Limited flow rate drip chamber for intravenous fluid delivery system

• US 6,099,512 A
• Filed: 05/10/1999
• Issued: 08/08/2000
• Est. Priority Date: 05/10/1999
• Status: Expired due to Fees

• Current Assignee: Hector Urrutia
• Original Assignee: Hector Urrutia
• Inventors: Urrutia, Hector
• Primary Examiner(s): Coggins, Wynn Wood
• Assistant Examiner(s): MENDEZ, MANUEL A
• Application Number:
  US09/307,786
• Time in Patent Office: 456 Days
• Field of Search: 604/7, 604/27, 604/30, 604/122, 604/123, 604/246, 604/251, 604/252, 604/255, 604/322, 604/325, 604/403, 604/406, 128/760, 128/763, 128/765, 128/766
• US Class Current: 604/251
• CPC Class Codes: A61M 5/1411 Drip chambers A61M5/162, A61M5/1689, A61M5/40 take precedence
• CPC Class Codes: A61M 5/36 with means for eliminating or preventing injection or infusion of air into body dialysis systems, blood oxygenators A61M1/14; haemofiltration equipment A61M1/34; automatic tube cut-off A61M39/281

Abstract

A drip chamber for an intravenous fluid delivery system includes a housing having an inlet port and an outlet port, the inlet and outlet ports each having an inner diameter, and the housing defining a chamber between the inlet and outlet ports. The housing configured to channel intravenous fluid in a flow path from the inlet port through the chamber and to the outlet port. A member supported in the chamber between the inlet and outlet ports is positioned so that the intravenous fluid flowing through the chamber impinges against the member to reduce the velocity of the intravenous fluid and minimize formation of air bubbles in the intravenous fluid. The inner diameter of the inlet port being substantially equal to or greater than the inner diameter of the outlet port, such that a flow rate of the intravenous fluid exiting the outlet port is substantially equal to or less than a flow rate of the intravenous fluid entering the inlet port.

Claims

1. A limited flow rate drip chamber for an intravenous fluid delivery system, comprising:

a housing comprising an inlet port having an inner diameter and an outlet port having an inner diameter, and at least one side wall defining a chamber between the inlet and outlet ports, the housing configured to channel intravenous fluid in a flow path from the inlet port through the chamber to the outlet port; and

a member supported by the at least one side wall in the chamber between, and spaced from both, the inlet and outlet ports and positioned so that the intravenous fluid flowing into the chamber impinges against the member to reduce the velocity of the intravenous fluid and minimize formation of air bubbles in the intravenous fluid, the intravenous fluid impinging against the member flowing directly from the member to the outlet port,

wherein the inner diameter of the inlet port is not less than the inner diameter of the outlet port, such that a flow rate of the intravenous fluid exiting the outlet port is not greater than a flow rate of the intravenous fluid entering the inlet port.

2. The drip chamber of claim 1, wherein the housing includes first and second portions, the second portion being substantially flexible to permit compression of the housing.

3. The drip chamber of claim 2, wherein the first portion is substantially rigid.

4. The drip chamber of claim 2, wherein the member is positioned in the first portion of the housing.

5. The drip chamber of claim 2, wherein the member is positioned at the boundary between the first and second housing portions.

6. The drip chamber of claim 1, wherein the housing is substantially flexible to permit compression of the housing.

7. The drip chamber of claim 1, wherein the member is substantially rigid.

8. The drip chamber of claim 1, wherein the member is substantially flexible.

9. The drip chamber of claim 1, wherein the member is conically shaped with an apex facing the inlet port, the member having slots therein to permit the flow of intravenous fluid through the member.

10. The drip chamber of claim 1, wherein the member comprises a plate extending in a direction substantially perpendicular to the flow path.

11. The drip chamber of claim 1, wherein the member comprises a bar extending from opposite sides of the housing and in a direction substantially perpendicular to the flow path.

12. An intravenous fluid delivery system, comprising:

an intravenous fluid container;

a limited flow rate drip chamber including a cylindrical housing comprising an upper inlet port at one end of the housing and in flow communication with the intravenous fluid container, the upper inlet port having an inner diameter, and a lower outlet port at an opposite end of the housing, the lower outlet port having an inner diameter, the housing further comprising at least one side wall defining a chamber between the inlet and outlet ports, and configured to channel intravenous fluid in a flow path from the inlet port through the chamber to the outlet port, and a member supported by the at least one side wall in the chamber between, and spaced from both, the inlet and outlet ports and positioned in the flow path to disperse the intravenous fluid flowing from the inlet and thereby reduce the velocity of the intravenous fluid flowing toward the outlet port, the intravenous fluid impinging against the member flowing directly from the member to the outlet port; and

means, in flow communication with the outlet port of the drip chamber, for delivering the intravenous fluid to a patient,

wherein the inner diameter of the inlet port is not less than the inner diameter of the outlet port, such that a flow rate of the intravenous fluid exiting the outlet port is not greater than a flow rate of the intravenous fluid entering the inlet port.

13. The system of claim 12, wherein the housing includes upper and lower portions, the lower portion being substantially flexible to permit compression of the housing walls.

14. The system of claim 13, wherein the upper portion is substantially rigid.

15. The system of claim 13, wherein the member is positioned in the upper portion of the housing.

16. The system of claim 13, wherein the member is positioned at the boundary between the upper and lower portions.

17. The system of claim 12, wherein the housing is substantially flexible to permit compression of the housing.

18. The system of claim 12, wherein the member is substantially rigid.

19. The system of claim 12, wherein the member is substantially flexible.

20. The system of claim 12, wherein the member is conically shaped with an apex facing toward the inlet port, the member having slots therein to permit the flow of fluid through the member.

21. The system of claim 12, wherein the member comprises a plate extending in a direction substantially perpendicular to the flow path.

22. The system of claim 12, wherein the member comprises a bar extending from opposite sides of the housing and in a direction substantially perpendicular to the flow path.

23. The system of claim 12, wherein the member is configured to direct the intravenous fluid against a side wall of the housing.

24. A limited flow rate drip chamber for an intravenous fluid delivery system, comprising:

a housing comprising an inlet port and an outlet port, the inlet and outlet ports each having an inner diameter, and at least one side wall defining a chamber between the inlet and outlet ports, the housing configured to channel intravenous fluid in a flow path from the inlet port through the chamber to the outlet port; and

a bar supported at least one end by the at least one side wall in the chamber and spaced from both the inlet and outlet ports so that the intravenous fluid flowing into the chamber impinges against the member to reduce the velocity of the intravenous fluid and minimize formation of air bubbles in the intravenous fluid,

wherein the inner diameter of the inlet port is not less than the inner diameter of the outlet port, such that a flow rate of the intravenous fluid exiting the outlet port is not greater than a flow rate of the intravenous fluid entering the inlet port.

25. A limited flow rate drip chamber for an intravenous fluid delivery system, comprising:

a housing having an inlet port and an outlet port, the inlet and outlet ports each having an inner diameter, and the housing defining a chamber between the inlet and outlet ports, the housing configured to channel intravenous fluid in a flow path from the inlet port through the chamber to the outlet port; and

a conically-shaped member supported in the chamber between the inlet and outlet ports and having an apex facing the inlet port, the member positioned so that the intravenous fluid flowing into the chamber impinges against the member to reduce the velocity of the intravenous fluid and minimize formation of air bubbles in the intravenous fluid, the member comprising slots extending radially from a position proximate the apex toward a periphery of the member to permit fluid to pass through the member after impingement,

wherein the inner diameter of the inlet port is not less than the inner diameter of the outlet port, such that a flow rate of the intravenous fluid exiting the outlet port is not greater than a flow rate of the intravenous fluid entering the inlet port.