Implantable medication delivery device using pressure regulator
First Claim
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1. An implantable medication delivery device comprising;
- an implantable housing having a fill port and an outlet port;
a medication reservoir in said housing in communication with said fill port; and
a flow path in said housing coupling said reservoir to said outlet port, said flow path including pressure regulator means operable to isolate said reservoir from said outlet port in response to an increase in reservoir pressure in excess of a threshold level.
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Abstract
An implantable medication delivery apparatus including a flow path coupling a medication reservoir to a device outlet port where the flow path includes a regulator means for limiting the magnitude of pressure transferred downstream from the medication reservoir. The regulator means is configured to respond to the reservoir pressure exceeding a certain threshold for closing a valve located downstream from the reservoir. The valve closure functions to isolate the device outlet port from further reservoir pressure increases which otherwise could induce unintended medication flow from the device outlet port.
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Citations
24 Claims
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1. An implantable medication delivery device comprising;
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an implantable housing having a fill port and an outlet port;
a medication reservoir in said housing in communication with said fill port; and
a flow path in said housing coupling said reservoir to said outlet port, said flow path including pressure regulator means operable to isolate said reservoir from said outlet port in response to an increase in reservoir pressure in excess of a threshold level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medication delivery device adapted for implantation in a patient'"'"'s body comprising:
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an implantable housing having a fill port and an outlet port;
a reservoir in said housing for storing fluid medication from said fill port;
a flow path in said housing coupling said reservoir to said outlet port, said flow path including;
a normally open valve;
a medication chamber located downstream from said valve for receiving fluid medication from said reservoir; and
pressure responsive means operable to close said valve in response to pressure in said chamber exceeding a threshold level. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of operating a medication delivery device to avoid overpressurization of a medication reservoir inducing unintended medication delivery from a device outlet port, said method comprising:
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comparing the pressure in said medication reservoir to a threshold level; and
closing a normally open flow path coupling said reservoir to said outlet port in response to said reservoir pressure exceeding said threshold level.
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20. A method of delivering fluid medication from a reservoir to a patient'"'"'s body site comprising:
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providing a reservoir having a fill port; and
providing a flow path for transferring medication from said reservoir to an outlet port where said flow path includes a normally open valve, a medication chamber downstream from said valve, and a pressure responsive mechanism operable to close said valve in response to the pressure in said chamber exceeding a threshold level. - View Dependent Claims (21, 22, 23, 24)
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Specification