Device for the intentional and controllable distribution of a liquid or viscous material

• US 5,741,275 A
• Filed: 02/14/1994
• Issued: 04/21/1998
• Est. Priority Date: 06/15/1992
• Status: Expired due to Term

• Current Assignee: Wyssmann, Max
• Original Assignee: Wyssmann, Max
• Inventors: Wyssmann, Max
• Primary Examiner(s): Manahan, Todd E.
• Application Number:
  US08/196,074
• Time in Patent Office: 1,527 Days
• Field of Search: 604/131, 604/132, 604/140, 604/141, 604/143, 604/145, 222/389, 222/386.5
• US Class Current: 604/143
• CPC Class Codes: A61M 2005/14204 with gas-producing electrochemical cell
• CPC Class Codes: A61M 5/14526 the piston being actuated by fluid pressure
• CPC Class Codes: A61M 5/155 pressurised by gas introduced into the reservoir
• CPC Class Codes: F16N 11/10 by pressure of another fluid

Abstract

A device for controllably dispensing a liquid or viscous material comprises a chamber which is subdivided by a piston into a pressurized gas chamber and a mass chamber. The container includes electrochemical, tablet-shaped, completely enclosed diffusion electrodes, aqueous electrolytes, a gas development cell containing a counter-electrode, an adjusting rheostat and contacts held by a clamping device in the bottom of the container. A vibration-dampening funnel-shaped container cap encloses the top end of the container and is totally compliant and shock-proof. The piston includes a piston seal which has a sealing lip monolithically connected to the piston with a space for a film of grease. An alternative embodiment has exchangeable electric elements and a refilling device. Other alternative embodiments have a simplified compact design for small sizes or for infusion devices or are associated with piston sensors.

Claims

1. A device for selective, controllable release of a fluid, a viscous mass or a suspension of solid particles in a fluid, comprising:

a cylindrical container;

a top enclosing a first end of the container, in combination with a funnel-shaped container seal;

a bottom enclosing a second end of the container opposite to the first end, wherein the bottom includes a clamping device for receiving electrical components, the electrical components including an electrochemical gas evolution cell, an adjustable load resistor and electrical contacts which combine to develop an external current circuit, wherein the gas evolution cell has a tablet-shaped construction including a metal enclosure receiving a gas diffusion electrode, a counter electrode and an aqueous electrolyte, and wherein the external current circuit is connected with the gas evolution cell to activate the gas evolution cell; and

a cylindrical piston slidingly received within the container and dividing the container into a pressurized gas chamber and a mass chamber, wherein the funnel-shaped container seal faces the mass chamber of the container, and wherein the piston includes a circumference provided with an annular seal and a coupled pair of coaxial plugs for causing telescoping movement of the piston

2. The device of claim 1 wherein the top further includes a screw connector.

3. The device of claim 1 wherein the top further includes a plug connector.

4. The device of claim 1 wherein the bottom and the container form a monolithic structure.

5. The device of claim 1 wherein the bottom and the container are joined by a screw connector.

6. The device of claim 1 wherein the bottom and the container are joined by a plug connector.

7. The device of claim 1 wherein portions of the piston facing the pressurized gas chamber are provided with a protruding ring-shaped sealing lip, defining a space for receiving a grease film, and wherein central portions of the piston include a pot-like recess for reducing the pressurized gas chamber to a minimum size.

8. The device of claim 7 wherein the container seal is formed as a funnel-shaped, elastic, corrugated sealing cover having a threaded nipple.

9. The device of claim 8 wherein the external current circuit includes two gas evolution cells which, together with the resistor, are held by the clamping device directly to the bottom of the container.

10. The device of claim 9 wherein the bottom of the container further includes a marking arrow, forming an adjusting scale.

11. The device of claim 10 which further includes a rotating, plug-shaped component having a pipe-like neck with a profiled peg for slidingly engaging an opening in a rotary potentiometer.

12. The device of claim 11 which further includes an O-ring for sealing the plug-shaped component to the bottom of the container.

13. The device of claim 11 wherein the bottom of the container further includes an adjusting scale.

14. The device of claim 1 wherein portions of the piston facing the pressurized gas chamber are provided with a chamber for receiving a protruding annular sealing lip for developing a film of grease, and wherein central portions of the piston include a pot-like recess for reducing the pressurized gas chamber to a minimum size.

15. The device of claim 14 wherein the container seal is formed as a funnel-shaped, elastic, corrugated sealing cover having a threaded nipple.

16. The device of claim 15 wherein the external current circuit includes two gas evolution cells which, together with the resistor, are held by the clamping device directly to the bottom of the container.

17. The device of claim 16 wherein the bottom of the container further includes a marking arrow, forming an adjusting scale.

18. The device of claim 17 wherein the bottom of the container includes a plurality of chambers exchangeably and replaceably receiving the electrical components of the clamping device.

19. The device of claim 18 wherein central portions of the bottom of the container include two rotationally symmetrical, coaxially connected components, each having a disk-shaped flange with a neck, a groove which is limited by a stop and cams, and snap-fit gripping means for mutually fixing and holding the gas evolution cells.

20. The device of claim 19 which further includes a rotary potentiometer, and wherein at least one of the rotationally symmetrical components includes a profiled peg for slidingly engaging an opening in the rotary potentiometer.

21. The device of claim 20 wherein one of the rotationally symmetrical components is an inner plug-shaped component provided with a clamping device having inwardly directed resilient tongues for holding gas evolution cells and the rotary potentiometer, and wherein the plug-shaped component further includes a disk-like flange with a peripheral cam for engaging a groove with a stop associated with the bottom of the container, and a threaded pipe-like neck for engaging a correspondingly threaded central opening in the bottom of the container.

22. The device of claim 21 wherein another of the rotationally symmetrical components is an outer plug-shaped component having a marking arrow forming an adjusting scale, and a pipe-like, radially flexible, snap-fit closure for engaging the inner plug-shaped component.

23. The device of claim 22 which further includes a sealing O-ring positioned between the bottom of the container, through a circular depression, and the inner plug-shaped component, and between the bottom of the container, through a depression, and the outer plug-shaped component.

24. The device of claim 23 which further includes a refilling device formed as a folding bellows-like cartridge with internal threads for attachment to the device.

25. The device of claim 1 wherein the bottom of the container is divided, and receives an outer pot-like component including a scale and having threads for engaging the second end of the container, and wherein O-rings seal the outer pot-like component against the container.

26. The device of claim 25 which further includes radially inwardly and axially outwardly acting, centrally-symmetrically arranged leaf spring retainers having snap-in bulges for clamping a single gas evolution cell to an axially arranged contact with a radial contact tongue, and an inner rotationally symmetrical component pressed into an outer component and including a marking arrow forming a scale, wherein the rotationally symmetrical component includes a circular, ring-shaped adjusting resistor connected with a central contact.

27. The device of claim 1 wherein the container is a graduated vessel of an infusion syringe, and wherein one of the plugs of the piston is threaded to receive an activation rod for infusing a medium.

28. The device of claim 27 wherein the plugs are separated by an internally locking snap-in ring.

29. The device of claim 28 wherein the plugs include an outwardly-lying, rotationally symmetrical sleeve and an inwardly-lying, rotationally symmetrical, hollow-pressed sealing plug.

30. The device of claim 29 wherein the container includes a stop bulge formed on inner portions of the container, for limiting withdrawal of the sleeve from the container.

31. The device of claim 30 wherein the sleeve includes a stop ring for engaging a flange formed on the container, for limiting movement of the sleeve into the container.

32. The device of claim 31 wherein the sealing plug includes an air evacuation opening for releasing an overpressure from the pressurized gas chamber responsive to telescoping of the sealing plug relative to the sleeve.

33. The device of claim 27 which includes a single gas evolution cell, an axially positioned, fixed electrical rod resistor, and spring contacts formed of curved bands.

34. The device of claim 1 wherein the container is a graduated vessel of an infusion syringe, wherein the bottom of the container has an outwardly projecting conical shoulder and an inwardly projecting bulge, and wherein the bottom of the container includes a single, rotationally symmetrical elastic cap forming a closure lid with an inner, resilient sealing lip.

35. The device of claim 34 which further includes an inner, conical recess which engages the conical shoulder of the container, radially inwardly and axially outwardly acting, centrally symmetrical leaf spring retainers for holding the single gas evolution cell, and axially positioned guide ribs forming strap-shaped contacts.

36. The device of claim 35 which includes a single, axially mounted gas evolution cell, an axially positioned, fixed electrical rod resistor, and resilient contacts formed as curved bands with a double S-shape.

37. The device of claim 1 wherein the container is enclosed by a seal and is firmly mechanically connected with a path-measuring device including a U-shaped housing, an axial stop contact, a radial contact between the gas evolution cell and the housing, clamp jaws, a linear coil, push buttons and an indicator, which are mechanically connected by the clamp jaws and the stop contact, and which are electrically connected by the electrical contacts, and wherein the interior of the piston includes a permanent magnet for acting on the coil.