Medical and biological fluid collection and disposal system

• US 5,741,238 A
• Filed: 03/02/1995
• Issued: 04/21/1998
• Est. Priority Date: 03/02/1995
• Status: Expired due to Fees

• Current Assignee: Steris Corporation
• Original Assignee: Steris Corporation
• Inventors: Bradbury, John R., Terry, Richard L., Spangler, Clayton W.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): O YONG, KI
• Application Number:
  US08/398,161
• Time in Patent Office: 1,146 Days
• Field of Search: 604/314-326, 604/905, 604/4-6
• US Class Current: 604/322
• CPC Class Codes: A61L 11/00 Methods specially adapted for refuse disintegrating medical waste B02C19/0075; disposal of medical waste B09B3/00
• CPC Class Codes: A61M 1/60 Containers for suction drainage, adapted to be used with an external suction source containers not adapted for subjection to vacuum A61M1/69
• CPC Class Codes: A61M 1/73 comprising sensors or indicators for physical values
• CPC Class Codes: A61M 1/782 using valves with freely moving parts, e.g. float valves
• CPC Class Codes: A61M 1/784 by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves
• CPC Class Codes: A61M 1/882 Draining devices provided with means for releasing antimicrobial or gelation agents in the drained fluid
• CPC Class Codes: A61M 2205/3382 Upper level detectors
• CPC Class Codes: A61M 2205/3393 by weighing the reservoir

Abstract

A vessel (20) which is divided into compartments (22, 24) receives medical and biological fluid wastes through inlet fitting (12, 14). As the fluid is received, air in the vessel is displaced and is discharged through a vent line (32), either to atmosphere or to a vacuum source. When a level sensor (34) senses that a level of fluid in the vessel is approaching a preselected maximum, a control circuit (40) closes a valve (30) in the vent line, blocking the discharge of air from the vessel and creating a backpressure that stops the receipt of further fluid. Tubing connected to the fittings (12, 14) is disconnected from the patient or other source of fluid and a valve (64) is manually opened to vent the vessel, allowing any residual fluid in the tubing to be drained into the vessel. A drain valve (74) is opened to drain the vessel and the cleaning cycle is commenced. A fittings bell (194) is placed over each inlet fitting such that water with entrained disinfectant from disinfectant reservoir (122) disinfects the inlet nozzles inside and outside. The water with entrained disinfectant is also circulated through a metering reservoir (144) to spray nozzles (146) which spray down the interior surfaces of the vessel. After the nozzle and vessels have been decontaminated, the drain valve is closed and a valve (148) is opened to empty the metered volume of disinfectant solution from the metering chamber into the vessel.

Claims

1. An apparatus for handling biological and medical fluid wastes, the apparatus comprising:

at least one inlet fitting for interconnection with a flexible tube which is connected with a source of the fluid waste, the inlet fitting including a first connector for interconnection with the flexible tube and a second connector disposed adjacent the first connector;

a collection vessel connected with the inlet fitting such that received fluid waste flows into the vessel;

a drain line and a drain valve connected with the vessel for draining the vessel;

a disinfectant liquid source which supplies a disinfectant liquid;

a bell fitting connected with the source of disinfectant liquid and connectable with the second connector with the first connector received in and displaced from the bell fitting, such that a fluid circulation region is defined between the bell fitting and the first connector such that the disinfectant liquid flows around and through the first connector to the vessel;

a vent line and a first vent valve connected between the vessel and one of (1) a vacuum source and (2) the atmosphere for removing gases displaced by collected fluid waste from the vessel;

a level sensor for sensing a level of fluid waste in the vessel;

an automatic shut-off circuit connected with the level sensor and the vent valve for blocking the removed gases from the vessel in response to the level sensor sensing that the fluid level in the vessel is approaching a preselected capacity to slop the vessel from receiving the fluid waste.

2. The apparatus as set forth in claim 1 further including a filter connected with the vent line for filtering microbes, bacteria, and other potentially infectious organisms from the vented gases.

3. The apparatus as set forth in claim 1 further including:

a second inlet;

at least one second fitting for interconnection with a second flexible tude which is connected with a source of the fluid waste;

a second collection vessel connected with the second inlet fitting such that received fluid waste flows into the second vessel;

a second drain line and a second drain valve connected with the second vessel for draining the second vessel;

a second bell fitting connected with the source of disinfectant liquid and connectable over the second inlet fitting for supplying disinfectant around an outer surface of the second inlet fitting and through the second inlet fitting to the second vessel;

a second vent line and a second vent valve connected between the vessel and one of (1) a vacuum source and (2) the atmosphere;

a second level sensor for sensing a level of fluid waste in the second vessel;

the automatic shut-off circuit being connected with the second level sensor and the second vent valve for selectively closing the second vent valve in response to the second level sensor sensing that the fluid level in the second vessel is approaching a preselected capacity.

4. The apparatus as set forth in claim 1 further comprising:

a tubular passage which is free of valves extending between the inlet fitting and the collection vessel.

5. An apparatus for handling biological and medical fluid wastes, the apparatus comprising:

at least one inlet fitting for interconnection with a flexible tube which is connected with a source of the fluid waste;

a collection vessel connected with the inlet fitting such that received fluid waste flows into the vessel;

a drain line and a drain valve connected with the vessel for draining the vessel;

a disinfectant liquid source which supplies a disinfectant liquid to the inlet fitting and to the collection vessel;

a vent line and a first vent valve connected between the vessel and one of (1) a vacuum source and (2) the atmosphere for removing gases displaced by the collected fluid waste from the vessel;

a manual second vent valve for manually venting the vessel to atmosphere, such that the vessel is manually vented to the atmosphere after the first vent valve is closed to assist in draining fluid waste in the flexible tube into the vessel

a level sensor for sensing a level of fluid waste in the vessel;

an automatic shut-off circuit connected with the level sensor and the first vent valve for blocking the removed gases from the vessel in response to the level sensor sensing that the fluid level in the vessel is approaching a preselected capacity to stop the vessel from receiving the fluid waste.

6. The apparatus as set forth in claim 5 wherein the disinfectant liquid source includes:

a pressure regulator for limiting a pressure of received water; and

a flow monitor for monitoring a flow rate of the received water, the flow monitor being connected with the automatic shut-off circuit for providing an indication of insufficient water flow rates thereto.

7. The apparatus as set forth in claim 5 further comprising:

a tubular passage which is free of valves extending between the inlet fitting and the collection vessel.

8. An apparatus for handling biological and medical fluid wastes, the apparatus comprising:

at least one inlet fitting for interconnection with a flexible tube which is connected with a source of the fluid waste;

a collection vessel connected with the inlet fitting such that received fluid waste flows into the vessel;

a drain line and a drain valve connected with the vessel for draining the vessel;

a disinfectant liquid source which supplies a disinfectant liquid to the inlet fitting and the collection vessel;

a vent line and a first vent valve connected between the vessel and one of (1) a vacuum source and (2) the atmosphere for removing gases displaced by collected fluid waste from the vessel;

an analog transducer for sensing a level of fluid waste in the vessel and providing an analog electrical output signal that is proportional to the sensed fluid waste level;

an analog-to-digital converter for digitizing the output signal from the analog transducer;

a digital readout for providing a digital indication of the sensed waste fluid level, the digital readout being connected with the analog-to-digital converter;

a microprocessor controller which receives the output signal from the analog-to-digital converter and includes a means for causing collection of the fluid waste to be stopped when the vessel nears a preselected capacity, a monitoring means for monitoring fluid waste levels in the vessel to assure proper draining and cleaning operations, and a means for causing an emergency shut-down in response to the monitoring means detecting an inappropriate fluid waste level in the vessel.

9. An apparatus for handling biological and medical fluid wastes, the apparatus comprising:

at least one inlet fitting for interconnection with a flexible tube which is connected with a source of the fluid waste;

a collection vessel connected with the inlet fitting such that received fluid waste flows into the vessel;

a drain line and a drain valve connected with the vessel for draining the vessel;

a mechanical float assembly, the mechanical float assembly including;

a float disposed in the vessel, the float moving up and down corresponding to a level of fluid waste in the vessel;

an indicator rod interconnected with the float such that the indicator rod moves up and down with the float;

a gauge mounted adjacent the indicator rod for providing a scale for assessing fluid level in the vessel; and

a mechanical adjustment for mechanically adjusting the gauge relative to the indicator rod and to accommodate an offset in indicator rod position when the vent tube is connected with the vacuum source as opposed to the atmosphere;

a disinfectant liquid source which supplies a disinfectant liquid;

a disinfectant fitting connected with the source of disinfectant liquid and connectable with the inlet fitting for supplying the disinfectant liquid to the inlet fitting and through the inlet fitting to the collection vessel;

a vent line and a first vent valve connected between the vessel and one of (1) a vacuum source and (2) the atmosphere for removing gases displaced by collected fluid waste from the collection vessel;

a level sensor for sensing a level of fluid waste in the vessel;

an automatic shut-off circuit connected with the level sensor and the vent valve for blocking the removed gases from the vessel in response to the level sensor sensing that the fluid level in the vessel is approaching a preselected capacity to stop the vessel from receiving the fluid waste.

10. An apparatus for handling biological and medical fluid wastes, the apparatus comprising:

at least one inlet fitting for interconnection with a flexible tube which is connected with a source of the fluid waste;

a collection vessel connected with the inlet fitting such that received fluid waste flows into the collection vessel;

a drain line and a drain valve connected with the collection vessel for draining the collection vessel;

a disinfectant reservoir for receiving disinfectant concentrate;

an entraining means for entraining the disinfectant concentrate from the disinfectant reservoir in a stream of received water to form a disinfectant liquid;

a disinfectant fitting connected with the entraining means and connectable with the inlet fitting for selectively supplying the decontamination solution to the inlet fitting and through the inlet fitting to the collection vessel;

a vent line and a first vent valve connected between the collection vessel and one of (1) a vacuum source and (2) the atmosphere for removing gases displaced by collected fluid waste from the collection vessel;

a level sensor for sensing a level of fluid waste in the collection vessel;

an electronic control connected with the level sensor and the vent valve for blocking the removed gases from the collection vessel in response to the level sensor sensing that the fluid level in the collection vessel is approaching a preselected capacity to stop the collection vessel from receiving the fluid waste;

a disinfectant concentrate supply interconnected with the disinfectant reservoir for maintaining the disinfectant concentrate in the reservoir; and

a monitor for monitoring the disinfectant concentrate and providing a signal to the electronic control in response to a failure to maintain the disinfectant concentrate in the reservoir.

11. The apparatus as set forth in claim 10 further including a valve vent passage connected with the disinfectant reservoir.

12. The apparatus as set forth in claim 10 further including:

a pump for pumping water from a water inlet to the entraining means; and

a valve connected between the pump and the disinfectant reservoir for preventing water and disinfectant liquid from being forced into the disinfectant reservoir.

13. An apparatus for handling biological and medical fluid wastes, the apparatus comprising:

at least one inlet fitting for interconnection with a flexible tube which is connected with a source of the fluid waste;

a collection vessel connected with the inlet fitting such that received fluid waste flows into the vessel;

a drain line and a drain valve connected with the vessel for draining the vessel;

a disinfectant liquid source which supplies a disinfectant liquid to the inlet fitting and the vessel;

a pump for pumping water and disinfectant liquid to the inlet and to an interior of the vessel;

a spray nozzle disposed adjacent an upper surface of the vessel for spraying down interior surfaces of the vessel with the disinfectant liquid, the spray nozzle being connected with the pump;

a vent line and a first vent valve connected between the vessel and one of (1) a vacuum source and (2) the atmosphere for removing gases displaced by the collected fluid waste from the vessel.

14. The apparatus as set forth in claim 13 wherein the disinfectant liquid source includes:

a disinfectant reservoir for holding a disinfectant concentrate;

an aspirator for entraining the disinfectant concentrate from the disinfectant reservoir in a stream of received water.

15. The apparatus as set forth in claim 13 wherein the vessel is divided into a plurality of chambers and further including a plurality of spray nozzles for spraying the interior surfaces of each of the plurality of chambers.

16. The apparatus as set forth in claim 13 further including a metering chamber disposed between the second valve and the spray nozzles, the metering chamber having an outlet adjacent an upper end thereof in fluid communication with the nozzles such that after the second valve is closed, a metered volume of disinfectant liquid is trapped in the metering chamber;

and

a disinfectant liquid release valve connected between a lower end of the metering chamber and the vessel for selectively discharging the metered volume of the disinfectant liquid into the vessel.

17. An apparatus for handling biological and medical fluid wastes, the apparatus comprising:

at least one inlet fitting for interconnection with a flexible tube which is connected with a source of the fluid waste, the inlet fitting having a male connector over which the flexible tube is frictionally received and an enlarged second connector disposed adjacent the male connector;

a collection vessel connected with the inlet fitting such than received fluid waste flows into the vessel;

a drain line and a drain valve connected with the vessel for draining the vessel;

a disinfectant liquid source which supplies a disinfectant liquid;

a bell fitting connected with the source of disinfectant liquid and connectable with the enlarged second connector with the male connector received in and displaced from the bell fitting such that a disinfectant liquid circulation region is defined between the bell fitting and the male connector such that the disinfectant liquid flows around and through the male connector to the collection vessel.

18. The apparatus as set forth in claim 17 wherein the disinfectant liquid source further

a pump for pumping water and entrained disinfectant through a first valve which is disposed between the liquid pump and the bell fitting and through a second valve which is interconnected between the pump and an interior of the vessel.