Pump, motor and assembly for beneficial agent delivery
First Claim
1. A peristaltic pump for delivery of a beneficial agent to a user, comprising:
- a motor;
a cam shaft coupled to the motor for rotation about a longitudinal axis of the cam shaft, the cam shaft having a radially-outward projection defining a helical engagement portion disposed continuously along a length of the cam shaft; and
a plurality of finger plates disposed along the length of the cam shaft, each finger plate mounted for movement in a transverse direction relative to the longitudinal axis of the cam shaft, each finger plate having an aperture defined therein to receive the cam shaft therethrough, each aperture defined by a substantially straight edge region and an opposing edge region, each finger plate further having a substantially flat surface contacting an adjacent finger plate and a recessed area within and surrounded by the surface, the recessed area being configured to reduce surface friction between the contacting surfaces of the adjacent finger plates;
wherein engagement of the helical engagement portion with the substantially straight edge region of each finger plate during rotation of the cam shaft urges the finger plate transversely toward an extended position.
1 Assignment
0 Petitions
Accused Products
Abstract
Pump includes a motor and a cam shaft coupled to the motor for rotation about a longitudinal axis of the cam shaft. The cam shaft has at least one radially-outward projection defining a helical engagement portion disposed along a length of the cam shaft. A plurality of finger plates are disposed along the length of the cam shaft, each finger plate mounted for movement in a transverse direction relative to the longitudinal axis of the cam shaft. Each finger plate has an aperture defined therein to receive the cam shaft therethrough. Each aperture has a substantially straight edge region and an opposing edge region. Engagement of the helical engagement portion with the substantially flat edge region during rotation of the cam shaft urges the finger plate transversely toward an extended position.
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Citations
29 Claims
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1. A peristaltic pump for delivery of a beneficial agent to a user, comprising:
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a motor; a cam shaft coupled to the motor for rotation about a longitudinal axis of the cam shaft, the cam shaft having a radially-outward projection defining a helical engagement portion disposed continuously along a length of the cam shaft; and a plurality of finger plates disposed along the length of the cam shaft, each finger plate mounted for movement in a transverse direction relative to the longitudinal axis of the cam shaft, each finger plate having an aperture defined therein to receive the cam shaft therethrough, each aperture defined by a substantially straight edge region and an opposing edge region, each finger plate further having a substantially flat surface contacting an adjacent finger plate and a recessed area within and surrounded by the surface, the recessed area being configured to reduce surface friction between the contacting surfaces of the adjacent finger plates; wherein engagement of the helical engagement portion with the substantially straight edge region of each finger plate during rotation of the cam shaft urges the finger plate transversely toward an extended position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification