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Peristaltic pump header
| Details |
Inventors: Parrott, Patti L.; Howell, James B.;
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Examiner: Croyle; Carlton R.
Assistant Examiner: Olds; Theodore
Attorney, Agent or Firm: Sell; Donald M., Hoke, II; Robert W.
A pump header for use in a peristaltic pump. The pump header includes a flexible outer tube, a collapsible-expandable inner tube, a pressure control valve member and a one-way-flow valve member. The inner tube is disposed within a passageway of the outer tube. The pressure control valve member and the one-way-flow valve member are responsive to positively-pressured liquid at an inlet to the inner tube and allow the liquid to enter a passageway of the inner tube from which the fluid can be pumped by the action of the peristaltic pump. The positively pressured liquid can only pass from the one-way-flow valve member. |
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DETAILED DESCRIPTION Referring to the figures of the drawing, there is shown in FIG.
1 a schematic view of a preferred embodiment of the pump header 10 of the present invention in a system 12 suitable for venting the left ventricle 14 of a heart 16 during coronary artery bypass grafting.
The system 12 is generally comprised of a vent 18, a peristaltic pump 20 and a cardiotomy reservoir 22.
The vent 18 is placed in conventional fashion with its tip 24 generally disposed within the left ventricle 14 of the heart 16.
Attached to the vent 18 opposite the tip 24 is a suitable, medical-grade tubing 26.
A suitable vent 18 is a left ventricular vent catheter, Part Number 10610, available from Sarns/3M, Ann Arbor, Mich.
, U.
S.
A.
Attached to the medical-grade tubing 26 opposite the vent 18 is the pump header 10.
This establishes fluid communication between the left ventricle 14 and the pump header 10; blood 28 within the left ventricle 14 can pass into the tip 24 of the vent 18 and be delivered to the pump header 10 via the tubing 26.
The pump header 10 is shown in longitudinal sectional view in FIGS.
5A, 5B, 6 and 8 to comprise a flexible outer tube 30, a collapsible-expandible and preferably elastomeric inner tube 32, a pressure control valve member 34 and a one-way-flow valve member 36.
As perhaps best shown in FIGS.
3 and 7, the outer tube 30 has an inlet 38, an outlet 40 and a passageway 42 there between.
Similarly, the inner tube 32 has an inlet 44, an outlet 46 and a passageway 48 there between.
The inner tube 32 is generally disposed within the passageway 42 of the outer tube 30.
The inner tube 32 is preferably comprised of polyvinyl chloride having about 55 Durometer Shore A hardness and having a 0.
38 mm wall thickness, available from Natvar Company, Clayton, NC.
, U.
S.
A.
The inner tube 32 is preferably structurally capable of total and repeated collapse and expansion.
The outer tube 30 is preferably comprised of polyvinyl chloride having 55-85 Durometer Shore A hardness and having a 1.
77 mm wall thickness, available from Natvar Company, Clayton, NC
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Heart Surgery 
