Bolus delivery device

1. A bolus delivery device, comprising:

a housing;

a reservoir disposed within the housing for receipt of a volume of a fluid, the reservoir defined by an activation dome and a reservoir seat;

a piston axially disposed within the reservoir and extending through an orifice in the reservoir seat;

a seal member disposed around a distal end of the piston and against a distal end of the orifice of the reservoir seat, where the seal member is free to slide along the piston;

a bladder disposed in the housing, the bladder in fluid communication with the reservoir for receipt of the fluid from the reservoir;

an actuator;

an inlet conduit in fluid communication with the reservoir for providing the fluid to the reservoir, and an outlet conduit in fluid communication with the bladder for providing the fluid to a patient,

wherein the actuator is in operative communication with the reservoir to initiate a flow of the fluid from the reservoir to the bladder, and

wherein the bladder expands as the bladder receives the fluid and contracts as the bladder dispenses the fluid.

2. The bolus delivery device of claim 1 , wherein the reservoir seat is located between the activation dome and the bladder such that the reservoir seat is distal to the activation dome and proximal to the bladder.

3. The bolus delivery device of claim 1 , further comprising:

a biasing member disposed around the distal end of the piston,

wherein the activation dome is connected to the actuator and the proximal end of the piston such that operating the actuator displaces the piston to displace the seal member and initiate the flow of fluid from the reservoir to the bladder.

4. The bolus delivery device of claim 1 , wherein the housing defines ribs that limit the expansion of the bladder.

5. The bolus delivery device of claim 1 , wherein the bladder extends between a proximal connector and a distal connector, and wherein the inlet conduit is in fluid communication with the distal connector and the outlet conduit is in fluid communication with the distal connector.

6. The bolus delivery device of claim 1 , further comprising:

a stop that catches in a groove defined in the actuator to limit the distal movement of the actuator.

7. The bolus delivery device of claim 1 , wherein the actuator is operable by the patient to initiate a release of fluid from the bolus delivery device to the patient, and wherein the actuator is configured such that it requires minimal effort to force the fluid out of the bolus delivery device and that, when actuated by the patient, fluid is permitted to flow out of the bolus delivery device to the patient without further action by the patient.

8. The bolus delivery device of claim 1 , further comprising:

a removable tab that holds the actuator in a depressed position to self-prime the bolus delivery device.

9. The bolus delivery device of claim 3 , wherein the reservoir has a fluid pressure that varies as the volume of the fluid varies within the reservoir, and wherein the biasing member has a biasing force that overcomes the fluid pressure of the reservoir when the reservoir is substantially empty to push the seal member against the distal side of the reservoir seat.

10. The bolus delivery device of claim 3 , further comprising:

a collar disposed between the seal member and the biasing member.

11. The bolus delivery device of claim 5 , further comprising: an internal conduit extending from the distal connector to the reservoir, the

internal conduit providing fluid communication between the inlet conduit and the reservoir.

12. An infusion assembly, comprising:

an elastomeric pump configured to provide a fluid under pressure;

a continuous flow path in fluid communication with the pump for providing a continuous and substantially constant flow rate of fluid from the pump;

a bolus flow path for the delivery of a bolus dose of the fluid; and

a bolus delivery device in fluid communication with the bolus flow path and configured to receive fluid from the pump, the bolus delivery device including:

a housing,

a reservoir disposed within the housing for receipt of a volume of a fluid, the reservoir defined by an activation dome and a reservoir seat,

a piston axially disposed within the reservoir and extending through an orifice in the reservoir seat,

a seal member disposed around a distal end of the piston and against a distal end of the orifice of the reservoir seat, where the seal member is free to slide along the piston;

a bladder disposed in the housing, the bladder in fluid communication with the reservoir for receipt of the fluid from the reservoir,

an actuator operable by a patient,

an inlet conduit in fluid communication with the reservoir for providing the fluid to the reservoir, and

an outlet conduit in fluid communication with the bladder for providing the fluid to the patient,

wherein the actuator is in operative communication with the reservoir to initiate a flow of the fluid from the reservoir to the bladder, and

wherein the bladder expands as the bladder receives the fluid and contracts as the bladder dispenses the fluid.

13. The infusion assembly of claim 12 , wherein the pump provides the fluid under a pressure of up to about 30 psi.

14. The infusion assembly of claim 12 , wherein the pump provides the fluid under a pressure within a range of about 10 psi to about 30 psi.

15. The infusion assembly of claim 12 , wherein the pump provides the fluid under a pressure within a range of about 14 psi to about 25 psi.

16. A bolus delivery device, comprising:

a housing;

a reservoir disposed within the housing for receipt of a volume of a fluid, the reservoir defined by an activation dome and a reservoir seat;

a bladder disposed in the housing, the bladder in fluid communication with the reservoir for receipt of the fluid from the reservoir; and

a piston axially disposed within the reservoir, the piston having a proximal end and a distal end; and

a seal member disposed around the distal end of the piston and against a distal side of an orifice in the reservoir seat, where the seal member is free to slide along the piston,

wherein the activation dome is connected to the proximal end of the piston such that displacement of the piston initiates a flow of the fluid from the reservoir to the bladder.

17. The infusion assembly of claim 16 , wherein the housing defines ribs that limit the expansion of the bladder.

18. The infusion assembly of claim 16 , further comprising:

an inlet conduit in fluid communication with the reservoir for providing the fluid to the reservoir;

an outlet conduit in fluid communication with the bladder for providing the fluid to a patient;

a proximal connector; a distal connector; and

an internal conduit extending from the distal connector to the reservoir, wherein the bladder extends from the proximal connector to the distal connector,

wherein the inlet conduit is in fluid communication with the distal connector and the outlet conduit is in fluid communication with the distal connector, and

wherein the internal conduit provides fluid communication between the inlet conduit and the reservoir.

19. A bolus delivery device, comprising:

a housing;

a reservoir disposed within the housing for receipt of a volume of a fluid, the reservoir defined by an activation dome and a reservoir seat;

a piston axially disposed within the reservoir and extending through an orifice in the reservoir seat,

a seal member disposed around a distal end of the piston and against a distal end of the orifice of the reservoir seat;

a biasing member disposed around the distal end of the piston;

a bladder disposed in the housing, the bladder in fluid communication with the reservoir for receipt of the fluid from the reservoir;

an actuator;

an inlet conduit in fluid communication with the reservoir for providing the fluid to the reservoir, and an outlet conduit in fluid communication with the bladder for providing the fluid to a patient,

wherein the actuator is in operative communication with the reservoir to initiate a flow of the fluid from the reservoir to the bladder, and

wherein the bladder expands as the bladder receives the fluid and contracts as the bladder dispenses the fluid, and

wherein the reservoir has a fluid pressure that varies as the volume of the fluid varies within the reservoir, and wherein the biasing member has a biasing force that overcomes the fluid pressure of the reservoir when the reservoir is substantially empty to push the seal member against the distal side of the reservoir seat.