Ambulatory patient infusion apparatus
First Claim
1. Infusion apparatus comprising:
- a control module having motor means;
a cassette adapted for connection to said control module and having solution containing means therein, said cassette having a side thereof configured for matingly slidably engaging a side of said control module for connecting the two parts together as a unit;
a valve assembly within said cassette for controlling flow of solution from said solution containing means;
a piston member within said valve assembly, said piston member having a head protruding from said side of said cassette; and
reciprocable means within said control module protruding from said side thereof and reciprocated by said motor means, said reciprocable means and said head having coacting engaging configurations for enabling releasable attachment with said cassette positioned with its side in abutting relation with said side of said control module with said sides out of alignment, the sliding of one of said cassette and said module relative to the other both interlocking the two parts and engaging said head with said reciprocable means.
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Accused Products
Abstract
A modular ambulatory patient infusion apparatus including a control module and an infusion fluid or solution-containing interlocking cassette. The control module includes thumbwheel presettable electronic circuitry and display means in the form of windows for viewing the preset numerical values. In accordance with these settings, the circuitry drives a motor-operated reciprocable piston actuator terminating in a finger-like flange engaging portion. The motor shaft drives a worm and worm gear arrangement for reciprocating the piston actuator, with each of the worm and worm gear interoperatively associated with light cells for determining both motor speed and worm gear revolution. These, in turn, provide signals to the circuitry to vary the duty cycle of a pulse width modulated motor controller, while providing an indication of a complete revolution of the worm gear (which correlates to one cycle of the piston actuator) and providing an indication of motor speed which is utilized to detect occlusions by motor speed slowdown or stall. A flexible solution bag is retained within the cassette with the discharge tube thereof in fluid communication with a fluid pumping means within a block having a chamber therein and valve arrangement therein. The fluid pump includes a piston communicating with the chamber and having a flanged end configured for coacting engagement with the finger-like flange engaging portion of the piston actuator of the control module. The valve arrangement includes first and second check valves in fluid flow communication with the chamber, the first valve being in flow communication with the tube from the bag and the second valve being in flow communication with a passage leading to an IV tube set for connection to the patient.
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Citations
33 Claims
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1. Infusion apparatus comprising:
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a control module having motor means; a cassette adapted for connection to said control module and having solution containing means therein, said cassette having a side thereof configured for matingly slidably engaging a side of said control module for connecting the two parts together as a unit; a valve assembly within said cassette for controlling flow of solution from said solution containing means; a piston member within said valve assembly, said piston member having a head protruding from said side of said cassette; and reciprocable means within said control module protruding from said side thereof and reciprocated by said motor means, said reciprocable means and said head having coacting engaging configurations for enabling releasable attachment with said cassette positioned with its side in abutting relation with said side of said control module with said sides out of alignment, the sliding of one of said cassette and said module relative to the other both interlocking the two parts and engaging said head with said reciprocable means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Fluid flow control apparatus comprising:
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pump means having a reciprocable piston member in fluid flow communication with the fluid; motor means; means interconnecting said motor means and said piston member for reciprocating the same; means in circuit relation with said motor means for setting desired fluid flow parameters; means for determining the time duration of movement of said piston member in each direction of travel during operation of said motor means when pumping fluid; and means responsive to the time durations thus determined for determining at least one state of said fluid flow parameters and for controlling said motor means in accordance with said desired fluid flow parameters. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. Infusion apparatus comprising:
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a control module having manually operable controls for setting solution discharge parameters, said module having a side with said manually operable controls on said side; a separable cassette having solution containing means therein and a side thereof configured for mating engagement with said side of said control module for connecting the two parts together as a unit, the parts when thus connected together rendering said control means inaccessible; and pumping means, part of which is contained in said control module and part of which is contained in said cassette, said pumping means enabling discharge of solution from said solution containing means in accordance with the setting of said controls, said part of said pumping means within said cassette including a chamber in flow communication with first and second valve means within said cassette, said first valve means enabling flow of solution from said solution containing means into said chamber and said second valve means enabling flow of solution from said chamber to an intravenous tubing set. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. Fluid flow control apparatus comprising:
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a control module; a separable cassette including solution containing means; pump means having a reciprocable piston member in fluid flow communication with the fluid, said reciprocable piston being contained in said cassette, and wherein said pump means includes a chamber in flow communication with first and second valve means within said cassette, said first valve means enabling flow of solution from said solution containing means into said chamber and said second valve means enabling flow of solution from said chamber to an intravenous tubing set, and wherein said reciprocable piston is within said chamber and said first valve means is actuable to an open condition on withdraw of said piston and said second valve means is normally closed during the drawing motion of the piston and opens in response to reverse movement of said piston; motor means contained in said control module; means interconnecting said motor means and said piston member for reciprocating the same; means in circuit relation with said motor means for setting desired fluid flow parameters; means for determining the time duration of movement of said piston member in each direction of travel during operation of said motor means when pumping fluid; and means responsive to the time durations thus determined for determining at least one state of fluid flow and for controlling said motor means in accordance with said desired fluid flow parameters. - View Dependent Claims (31, 32, 33)
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Specification