Reservoir plunger head systems and methods
First Claim
1. A system for transferring fluidic media, the system comprising:
- a plunger head moveable in an axial direction within a reservoir having an interior volume for containing fluidic media, the plunger head comprising;
a first portion in contact with fluidic media when fluidic media is in the interior volume of the reservoir;
a second portion located on an opposite side of the first portion of the plunger head from the interior volume of the reservoir, the second portion connectable to a plunger arm; and
a third portion located between the first portion and the second portion of the plunger head;
wherein the first portion, the second portion, and the third portion of the plunger head are supported for moving together in the axial direction within the reservoir; and
at least one seal member positioned between the reservoir and the plunger head;
wherein the at least one seal member is positioned between the first portion and the second portion of the plunger head;
wherein the first portion of the plunger head has an outer diameter, the second portion of the plunger head has an outer diameter and the third portion of the plunger head between the first portion and the second portion has an outer diameter that is reduced relative to the outer diameters of the first portion and the second portion of the plunger head, and wherein the at least one seal member comprises a seal located around the third portion of the plunger head; and
wherein the first portion comprises at least one protrusion arranged along an outer surface defined by the outer diameter of the first portion, the at least one protrusion is configured for at least one of stabilizing the plunger head and controlling the compression of the at least one seal member.
1 Assignment
0 Petitions
Accused Products
Abstract
A plunger head moveable in an axial direction within a reservoir having an interior volume for containing fluidic media may have a first portion in contact with fluidic media when fluidic media is in the interior volume of the reservoir, the first portion comprising a first material compatible with fluidic media in the interior volume of the reservoir, a second portion located on an opposite side of the plunger head from the interior volume of the reservoir, the second portion connectable to a plunger arm, and a third portion located between the first portion and the second portion of the plunger head, at least one of the first portion, second portion, and the third portion is made of a material that comprises one of a cyclic olefin copolymer and a cyclic olefin polymer.
90 Citations
17 Claims
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1. A system for transferring fluidic media, the system comprising:
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a plunger head moveable in an axial direction within a reservoir having an interior volume for containing fluidic media, the plunger head comprising; a first portion in contact with fluidic media when fluidic media is in the interior volume of the reservoir; a second portion located on an opposite side of the first portion of the plunger head from the interior volume of the reservoir, the second portion connectable to a plunger arm; and a third portion located between the first portion and the second portion of the plunger head; wherein the first portion, the second portion, and the third portion of the plunger head are supported for moving together in the axial direction within the reservoir; and at least one seal member positioned between the reservoir and the plunger head; wherein the at least one seal member is positioned between the first portion and the second portion of the plunger head; wherein the first portion of the plunger head has an outer diameter, the second portion of the plunger head has an outer diameter and the third portion of the plunger head between the first portion and the second portion has an outer diameter that is reduced relative to the outer diameters of the first portion and the second portion of the plunger head, and wherein the at least one seal member comprises a seal located around the third portion of the plunger head; and wherein the first portion comprises at least one protrusion arranged along an outer surface defined by the outer diameter of the first portion, the at least one protrusion is configured for at least one of stabilizing the plunger head and controlling the compression of the at least one seal member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of making a system for transferring fluidic media, the method comprising:
providing a plunger head moveable in an axial direction within a reservoir having an interior volume for containing fluidic media, the plunger head comprising;
a first portion in contact with fluidic media when fluidic media is in the interior volume of the reservoir;
a second portion located on an opposite side of the first portion of the plunger head from the interior volume of the reservoir, the second portion connectable to a plunger arm; and
a third portion located between the first portion and the second portion of the plunger head;
supporting the first portion, the second portion, and the third portion of the plunger head for moving together in the axial direction within the reservoir; and
providing at least one seal member at a position between the reservoir and the plunger head, the position of the at least one seal member being between the first portion and the second portion of the plunger head;
wherein the first portion of the plunger head has an outer diameter, the second portion of the plunger head has an outer diameter and the third portion of the plunger head between the first portion and the second portion has an outer diameter that is reduced relative to the outer diameters of the first portion and the second portion of the plunger head, and wherein the at least one seal member comprises a seal located around the third portion of the plunger head; and
wherein the first portion comprises at least one protrusion arranged along an outer surface defined by the outer diameter of the first portion, the at least one protrusion is configured for at least one of stabilizing the plunger head and controlling the compression of the at least one seal member.
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16. A system for transferring fluidic media, the system comprising:
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a plunger head moveable in an axial direction within a reservoir having an interior volume for containing fluidic media, the plunger head comprising; a first portion in contact with fluidic media when fluidic media is in the interior volume of the reservoir, the first portion comprising a first material compatible with fluidic media in the interior volume of the reservoir; a second portion located on an opposite side of the first portion of the plunger head from the interior volume of the reservoir, the second portion connectable to a plunger arm; and a third portion located between the first portion and the second portion of the plunger head; wherein the first portion, the second portion, and the third portion of the plunger head are supported for moving together in the axial direction within the reservoir; wherein at least one of the first portion, the second portion, and the third portion is made of a material that comprises one of a cyclic olefin copolymer and a cyclic olefin polymer; and wherein the second portion comprises a second material different from the first material; and at least one seal member positioned between the reservoir and the plunger head; wherein the at least one seal member is positioned between the first portion and the second portion of the plunger head; and a first diameter of the first portion, a second diameter of the second portion, and a third diameter of the third portion, wherein the first diameter and the second diameter are equal. - View Dependent Claims (17)
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Specification