Permanent magnet solenoid pump for an implantable therapeutic substance delivery device
First Claim
1. An implantable therapeutic substance delivery device comprising:
- a housing;
a therapeutic substance reservoir;
a power source carried in the housing;
electronics carried in the housing, the electronics coupled to the power source; and
,a permanent magnet solenoid pump carried in the housing and coupled to the electronics, the permanent magnet solenoid pump configured for pumping a therapeutic substance from the therapeutic substance reservoir through an infusion outlet, wherein the permanent magnet solenoid pump comprises a pump piston movable within a pump cylinder, a permanent magnet carried on the pump piston, a first coil formed around the pump cylinder and positioned adjacent a first pole of the permanent magnet, a second coil formed around the pump cylinder and positioned adjacent a second pole of the permanent magnet, and a biasing element biasing the pump piston in one direction within the pump cylinder.
1 Assignment
0 Petitions
Accused Products
Abstract
A medical device known as an implantable therapeutic substance delivery device is configured for implanting in humans to deliver a therapeutic substance such as pharmaceutical compositions, genetic materials, and biologics to treat a variety of medical conditions such as pain, spastisity, cancer, and many other conditions. The therapeutic substance delivery device has a permanent magnet solenoid pump that is energy efficient, accurate, small, compatible with therapeutic substances, and has many other improvements. The implantable therapeutic substance delivery device has a housing, a therapeutic substance reservoir, a power source, electronics, and a permanent magnet solenoid pump. The therapeutic substance reservoir is configured to contain a therapeutic substance and is coupled to the housing. The power source is carried in the housing to power the electronics and solenoid pump. The electronics are coupled to the solenoid pump and the solenoid pump is coupled to the therapeutic substance reservoir. The permanent magnet solenoid pump is configured for pumping therapeutic substance from the therapeutic substance reservoir through an infusion outlet at a programmed infusion rate. Many embodiments of the permanent magnet solenoid pump and its methods of operation are possible.
177 Citations
31 Claims
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1. An implantable therapeutic substance delivery device comprising:
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a housing; a therapeutic substance reservoir; a power source carried in the housing; electronics carried in the housing, the electronics coupled to the power source; and
,a permanent magnet solenoid pump carried in the housing and coupled to the electronics, the permanent magnet solenoid pump configured for pumping a therapeutic substance from the therapeutic substance reservoir through an infusion outlet, wherein the permanent magnet solenoid pump comprises a pump piston movable within a pump cylinder, a permanent magnet carried on the pump piston, a first coil formed around the pump cylinder and positioned adjacent a first pole of the permanent magnet, a second coil formed around the pump cylinder and positioned adjacent a second pole of the permanent magnet, and a biasing element biasing the pump piston in one direction within the pump cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An implantable therapeutic substance delivery device comprising:
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a housing; a therapeutic substance reservoir; a power source carried in the housing; electronics carried in the housing, the electronics coupled to the power source; and
,a permanent magnet solenoid pump carried in the housing and coupled to the electronics, the permanent magnet solenoid pump configured for pumping a therapeutic substance from the therapeutic substance reservoir through an infusion outlet, wherein the permanent magnet solenoid pump comprises; a pump piston movable within a pump cylinder, a permanent magnet carried on the pump piston; a first coil formed around the pump cylinder and positioned adjacent a first pole of the permanent magnet; a second coil formed around the pump cylinder and positioned adjacent a second pole of the permanent magnet; a pumping chamber proximate the infusion outlet; an inlet valve through which therapeutic substance passes into the pumping chamber; and an outlet valve through which therapeutic substance passes into the infusion outlet from the pumping chamber; a biasing element biasing the pump piston towards the inlet valve, wherein the biasing element provides a biasing force sufficient to overcome frictional losses during movement of the pump piston within the pump cylinder, open the outlet valve of the pumping chamber, open the inlet valve of the pumping chamber, and overcome pressure losses between the infusion outlet and an infusion site to which the therapeutic substance is to be delivered. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification