Infusion device and driving mechanism and process for same with actuator for multiple infusion uses
First Claim
1. A coil cup composed of a magnetizable material, the coil cup comprising:
- a generally annular inner wall having one end defining an inner pole surface of the coil cup;
a generally annular outer wall having a first inner diameter and a first outer diameter, the outer wall having a generally annular shelf portion extending from the outer wall towards the inner wall, the shelf portion having a second inner diameter and a second outer diameter, the second inner diameter being smaller than the first inner diameter, the shelf portion having a second end defined by the second inner and outer diameters, the second end defining at least a portion of an outer pole surface of the coil cup; and
a generally annular interior between the inner and outer walls, the annular interior containing a coil.
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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. 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. The armature may be configured with a reduced diameter by including a coil cup for supporting the coil including a shelf portion defining at least a portion of a pole surface of the coil cup.
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Citations
63 Claims
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1. A coil cup composed of a magnetizable material, the coil cup comprising:
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a generally annular inner wall having one end defining an inner pole surface of the coil cup;
a generally annular outer wall having a first inner diameter and a first outer diameter, the outer wall having a generally annular shelf portion extending from the outer wall towards the inner wall, the shelf portion having a second inner diameter and a second outer diameter, the second inner diameter being smaller than the first inner diameter, the shelf portion having a second end defined by the second inner and outer diameters, the second end defining at least a portion of an outer pole surface of the coil cup; and
a generally annular interior between the inner and outer walls, the annular interior containing a coil. - View Dependent Claims (2, 3)
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4. A coil cup composed of a magnetizable material, the coil cup comprising:
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a generally annular outer wall having one end defining an outer pole surface of the coil cup;
a generally annular inner wall having a first inner diameter and a first outer diameter, the inner wall having a generally annular shelf portion extending from the inner wall towards the outer wall, the shelf portion having a second inner diameter and a second outer diameter, the second outer diameter being greater than the first outer diameter, the shelf portion having a second end defining at least a portion of an inner pole surface of the coil cup; and
a generally annular interior between the outer and inner walls, the annular interior containing a coil. - View Dependent Claims (5, 6)
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7. A coil cup composed of a magnetizable material, the coil cup comprising:
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a generally annular outer wall having a first inner diameter and a first outer diameter, the outer wall having a generally annular outer shelf portion extending from the outer wall towards the inner wall, the outer shelf portion having a second inner diameter and a second outer diameter, the second inner diameter being smaller than the first inner diameter, the outer shelf portion having one end defined by the second inner and outer diameters, the one end defining at least a portion of an outer pole surface of the coil cup;
a generally annular inner wall having a third inner diameter and a third outer diameter, the inner wall having a generally annular inner shelf portion extending from the inner wall towards the outer wall, the inner shelf portion having a fourth inner diameter and a fourth outer diameter, the fourth outer diameter being greater than the third outer diameter, the inner shelf portion having a second end defining at least a portion of an inner pole surface of the coil cup; and
a generally annular interior between the outer and inner walls, the annular interior containing a coil. - View Dependent Claims (8, 9, 10, 11)
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12. A drive mechanism comprising:
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a piston channel;
a coil surrounding the piston channel;
a piston located within the piston channel and moveable axially within the piston channel;
a coil cup supporting the coil, the coil cup including;
a generally annular inner wall having one end defining an inner pole surface of the coil cup;
a generally annular outer wall having a first inner diameter and a first outer diameter, the outer wall having a generally annular outer shelf portion extending from the outer wall towards the inner wall, the outer shelf portion having a second inner diameter and a second outer diameter, the second inner diameter being smaller than the first inner diameter, the outer shelf portion having a second end defined by the second inner and outer diameters, the second end defining at least a portion of an outer pole surface of the coil cup; and
a generally annular interior between the inner and outer walls, the annular interior containing the coil; and
an armature disposed adjacent the coil on one side of the piston channel the armature having inner pole and outer pole surfaces for acting with the inner and outer pole surfaces of the coil cup to provide an electromagnetic flux path upon electrical activation of the coil, the electromagnetic flux path for drawing the armature towards the coil cup and for moving the piston axially within the piston channel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A drive mechanism for delivery of infusion medium comprising:
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an inlet for receiving infusion medium;
a piston channel;
a coil surrounding the piston channel;
a piston located within the piston channel, the piston having a central channel extending through an axial length of the piston and having openings at both ends of the piston, the central channel for conveying infusion medium received by the inlet, the piston being moveable axially within the piston channel to drive infusion medium into the central channel;
an armature disposed adjacent the coil, on one side of the piston channel;
an outlet chamber disposed adjacent the coil, on the opposite side of the piston channel relative to the armature for receiving infusion medium from the central channel; and
an outlet in flow communication with the outlet chamber, for discharging infusion medium from the outlet chamber. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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Specification