Disposable cassette for a medication infusion system
First Claim
Patent Images
1. A disposable cassette for use with a medication infusion system, comprising:
- a cassette body having an upper surface, said cassette body including a cylinder disposed below the upper surface of said cassette, one end of said cylinder being sealingly attached to the bottom of said upper surface, the other end of said cylinder being open, said upper surface of said cassette body having disposed therein first, second, and third apertures extending therethrough, said second aperture being in communication with the interior of said cylinder at said on end thereof;
piston means located in said cylinder for varying the fluid volume contained in said cylinder by alternately drawing fluid into said cylinder through said second aperture and forcing fluid out of said cylinder through said second aperture;
an inlet passageway recessed into said upper surface of said cassette body, said inlet passageway being open on the top side of said upper surface, one end of said inlet passageway being in fluid communication with said first aperture through which fluid is supplied to sad inlet passageway, the other end of said inlet passageway being located near to said second aperture;
an outlet passageway recessed into said upper surface of said cassette body, said outlet passageway being open on the top side of said upper surface, one end of said outlet passageway being located near to said second aperture, the other end of said outlet passageway being in fluid communication with said third aperture through which fluid is removed from said outlet passageway;
diaphragm means for sealing the open top sides of said inlet and outlet passageways; and
flexible, resilient domed valve means for forming a cavity over a portion of said upper surface of said cassette body including said other end of said inlet passageway, said second aperture, and said one end of said outlet passageway, said cavity being in fluid communication with said inlet passageway, said second aperture leading to said cylinder, and said outlet passageway, said valve means being selectively deformable to prevent the flow of fluids between said inlet passageway and said second aperture, said valve means also being selectively deformable to prevent the flow of fluids between said second aperture and said outlet passageway.
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Accused Products
Abstract
A disposable cassette containing a fluid pump for use with a main unit including apparatus for driving the pump is disclosed which cassette utilized a piston-type pump in conjunction with active valves to pump fluid. The inlet and outlet channels in the cassette are formed by a diaphragm covering open channels in the cassette body, and the same diaphragm is used to form the active valves, which are actuated by valve actuators in the main pump unit. Additional features of the cassette include an air trap upstream from the pump, and an integral clamp which allows priming of the cassette.
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Citations
19 Claims
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1. A disposable cassette for use with a medication infusion system, comprising:
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a cassette body having an upper surface, said cassette body including a cylinder disposed below the upper surface of said cassette, one end of said cylinder being sealingly attached to the bottom of said upper surface, the other end of said cylinder being open, said upper surface of said cassette body having disposed therein first, second, and third apertures extending therethrough, said second aperture being in communication with the interior of said cylinder at said on end thereof; piston means located in said cylinder for varying the fluid volume contained in said cylinder by alternately drawing fluid into said cylinder through said second aperture and forcing fluid out of said cylinder through said second aperture; an inlet passageway recessed into said upper surface of said cassette body, said inlet passageway being open on the top side of said upper surface, one end of said inlet passageway being in fluid communication with said first aperture through which fluid is supplied to sad inlet passageway, the other end of said inlet passageway being located near to said second aperture; an outlet passageway recessed into said upper surface of said cassette body, said outlet passageway being open on the top side of said upper surface, one end of said outlet passageway being located near to said second aperture, the other end of said outlet passageway being in fluid communication with said third aperture through which fluid is removed from said outlet passageway; diaphragm means for sealing the open top sides of said inlet and outlet passageways; and flexible, resilient domed valve means for forming a cavity over a portion of said upper surface of said cassette body including said other end of said inlet passageway, said second aperture, and said one end of said outlet passageway, said cavity being in fluid communication with said inlet passageway, said second aperture leading to said cylinder, and said outlet passageway, said valve means being selectively deformable to prevent the flow of fluids between said inlet passageway and said second aperture, said valve means also being selectively deformable to prevent the flow of fluids between said second aperture and said outlet passageway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A disposable cassette for use with a medication infusion system, comprising:
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a cassette body having an upper surface, said cassette body including a cylinder disposed below the upper surface of said cassette, one end of said cylinder being sealingly attached to the bottom of said upper surface, the other end of said cylinder being open, said cassette body also including a bubble chamber disposed below the upper surface of said cassette body, said bubble chamber being open on the bottom side thereof, a siphon tube extending from the bottom of said upper surface nearly to the bottom of said bubble chamber, said cassette body also including an outlet tube disposed below the upper surface of said cassette, said upper surface of said cassette body having disposed therein first, second, and third apertures extending therethrough, said first aperture extending through said siphon tube, said second aperture being in communication with the interior of said cylinder at said one end thereof, said third aperture extending through said outlet tube; a bubble chamber cap for sealing the open bottom of said bubble chamber, said bubble chamber cap including an inlet tube extending up into said bubble chamber from the bottom thereof above the bottom of said siphon tube; piston means located in said cylinder for varying the fluid volume contained in said cylinder by alternately drawing fluid into said cylinder through said second aperture and forcing fluid out of said cylinder through said second aperture; an inlet passageway recessed into said upper surface of said cassette body, said inlet passageway being open on the top side of said upper surface, one end of said inlet passageway being in fluid communication with said bubble chamber through said first aperture through which fluid is supplied to said inlet passageway, the other end of said inlet passageway being located near to said second aperture; an outlet passageway recessed into said upper surface of said cassette body, said outlet passageway being open on the top side of said upper surface, one end of said outlet passageway being located near to said second aperture, the other end of said outlet passageway being in fluid communication with said outlet tube through third aperture through which fluid is removed from said outlet passageway; diaphragm means for sealing the open top sides of said inlet and outlet passageways and flexible, resilient domed valve means for forming a cavity over a portion of said upper surface of said cassette body including said other end of said inlet passageway, said second aperture, and said one end of said outlet passageway, said cavity being in fluid communication with said inlet passageway, said second aperture leading to said cylinder, and said outlet passageway, said valve means being selectively deformable to prevent the flow of fluids between said inlet passageway and said second aperture, said valve means also being selectively deformable to prevent the flow of fluids between said second aperture and said outlet passageway.
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18. A disposable cassette for use with a medication infusion system, comprising:
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a cassette body having an upper surface which has disposed therein first, second, and third apertures extending therethrough, said upper surface of said cassette body having an inlet passageway recessed therein which inlet passageway extends between said first aperture and a location near to said second aperture, said upper surface of said cassette body also having an outlet passageway recessed therein which outlet passageway extends between said a location near to second aperture and said third aperture, said inlet and outlet passageways being open on the top side of said upper surface; a cylinder disposed below the upper surface of said cassette, one end of said cylinder being sealingly attached to the bottom of said upper surface, the other end of said cylinder being open, said second aperture being in communication with the interior of said cylinder at said one end thereof; piston means located in said cylinder for varying the fluid volume contained in said cylinder by alternately drawing fluid into said cylinder through said second aperture and forcing fluid out of said cylinder through said second aperture; diaphragm valve means for sealing the open top sides of said inlet and outlet passageways, a portion of said diaphragm means forming a cavity over a portion of said upper surface of said cassette body including said other end of said inlet passageway, said second aperture, and said one end of said outlet passageway, said cavity being in fluid communication with said inlet passageway, said second aperture leading to said cylinder, and said outlet passageway, said portion of said diaphragm valve means being selectively deformable to prevent the flow of fluids between said inlet passageway and said second aperture, said portion of said diaphragm valve means also being selectively deformable to prevent the flow of fluids between said second aperture and said outlet passageway.
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19. A method of making a disposable cassette for use with a medication infusion system, comprising:
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locating a cylinder below the upper surface of a cassette body, one end of said cylinder being sealingly attached to the bottom of said upper surface, the other end of said cylinder being open, said upper surface of said cassette body having disposed therein first, second, and third apertures extending therethrough, said second aperture being in communication with the interior of said cylinder at said one end thereof; installing piston means in said cylinder to allow the fluid volume contained in said cylinder to be varied by alternately drawing fluid into said cylinder through said second aperture and forcing fluid out of said cylinder through said second aperture; providing an inlet passageway recessed into said upper surface of said cassette body, said inlet passageway being open on the top side of said upper surface, one end of said inlet passageway being in fluid communication with said first aperture through which fluid is supplied to said inlet passageway, the other end of said inlet passageway being located near to said second aperture; providing an outlet passageway recessed into said upper surface of said cassette body, said outlet passageway being open on the top side of said upper surface, one end of said outlet passageway being located near to said second aperture, the other end of said outlet passageway being in fluid communication with said third aperture through which fluid is removed from said outlet passageway; sealing the open top sides of said inlet and outlet passageways with diaphragm means; and forming a cavity over a portion of said upper surface of said cassette body including said other end of said inlet passageway, said second aperture, and said one end of said outlet passageway with flexible, resilient domed valve means, said cavity being in fluid communication with said inlet passageway, said second aperture leading to said cylinder, and said outlet passageway, said valve means being selectively deformable to prevent the flow of fluids between said inlet passageway and said second aperture, said valve means also being selectively deformable to prevent the flow of fluids between said second aperture and said outlet passageway.
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Specification