Compliant rotor for an improved cartridge for drug infusion pump
First Claim
1. In a segmented peristaltic cartridge comprising a housing, a cover, and an open segment therebetween, said combination defining pump and chamber therein, said cartridge having respective inlet and outlet ports at opposite ends thereof, the housing including a rear segment wherein an arc of approximately 240°
- forms the internal periphery thereof, the cover, having an arc of approximately 240°
which forms the internal periphery thereof, is joined to the housing, a tubing track is created by the space between said housing and said cover, said inlet and outlet ports being formed by the mating of said housing and cover segments, and a pump frame engaging said housing at the open segment thereof and providing a surface completing a missing chord of said tubing track, an improved rotor including an eccentric rotor and rotor shaft disposed in said chamber in the cartridge between said rear housing and said front cover, a sleeve mounted on the rotor, a length of resilient tubing spirally wrapped around said sleeve to be disposed in said tubing track, and having opposite ends engaging respective inlet and outlet ports of the cartridge, the improved rotor including;
a cylindrical body portion including an interior bore received on a motor shaft associated with the motor frame;
an outer cylindrical surface thereof; and
an eccentric structure mounted on the outer cylindrical surface of the rotor, said eccentric structure comprising at least one pair of base portions extending generally radially outwardly from the outer cylindrical surface of the rotor and spaced apart on the rotor cylindrical outer surface, a first beam member mounted at one end at the upper end of a first base portion, and an opposite end of the first beam member projecting outwardly from said first base portion, a second beam member having its one end mounted on an upper end of a second base portion, and an opposite end of the second beam member projecting outwardly from said second base portion, both first and second beam members disposed a common distance above the cylindrical outer surface of the rotor and generally concentric therewith, with the respective opposite ends of the beam members projecting toward each other but spaced apart at respective opposite ends thereof whereby in the assembled housing including said housing segment, cover segment, eccentric rotor, rotor sleeve and tube, the eccentric rotor engages said resilient tubing when the cartridge engages the motor frame and the rotor is connected to a rotational drive means, the flexible eccentric structure of the rotor enabling delivery of liquid medicant to a patient with increased reliability.
2 Assignments
0 Petitions
Accused Products
Abstract
An improved rotor for use with a segmented peristaltic cartridge comprising a housing and a cover for assembly, said assembled housing and cover defining a pumping chamber which holds the improved rotor, a rotor sleeve and a section of flexible tubing wrapped around the rotor and connected to respective inlet and outlet ports of the cartridge. The flexible rotor includes an eccentric structure wherein flexible beam members provided on an outer surface of the rotor form a compliant member which improves the flexibility of the rotor assembly to avoid excessive compression loads or high torque and/or dynamic leak back or low torque for the tubing in the cartridge.
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Citations
15 Claims
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1. In a segmented peristaltic cartridge comprising a housing, a cover, and an open segment therebetween, said combination defining pump and chamber therein, said cartridge having respective inlet and outlet ports at opposite ends thereof, the housing including a rear segment wherein an arc of approximately 240°
- forms the internal periphery thereof, the cover, having an arc of approximately 240°
which forms the internal periphery thereof, is joined to the housing, a tubing track is created by the space between said housing and said cover, said inlet and outlet ports being formed by the mating of said housing and cover segments, and a pump frame engaging said housing at the open segment thereof and providing a surface completing a missing chord of said tubing track, an improved rotor including an eccentric rotor and rotor shaft disposed in said chamber in the cartridge between said rear housing and said front cover, a sleeve mounted on the rotor, a length of resilient tubing spirally wrapped around said sleeve to be disposed in said tubing track, and having opposite ends engaging respective inlet and outlet ports of the cartridge, the improved rotor including;a cylindrical body portion including an interior bore received on a motor shaft associated with the motor frame; an outer cylindrical surface thereof; and an eccentric structure mounted on the outer cylindrical surface of the rotor, said eccentric structure comprising at least one pair of base portions extending generally radially outwardly from the outer cylindrical surface of the rotor and spaced apart on the rotor cylindrical outer surface, a first beam member mounted at one end at the upper end of a first base portion, and an opposite end of the first beam member projecting outwardly from said first base portion, a second beam member having its one end mounted on an upper end of a second base portion, and an opposite end of the second beam member projecting outwardly from said second base portion, both first and second beam members disposed a common distance above the cylindrical outer surface of the rotor and generally concentric therewith, with the respective opposite ends of the beam members projecting toward each other but spaced apart at respective opposite ends thereof whereby in the assembled housing including said housing segment, cover segment, eccentric rotor, rotor sleeve and tube, the eccentric rotor engages said resilient tubing when the cartridge engages the motor frame and the rotor is connected to a rotational drive means, the flexible eccentric structure of the rotor enabling delivery of liquid medicant to a patient with increased reliability.
- forms the internal periphery thereof, the cover, having an arc of approximately 240°
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2. An improved rotor usable in a segmented peristaltic cartridge, the improved rotor disposed in a chamber of the cartridge, a sleeve mounted on the rotor, a length of resilient tubing looped around said sleeve and having opposite ends engaging respective inlet and outlet ports of the cartridge, the rotor comprising:
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a cylindrical body portion including an interior bore; an outer cylindrical surface thereof; an eccentric structure mounted on the outer cylindrical surface of the rotor, said eccentric structure including at least one pair of base portions extending generally radially outwardly from the outer cylindrical surface of the rotor and spaced apart on the rotor cylindrical outer surface; a first beam member mounted at one end at the upper end of a first base portion, an opposite end of the first beam member projecting outwardly from said first base portion; and a second beam member having its one end mounted on an upper end of a second base portion, and an opposite end of the second beam member projecting outwardly from said second base portion, both first and second beam members disposed a common distance above the cylindrical outer surface of the rotor and generally concentric therewith, with the respective opposite ends of the beam members projecting toward each other but spaced apart at respective ends thereof; the flexible eccentric structure of the rotor enabling delivery of liquid medicant to a patient with increased reliability. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An improved rotor usable in a segmented peristaltic cartridge comprising a housing, a cover, and an open segment therebetween, said combination defining a pump and a chamber therein, said cartridge having respective inlet and outlet ports at opposite ends thereof, the housing including a rear segment wherein an arc of approximately 240°
- forms the internal periphery thereof, the cover, having an arc of approximately 240°
which forms the internal periphery thereof, is joined to the housing, a tubing track is created by the space between said housing and said cover, said inlet and outlet ports being formed by the mating of said housing and cover segments, and a pump frame engaging said housing at the open segment thereof and providing a surface completing a missing chord of said tubing track, the improved rotor including an eccentric rotor and rotor shaft disposed in said chamber in the cartridge between said rear housing and said front cover, a sleeve mounted on the rotor, a length of resilient tubing spirally wrapped around said sleeve to be disposed in said tubing track and having opposite ends engaging respective inlet and outlet ports of the cartridge, the improved rotor including;a cylindrical body portion including an interior bore received on a motor shaft associated with the motor frame; an outer cylindrical surface thereof; and an eccentric structure mounted on the outer cylindrical surface of the rotor, said eccentric structure comprising at least one pair of base portions extending radially outwardly from the outer cylindrical surface of the rotor and spaced apart on the rotor cylindrical outer surface, a first beam member carried at the upper end of a first base portion, the first beam member cantilever-mounted on the first base portion, with one end of the first beam member mounted on the first base portion and an opposite end of the first beam member projecting outwardly from said first base portion, a second beam member having its one end mounted on an upper end of a second base portion, and an opposite end projecting outwardly from said second base portion, both first and second beam members disposed a common distance above the cylindrical outer surface of the rotor and generally concentric therewith, with the respective opposite ends of the beam members projecting toward each other but spaced apart at respective opposite ends thereof, whereby in the assembled housing including, with said housing segment, cover segment, eccentric rotor, rotor sleeve and tubing, the eccentric rotor engaging said resilient tubing when the cartridge engages the motor frame and the rotor is connected to a rotational drive means, the flexible eccentric structure of the rotor enabling delivery of liquid medicant to a patient with increased reliability.
- forms the internal periphery thereof, the cover, having an arc of approximately 240°
Specification