Infusion device capable of providing multiple liquid medicaments
A disposable infusion device comprises a base arranged to adhere to a patient's skin and a cannula arranged to extend from the base to beneath the patient's skin to deliver a liquid medicament to the patient. The device further includes a first source arranged to provide the cannula with a first liquid medicament and a second source arranged to provide the cannula with a second liquid medicament.
1 . A disposable infusion device comprising:
a base arranged to adhere to a patient's skin;
a cannula arranged to extend from the base to beneath the patient's skin to deliver a liquid medicament to the patient;
a first source arranged to provide the cannula with a first liquid medicament; and
a second source arranged to provide the cannula with a second liquid medicament.
2 . The device of claim 1 , wherein one of the first and second sources is arranged to provide its liquid medicament in fixed volume increments.
3 . The device of claim 2 , wherein the one of the first and second sources includes a reservoir for holding the liquid medicament and a fixed volume pump that delivers the liquid medicament to the cannula in the fixed volume increments.
4 . The device of claim 3 , wherein the fixed volume pump comprises a piston pump.
5 . The device of claim 3 , wherein the fixed volume pump comprises a dome pump.
6 . The device of claim 3 , wherein the fixed volume pump comprises a squeezable tube.
7 . The device of claim 1 , wherein one of the first and second sources comprises a reservoir.
8 . The device of claim 7 , wherein the first source comprises a reservoir and a pump and wherein the second source includes a port.
9 . The device of claim 8 , wherein the port is arranged to communicate with the cannula and to receive the second liquid medicament from an instrument external to the device.
10 . The device of claim 7 wherein the one of the first and second sources includes a pump communicating with the reservoir and arranged to deliver the liquid medicament to the cannula and a mechanical motor that drives the pump.
11 . The device of claim 10 , wherein the motor includes a wind-up spring.
12 . The device of claim 7 wherein the one of the first and second sources includes a pump and a fill port communicating with the reservoir to enable the reservoir to be filled by an instrument external to the device.
13 . The device of claim 7 , wherein the reservoir is formed of flexible material.
14 . The device of claim 1 , wherein the first source comprises a first reservoir, wherein the second source comprises a second reservoir, and wherein the device further includes a valve that selectively communicates the first reservoir with the cannula or the second reservoir with the cannula.
15 . The device of claim 1 , wherein the first source comprises a first reservoir arranged to hold the first liquid medicament and a first pump arranged to deliver the first liquid medicament to the cannula, and wherein the second source comprises a second reservoir arranged to hold the second liquid medicament and a second pump arranged to deliver the second liquid medicament to the cannula.
16 . The device of claim 1 , wherein one of the first and second sources is arranged to provide its associated liquid medicament at a substantially constant rate.
17 . The device of claim 16 , further comprising a rate adjuster that renders the substantially constant rate adjustable.
18 . The device of claim 1 , wherein one of the first and second sources includes a replaceable reservoir.
19 . A disposable infusion device comprising:
a base arranged to adhere to a patient's skin;
a cannula arranged to extend from the base to beneath the patient's skin to deliver a liquid medicament to the patient;
a first source arranged to provide the cannula with a first liquid medicament; and
a second source arranged to provide the cannula with a second liquid medicament,
wherein the first source is a reservoir and a pump that pumps the first liquid medicament from the reservoir to the cannula, and
wherein the second source is a port that receives the second liquid medicament form an instrument external to the device and conveys the second liquid medicament to the cannula.
20 . The device of claim 19 , wherein the pump is a fixed volume pump that delivers the liquid medicament to the cannula in fixed volume increments.
21 . The device of claim 20 , wherein the fixed volume pump comprises a piston pump.
22 . The device of claim 20 , wherein the fixed volume pump comprises a dome pump.
23 . The device of claim 20 , wherein the fixed volume pump comprises a squeezable tube.
24 . A disposable infusion device comprising:
a base arranged to adhere to a patient's skin;
a cannula arranged to extend from the base to beneath the patient's skin to deliver a liquid medicament to the patient;
a first source arranged to provide the cannula with a first liquid medicament;
a second source arranged to provide the cannula with a second liquid medicament,
wherein the first source is a first reservoir that holds the first liquid medicament,
wherein the second source is a second reservoir that holds the second liquid medicament; and
a pump that pumps the first and/or second liquid to the cannula.
25 . The device of claim 24 , wherein the pump is a single pump communicating with the cannula and wherein the device further includes a valve that selectively couple the first and second reservoirs to the pump.
26 . The device of claim 24 , wherein the pump comprises a first pump that pumps the first liquid medicament from the first reservoir to the cannula and a second pump that pumps the second liquid medicament from the second reservoir to the cannula, and wherein the device further includes a valve that selectively couples the first pump and the second pump to the cannula.