Pulsatile rotary ventricular pump
A roller pump conduit defining a pump chamber is provided. The roller pump conduit includes a roller contact portion having a fill region and a delivery region. The fill region has a first taper configured to determine volume delivery per revolution of a roller head. The delivery region has a pressure region having a second taper and a discharge region having a third taper. The third taper has a lesser degree of taper than the second taper. The delivery region is configured to produce a pulsatile flow out of the conduit. Furthermore, a roller pump having a roller pump conduit is provided. The roller pump conduit of the roller pump has a fill region and a delivery region, the fill region having a first taper, and the delivery region having a second and third taper, wherein the third taper has a lesser degree of taper than the second taper.
1. A roller pump conduit defining a pump chamber comprising:
a roller contact portion having a fill region and a delivery region,
the fill region having a first taper and being configured to determine volume delivery per revolution of a roller head,
the delivery region comprising:
a pressure region having a second taper; and
a discharge region having a third taper, the third taper having a lesser degree of taper than the second taper;
the delivery region being configured to produce a pulsatile flow out of the conduit.
2. The roller pump conduit of claim 1 , wherein the degree of taper of the third taper is equal to about zero.
3. The roller pump conduit of claim 2 , wherein the discharge region has a constant width.
4. The roller pump conduit of claim 1 , wherein the degree of taper of the first taper is equal to about zero.
5. The roller pump conduit of claim 4 , wherein the fill region has a constant width.
6. The roller pump conduit of claim 1 , wherein the pressure region is configured to produce a systolic portion of the pulsatile flow.
7. The roller pump conduit of claim 1 , wherein the discharge region is configured to produce a diastolic portion of the pulsatile flow.
8. The roller pump conduit of claim 1 , further comprising a bias region operable to receive fluid into the conduit.
9. The roller pump conduit of claim 8 , wherein the bias region comprises a low volume shut-off region, operable to stop the flow of fluid into the fill region when the shut-off region is compressed.
10. The roller pump conduit of claim 1 , wherein the conduit is manufactured by injection molding.
11. A roller pump for pumping fluids, comprising:
a plurality of rollers located in spaced apart relation, the rollers attached to a rotor having a drive shaft;
a flexible conduit in mechanical communication with at least two of the plurality of rollers, the flexible conduit comprising:
a roller contact portion having a fill region and a delivery region,
the fill region having a first taper and being configured to determine volume delivery per revolution of a roller head,
the delivery region comprising:
a pressure region having a second taper; and
a discharge region having a third taper, the third taper having a lesser degree of taper than the second taper;
the delivery region being configured to produce a pulsatile flow out of the conduit.
12. The roller pump of claim 11 , wherein the degree of taper of the third taper is equal to about zero.
13. The roller pump of claim 12 , wherein the discharge region has a constant width.
14. The roller pump of claim 11 , wherein the degree of taper of the first taper is equal to about zero.
15. The roller pump of claim 14 , wherein the fill region has a constant width.
16. The roller pump of claim 11 , wherein the pressure region of the flexible conduit is configured to produce a systolic portion of the pulsatile flow.
17. The roller pump conduit of claim 11 , wherein the discharge region of the flexible conduit is configured to produce a diastolic portion of the pulsatile flow.
18. The roller pump of claim 11 , wherein the flexible conduit further comprises a bias region operable to receive fluid into the conduit.
19. The roller pump of claim 18 , wherein the bias region of the flexible conduit comprises a low volume shut-off region, operable to stop the flow of fluid into the fill region when the shut-off region is compressed.
20. The roller pump of claim 11 , wherein the flexible conduit is manufactured by injection molding.