Linear peristaltic pump
First Claim
Patent Images
1. Linear peristaltic pump comprising:
- (a) a support plate;
(b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; and
(c) Pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising;
(i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube,(ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube,(iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, wherein each of the at least one intermediate cam has three curve portions, namely a first portion with a continuously increasing radius for a pressing phase, a second, circumferential portion with a constant radius equal to the radius at the end of the first portion for maintaining the flexible tube closed, and a third portion with a sharp decrease of the radius for quick release of the flexible tube, and(iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube.
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Accused Products
Abstract
The invention relates to linear peristaltic pump of known contruction, in which a first cam (30a) and a first cam follower (11a) in the form of an input valve, at least three intermediate cams (30b-30e) and cam followers (11b-11e) for pumping operation and a last cam (30f) and a last cam follower (11f) in the form of an output valve are used.
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Citations
16 Claims
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1. Linear peristaltic pump comprising:
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(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; and (c) Pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising; (i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, wherein each of the at least one intermediate cam has three curve portions, namely a first portion with a continuously increasing radius for a pressing phase, a second, circumferential portion with a constant radius equal to the radius at the end of the first portion for maintaining the flexible tube closed, and a third portion with a sharp decrease of the radius for quick release of the flexible tube, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube. - View Dependent Claims (2, 3, 4, 5)
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6. Linear peristaltic pump comprising:
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(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; and (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising; (i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, and (v) an additional flow linearizing cam on the cam shaft after the last cam and having a linearizing cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft, the linearizing cam having an increasing radius portion with a maximum radius corresponding to a largest radius on the last cam, the linearizing cam also having a decreasing radius portion for a remainder thereof, the linearizing cam having a smallest radius so that the linearizing cam follower just touches the flexible tube. - View Dependent Claims (7)
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8. Linear peristaltic pump comprising.
(a) a support plate; -
(b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising; (i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube; and (d) an ultra-low displacement pressure transducer placed on the support plate under the flexible tube at a longitudinal position of the flexible tube between the first cam follower and the last cam follower, the pressure transducer for producing an output signal, an upper surface of the pressure transducer being flush with an upper surface of the support plate. - View Dependent Claims (9, 10, 11, 12, 13)
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14. Linear peristaltic pump comprising:
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(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising; (i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam. each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube; and (d) an air eliminating filter and an anti-syphon valve permanently connected in series with a patient line. - View Dependent Claims (15)
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16. Linear peristaltic pump comprising:
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(a) a support plate; (b) a flexible tube supported on the support plate and having an input end connected to a fluid reservoir as well as an output end; (c) pumping operation device for squeezing the flexible tube in an operation sequence traveling along the flexible tube from the input end to the output end, the pumping operation device comprising; (i) a motor-driven cam shaft having an axis and being rotatable supported in parallel to the flexible tube, (ii) an input valve for opening and closing the flexible tube at the input end, the input valve having a first cam on the cam shaft and a first cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube, (iii) at least one intermediate cam angularly displaced on the cam shaft relative to the first cam and an intermediate cam follower for each intermediate cam, each intermediate cam follower being mounted for reciprocating movement in a direction normal to the axis of the cam shaft and having an end face for squeezing the flexible tube, the at least one intermediate cam and each cam follower mounted to perform a pumping operation, and (iv) an output valve for opening and closing the flexible tube at the output end, the output valve having a last cam angularly displaced on the cam shaft relative to the first cam and the at least one intermediate cam, the output valve also having a last cam follower mounted for reciprocating movement in a direction normal to the axis of the cam shaft and provided with an end face for squeezing the flexible tube; and (d) a reservoir provided with a filling valve which is actuated by a syringe for refilling the reservoir.
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Specification