Reconstituting infusion device
A system and method for a patch-like, self-contained multi-component substance infusion device which provides one or more substantially hidden patient needles which can be placed in fluid communication with a fluid reservoir assembly that includes a rigid bladder portion used in conjunction with a non-distensible bladder film, such as a metallized film. The device can be attached to a skin surface via an adhesive contact and a pressurization system provides a pressure to the contents of a fluid reservoir assembly. Improvements to dry powdered formulations for reconstitution for preferred use in the device are also disclosed.
1. A method for preparing a medicament prior to delivery into the body of a patient by injection into or through the skin of a patient, comprising:
providing a first reservoir having a flexible, non-distensible membrane, the first reservoir containing a substance at a predetermined pressure;
providing a needle in selective communication to said first reservoir;
providing a second reservoir having a chamber with at least one movable wall, said chamber containing a fluid, said chamber having a pressure greater than said predetermined pressure;
causing fluid communication to occur between said chamber and said first reservoir whereby said fluid communication allows said fluid to flow between said first reservoir and said chamber and co-mingling of said fluid and said substance to form said medicament;
moving said at least one movable wall of said chamber whereby said moving forces said medicament to flow from said chamber into said first reservoir, whereby said medicament is prepared for injection;
delaying pressurization of said first reservoir until substantially all of said medicament has been forced into said first reservoir; and
pressurizing said first reservoir and infusing the medicament into the body of the patient through the needle from said first reservoir.
2. A method according to claim 1 wherein said predetermined pressure is greater than 2000 mT of vacuum.
3. A method according to claim 1 wherein said substance is a lyophilized powder.
4. A method according to claim 1 wherein said substance is a spray freeze-dried powder.
5. A method according to claim 1 wherein said substance is a liposome.
6. A method according to claim 1 wherein said substance is a substantially dry powder.
7. A method according to claim 1 wherein said co-mingling of said liquid and said substance to form said medicament occurs in an atmosphere substantially comprised of an inert gas.
8. The method according to claim 1 , wherein said predetermined pressure is less than atmospheric pressure.
9. A method according to claim 8 wherein said substance is a lyophilized powder.
10. A method according to claim 8 wherein said substance is a spray freeze-dried powder.
11. A method according to claim 8 wherein said substance is a liposome.
12. A method according to claim 8 wherein said substance is a substantially dry powder.
13. A method for preparing a medicament prior to delivery into the body of a patient by injection into or through the skin of a patient, comprising:
providing a first reservoir having a flexible, non-distensible membrane, the first reservoir containing a liquid at a predetermined pressure;
providing a needle in selective communication to said first reservoir;
providing a second reservoir having a chamber with at least one movable wall, said chamber containing a substance, said chamber having a pressure less than said predetermined pressure;
causing fluid communication to occur between said chamber and said first reservoir whereby said fluid communication allows said liquid to flow between said first reservoir and said chamber and co-mingling of said liquid and said substance to form said medicament;
moving said at least one movable wall of said chamber whereby said moving forces said medicament to flow from said chamber into said first reservoir, whereby said medicament is prepared for injection;
delaying pressurization of said first reservoir until substantially all of said medicament has been forced into said first reservoir; and
pressurizing said first reservoir and infusing the medicament into the body of the patient through the needle from said first reservoir.