Manual basal bolus drug delivery device
A fully manually powered infusion device provides both basal and bolus delivery of a liquid medicament to a patient. In some embodiments, the device includes a main reservoir that supplies the liquid medicament, an outlet port that delivers the liquid medicament to the patient, a basal dispenser that delivers a substantially constant flow of the liquid medicament to the outlet port, and a manually actuated bolus pump that delivers a bolus dose of the liquid medicament from the main reservoir to the outlet when actuated. The basal medicament supply delivers a volume of the liquid medicament from the main reservoir to the basal dispenser consonant with each actuation of the bolus pump.
1. A fully manually powered infusion device that provides both basal and bolus delivery of a liquid medicament to a patient, comprising:
a main reservoir that supplies the liquid medicament;
an outlet port that delivers the liquid medicament to a patient;
a basal dispenser that delivers a substantially constant flow of the liquid medicament to the outlet port;
a manually actuated bolus pump comprising a piston pump that delivers a bolus dose of the liquid medicament from the main reservoir to the outlet when actuated;
a basal medicament supply comprising a piston pump that delivers a volume of the liquid medicament from the main reservoir to the basal dispenser consonant with each actuation of the bolus pump;
wherein the bolus piston pump and the basal medicament supply piston pump each have a return stroke;
a common actuator that manually actuates the bolus piston pump and the basal medicament supply piston pump together;
wherein the bolus piston pump and the basal medicament supply piston pump are recharged with the liquid medicament from the main reservoir during the return strokes.
2. A fully manually powered infusion device that provides both basal and bolus delivery of a liquid medicament to a patient, comprising:
a main reservoir that supplies the liquid medicament;
an outlet port that delivers the liquid medicament to a patient;
a basal dispenser that delivers a substantially constant flow of the liquid medicament to the outlet port;
a manually actuated bolus pump comprising a piston pump that delivers a bolus dose of the liquid medicament from the main reservoir to the outlet when actuated;
a basal medicament supply comprising a piston pump that delivers a volume of the liquid medicament from the main reservoir to the basal dispenser consonant with each actuation of the bolus pump, wherein the bolus piston pump and the basal medicament supply piston pump each have a return stroke;
a common actuator that manually actuates the bolus piston pump and the basal medicament supply piston pump together;
wherein the bolus piston pump and the basal medicament supply piston pump share a common piston and piston chamber, wherein the basal medicament supply is recharged as a bolus of the liquid medicament is delivered to the outlet, and wherein the bolus pump is recharged as the basal medicament supply delivers the volume of the liquid medicament to the basal dispenser.
3. The device of claim 1 or 2 , further comprising an overflow liquid path from the basal medicament supply to the main reservoir to permit the basal dispenser to be maintained in a full state.
4. The device of claim 1 or 2 , further comprising a shuttle valve that, when in a first position, establishes first concurrent flow paths for recharging the basal medicament supply and for delivering the bolus to the outlet and when in a second position, establishes second concurrent flow paths for recharging the bolus pump and for delivering the volume of the liquid medicament to the basal dispenser.
5. The device of claim 4 , wherein the shuttle valve establishes an additional flow path from the basal dispenser to the reservoir when in the second position to provide overflow for maintaining the basal dispenser in a full state.
6. The device of claim 1 or 2 , wherein the basal dispenser has a fill capacity and wherein the basal medicament supply fills the basal dispenser to its fill capacity with each actuation of the bolus pump.
7. The device of claim 6 , wherein the basal medicament supply comprises a fluid path from the main reservoir to the basal dispenser.
8. The device of claim 7 , wherein the fluid path includes a one way valve.
9. The device of claim 7 , wherein the basal dispenser comprises a reservoir and wherein actuation of the bolus pump causes liquid medicament from the main reservoir to be drawn into and fill the basal dispenser reservoir.
10. The device of claim 1 or 2 , wherein the basal dispenser includes a supply chamber having a volume sufficient to enable the dispenser to deliver the substantially constant flow of the liquid medicament to the outlet port for an extended period of time.
11. The device of claim 4 or 5 , wherein the basal dispenser delivers the substantially constant flow of the liquid medicament to the outlet port under energy stored as a direct result of and solely due to the manual actuation of the bolus pump.
12. The device of claim 1 , wherein the bolus piston pump and the basal medicament supply piston pump share a common piston and piston chamber, wherein the basal medicament supply is recharged as a bolus of the liquid medicament is delivered to the outlet, and wherein the bolus pump is recharged as the basal medicament supply delivers the volume of the liquid medicament to the basal dispenser.
13. The device of claim 1 or 2 , wherein the volume of liquid medicament delivered to the basal dispenser is larger than the bolus dose of liquid medicament.