Medication delivery system having selective automated or manual discharge
First Claim
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1. A medication delivery system comprising:
- a) an infusion pump including, a fluid storage chamber for storing fluid medication, a displacement piston displacably positionable to expand or contract said fluid storage chamber, an elastic member transitionable between a more stressed position and a less stressed position to displace said displacement piston, a pump outlet for discharging a fluid from said infusion pump in response to displacement of said displacement piston, a pump flowpath providing fluid communication between said fluid storage chamber and said pump outlet, wherein said pump flowpath has a flow restriction and a drip chamber with a drip chamber wall, an upper portion, and a lower portion, and wherein said flow restriction is sized to convert a continuous stream of a fluid entering said flow restriction from said fluid storage chamber to a drip stream exiting said flow restriction into said drip chamber, and an outlet tube positioned beneath said flow restriction in said lower portion of said drip chamber and extending toward said upper portion, said outlet tube having a smaller cross section than said drip chamber to define a fluid accumulation space between said outlet tube and said drip chamber wall where at least some of said fluid exiting said flow restriction into said drip chamber accumulates; and
b) a bolus injector positioned downstream of said fluid storage chamber in fluid communication with said fluid storage chamber, said bolus injector including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber, and an injector outlet from said bolus chamber.
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Abstract
A portable medication delivery system enables a patient to elect slow continuous auto-administration or rapid bolus self-administration of a fluid medication. The medication delivery system has an infusion pump, which includes a fluid storage chamber and a spring-driven piston positioned in the fluid storage chamber. The fluid storage chamber is initially charged with the medication and the infusion pump automatically delivers a continuous dosage of the medication at a first flow rate over a long time from the fluid storage chamber to a treatment site in the patient. A bolus injector is positioned in series or in parallel with the infusion pump and is charged with a bolus dosage of the treatment fluid from the fluid storage chamber for alternate manual self-injection of the medication into the treatment site at a higher second flow rate for a short time. The infusion pump flowpath includes a drip chamber having an in-line flow restriction, which converts a continuous flow stream from the fluid storage chamber to a drip stream. A sight window in the drip chamber permits the user to visually confirm the flow of medication through the infusion pump.
98 Citations
25 Claims
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1. A medication delivery system comprising:
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a) an infusion pump including, a fluid storage chamber for storing fluid medication, a displacement piston displacably positionable to expand or contract said fluid storage chamber, an elastic member transitionable between a more stressed position and a less stressed position to displace said displacement piston, a pump outlet for discharging a fluid from said infusion pump in response to displacement of said displacement piston, a pump flowpath providing fluid communication between said fluid storage chamber and said pump outlet, wherein said pump flowpath has a flow restriction and a drip chamber with a drip chamber wall, an upper portion, and a lower portion, and wherein said flow restriction is sized to convert a continuous stream of a fluid entering said flow restriction from said fluid storage chamber to a drip stream exiting said flow restriction into said drip chamber, and an outlet tube positioned beneath said flow restriction in said lower portion of said drip chamber and extending toward said upper portion, said outlet tube having a smaller cross section than said drip chamber to define a fluid accumulation space between said outlet tube and said drip chamber wall where at least some of said fluid exiting said flow restriction into said drip chamber accumulates; and
b) a bolus injector positioned downstream of said fluid storage chamber in fluid communication with said fluid storage chamber, said bolus injector including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber, and an injector outlet from said bolus chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A medication delivery system comprising:
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a) an infusion pump including, a fluid storage chamber for storing fluid medication, a displacement piston displacably positionable to expand or contract said fluid storage chamber, an elastic member transitionable between a more stressed position and a less stressed position to displace said displacement piston, a pump outlet for discharging fluid from said infusion pump in response to displacement of said displacement piston, a pump flowpath providing fluid communication between said fluid storage chamber and said pump outlet, wherein said pump flowpath has a flow restriction and a drip chamber with a drip chamber wall, an upper portion, and a lower portion, and wherein said flow restriction is sized to convert a continuous stream of a fluid entering said flow restriction from said fluid storage chamber to a drip stream exiting said flow restriction into said drip chamber, and an outlet tube positioned beneath said flow restriction in said lower portion of said drip chamber and extending toward said upper portion, said outlet tube having a smaller cross section than said drip chamber to define a fluid accumulation space between said outlet tube and said drip chamber wall where at least some of said fluid exiting said flow restriction into said drip chamber accumulates; and
b) a bolus injector positioned in series with said infusion pump including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber and connected to said pump outlet, and an injector outlet from said bolus chamber. - View Dependent Claims (21)
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17. A medication delivery system comprising:
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a) an infusion pump including, a fluid storage chamber, a displacement piston displacably positionable to expand or contract said fluid storage chamber, an elastic member transitionable between a more stressed position and a less stressed position to displace said displacement piston, a first pump outlet for discharging fluid from said infusion pump in response to displacement of said displacement piston, a second pump outlet for discharging fluid from said infusion pump in response to displacement of said displacement piston, a pump flowpath providing fluid communication between said fluid storage chamber and said first pump outlet, wherein said pump flowpath has a flow restriction and a drip chamber with a drip chamber wall, an upper portion, and a lower portion, and wherein said flow restriction is sized to convert a continuous stream of a fluid entering said flow restriction from said fluid storage chamber to a drip stream exiting said flow restriction into said drip chamber, and an outlet tube positioned beneath said flow restriction in said lower portion of said drip chamber and extending toward said upper portion, said outlet tube having a smaller cross section than said drip chamber to define a fluid accumulation space between said outlet tube and said drip chamber wall where at least some of said fluid exiting said flow restriction into said drip chamber accumulates; and
b) a bolus injector in fluid communication with said fluid storage chamber including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber and connected to said second pump outlet, and an injector outlet from said bolus chamber. - View Dependent Claims (22)
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18. A medication delivery system comprising:
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a) a first infusion pump including, a first fluid storage chamber, a first displacement piston displacably positionable to expand or contract said first fluid storage chamber, a first elastic member transitionable between a more stressed position and a less stressed position to displace said first displacement piston, and a first pump outlet for discharging fluid from said first infusion pump in response to displacement of said first displacement piston;
b) a second infusion pump including, a second fluid storage chamber, a second displacement piston displacably positionable to expand or contract said fluid storage chamber, a second elastic member transitionable between a more stressed position and a less stressed position to displace said second displacement piston, a second pump outlet for discharging fluid from said second infusion pump in response to displacement of said second displacement piston, a pump flowpath providing fluid communication between said first fluid storage chamber and said first pump outlet, wherein said pump flowpath has a flow restriction and a drip chamber with a drip chamber wall, an upper portion, and a lower portion, and wherein said flow restriction is sized to convert a continuous stream of a fluid entering said flow restriction from said first fluid storage chamber to a drip stream exiting said flow restriction into said drip chamber, and an outlet tube positioned beneath said flow restriction in said lower portion of said drip chamber and extending toward said upper portion, said outlet tube having a smaller cross section than said drip chamber to define a fluid accumulation space between said outlet tube and said drip chamber wall where at least some of said fluid exiting said flow restriction into said drip chamber accumulates; and
c) a bolus injector positioned in series with said second infusion pump including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber and connected to said second pump outlet, and an injector outlet from said bolus chamber. - View Dependent Claims (23)
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19. A medication delivery system comprising:
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a) an infusion pump including, a fluid storage chamber for storing fluid medication, a displacement piston displacably positionable to expand or contract said fluid storage chamber, an elastic member transitionable between a more stressed position and a less stressed position to displace said displacement piston, a pump outlet for discharging a fluid from said infusion pump in response to displacement of said displacement piston, and a pump flowpath providing fluid communication between said fluid storage chamber and said pump outlet, said pump flowpath including a flow restriction, a drip chamber, a sight window, and an outlet tube, wherein said drip chamber has a drip chamber wall, an upper portion, and a lower portion, said flow restriction exiting into said drip chamber and said outlet tube positioned beneath said flow restriction in said drip chamber separated from said flow restriction by a drip gap, said sight window oriented to enable visual contact with said drip chamber, wherein said flow restriction is sized to convert a continuous stream of fluid entering said flow restriction from said fluid storage chamber to a drip stream exiting said flow restriction into said drip chamber and wherein said outlet tube extends toward said upper portion, said outlet tube having a smaller cross section than said drip chamber to define a fluid accumulation space between said outlet tube and said drip chamber wall where at least some of said fluid exiting said flow restriction into said drip chamber accumulates; and
b) a bolus injector positioned downstream of said fluid storage chamber in fluid communication with said fluid storage chamber, said bolus injector including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber, and an injector outlet from said bolus chamber. - View Dependent Claims (20, 24)
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25. A medication delivery system comprising:
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a) a first infusion pump including, a first fluid storage chamber, a first displacement piston displacably positionable to expand or contract said first fluid storage chamber, and a first elastic member transitionable between a more stressed position and a less stressed position to displace said first displacement piston, and a first pump outlet for discharging fluid from said first infusion pump in response to displacement of said first displacement piston;
b) a second infusion pump including, a second fluid storage chamber, a second displacement piston displacably positionable to expand or contract said second fluid storage chamber, a second elastic member transitionable between a more stressed position and a less stressed position to displace said second displacement piston, and a second pump outlet for discharging fluid from said second infusion pump in response to displacement of said second displacement piston; and
c) a bolus injector positioned in series with said second infusion pump including, a flexible bladder, a bolus chamber enclosed by said flexible bladder, an injector inlet into said bolus chamber and connected to said second pump outlet, and an injector outlet from said bolus chamber.
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Specification
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Current AssigneeLMA North America Incorporated (Teleflex Incorporated)
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Original AssigneeBreg Incorporated (Breg Acquisition Corp.)
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InventorsMason, Jeffrey T.
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Primary Examiner(s)Casler, Brian L.
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Assistant Examiner(s)Maiorino, Roz
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Application NumberUS09/935,392Publication NumberTime in Patent Office1,147 DaysField of Search604/192-198, 604/263, 604/264, 604/506, 604/117, 604/411, 604/110, 604/65, 604/242-240, 604/131, 604/80, 604/132, 604/247, 604/141-150, 604/251, 604/151, 604/891.1, 604/294, 613/2, 614/0, 128/200.14, 128/200.22, 128/203.12, 128/74-76, 446/473US Class Current604/141CPC Class CodesA61M 2005/1405 Patient controlled analgesi...A61M 5/1411 Drip chambers A61M5/162, A6...A61M 5/1454 spring-actuated, e.g. by a ...A61M 5/165 Filtering accessories, e.g....
