WO2000048652A1 - Negative pressure infusion pump - Google Patents
Negative pressure infusion pump Download PDFInfo
- Publication number
- WO2000048652A1 WO2000048652A1 PCT/US2000/004263 US0004263W WO0048652A1 WO 2000048652 A1 WO2000048652 A1 WO 2000048652A1 US 0004263 W US0004263 W US 0004263W WO 0048652 A1 WO0048652 A1 WO 0048652A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- medication
- gas
- infusion pump
- reservoir
- chamber
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
- A61M5/14276—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body specially adapted for implantation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2209/00—Ancillary equipment
- A61M2209/04—Tools for specific apparatus
- A61M2209/045—Tools for specific apparatus for filling, e.g. for filling reservoirs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/14212—Pumping with an aspiration and an expulsion action
- A61M5/14224—Diaphragm type
Definitions
- the present invention relates to medication infusion pumps, more particularly implantable infusion pumps.
- Medication infusion pumps that supply a medication to a patient, in particular implantable infusion pumps, are known.
- Known infusion pumps typically include a housing that contains a medication chamber and a propellant chamber, together with appropriate means for loading the selected medication into the medication chamber and for supplying the medication to the patient.
- One known type of infusion pump includes a reservoir containing a gas at a pressure below atmospheric pressure.
- Such infusion pumps are characterized as "negative pressure" pumps.
- Negative pressure pumps offer the advantage of facilitating fill of the medication chamber by acting to draw in the medication from a hypodermic needle or other supply source into the medication chamber. Such pumps also have the advantage of inhibiting undesirable leakage from the medication chamber. Negative pressure infusion pumps are described, for example, in U.S. Patent
- a first aspect of the invention provides a medication infusion pump that includes a housing; a medication chamber defined within the housing; a means for supplying the medication from the medication chamber to a patient; a reservoir defined within the housing and adapted to apply a predetermined negative pressure to the medication chamber; and a gas within the reservoir, wherein the gas has a vapor pressure less than ambient atmospheric pressure at normal human physiological temperature.
- a second aspect of the invention provides a medication infusion pump adapted to be passively refilled with a medication wherein the medication infusion pump includes a reservoir that contains a gas having a vapor pressure less than ambient atmospheric pressure at normal human physiological temperature.
- a third aspect of the invention provides a method of supplying a medication to a patient from a medication infusion pump, wherein the infusion pump includes a housing, a medication chamber defined within the housing, a pumping mechanism for supplying the medication from the medication chamber to the patient, and a reservoir defined within the housing and adapted to apply a predetermined negative pressure to a medication within the medication chamber, the method including the steps of (i) filling the reservoir with a gas having a vapor pressure less than ambient atmospheric pressure at normal human physiological temperature, (ii) drawing the medication into the medication chamber by exertion of the predetermined negative pressure on the medication, and (iii) dispensing the medication from the medication chamber via the pumping mechanism.
- Additional aspects of the invention use a gas in the first through third aspects that includes a non-ozone depleting gas. Additional aspects of the invention use a gas in the first through third aspects that includes a non-toxic gas.
- Additional aspects of the invention use a gas in the first through third aspects that includes a non-toxic and non-ozone depleting gas. Additional aspects of the invention use a gas that has a vapor pressure less than 14.7 psia at 37°C.
- Additional aspects of the invention use a gas that has a vapor pressure less than 10.7 psia at 37°C.
- Additional aspects of the invention select the gas from the group consisting of cyclopentane, 2,2-dimethylbutane, 1 ,3-pentadiene, and 2-methyl-2-butene.
- Additional aspects of the invention select the gas from the group consisting of cyclopentane and dimethylbutane.
- Additional aspects of the invention provide a plurality of gases having a combined vapor pressure less than 14.7 psia at 37°C. Additional aspects of the invention separate a chamber for containing medication from the reservoir by a barrier which is resistant to the gas.
- FIG. 1 is a side sectional view of a negative pressure medication infusion pump according to the present invention that employs a flexible bladder as the gas reservoir, and
- FIG. 2 is a schematic representation, partially cut-away, of a portion of an alternative embodiment of a negative pressure medication infusion pump according to the present invention that employs a corrugated gas reservoir.
- Gases are “non-toxic” for the purposes of this invention if they comply with the standard established in ISO 10993. Gases are also “non-toxic” for the purposes of this invention if they are included in the inventory of the United States Toxic Substances Control Act.
- ODP Ozone Depletion Potential
- Gases useful according to the present invention have a vapor pressure less than ambient atmospheric pressure at normal human physiological temperature (37°C). More particularly, the gas has a vapor pressure less than sea level atmospheric pressure (i.e. 14.7 psia) at 37°C. Preferably, the gas has a vapor pressure less than 10.7 psia at 37°C. Exemplary gases include cyclopentane (vapor pressure 9.4 psia at 37°C) and 2,2-dimethylbutane (vapor pressure 9.6 psia at 37°C).
- Other useful gases include 1 ,3-pentadiene (vapor pressure 12.50 at 37°C), 2-methyl-2-butene (vapor pressure 14.24 psia at 37°C), and methyl iodide (vapor pressure 11.10 psia at 37°C).
- Other branched chain fluoroalkanes and fluoroalkenes are also suitable for use according to the instant invention.
- Gases having vapor pressures lower than 10.7 psia at 37°C are particularly desirable in that infusion pumps that employ such gases can be effectively used even at relatively high altitudes.
- the vapor pressure of 2,2- dimethylbutane, 9.4 psia corresponds to an altitude of about 12,000 feet above sea level.
- the vapor pressure of cyclopentane, 9.6 psia corresponds to an altitude of about 11 ,500 feet.
- use of the foregoing preferred gases in accordance with the present invention allows the infusion pump to be employed in almost all major population centers and most mountain areas, as well as in aircraft. When implanted in a human patient, these embodiments of the infusion pump allow the patient to travel freely.
- mixture of two or more gases are also useful according to the instant invention, provided that the mixture is capable of maintaining a pressure less than 14.7 psia, more preferably less than 10.7 psia.
- the gas or gas mixture maintains the reservoir at a pressure less than 14.7 psia, more preferably less than 10.7 psia, at 37°C when the medication chamber is filled and also when the medication is unfilled.
- the stablity of the vapor pressure may be obtained by ensuring that a sufficient quantity of the fill gas material (i.e. liquid phase and gas phase material) is placed in the fill gas reservoir. This may be achieved by ensuring that some liquid phase portion of the fill gas material remains in the reservoir when the medication chamber is empty. It is also preferred that some of the fill gas remain in the gaseous state when the medication chamber is full.
- FIG. 1 a schematic representation of a first embodiment of a medication infusion pump 10 according to the invention includes a housing 12 within which a medication chamber 14 is defined.
- a pumping mechanism 16 is provided for supplying a medication from medication chamber 14 to a patient.
- the pumping mechanism 16 include a pump 18, control circuitry 20, battery 22 and catheter 24.
- Other known means for supplying a medication from medication chamber 14 can also be employed.
- a medication is loaded into medication chamber 14, for example, via an inlet or refill fitting 26 adapted to receive a hypodermic needle (not shown).
- Reservoir 28 is defined within housing 12.
- reservoir 28 is a flexible and expansible bag formed from a polymeric material and secured within housing 12.
- reservoir 28 can be defined by a flexible membrane that extends across the interior of housing 12.
- the selected gas or gas mixture is supplied to reservoir 28 at the selected pressure by conventional means known to those skilled in the art.
- a medication is loaded into medication chamber 14, for example, via an inlet or refill fitting 26 adapted to receive a hypodermic needle (not shown). Due to the negative pressure maintained in reservoir 22, the medication is passively drawn into the medication chamber 14, and is subsequently dispensed via pump 18.
- an alternative embodiment of a medication infusion pump 110 employs a reservoir defined by a flexible corrugated structure.
- Housing 112 has defined therein medication chamber 1 14.
- Pumping mechanism 116 for supplying the medication from medication chamber 114 to a patient includes pump 118, control circuitry and battery (not shown), and catheter 120.
- Reservoir 122 is defined within housing 112 and is separated from medication chamber 114 by flexible corrugated structure 124.
- Structure 124 is preferably formed from a corrugated metal, for example titanium.
- the material used to form structure 124 is preferably substantially impermeable to the gas mixture, the selected medication, and any gases dissolved in the medication.
- the selected gas or gas mixture is supplied to reservoir 122 by conventional means known to those skilled in the art.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00908735A EP1152785A1 (en) | 1999-02-19 | 2000-02-18 | Negative pressure medical infusion pump |
JP2000599441A JP2002537027A (en) | 1999-02-19 | 2000-02-18 | Negative pressure infusion pump |
CA002363694A CA2363694C (en) | 1999-02-19 | 2000-02-18 | Negative pressure infusion pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/253,383 US6283943B1 (en) | 1999-02-19 | 1999-02-19 | Negative pressure pump |
US09/253,383 | 1999-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000048652A1 true WO2000048652A1 (en) | 2000-08-24 |
Family
ID=22960044
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/004263 WO2000048652A1 (en) | 1999-02-19 | 2000-02-18 | Negative pressure infusion pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US6283943B1 (en) |
EP (2) | EP1510230A1 (en) |
JP (1) | JP2002537027A (en) |
CA (1) | CA2363694C (en) |
WO (1) | WO2000048652A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2003030970A1 (en) * | 2001-10-02 | 2003-04-17 | Daiken Iki Kabushiki Kaisha | Medicinal liquid injector having filling auxiliary function |
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US5607418A (en) * | 1995-08-22 | 1997-03-04 | Illinois Institute Of Technology | Implantable drug delivery apparatus |
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US5957890A (en) * | 1997-06-09 | 1999-09-28 | Minimed Inc. | Constant flow medication infusion pump |
-
1999
- 1999-02-19 US US09/253,383 patent/US6283943B1/en not_active Expired - Lifetime
-
2000
- 2000-02-18 EP EP04077727A patent/EP1510230A1/en not_active Withdrawn
- 2000-02-18 JP JP2000599441A patent/JP2002537027A/en active Pending
- 2000-02-18 WO PCT/US2000/004263 patent/WO2000048652A1/en not_active Application Discontinuation
- 2000-02-18 EP EP00908735A patent/EP1152785A1/en not_active Withdrawn
- 2000-02-18 CA CA002363694A patent/CA2363694C/en not_active Expired - Fee Related
Patent Citations (3)
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EP0488701A1 (en) * | 1990-11-29 | 1992-06-03 | Minimed Inc., doing business as Minimed Technologies | Liquid-vapour pressure reservoir for medication infusion pump |
US5722957A (en) * | 1995-03-17 | 1998-03-03 | Fresenius Ag | Implantable infusion pump |
WO1997040873A1 (en) * | 1996-04-30 | 1997-11-06 | Medtronic, Inc. | Propellant mixture for implantable drug pump |
Non-Patent Citations (1)
Title |
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See also references of EP1152785A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003030970A1 (en) * | 2001-10-02 | 2003-04-17 | Daiken Iki Kabushiki Kaisha | Medicinal liquid injector having filling auxiliary function |
Also Published As
Publication number | Publication date |
---|---|
CA2363694A1 (en) | 2000-08-24 |
EP1510230A1 (en) | 2005-03-02 |
EP1152785A1 (en) | 2001-11-14 |
CA2363694C (en) | 2008-02-05 |
US6283943B1 (en) | 2001-09-04 |
JP2002537027A (en) | 2002-11-05 |
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