Apparatus for infusing medication into the body

Claim 2

In a system for infusing medication into the body, the combination of, a reservoir of medication, a pumping chamber, a medication outlet, a first flow control device connected between said reservoir and said pumping chamber which permits liquid to flow in both directions between said pumping chamber and said reservoir but offers substantially less resistance to liquid flow from said reservoir to said pumping chamber than for liquid flow from said pumping chamber to said reservoir, a second flow control device connected between said pumping chamber and said outlet which permits liquid to flow in both directions between said pumping chamber and said outlet but offers substantially less resistance to liquid flow from said pumping chamber to said outlet than for liquid flow from said outlet to said pumping chamber, means for increasing the volume of said pumping chamber so that liquid flows primarily from said reservoir to said pumping chamber through said first flow control device, and means for decreasing the volume of said pumping chamber so that fluid flows primarily from said pumping chamber to said outlet through said second flow control device.

Claim 3

The combination of claim 1, wherein said means for increasing the volume of said pumping chamber comprises a movable member forming a wall portion of said pumping chamber, an armature connected to said movable member, and electromagnetic means for attracting said armature so that said movable member is moved in the direction to increase the volume of said pumping chamber.

Claim 4

The combination of claim 2, wherein said movable member is a flexible member which is connected to said armature so that the volume of said pumping chamber is increased when said armature is attracted by said electromagnetic means, and means acting to return said armature to its initial position when said armature is no longer attracted by said electromagnetic means, thereby to decrease the volume of said pumping chamber.

Claim 5

The combination of claim 3, which includes means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable member and seated on said valve seat when said flexible member is in said initial position, said valve element being lifted off of said valve seat when said flexible member is moved to increase the volume of said pumping chamber.

Claim 6

The combination of claim 3, which includes means defining a valve seat in said pumping chamber and communicating with said reservoir and a valve element movable with said movable member and seated on said valve seat when said flexible member is in said initial position, said valve element being lifted off of said valve seat when said flexible member is moved to increase tne volume of said pumping chamber.

Claim 7

In a system for infusing liquid into a living body, an infusate reservoir, an infusate outlet, a movably mounted armature of magnetic material, means defining a pumping chamber having a movable wall portion connected to said armature, electromagnetic means for moving said armature so that the volume of said pumping chamber is altered, means defining a valve seat in said pumping chamber and communicating with said infusate outlet, a valve element connected to and movable with said movable wall portion and arranged to be seated on said valve seat, a first directional flow control device connected between said infusate reservoir and said pumping chamber and offering minimum resistance to flow of infusate from said reservoir to said pumping chamber, and a second directional flow control device connected between said pumping chamber and said infusate outlet and offering minimum resistance to flow to infusate from said pumping chamber to said outlet.

Claim 8

In a system for infusing liquid into a living body, an infusate reservoir, an infusate outlet, a movably mounted armature of magnetic material, means defining a pumping chamber having a movable wall portion connected to said armature, electromagnetic means for moving said armature so that the volume of said pumping chamber is altered, means defining a valve seat in said pumping chamber and communicating with said infusate outlet, a valve element connected to and movable with said movable wall portion and arranged to be seated on said valve seat, a first directional flow control device connected between said infusate reservoir and said pumping chamber and offering minimum resistance to flow of infusate from said reservoir to said pumping chamber, and a second directional flow control device connected between said pumping chamber and said infusate outlet and offering minimum resistance to flow to infusate from said pumping chamber to said outlet.

Claim 9

In a system for infusing liquid into a living body, an infusate reservoir, means defining a pumping chamber, an infusate outlet, a movably mounted armature of magnetic material, means defining a pumping chamber having a movable wall portion connected to said armature so that the volume of said pumping chamber is altered, means defining a valve seat in said pumping chamber and communicating with said infusate outlet, a valve element connected to and movable with said movable wall portion and arranged to be seated on said valve seat, and a directional flow control device connected between said pumping chamber and said infusate outlet and offering minimum resistance to flow to infusate from said pumping chamber to said outlet.

Claim 10

In a system for infusing liquid into a living body, an infusate reservoir, means defining a pumping chamber, an infusate outlet, a movably mounted armature of magnetic material, means defining a pumping chamber having a movable wall portion connected to said armature so that the volume of said pumping chamber is altered, means defining a valve seat in said pumping chamber and communicating with said infusate outlet, a valve element connected to and movable with said movable wall portion and arranged to be seated on said valve seat, and a directional flow control device connected between said pumping chamber and said infusate outlet and offering minimum resistance to flow to infusate from said pumping chamber to said outlet.

Claim 11

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element connected to and movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 12

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element connected to and movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 13

An integral valve and pumping unit as set forth in claim 8, which includes a support on which said armature means is movably mounted, and said movable wall portion includes a flexible diaphragm connected at its outer edges to said support and connected to said armature means in the central region thereof.

Claim 14

An integral valve and pumping unit as set forth in claim 9, wherein said diaphragm is of the single convoluted type.

Claim 15

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, a support on which said armature means is movable mounted, said armature means comprising a flat disc having a raised central portion, means defining a pumping chamber including a movable wall portion comprising a flexible diaphragm extending generally parallel to the flat plane of said disc and connected at its outer edges to said support, means connecting said diaphragm to said raised central portion of said armature disc, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said diaphragm and seated on said valve seat when said coil is de-energized, said diaphragm moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 16

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, a support on which said armature means is movable mounted, said armature means comprising a flat disc having a raised central portion, means defining a pumping chamber including a movable wall portion comprising a flexible diaphragm extending generally parallel to the flat plane of said disc and connected at its outer edges to said support, means connecting said diaphragm to said raised central portion of said armature disc, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said diaphragm and seated on said valve seat when said coil is de-energized, said diaphragm moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 17

An integral valve and pumping unit as set forth in claim 11, wherein said raised central portion of said armature disc is in the form of an annular shoulder and said diaphragm is connected to said annular shoulder.

Claim 18

An integral valve and pumping unit as set forth in claim 12, which includes a valve insert of resilient material positioned on said armature disc within said annular shoulder and adapted to engage said valve seat and close said outlet.

Claim 19

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element connected to and movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 20

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element connected to and movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 21

An integral valve and pumping unit as set forth in claim 8, which includes a support on which said armature means is movably mounted, and said movable wall portion includes a flexible member connected to said support.

Claim 22

An integral valve and pumping unit as set forth in claim 14, wherein said flexible member is a diaphragm of the single convoluted type connected at its outer edges to said support and connected to said armature means in the central region thereof.

Claim 23

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, a support on which said armature means is movably mounted, said armature means comprising a flat disc having a raised central portion, means defining a pumping chamber including a movable wall portion comprising a flexible member connected to said support and to said raised central portion of said armature disc, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element movable with said flexible member and seated on said valve seat when said coil is de-energized, said flexible member moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 24

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, a support on which said armature means is movably mounted, said armature means comprising a flat disc having a raised central portion, means defining a pumping chamber including a movable wall portion comprising a flexible member connected to said support and to said raised central portion of said armature disc, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element movable with said flexible member and seated on said valve seat when said coil is de-energized, said flexible member moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 25

The combination of claim 1, which includes a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, said pumping chamber having a movable wall portion connected to said armature means for movement therewith, means defining a valve seat, a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber and lift said valve element off of said valve seat when said coil is energized.

Claim 26

The combination of claim 18, which includes a support on which said armature means is movably mounted, and said movable wall portion includes a flexible member connected between said support and said armature means.

Claim 27

The combination of claim 18, which includes a housing within which said armature means is movably mounted, and said armature means comprising a flat disc having a raised central portion and said movable wall portion comprising a flexible diaphragm extending generally parallel to the flat plane of said disc and connected at its outer edges to said housing, and means connecting said diaphragm to said raised central portion of said armature disc.

Claim 28

The combination of claim 20, wherein said raised central portion of said armature disc is in the form of an annular shoulder and said diaphragm is connected to said annular shoulder.

Claim 29

The combination of claim 21, which includes a valve insert of resilient material positioned on said armature disc within said annular shoulder and adapted to engage said valve seat when said coil is de-energized.

Claim 30

The arrangement of claim 8, which includes a medication reservoir, and a flow control device connected between said reservoir and said medication inlet, said flow control device permitting medication to flow in both directions between said reservoir and said pumping chamber but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir.

Claim 31

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a flow control device connected between said reservoir and said medication inlet, said flow control device permitting medication to flow in both directions between said reservoir and said pumping chamber but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, said flow control device being a vortex type device in which medication is forced to flow in a decreasing spiral from said pumping chamber to said reservoir, a medictaion catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 32

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a flow control device connected between said reservoir and said medication inlet, said flow control device permitting medication to flow in both directions between said reservoir and said pumping chamber but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, said flow control device being a vortex type device in which medication is forced to flow in a decreasing spiral from said pumping chamber to said reservoir, a medictaion catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 33

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a flow control device connected between said reservoir and said medication inlet, said flow control device permitting medication to flow in both directions between said reservoir and said pumping chamber but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, the ratio of resistance to flow from pumping chamber to reservoir to resistance to flow from reservoir to pumping chamber of said flow control device being in the order of 8 to 1, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 34

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a flow control device connected between said reservoir and said medication inlet, said flow control device permitting medication to flow in both directions between said reservoir and said pumping chamber but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, the ratio of resistance to flow from pumping chamber to reservoir to resistance to flow from reservoir to pumping chamber of said flow control device being in the order of 8 to 1, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 35

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a value element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat and a flow control device connected between said pumping chamber and said medication outlet, said flow control device permitting medication to flow in both directions between said outlet and said pumping chamber but offering substantially less resistance to flow of medication from said pumping chamber to said outlet than for flow of medication from said outlet to said pumping chamber.

Claim 36

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a value element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat and a flow control device connected between said pumping chamber and said medication outlet, said flow control device permitting medication to flow in both directions between said outlet and said pumping chamber but offering substantially less resistance to flow of medication from said pumping chamber to said outlet than for flow of medication from said outlet to said pumping chamber.

Claim 37

The arrangement of claim 26, wherein said flow control device is a vortex type device in which medication is forced to flow in a decreasing spiral from said outlet to said pumping chamber.

Claim 38

The arrangement of claim 26, wherein the ratio of resistance to flow from pumping chamber to outlet to resistance to flow from outlet to pumping chamber of said flow control device is in the order of 1 to 8.

Claim 39

The arrangement of claim 8, which includes a medication reservoir, and a directional flow control device connected between said reservoir and said inlet, said device having no moving parts but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir.

Claim 40

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a directional flow control device connected between said reservoir and said inlet, said device having no moving parts but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, the ratio of resistance to flow from pumping chamber to reservoir to resistance to flow from reservoir to pumping chamber of said flow control device being in the order of 8 to 1 a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 41

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a directional flow control device connected between said reservoir and said inlet, said device having no moving parts but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, the ratio of resistance to flow from pumping chamber to reservoir to resistance to flow from reservoir to pumping chamber of said flow control device being in the order of 8 to 1 a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 42

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat, and a directional flow control device connected between said pumping chamber and said outlet, said device having no moving parts but offering substantially less resistance to flow of medication from said pumping chamber to said outlet than for flow of medication from said outlet to said pumping chamber.

Claim 43

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said outlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat, and a directional flow control device connected between said pumping chamber and said outlet, said device having no moving parts but offering substantially less resistance to flow of medication from said pumping chamber to said outlet than for flow of medication from said outlet to said pumping chamber.

Claim 44

The arrangement of claim 31, wherein the ratio of resistance to flow from outlet to pumping chamber to resistance to flow from pumping chamber to outlet of said flow control device is in the order of 8 to 1.

Claim 45

The arrangement of claim 14, which includes a medication reservoir, and a directional flow control device connected between said reservoir and said inlet, said device having no moving parts but offering substantially less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir.

Claim 46

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a directional flow control device connected between said reservoir and said inlet, said device having no moving parts but offering substantailly less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, the ratio of resistance to flow from pumping chamber to reservoir to resistance to flow from reservoir to pumping chamber of said flow control device is in the order of 8 to 1, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve off of said valve seat.

Claim 47

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication reservoir, a directional flow control device connected between said reservoir and said inlet, said device having no moving parts but offering substantailly less resistance to flow of medication from said reservoir to said pumping chamber than for flow of medication from said pumping chamber to said reservoir, the ratio of resistance to flow from pumping chamber to reservoir to resistance to flow from reservoir to pumping chamber of said flow control device is in the order of 8 to 1, a medication catheter outlet, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve off of said valve seat.

Claim 48

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, a directional flow control device connected between said pumping chamber and said outlet, said device having no moving parts but offering substantially less resistance to flow of medication from said pumping chamber to said outlet than for flow of medication from said outlet to said pumping chamber, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 49

A combined valve actuator and pumping unit for use in a system for dispensing medication into the body, comprising a magnetic core, a coil mounted on said core, armature means arranged to complete a magnetic flux path with said core and moved in response to energization of said coil, means defining a pumping chamber including a movable wall portion connected to said armature means for movement therewith, a medication inlet to said pumping chamber, a medication catheter outlet, a directional flow control device connected between said pumping chamber and said outlet, said device having no moving parts but offering substantially less resistance to flow of medication from said pumping chamber to said outlet than for flow of medication from said outlet to said pumping chamber, means defining a valve seat in said pumping chamber and communicating with said inlet, and a valve element movable with said movable wall portion and seated on said valve seat when said coil is de-energized, said movable wall portion moving in a direction to increase the volume of said pumping chamber in response to movement of said armature means when said coil is energized while at the same time lifting said valve element off of said valve seat.

Claim 50

The arragnement of claim 35 wherin the ratio of resistance to flow from outlet to pumping chamber to resistance to flow from pumping chamber to outlet of said flow control device is in the order of 8 to 1.