APPARATUS FOR ADMINISTERING FLUID TO A MEDICAL TUBE

Abstract

An apparatus 100 for use in tube feeding comprises a cylindrical body 110 provided with a first opening 120 and a second opening 130 connected by a flow channel 140. The body 110 comprises reagent 111, for determining a characteristic of fluid disposed in the body and a transparent window 112 through which the reagent 111 is visible. In use, a first end of an enternal feeding tube releasably engages with the first opening 120. The second, distal end of said feeding tube is disposed inside a patient to be fed. A second feeding tube engages with the second opening 130. The second feeding tube connects the apparatus 100 to a bi-directional pump operable: to pump enternal fluid from a reservoir, through the apparatus and into the enternal feeding tube; and to pump fluid from the patient into the body 110 of the apparatus 100. This allows a user to pump fluid from the patient into the body 110 of the apparatus 100 to react with the reagent 111. This thereby provides an indication of the acidity of the fluid and hence whether the second end of the feeding tube is disposed in the patent's stomach before commencing feeding.

Claims

1. (canceled)

2. (canceled)

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. (canceled)

10. (canceled)

11. (canceled)

12. (canceled)

13. (canceled)

14. (canceled)

15. (canceled)

16. An apparatus for attachment to a tube comprising: an engagement means arranged to allow releasable engagement of the apparatus with a first end of a tube; a means for drawing fluid out of the first end of the tube; a means for determining a characteristic of fluid drawn out of said tube; and a means for introducing fluid into the first end of the tube.

17. An apparatus as claimed in claim 16 wherein the means for determining a characteristic of fluid drawn out of the tube is provided as a separate, closed system that can be detached from other elements of the apparatus and wherein the separate, closed system is produced in sterile conditions and packaged so as to remain sterile until a user opens the packaging.

18. (canceled)

19. An apparatus as claimed in claim 16 wherein the apparatus is provided with a non-return valve disposed between the means for determining a characteristic of fluid and the means for drawing fluid out of the first end of the tube.

20. (canceled)

21. An apparatus as claimed in claim 16 wherein the apparatus comprises a second engagement means arranged to allow releasable engagement of the apparatus with a reservoir containing fluid that it is desired to be introduced into the first end of the tube.

22. (canceled)

23. An apparatus as claimed in claim 16 wherein the means for determining a characteristic of fluid disposed in the body comprises a reagent.

24. An apparatus as claimed in claim 16 wherein the apparatus comprises a comparison means operable to compare the characteristic of the fluid drawn out of the tube with predetermined criteria and if the predetermined criteria are not met the means for introducing fluid into the first end of the tube are disabled or locked so as to prevent fluid from being introduced into the tube.

25. (canceled)

26. (canceled)

27. An apparatus as claimed in claim 16 wherein the apparatus comprises an actuation means operable to cause the apparatus to draw a quantity of fluid out of the first end of the tube and to determine the characteristic of said fluid and/or cause the apparatus to introduce fluid into the first end of the tube.

28. (canceled)

29. (canceled)

30. An apparatus as claimed in claim 27 wherein once the apparatus has been releasably engaged with a first end of a tube the actuation means is operable to cause the apparatus to: draw a quantity of fluid out of the first end of the tube; determine the characteristic of said fluid; and compare the determined characteristic with predetermined criteria.

31. (canceled)

32. (canceled)

33. (canceled)

34. (canceled)

35. (canceled)

36. A control unit for an apparatus for attachment to a tube comprising: an engagement means arranged to allow releasable engagement of the apparatus with a first end of a tube; a means for drawing fluid out of the first end of the tube; a means for determining a characteristic of fluid drawn out of said tube; a means for introducing fluid into the first end of the tube; an actuation means operable to cause the apparatus to draw a quantity of fluid out of the first end of the tube, to determine the characteristic of said fluid, and to cause the apparatus to introduce fluid into the first end of the tube; and an indicator means operable to display a visual indication of the characteristic of the fluid drawn out of the tube, the control unit comprising: a housing wherein a surface of the housing is provided with an input means and a display means.

37. (canceled)

38. A control unit as claimed in claim 36 wherein the control unit is operable to cause the apparatus to aspirate a quantity of fluid out of the tube.

39. A control unit as claimed in claim 38 wherein the display means subsequently displays a prompt to a user indicating whether or not it is safe to introduce fluid into the tube.

40. (canceled)

41. A method of determining the location of a first end of a feeding tube using an apparatus comprising the steps of: releasably engaging the apparatus with a second end of the feeding tube using the first engagement means; releasably engaging the apparatus with a means for drawing fluid out of the feeding tube and into the apparatus using the second engagement means; using said means to draw a quantity of fluid out of the feeding tube and into the apparatus; and determining a characteristic of said fluid.

42. (canceled)

43. (canceled)

44. A method as claimed in claim 41 wherein the characteristic of fluid drawn out of the tube is its acidity.

45. A method as claimed in claim 41 wherein the means for determining a characteristic of fluid disposed in the body comprises a reagent.

46. (canceled)

47. A method as claimed in claim 41 wherein the apparatus is provided with a means for introducing fluid into the apparatus and the method further comprises the step of introducing fluid into the apparatus.

48. (canceled)

49. A method as claimed in claim 47 wherein this step is only performed if the acidity of the fluid drawn out of the feeding tube coincides with that of gastric juices.

50. A method as claimed in claim 41 wherein the method is part of a method of tube feeding a patient using an enternal feeding tube.

Description

[0058] In order that the invention may be more clearly understood embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, of which:

[0059] FIG. 1 is a plan view of an apparatus according to the first aspect of the present invention;

[0060] FIG. 2 is a cross sectional view of an apparatus according to the first aspect of the present invention;

[0061] FIG. 3 is a perspective view of an apparatus according to the first aspect of the present invention; and

[0062] FIG. 4 is a schematic diagram of the control system for an embodiment of an apparatus according to the second aspect of the present invention.

[0063] Referring to FIGS. 1-3, an apparatus 100 suitable for use in the fluid carrying system used fir tube feeding according to the first aspect of the present invention comprises a generally cylindrical body 110 provided with a first opening 120 and a second opening 130. The first opening 120 is provided at the end of a first generally cylindrical protrusion 121 and the second opening 130 is provided at the end of a second generally cylindrical protrusion 131. The first and second protrusions 121,131 are provided on a curved surface of the body 110 and are diametrically opposed.

[0064] The first and second protrusions 121,131 are each provided with reduced diameter section 122,132 in the region proximate to the first and second openings 120,130 respectively. These reduced diameter sections 122,132 constitute a male member that can facilitate releasable engagement with a tube (not shown) and thereby constitute first and second engagement means respectively.

[0065] The apparatus 100 may be formed from any suitable material and is preferably formed from a plastics material.

[0066] As can be seen in FIG. 2, the first and second openings are connected by a flow channel 140 so as to allow fluid to flow therebetween in either direction.

[0067] The body 110 comprises reagent 111, which is a means for determining a characteristic a fluid disposed in the body. The reagent comprises a pH indicator which will change colour upon contact with a fluid, the final colour being dependent upon the acidity of the fluid. The apparatus 100 therefore allows the acidity of a fluid that is pumped either way through a fluid carrying system to be determined.

[0068] The body 110 comprises a transparent window 112 through which the reagent 111 is visible. This serves as a visual indicator means.

[0069] In use, a first end of an enternal feeding tube releasably engages with the first protrusion 121, the first reduced diameter section 122 being pushed into the enternal feeding tube (not shown) to form a good seal. The second, distal end of said feeding tube is disposed inside a patient to be fed and may or may not be disposed in that patient's stomach. Said feeding tube may be any type of feeding tube and in particular may be a nasogastric feeding tube or a percutaneous endoscopic gastrostomy (PEG).

[0070] A second feeding tube engages with the second protrusion 131, the second reduced diameter section 132 being pushed into the second feeding tube (not shown) to form a good seal. The second feeding tube connects the apparatus 100 to a bi-directional infusion pump (not shown) which is operable: to pump enternal fluid from a reservoir, through the apparatus and into the enternal feeding tube; and to pump fluid from the patient into the body 110 of the apparatus 100.

[0071] Therefore, in use, the apparatus 100 is connected in line between a feeding tube and a pump operable to pump enternal fluid therethrought. Advantageously, this allows a user to ensure correct placement of enteral feeding tubes prior to administering enternal fluids. The pump is operated to pump fluid from the patient into the body 110 of the apparatus 100. Once in the body 110 the fluid will react with the reagent 111 which will change colour to a final colour indicative of the acidity of the fluid. If the acidity of the fluid matches that of gastric juices then it is assumed that the second, distal end of the feeding tube is disposed in the stomach of the patient and fluid can be safely administered via the feeding tube.

[0072] The principle is similar to a prior art technique but use of the apparatus according to the present invention reduces the number of connections and/or disconnections that need to be made to a feeding tube in order to aspirate a quantity of fluid therefrom and to introduce a quantity of fluid therein. Advantageously, this reduces the risk of contaminating the tube. This in turn can reduce the risk of infecting a patient that is being fed using the apparatus according to the present invention. The apparatus according to the present invention therefore simplifies the process; it can ensure that all necessary steps to check the location of a feeding tube are performed prior to feeding; it reduces the number of physical operations required of the user; and it reduces the risk that a user will come into contact with bodily fluids of a patient. The apparatus according to the present invention also reduces the amount of medical waste that must be disposed of relative to prior art techniques.

[0073] A non-return valve (not shown) is provided and is disposed between the apparatus 100 and the pump. Advantageously, this allows the pump to aspirate fluid out of the feeding tube and into the apparatus 100 so that its acidity may be determined whilst preventing the aspirated fluid from entering the pump.

[0074] The apparatus 100 may comprise a comparison means (not shown). The comparison means 100 may be operable to compare the acidity of the fluid drawn out of the enternal feeding tube as determined by the reagent 111 with predetermined criteria. For example, the criteria may require that the pH value of the fluid lies in a certain range. Preferably, this range coincides with the typical range of pH values of gastric juices. The comparison means may be operable to output a signal indicating whether or not the predetermined criteria are met. Said signal may be a digital signal.

[0075] The apparatus 100 may comprise a means for adjusting the flow of fluid through the body such as a valve (not shown). This can allow the speed and pressure to be varied for different feeding tube gauges.

[0076] Preferably, the apparatus 100 is provided as a single closed system. The single closed system is produced in sterile conditions and packaged so as to remain sterile until a user opens the packaging. Such an arrangement need only be removed from its sterile packaging and engaged with an enternal feeding tube and a second feeding tube. Advantageously, this minimises the number of operations that must be performed by the user in a non-sterile atmosphere which in turn reduces the risk of contaminating the first fluid carrying element and limits the risk of infecting a patient.

[0077] Referring now to FIG. 4, an embodiment of a control system 300 for an apparatus according to the second aspect of the present invention is shown.

[0078] The apparatus comprises: an engagement means (not shown) arranged to allow releasable engagement of the apparatus with a first end of a tube (not shown); a means 302 for drawing fluid out of the first end of the tube; a means 303 for determining a characteristic of fluid drawn out of said tube; and a means 304 for introducing fluid into the first end of the tube. The apparatus further comprises a comparison means 305. The comparison means 305 is operable to compare the characteristic of the fluid drawn out of the tube as determined by the means 304 with predetermined criteria.

[0079] The apparatus comprises a processing means 301 which may be programmable. The processing means is connected to and able to control: the means 302 for drawing fluid out of the first end of the tube; the means 303 for determining a characteristic of fluid drawn out of said tube; the means 304 for introducing fluid into the first end of the tube; and the comparison means 305.

[0080] The apparatus is provided with a control unit 306 which is also connected to the processing means 301. The control unit comprises a input means 306a and a display means 306b. The control unit 306 provides a user interface for the processing means 301. The input means 306a may comprise one or more buttons, a touchpad or any other means for inputting control commands. The display means 306b may comprise a transparent section of the housing, an LCD display, an LED display or any other visual indication as desired or required.

[0081] The above embodiments are described by way of example only. Many variations are possible without departing from the scope of the invention as defined in the appended claims.