Patent Application
20130190701
The present invention relates generally to the unclogging of medical tubes, and more particularly, to a system and related method for unclogging such tubes.
Enteral feeding tubes are commonly utilized in medical practice. These may take the form of nasal-gastric tubes, small bowel tubes, gastrostomy tubes, or other methods. Alternatively, tubes may be used for gastrointestestinal (GI) tract suction or decompression. All tubes used in the GI tract can become clogged. Clogging is usually the result of solidification of an enteral feeding formula, or more commonly a mixture of crushed pills and the enteral feeding formula. Other types of clogs do occur however. If the tube cannot be unclogged, replacement becomes necessary which is costly, uncomfortable for the patient, and exposes the patient to additional risk of complications.
Current methods of tube unclogging include the injection of enzymes or solvents to dissolve the clog and pressure methods to force the clog out of the tube. The enzyme/solvent methods are frequently ineffective due to the particulate nature of crushed medications and the difficulty of dissolving them. Further, clogs can extend for long distances along small bore tubes and the enzyme/solvents only come into contact with the proximal aspect of the obstructing materials. Alternatively, small syringes may be used to generate high pressure within a closed system to unclog a tube. In addition to being minimally effective, the pressure method presents some safety concerns. For example, if the wall of the clogged tube were to rupture from the high pressure proximal to the outlet port at the end, the patient could receive enteral feeding and medications at the wrong level of the GI tract. This could result in reflux or aspiration which can be fatal.
In addition, most tubes are supplied with a guide wire to be used for initial insertion. The wire is withdrawn after the tube is confirmed to be in the proper position. Although one might be tempted to use the guide wire or similar wire to unclog a tube, no wire should be inserted into a tube for safety reasons. Insertion or re-insertion of a wire could lead to penetration through the side of the tube at a point of obstruction or a bend in the tube. Should that circumstance occur, the wire could potentially penetrate the lining of the GI tract in addition to creating an opening proximal to the end of the tube. In summary, although several means of tube unclogging exist, none have been shown to be safe and consistently effective.
Accordingly, a need exists for a system and related method for unclogging medical tubes. The system would preferably not require use of a wire, high pressure in a closed system, or rely solely on enzymes/solvents to unclog the medical tube. Even more, the apparatus would be easy to use and provide features designed to limit patient risk. All of the said features are provided by the following invention. Naturally, any improvements along such lines should contemplate good engineering practices, such as simplicity, ease of implementation, unobtrusiveness, stability, etc.
The present invention meets these needs by providing a medical tube unclogging system. In accordance with a first aspect of the invention, the medical tube unclogging system includes a tube for insertion into a lumen of a medical tube having a clog therein, a pump connected to the tube for generating a flow of fluid through the tube, and a fitting through which the tube passes having a first opening coupled to the medical tube, a second opening for receiving the tube, and a third opening through which fluid pumped through the tube and into the medical tube, and fragments of the clog can be exhausted. The tube may include a first portion having an external diameter that is larger than an internal diameter of the medical tube, and a second portion having an external diameter that is smaller than the internal diameter of the medical tube. In addition, the second portion of the tube may be no longer in length than the medical tube, and a reducer for coupling the first and second portions of the tube together may be utilized.
In accordance with other aspects of the invention, the third opening of the fitting is connected to a suction line to assist the exhaustion of the fluid and the fragments, and the flow of fluid generated by the pump is either constant or pulsating.
In yet another aspect of the invention, the medical tube unclogging system includes a sensor for monitoring a pressure of the fluid flowing through the tube and producing a signal indicative of the pressure, and a controller for receiving the signal from the sensor and adjusting the pump to increase, decrease or stop the flow of fluid through the tube generated by the pump. The sensor may be positioned for monitoring a pressure of the fluid adjacent an outlet of the pump, and a bypass valve for releasing fluid from the tube when the sensor determines that the pressure of the fluid flowing through the tube is above a predetermined level may be utilized.
In accordance with another aspect of the invention, a grip through which the tube passes may be utilized for releasably holding the tube during insertion into the lumen of the medical tube having the clog therein. The grip may include a trigger and a cam that contacts the tube for releasably holding the tube during insertion. In addition, the fluid of the flow of fluid may contain an ingestible lubricant to decrease friction between the tube and the medical tube.
In accordance with another aspect of the invention, the medical tube unclogging system includes a power supply, a reservoir of fluid, a tube for insertion into a lumen of a medical tube having a clog therein, a pump powered by the power supply and connected to the tube for generating a flow of fluid from the reservoir of fluid through the tube, a fitting through which the tube passes having a first opening coupled to the medical tube, a second opening for receiving the tube, and a third opening through which fluid pumped through the tube and into the medical tube, and fragments of the clog can be exhausted, a sensor for monitoring a pressure of the fluid flowing through the tube and producing a signal indicative of the pressure, and a controller for receiving the signal from the sensor and adjusting the pump to increase, decrease or stop the flow of fluid through the tube generated by the pump. The tube may include a first portion having an external diameter that is larger than an internal diameter of the medical tube, and a second portion having an external diameter that is smaller than the internal diameter of the medical tube. In addition, the second portion of the tube may be no longer in length than the medical tube, and a reducer for coupling the first and second portions of the tube together may be utilized. In addition, the third opening of the fitting may be connected to a suction line to assist the exhaustion of the fluid and the fragments, and the flow of fluid generated by the pump may be either constant or pulsating.
In another aspect of the invention, a method of unclogging a medical tube having a clog therein includes the steps of coupling a first opening of a fitting to the medical tube having the clog therein, passing a tube into a second opening of the fitting and out of the first opening of the fitting, inserting the tube into a lumen of the medical tube having the clog therein, pumping fluid through the tube, and exhausting the fluid pumped through the tube and into the medical tube having the clog, and fragments of the clog. In addition, the method may include sensing a pressure of the fluid pumped through the tube, producing a signal indicative of the pressure, and adjusting the step of pumping fluid through the tube by increasing, decreasing, or stopping the pumping of fluid.
In accordance with yet another aspect of the invention, a medical tube unclogging system includes a tube for insertion into a lumen of a medical tube having a clog therein, a pump for generating a flow of fluid through the tube, and a connector for connecting the tube and the pump, the connector indicating a size or a length of the tube for use in controlling the flow of fluid through the tube generated by the pump. A fitting through which the tube passes having a first opening coupled to the medical tube, a second opening for receiving the tube, and a third opening through which fluid pumped through the tube and into the medical tube, and fragments of the clog can be exhausted may also be utilized.
The tube may include a first portion having an external diameter that is larger than an internal diameter of the medical tube, and a second portion having an external diameter that is smaller than the internal diameter of the medical tube, the third opening of the fitting may be connected to a suction line to assist the exhaustion of the fluid and the fragments, and the flow of fluid generated by the pump may be either constant or pulsating. In addition, a sensor for monitoring a pressure of the fluid flowing through the tube capable of producing a signal indicative of the pressure may be provided. A controller for receiving the signal from the sensor and adjusting the pump to increase, decrease or stop the flow of fluid through the tube generated by the pump may be used, as well as, a bypass valve for releasing fluid from the tube when the sensor determines that the pressure of the fluid flowing through the tube is above a predetermined level.
Even more, the medical tube unclogging system may include a grip through which the tube passes for releasably holding the tube during insertion into the lumen of the medical tube having the clog therein. The grip may include a trigger and a cam that contacts the tube for releasably holding the tube during insertion. In addition, the fluid used may contain an ingestible lubricant to decrease friction between the tube and the medical tube.
These and other embodiments of the present invention will be set forth in the description which follows, and in part will become apparent to those of ordinary skill in the art by reference to the following description of the invention and referenced drawings or by practice of the invention. The claims, however, indicate the particularities of the invention.
The accompanying photographs/drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention and, together with the description, assist in explaining the principles of the invention. In the drawings:
In the following detailed description of the illustrated embodiments, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention and like numerals represent like details in the various figures. Also, it is to be understood that other embodiments may be utilized and that process, mechanical, electrical, arrangement, software and/or other changes may be made without departing from the scope of the present invention. In accordance with the present invention, methods and apparatus are hereinafter described for monitoring the amount of liquid in at least one container utilizing a non-invasive liquid level sensing system.
With reference to
The base unit 12 houses the pump 18, power supply 20, and fluid connections within a single case 34. A carrying handle which is not shown could be utilized to assist in moving the base unit 12. The pump 18 creates a pulsatile or a continuous flow of fluid (F) from the reservoir 16 through the unclogging tube 14 as shown by action arrows A through D. A diaphragm pump, a piston pump or any other type of pump mechanism may be used in accordance with the broadest aspects of the invention. Although not required, the embodiment described herein includes a pressure feedback system that is utilized to control an output pressure (Pout) of the pump 18. A sensor 36 is connected between an outlet side of the pump 18 and the unclogging tube 14 for monitoring the pressure of the fluid (F) flowing through the unclogging tube 14. Action arrow B shows the fluid (F) leaving the output side of the pump 18 and passing through the sensor 36. The sensor 36 produces a signal (Sout) indicative of the pressure that is communicated to a controller 38.
In the described embodiment, the controller 38 is a microprocessor which receives the signal (Sout) from the sensor 36. In turn, the controller 38 adjusts the operation of the pump 18 to increase, decrease, or stop the flow of fluid (F) through the unclogging tube 14. In this manner, a pressure operating range or simply a high pressure limit selected to ensure that the flow of fluid (F) is delivered through the unclogging tube 14 at a desired pressure or within selected parameters, is maintained throughout use of the system 10. In accordance with the broad teaching of the invention, any type of controller, processor or the like capable of receiving a signal indicative of pressure and adjusting or controlling the operation of a pump may be used.
In operation, a low pressure situation could result, for example, if the user were to shorten the length of the unclogging tubing 14. The pressure detected by the sensor 36 at the outflow of the pump 18 would read low while an excess pressure would be delivered at the distal end of the unclogging tube 14. In this situation, the sensor 36 would detect the low pressure and signal the controller 38 to adjust pump output accordingly, or shut the system down. In an embodiment where a pump that could generate a pressure high enough to damage the feeding tube or lining of the GI tract were used, then a high pressure limit could be incorporated to avoid those circumstances. In another alternate embodiment, a bypass valve 40 could be incorporated into the system to divert fluid (F) (shown by action arrow E) back to the reservoir 16 in the event of excess pressure.
The pump 18 generates the flow of fluid (F) from the reservoir 16 through the unclogging tube 14 and is electrically operated by a power supply 20. In the described embodiment, the power supply 20 is a rechargeable battery. Charging jacks 25 are provided on the base unit 12 to allow the power supply 20 to be recharged. Alternatively, the power supply 20 can be a disposable battery, an AC-DC power supply or the like, or simply electric line voltage. Even more, the pump 18 could be powered by vacuum lines or compressed gas lines (neither shown in
In the described embodiment, the pump 18 is driven by a variable speed motor or solenoid such that the generated flow of fluid (F) from the reservoir 16 and pressure are controlled. The fluid (F) utilized for unclogging medical tubes must be suitable for human ingestion. Water is the preferred unclogging fluid, but other options are possible including acidic compounds such as juice, or mixtures containing enzymatic solvents. In addition, the fluid (F) may contain an ingestible lubricant to decrease friction between the unclogging tube 14 and the medical tube (T). The lubricant can be oil, soap, silicone, or like ingredients having lubricating properties.
As best shown in
The relationship between the small bore tube 32 and the clogged feeding tube (T) is best shown in
In the described embodiment, the length of the small bore tube 32 is matched to the length of the clogged feeding tube (T) to avoid over insertion. Alternate embodiments could have varying lengths of the small bore tube 32. In addition, the different diameters of the large and small bore tubes 28, 32 prevent over insertion of the small bore tube into the clogged feeding tube (T). In accordance with the broad teaching of the invention, the unclogging tube 14 may be manufactured from multiple parts or integrally molded as a unitary piece. The unclogging tube 14 may also be supplied with a length measure and/or markings printed thereon to allow a user to trim the length of the small bore tube 32 to correspond to the length of the clogged feeding tube (T). A depth stop (not shown) could also be positioned along the length of the small bore tube 32 of the unclogging tube 14 to prevent over insertion as is known in the art.
In the described embodiment, both the large bore tube 28 and the small bore tube 32 of the unclogging tube 14 have minimal elasticity to allow maximal fluid pressure peaks to reach a distal end 42 of the small bore tube. Materials such as polyethylene for the large bore tube 32 and PTFE for the small bore tube 28, for example, are advantageous. As noted above and best shown in
In an alternate embodiment, one or both of connectors 24 and 26 for connecting the unclogging tube 14 to the pump 18 are designed to indicate a size or a length of the unclogging tube for use in controlling the flow of fluid (F) through the unclogging tube 14 generated by the pump. If different sizes or lengths of unclogging tubes are used, a desired pump pressure could be matched to a selected unclogging tube by use of tube-specific flanges located on the connector which trigger a switch located near or adjacent the connector 24. The design of the connector and signaling arrangement would provide optimal fluid flow into the unclogging tube 14, as well as rapid connection/disconnection with the base unit 12.
As best shown in
In an alternate embodiment of the invention shown in
As described above, the unclogging tube 14 and/or portions thereof, including the small bore tube 28 and large bore tube 32 may be made of materials such as polyethylene and PTFE. PTFE and similar materials have a natural lubricity. This is advantageous since it assists the insertion of the unclogging tube 14 through the fitting 44 and clogged feeding tube T allowing the tube 14 to pass smoothly. Lubricity, however, can also make insertion difficult for the user due a reduced ability to maintain a good grip on unclogging tube 14 during insertion. This is particularly true if resistance from a clog is encountered.
Accordingly, an alternate embodiment of the invention further includes a grip 60 or gripping tool through which the unclogging tube 14 passes for holding the unclogging tube during insertion into the lumen of the clogged feeding tube (T). The grip 60 is shown in
In a related method of unclogging a medical tube (T) having a clog (C) therein a first opening 46 of a fitting 44 is coupled to the medical tube. An unclogging tube 14 is passed into a second opening 48 of the fitting 44 and out of the first opening 46 and the fitting 44. The unclogging tube 14 and in particular a small bore tube 32 is inserting into a lumen of the clogged feeding tube (T). Fluid (F) is then pumped through the unclogging tube 14 and into the clogged feeding tube (T). The fluid (F) and fragments (F1-n) of the clog (C) are then exhausted. The method may further include sensing a pressure of the fluid (F) pumped through the unclogging tube 14 using a sensor 36. A signal indicative of the pressure may be produced, and the pumping of the fluid (F) through the unclogging tube 14 may be adjusted by increasing, decreasing, or stopping the pumping dependent upon the sensed pressure as indicated by the signal.
To use the medical tube unclogging system 10 of the described embodiment, the reservoir 16 is filled with water or other desired fluid (F). A user selects an appropriate length/diameter of a disposable small bore tube 32 of the unclogging tube 14, or trims a longer length tube to correspond with the length of the clogged feeding tube (T). Of note, most feeding tubes have their specifications printed near their proximal end. Unclogging tube 14 and in particular the large bore tube 28 is connected to the base unit 12 using connectors 24, 26. Fitting 44 is coupled to an end of the clogged feeding tube (T) using the appropriate diameter 46 or 48 of the fitting. A drain or vacuum tube (TDRAIN) is attached as desired to a third opening 50 of the fitting 44 for exhausting fluid (F) and fragments (F1-n) of the clog (C). The small bore tube 32 is inserted into the second or proximal opening 48 of the fitting 44 and passed into the clogged feeding tube (T). Pump 18 is activated when switch 23 is turned on. Fluid (F) flows from reservoir 16 through pump 18 and out of the distal end of small bore tube 32 of the unclogging tube 14 as shown by action arrows A-D in
The pulsatile or non-pulsatile fluid (F) operates to flush the obstructing material or clog (C) out of the clogged feeding tube (T). Moving the small bore tube 32 of the unclogging tube 14 in an oscillating inserting and withdrawing manner may be helpful. The mechanical force of unclogging tube 14 contacting the clog (C) helps to break up obstructing material in the clogged feeding tube (T) in addition to the fluid flow. The fluid (F) and fragments (F1-n) of the clog (C) return proximally between the exterior wall of small bore tube 32 of the unclogging tube 14 and the interior wall of clogged feeding tube (T) as shown by action arrows F1-Fn in
The user is alerted that the clog (C) has cleared when the fluid (F) and fragments (F1-n) of the clog (C) are no longer exhausted through the third opening 50 of the fitting 44. Rather, the fluid (F) and fragments (F1-n) of the clog (C) take a path of least resistance and are discharged distally into the patient's GI tract. Hence, an ingestible unclogging fluid must be used. The user does not need to insert the small bore tube 32 of the unclogging tube 14 beyond a point at which exhaust fluid (F) ceases to flow. Thus, in the event that the user selected an unclogging tube 14 which was too long, there would be a clear indication to the user that the clogged feeding tube (T) has been unclogged and there is no need to advance further. In this manner, the unclogging tube 14 should never extend beyond the distal end of the clogged feeding tube (T). Advantageously, fluid flow from the unclogging tube 14 also serves to flush and clean the walls of clogged feeding tube (T) proximally and distally to the clog (C) thereby helping to prevent another potential future clog.
The described embodiment of the invention also includes a pressure feedback system that is utilized to control an output pressure (Pout) of the pump 18. The sensor 36 is connected between an outlet side of the pump 18 and the unclogging tube 14 for monitoring the pressure of the fluid (F) flowing through the unclogging tube 14. When the switch 23 is activated and the pump becomes operational moving fluid (F) from the reservoir and through the sensor 36, the sensor produces a signal (Sout) indicative of the pressure. That signal (Sout) is communicated to the controller 38. In turn, the controller 38 adjusts the operation of the pump 18 to increase, decrease, or stop the flow of fluid (F) through the unclogging tube 14. In this manner, a pressure operating range or simply a high pressure limit selected to ensure that the flow of fluid (F) is delivered through the unclogging tube 14 at a desired pressure or within selected parameters, is maintained throughout use of the system 10.
In general, feeding tubes may also be obstructed due to a kink or excessive bend. In these circumstances, two possible results will occur with use of the present unclogging system 10. First, and preferably, passing the unclogging tube 14 through the medical tube may straighten out any kinks therein thereby eliminating the obstruction. The second possibility is that the kink will remain and the user will be unable to pass the unclogging tube 14 distal to the kink. The unclogging tube 14 lacks sufficient rigidity to penetrate through the wall of the feeding tube. So, in this least desired circumstance, the obstruction will remain and the user will have to replace the obstructed medical tube. Even in this suboptimal circumstance, it is important to note that no patient injury would result from use of the unclogging system 10. If the user were to attempt to unclog the clogged feeding tube (T) using a wire or similar rigid material, the wire could penetrate through the wall of the kinked tube and subsequently perforate the wall of the GI tract.
Ultimately, skilled artisans should recognize at least the following advantages. Namely, they should appreciate that the foregoing supports non-invasively measuring liquid levels in one or more containers without the need for specialized containers. The invention also provides the ability to monitor the liquid level in any container irrespective of size, shape or material, and even in multiple containers without the need for multiple probes or human intervention to move an apparatus from one container to another. All of the said features are provided by the following invention. Naturally, any improvements along such lines should contemplate good engineering practices, such as simplicity, ease of implementation, unobtrusiveness, stability, etc.
The foregoing has been described in terms of specific embodiments, but one of ordinary skill in the art will recognize that additional embodiments are possible without departing from its teachings. This detailed description, therefore, and particularly the specific details of the exemplary embodiments disclosed, is given primarily for clarity of understanding, and no unnecessary limitations are to be implied. Modifications will become evident to those skilled in the art upon reading this disclosure and may be made without departing from the spirit or scope of the invention. Relatively apparent modifications, of course, include combining the various features of one or more figures with the features of one or more of the other figures.
This application claims the benefit of U.S. Provisional Patent Application No. 61/588,445, filed Jan. 19, 2012, the disclosure of which is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 61588445 | Jan 2012 | US |
