Claims
- 1. A piston pumping system comprising a piston guided within a guide tube and capable of performing a stroke movement along its longitudinal axis, opening into a pumping chamber, the pumping chamber being connected via a liquid-conveying connection with valve to a storage vessel and from the pumping chamber a liquid conveying connection leads to a device for delivering the liquid, wherein the guide tube is formed an O-ring seal held by a groove which seals off the piston, has a gas permeation coefficient of 100 to 500 N*cm3*mm/(m2*h*bar)] for nitrogen (N2) and a radial compression of less than 30% and the seal fills the groove with a groove filling level of more than 90%.
- 2. A piston pumping system according to claim 1, wherein the groove filling level is more than 95%.
- 3. A piston pumping system according to claim 1, wherein the valve is a non-return valve.
- 4. A piston pumping system according to claim 1, wherein a non-return valve is formed in the connection to a device for delivering the liquid.
- 5. A piston pumping system according to claim 1, wherein the piston has a cross section of 0.25 to 4 mm.
- 6. A piston pumping system according to claim 1, wherein the piston has a length of 5 mm to 10 cm.
- 7. A piston pumping system according to claim 1, wherein the stroke movement of the piston along its longitudinal axis covers a length from up to 1 mm to 5 cm.
- 8. A piston pumping system according to claim 1, wherein the O-ring seal consists of silicon.
- 9. A piston pumping system according to claim 1, wherein the piston is a hollow piston in which the liquid-conveying connection with a valve which connects the pumping chamber to a storage vessel is integrated.
- 10. A piston pumping system according to claim 1, wherein the movement of the piston is mechanically controlled.
- 11. A piston pumping system according to claim 10, wherein the piston is moved by means of a helical spring.
- 12. A piston pumping system according to claim 1, wherein the movement of the piston is electronically controlled.
- 13. A piston pumping system according to claim 12, wherein the piston is controlled by means of a microchip.
- 14. A piston pumping system according to claim 12, wherein the piston is moved by means of a piezoelectric element.
- 15. A piston pumping system according to claim 1, wherein the pump volume is from 1 microlitre to 1 ml.
- 16. A piston pumping system according to claim 1, wherein the device for delivering the liquid is at least one nozzle, at least one micro-pin or at least one microcutter along which the liquid is guided, at least canulas and/or at least one outlet.
- 17. A piston pumping system according to claim 1, wherein the cord thickness of the O-ring is from 0.3 to 3 mm.
- 18. A medical device for delivering pharmaceutical liquids comprising a piston pumping system comprising a piston guided within a guide tube and capable of performing a stroke movement along its longitudinal axis, opening into a pumping chamber, the pumping chamber being connected via a liquid-conveying connection with valve to a storage vessel and from the pumping chamber a liquid conveying connection leads to a device for delivering the liquid, wherein the guide tube is formed an O-ring seal held by a groove which seals off the piston, has a gas permeation coefficient of 100 to 500 N*cm3*mm/(m2*h*bar)] for nitrogen (N2) and a radial compression of less than 30% and the seal fills the groove with a groove filling level of more than 90%.
- 19. A medical device according to claim 18, wherein the medical device is a transdermal therapeutic system which comprises in addition to the piston pumping system a storage vessel consisting of at least one moveable element or having a venting opening and at least one micro-pin or microcutter.
- 20. A medical device according to claim 18, wherein the medical device is an atomiser for liquids, a nasal spray, an eye spray or an inhaler
Priority Claims (1)
Number |
Date |
Country |
Kind |
02027243 |
Dec 2002 |
EP |
|
RELATED APPLICATIONS
[0001] Benefit of U.S. Provisional Application No. 60/431,640, filed Dec. 6, 2002 is herby claimed.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60431640 |
Dec 2002 |
US |