Fluid collection system

• US 5,466,229 A
• Filed: 08/06/1993
• Issued: 11/14/1995
• Est. Priority Date: 08/06/1993
• Status: Expired due to Fees

• Current Assignee: David H. Kuntz
• Original Assignee: Davstar, Inc.
• Inventors: Kuntz, David H., Elson, Edward E.
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): ZUTTARELLI, ANTHONY
• Application Number:
  US08/103,444
• Time in Patent Office: 830 Days
• Field of Search: 417/4, 417/36-40, 137/587-588, 137/205, 604/317-324, 604/326, 604/30-31, 604/35, 604/905, 604/256-257, 604/259-260, 604/313, 604/315, 128/912, 13/319, 13/326, 13/357, 210/85, 210/86, 210/91, 210/97, 210/104, 210/252, 210/257.2, 210/258, 210/744
• US Class Current: 604/317
• CPC Class Codes: A61M 1/71 Suction drainage systems containers therefor A61M1/60, A61M1/64; negative pressure wound therapy systems A61M1/90
• CPC Class Codes: A61M 1/72 Cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 1/78 Means for preventing overflow or contamination of the pumping systems combined with drainage containers A61M1/60
• CPC Class Codes: A61M 1/782 using valves with freely moving parts, e.g. float valves
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/215 Tilt detection, e.g. for warning or shut-off
• CPC Class Codes: A61M 2205/8206 battery-operated

Abstract

A fluid collection apparatus for the controlled collection of body fluids comprising a collection vessel housed in a carrier, a vacuum pump mounted in the carrier, and means for powering pump for continuous operation mounted therein. The collection vessel includes a valved exit port, and inlet port connected to a body mounted fluid collection apparatus, a vacuum control means, liquid level control means an tilt sensing means all operatively connected. Also described are a vented drainage valve assembly, and sound and odor absorbing components.

Claims

1. A fluid collection apparatus for removing liquid from a collection pad attached to a living body, the fluid collection apparatus comprising:

a carrier having a collection vessel removably mounted thereon, a vacuum pump mounted in the carrier, and means for powering the vacuum pump for continuous operation mounted thereto,

a) the collection vessel being a container having an internal space for collection of fluid, the collection vessel having

i) an inlet port in a first upper portion of the collection vessel, said inlet port being sealed by a removable attached inlet connector having a flow channel therethrough, said inlet connector containing a one way valve which prevents fluid in the vessel from passing through the inlet connector, and

ii) a sealable drainage port located in a surface of the vessel,

b) the vacuum pump having an inlet port connected by a tubular conduit to a vacuum port located in a second upper portion of the vessel so that operation of the vacuum pump creates a vacuum characterized as a pressure within the vessel which is less than ambient pressure, and

c) a gas pervious but liquid impervious material interposed between the vessel interior and the pump inlet to prevent liquid in the vessel from exiting the vessel through the tubular conduit,

the carrier further including a level sensing switch operatively connected to the vacuum pump, the switch functioning to shut off the pump if the vessel is tilted beyond a preset angle from its normal resting orientation,

the fluid collection apparatus being operatively connected to a collection pad by a drain tube having a first end attached to the pad and a second end attached to the inlet connector so that the vacuum in the vessel will cause liquid to flow from the pad through the drain tube and be deposited in the vessel.

2. The fluid collection apparatus of claim 1 wherein the carrier further includes a vacuum sensing switch operatively connected to the vacuum pump, the vacuum switch functioning to shut off the pump if the vacuum in the fluid collection system exceeds a preset value and to turn on the pump if the vacuum in the fluid collection system drops below a pre-set value.

3. The fluid collection apparatus of claim 1 further including a control port in a third upper portion of the vessel, said control port being removably sealed by a control connector, the control connector including a liquid level sensing switch, said liquid level sensing switch functioning to suspend operation of the vacuum pump when a predetermined amount of liquid is contained in the vessel.

4. The fluid collection apparatus of claim 1 wherein the pump is at least partially held and surrounded by a boot, the boot having at least two elastic suspenders attached thereto, the suspenders positioning the pump within the carrier without the pump contacting the carrier.

5. The fluid collection apparatus of claim 1 wherein the vacuum pump has an exit side connected to a noise muffler, said noise muffler comprising a tube having an inlet end and an outlet end, first energy absorbing baffles located in the inlet end, second energy absorbing baffles located in the outlet end, and third energy absorbing baffles located within the tubular conduit between the first energy absorbing baffles and the second energy absorbing baffles, a hollow inlet conduit passing through both the first energy absorbing baffles and the third energy absorbing baffles, a hollow outlet conduit passing through both the second energy absorbing baffles and the third energy absorbing baffles and a hollow internal conduit passing through the third energy absorbing baffles such that a gas stream feed into the first hollow conduit at a point exterior to the inlet end of tube will pass serially through the hollow inlet, a first internal portion of the tube, the internal conduit, a second internal portion of the tube, and the exit conduit and exit the outlet end of the tube.

6. The fluid collection apparatus of claim 1 wherein air evacuated from the collection vessel passes through the vacuum pump and is fed through a sound muffler of fixed length to a noise and odor absorbent material, said muffler being divided into chambers by energy absorbing baffles, the air flowing in a non-linear path through the muffler, the length of the path of airflow, through the muffler being greater than the length of the muffler.

7. The fluid collection apparatus of claim 1 wherein the carrier has attached thereto a cover which can be moved from a closed position to an open position to allow removal of the collection vessel, the cover including a locking mechanism to prevent accidental removal of the collection vessel compromising a tab mounted on the frame, said tab extending through an opening in the cover when the cover is in its closed position and a structure substantially enclosed within the cover, the structure having a trigger extending through the cover, a finger which interlocks with an extension attached to the carrier and a raised portion which contacts the tab, said raised portion holding the tab in the opening in the cover while such contact is maintained, such that the cover cannot be moved to its open position unless the finger is withdrawn from its interlocking position with the extension and the raised portion is removed from contact with the tab by depressing the trigger and simultaneously moving the tab from its position within the opening in the frame by applying an external force to the tab.

8. The fluid collection apparatus of claim 1 further having a motor positioned to drive the pump, the motor at least partly surrounded by a collar, the collar having at least two elastic suspenders positioning the motor within the carrier without the motor contacting the carrier.

9. The fluid collection apparatus of claim 1 wherein the vacuum pump is driven by an electric motor and the system further includes a vacuum sensor operatively connected to a control means, the vacuum sensor set to detect the vacuum in the system and send a control signal to the control means such that when the vacuum in the system increases above a preset level, the control module causes an increase in the current being delivered to the motor and when the vacuum in the system decreases below a preset level the control module causes a decrease in the current being delivered to the motor.

10. The fluid collection apparatus of claim 1 wherein the gas pervious but liquid impervious material is a non-wettable filter medium held in the vacuum port above the vessel interior, said vacuum port further including a float having means cooperating therewith to interrupt the imposition of vacuum on the vessel interior if the amount of liquid exceeds a predetermined quantity.

11. The fluid collection apparatus of claims 10 wherein the liquid impervious material has a pore size less than about 0.8 microns.

12. The fluid collection apparatus of claim 10 wherein said vacuum port includes a tubular portion depending therefrom to direct air evacuated from the vessel through the filter media, said tubular portion also functioning as a baffle to prevent direct liquid contact with the filter medium, said tubular portion has a lower edge and when liquid in the chamber exceeds a desired level the float moves the gasket into sealing contact with the lower edge of the tubular portion, interrupting the flow of any of the contents of the vessel through the vacuum port.

13. The fluid collection apparatus of claim 1 wherein the sealable drainage port includes a vented drain valve which allows ambient air to pass through the valve to a liquid free space within the collection vessel, the ambient air passing counter-current to fluid exiting through the valve without contacting said exiting fluid.

14. The fluid collection apparatus of claim 13 wherein the vented drain valve comprises

a shell having a wall surrounding a lumen extending therethrough, a piston located within and slidable along at least a portion of the lumen in the shell and a hollow spout depending from the shell wherein,

the lumen in the shell extends from a first end of the shell to a second end of the shell, the lumen having a uniform cross-section along its length,

the piston located in the lumen in the shell has cross-sectional dimensions smaller than the dimensions of the cross-section of the lumen in the shell, and

at least a first and a second seal are located between the piston and the shell, the seals being spaced apart such that a fluid will not pass along the length of the piston between the piston and the shell,

the shell wall having a drain opening at a point between the first end of the shell and the second end of the shell, the opening connecting the shell lumen to the hollow through the spout,

the piston having a wall surrounding a passage, the passage extending from an interior end of the piston to a channel piercing the wall of the piston at a point spaced from the interior end of the piston, the first seal circumferentially encircling the piston at a point near the interior end of the piston, and the second seal circumferentially encircling the piston at a point located between the interior end of the piston and the channel through the wall of the piston, such that the first seal and the second seal are both in sealing contact between the piston and the wall of the shell,

a hollow tube having a lumen extending therethrough, a first end of the tube being attached to the interior end of the piston so that the lumen of the tube is coextensive with the passage in the piston and extends into the liquid free space within the collection vessel,

the seals being located such that when the piston is located within the shell in a first position the first seal is located on a first side of the drain opening through the wall of the shell and the second seal is located on a second side of the drain opening through the wall of the shell, and when the piston is located in the shell in a second position, the second seal is located on the second side of the drain opening, but the entire drain opening is no longer located between the first seal and the second seal.

15. The fluid collection apparatus of claim 14 further including a third seal located between the piston and the shell such that when the piston is in the first position, the third seal is in sealing contact with the shell wall and the channel is isolated from the air surrounding the valve and when the piston is in the second position the third seal no longer isolates the channel from the air surrounding the valve.

16. The fluid collection apparatus of claim 14 wherein the first seal and second seal encircling the piston are formed as an integral part of the piston.

17. The fluid collection apparatus of claim 14 wherein the first seal and second seal are rings of a sealing material interposed between the shell and the piston.

18. The fluid collection apparatus of claim 17 further having a motor positioned to drive the pump, the motor at least partly surrounded by a collar, the collar having at least two elastic suspenders positioning the motor within the frame without the motor contacting the frame.