Infusion device and driving mechanism for same
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0 Petitions
Accused Products
Abstract
A drive mechanism for delivery of infusion medium a coil capable of being electrically activated to provide an electromagnetic field. The coil surrounds a piston channel extending in an axial direction. The piston channel provides a passage for communication of infusion medium to an outlet chamber located at one end of the piston channel. An armature is located adjacent the coil, on one side of the axial channel. The armature is moveable toward a forward position, in response to the electromagnetic field produced by activation of the coil. A piston is located within the piston channel and is moveable axially within the channel to a forward position, in response to movement of the armature to its forward position. The armature and piston are moved toward a retracted position, when the coil is not energized. In the retracted position of the piston, a piston chamber is formed between the piston and a valve member and is filled with infusion medium. As the piston is moved to its forward position, the piston chamber volume is reduced and pressure within the piston chamber increases to a point where the pressure moves the valve member into an open position. When the valve member is in the open position, medium from the piston chamber is discharged into an outlet chamber located on the opposite side of the coil relative to the armature. An outlet is provided in flow communication with the outlet chamber, for discharging infusion medium from the outlet chamber.
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Citations
21 Claims
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1-5. -5. (Canceled)
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6. A drive mechanism for delivery of infusion medium comprising:
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an inlet for receiving infusion medium;
an outlet for discharging infusion medium;
a channel through which infusion medium is communicated between the inlet and the outlet;
a piston moveable between an quiescent position and a forward position to drive infusion medium from the piston channel toward the outlet;
a valve member facing a first end of the channel, the valve member being moveable between closed and open positions to open and close the first end of the channel in conjunction with movement of the piston between quiescent and forward positions; and
a valve seat located adjacent the end of the channel that faces the valve member for contacting the valve member when the valve member is in closed position;
the valve member including at least one generally rigid stop surface for contacting the valve seat upon the valve member being in a closed position, the valve member further including a generally compliant portion extending toward the valve seat, beyond the generally rigid stop surface for contacting the valve seat when the valve member is in a closed position, wherein the valve seat includes at least one projecting surface arranged to contact the at least one stop surface, upon the valve member being in the closed position. - View Dependent Claims (7, 8, 9)
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10. A drive mechanism for delivery of infusion medium comprising:
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an inlet for receiving infusion medium;
an outlet for discharging infusion medium;
a channel through which infusion medium is communicated between the inlet and the outlet;
a piston moveable between an quiescent position and a forward position to drive infusion medium from the piston channel toward the outlet;
a valve member facing a first end of the channel, the valve member being moveable between closed and open positions to open and close the first end of the channel in conjunction with movement of the piston between quiescent and forward positions; and
a valve seat located adjacent the end of the channel that faces the valve member for contacting the valve member when the valve member is in closed position;
the valve member including at least one generally rigid stop surface for contacting the valve seat upon the valve member being in a closed position, the valve member further including a generally compliant portion extending toward the valve seat, beyond the generally rigid stop surface for contacting the valve seat when the valve member is in a closed position, wherein the valve seat includes at least one projecting surface arranged to contact the compliant portion of the valve member, upon the valve member being in the closed position. - View Dependent Claims (11, 12)
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13-16. -16. (Canceled)
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17. A drive mechanism for delivery of infusion medium comprising:
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an inlet for receiving infusion medium;
an outlet for discharging infusion medium;
a channel through which infusion medium is communicated between the inlet and the outlet;
a piston moveable between an quiescent position and a forward position to drive infusion medium from the piston channel toward the outlet, a valve member facing a first end of the channel, the valve member being moveable between closed and open positions to open and close the first end of the channel in conjunction with movement of the piston between quiescent and forward positions; and
a valve seat located adjacent the end of the channel that faces the valve member for contacting the valve member when the valve member is in closed position, the valve seat including a generally rigid surface and at least one compliant member;
the valve member including at least one generally rigid stop surface for contacting the generally rigid surface of the valve seat upon the valve member being in a closed position, the valve member further including at least one projection arranged to contact the at least one compliant member of the valve seat, upon the valve member being in the closed position. - View Dependent Claims (18, 19, 20, 21)
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Specification