Fluid gas removal drip chamber

• US 5,779,674 A
• Filed: 05/06/1996
• Issued: 07/14/1998
• Est. Priority Date: 05/06/1996
• Status: Expired due to Term

• Current Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Original Assignee: Mallinckrodt Medical Inc. (Mallinckrodt plc)
• Inventors: Ford, Steven
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): Cho, David J.
• Application Number:
  US08/642,955
• Time in Patent Office: 799 Days
• Field of Search: 604/122, 604/126, 604/167, 604/251, 604/252, 604/254, 604/255, 604/403, 604/407, 604/80-85
• US Class Current: 604/126
• CPC Class Codes: A61M 5/38 using hydrophilic or hydrophobic filters

Abstract

A fluid gas removal drip chamber for use for parenteral administration of fluids is disclosed. The drip chamber has a hydrophobic barrier which extends into the interior of the drip chamber. The hydrophobic barrier preferably comprises at least a portion of a three-dimensional surface. In one embodiment, an inlet port allows fluid to enter the drip chamber from the top so that the fluid falls through an air space formed in the top of the drip chamber. By shaping the inlet port so that droplets of fluid are formed, a health care professional can monitor the fluid drip rate. In another embodiment, the hydrophobic barrier is configured so that little or no air space exists at the top of the drip chamber. The drip chamber includes means for venting air that is separated from the fluid within the chamber and, at the same time, preventing air from entering the chamber through the venting means. For certain applications, the drip chamber is provided with a hydrophilic filter for filtering the fluid prior to exiting the drip chamber.

Claims

1. A fluid gas removal chamber for parenteral administration of fluids, comprising:

a housing having an enclosed top end, and an outlet with an opening therethrough for discharge of fluid, said housing defining an interior chamber for receiving and collecting fluid;

means for delivering fluid to said chamber;

barrier means, disposed adjacent the top end and extending into said chamber, for establishing a vertically dimensioned hydrophobic barrier that will pass air from said chamber, without passing fluid; and

vent means, in fluid communication with said barrier means, for venting air passed through the hydrophobic barrier of said barrier means.

2. The fluid gas removal chamber as recited in claim 1 wherein the barrier means comprises an elongate hydrophobic membrane, the elongate hydrophobic membrane comprising at least a portion of a three-dimensional surface.

3. The fluid gas removal chamber as recited in claim 2 wherein the barrier means further comprises means for supporting the hydrophobic membrane against collapse.

4. The fluid gas removal chamber as recited in claim 1, wherein the vent means further comprises means, in fluid communication with the vent means, for preventing air from entering the chamber through the vent means.

5. The fluid gas removal chamber as recited in claim 1 wherein the barrier means is disposed sufficiently below the top end such that in use, a void head space is formed which enables the monitoring of delivered fluid droplets.

6. The fluid gas removal chamber as recited in claim 5 wherein the means for delivering fluid to the chamber comprises a nozzle capable of forming the delivered fluid into droplets.

7. The fluid gas removal chamber as recited in claim 1 wherein the barrier means is disposed close to the top end such that in use, little or no void head space is formed between the top end and the delivered fluid.

8. The fluid gas removal chamber as recited in claim 1 further comprising means, disposed between the outlet and the means for delivering fluid, for filtering the fluid prior to passage through the outlet.

9. The fluid gas removal chamber as recited in claim 8 wherein the means for filtering the fluid comprises a hydrophilic barrier.

10. A fluid gas removal chamber for parenteral administration of fluids, comprising:

a housing having an enclosed top end, and an outlet with an opening therethrough for discharge of fluid, said housing defining an interior chamber for receiving and collecting fluid;

means for delivering fluid to said chamber;

barrier means, disposed adjacent the top end and extending into said chamber, for establishing an elongate hydrophobic barrier that will pass air from said chamber, without passing fluid;

vent means, in fluid communication with said barrier means, for venting air passed through the hydrophobic barrier of said barrier means; and

means, in fluid communication with the vent means, for preventing air from entering the chamber through the vent means.

11. The fluid gas removal chamber as recited in claim 10 wherein the barrier means comprises means for supporting the elongate hydrophobic barrier against collapse.

12. The fluid gas removal chamber as recited in claim 10 wherein the barrier means is disposed sufficiently below the top end such that in use, a void head space is formed which enables the monitoring of delivered fluid droplets.

13. The fluid gas removal chamber as recited in claim 12 wherein the means for delivering fluid is constructed so as to be capable of forming the delivered fluid into droplets.

14. The fluid gas removal chamber as recited in claim 10 wherein the barrier means is disposed close to the top end such that in use, little or no void head space is formed between the top end and the delivered fluid.

15. The fluid gas removal chamber as recited in claim 10 comprising a cap which encloses the top end of the housing.

16. The fluid gas removal chamber as recited in claim 15 wherein the means for delivering fluid comprises a first passageway extending through the cap into the chamber.

17. The fluid gas removal chamber as recited in claim 16 wherein the vent means comprises a second passageway extending through the cap into the chamber.

18. The fluid gas removal chamber as recited in claim 17 comprising means, disposed between the outlet and the means for delivering fluid, for filtering the fluid prior to passage through the outlet.

19. The fluid gas removal chamber as recited in claim 18 wherein the means for filtering the fluid comprises a hydrophilic membrane.

20. The fluid gas removal chamber as recited in claim 19 wherein the hydrophilic membrane comprises at least a portion of a three-dimensional surface.

21. A fluid gas removal chamber for parenteral administration of fluids, comprising:

a housing having an enclosed top end, and an outlet with an opening therethrough for discharge of fluid, said housing defining an interior chamber for receiving and collecting fluid;

a cap enclosing the top end of the housing and having a first passageway and a second passageway formed therethrough;

means for delivering fluid to said chamber through the first passageway formed in the cap;

barrier means, in fluid communication with the second passageway formed in the cap and extending into said chamber, for establishing an elongate hydrophobic barrier that will pass air from said chamber, without passing fluid;

vent means, in fluid communication with said barrier means, for venting air passed through the hydrophobic barrier of said barrier means; and

means, in fluid communication with the barrier means, for preventing air from entering the chamber through the vent means.

22. The fluid gas removal chamber as recited in claim 21 comprising means, disposed between the outlet and the means for delivering fluid, for preventing the passage of air through the outlet once fluid covers said means for preventing the passage of air.