid inlet ports. - View Dependent Claims (14, 15, 16)
-
- 17. A fluid mixing system comprising an extending channel, at least two fluid inlet ports in fluid connection with the extending channel, the at least two fluid inlets ports being positioned at different positions along the extending channel, at least one outlet port in fluid connection with the extending channel positioned between the two fluid inlet ports, and a sealing member in sealing engagement with the channel, the sealing member being movable within the channel to adjust the volumetric ratio of the two fluids.
Specification