as illustrated in fig1 an endotracheal intubation assembly comprises an endotracheal tube or tubular member 12 provided with openings 14 and 16 at a proximal end and a distal end , respectively . tubular member 12 defines a longitudinally extending lumen ( not designated ) and is formed along an inner surface 18 with an ancillary tube 20 defining a channel extending parallel to the endotracheal tube lumen . as illustrated in fig2 tube 20 is provided at a distal end with a transparent end cap 22 which seals the tube . at a proximal end , tube 20 has an inlet stub 24 projecting from tubular member 12 to enable the insertion and subsequent removal of an optical fiber bundle 26 . bundle 26 includes a fiberoptic illumination guide 28 connected to a light source 30 and a fiberoptic cable 32 connected to a video camera 34 in turn connected to a video monitor 36 . upon insertion of bundle 26 into tube 20 via stub 24 , illumination guide 28 conducts electromagnetic radiation from source 30 along tubular member 12 . the radiation is emitted through end cap 22 to illuminate internal organic tissues of a patient upon insertion of tubular member 12 through a patient &# 39 ; s mouth . an image of the illuminated internal tissues is carried by cable 32 to video camera 34 which displays the image on monitor 36 . during insertion of tubular member 12 into the patient , monitor 36 is watched to ascertain the location of the distal end of the tubular member 12 . tubular member 12 is manipulated from outside the patient to control the positioning of the distal end of the tubular member in response to the image viewed on monitor 36 . as further illustrated in fig1 the endotracheal intubation assembly further comprises a monitoring device 38 ( e . g ., a computer ) connected to camera 34 for receiving images in electrically encoded form therefrom . the encoded images are fed to a comparator component 40 of monitoring device 38 which also receives an encoded video image from a memory 42 . the image stored in memory 42 is a reference image selected from the output of camera 34 in response to a signal from a selector switch 44 . selector switch 44 may be a button or sequence of buttons on a computer keyboard ( not separately illustrated ). upon completion of an intubation procedure , an operator activates switch 44 to load a desired image into memory 42 ( e . g ., an image of the bronchi ). the endotracheal tube 12 is connected to a respirator machine 45 so that the tube &# 39 ; s lumen communicates with the respirator machine in a closed system . during a subsequent surgical operation , wherein tube 12 is maintained free of obstructions , comparator 40 periodically checks ( for example , every twenty seconds ) the incoming image from camera 34 against the reference image stored in memory 42 to determine whether the selected intubation position is being maintained . upon a determination that tubular member 12 has slipped or been dislodged from a selected position , comparator 40 generates an alert signal which causes generation of an alert indication via an audio alert signal generator 46 . alternatively or additionally , the alert signal may be communicated via video monitor 36 . upon termination of the operation and removal of tubular member 12 from the patient , bundle 26 is extracted from tube 20 via stub 24 . bundle 26 may be reused in a subsequent operation , while tubular member 12 is discarded . as illustrated in fig3 another endotracheal intubation assembly includes an endotracheal tube or tubular member 48 provided with a permanent illumination guide 50 connectable to a light source 52 . the endotracheal tube 48 is further provided with a channel 54 for the insertion of a reusable fiberoptic cable 56 extending to a video camera 58 . the remainder of the endotracheal intubation assembly of fig3 is the same as the system described hereinabove with reference to fig1 . as illustrated in fig4 an endotracheal intubation assembly comprises an endotracheal tube or tubular member 62 provided with openings 64 and 66 at a proximal end and a distal end , respectively . an inner surface 68 of tubular member 62 defines a longitudinally extending lumen . an ancillary tube 70 defining a channel extending parallel to the endotracheal tube lumen is attached to tubular member 62 along inner surface 68 . tube 70 is provided at a distal end with an end cap 72 which seals the tube . at a proximal end , tube 70 has an inlet aperture 74 to enable the insertion and subsequent removal of a flexible rod 76 . rod 76 is provided at a distal end with an electromechanical transducer 78 for emitting ultrasonic pressure waves from the distal end of tubular member 62 . in addition , rod 76 is provided at its distal end with an electromechanical transducer 80 for sensing or picking up ultrasonic pressure waves reflected back to the distal end of tubular member 62 from internal structures of a patient during an endotracheal intubation procedure . transducer 78 is connected via one or more electrical leads 81 to a source or generator 82 of an ultrasonic frequency electrical signal , while transducer 80 is connected via one or more electrical leads 83 to a computer 84 or other component for analyzing ultrasonic frequencies sensed by pickup transducer 80 . ultrasonic analyzer computer 84 generates a video signal transmitted to a video monitor 86 . upon insertion of rod 76 into tube 70 via inlet aperture 74 and during insertion of the endotracheal tube into a patient , generator 82 transmits an ultrasonic signal along leads 81 to transducer 78 . transducer 78 consequently emits an energy waveform in the form of an ultrasonic pressure wave from the distal end of tubular member 62 . the pressure waveform is emitted through end cap 72 to impinge upon internal organic tissues of a patient upon insertion of tubular member 62 through a patient &# 39 ; s mouth . an image of the internal tissues is generated by computer or analyzer 84 and displayed on video monitor 86 . during insertion of tubular member 62 into the patient , monitor 86 is watched to ascertain the location of the distal end of the tubular member 62 . tubular member 62 is manipulated from outside the patient to control the positioning of the distal end of the tubular member in response to the image viewed on monitor 86 . as further illustrated in fig4 the endotracheal intubation assembly further comprises a monitoring device 88 ( e . g ., another computer or microprocessor ) connected to analyzer 84 for receiving images in electrically encoded form therefrom . the encoded images are fed to a comparator component 90 of monitoring device 88 which also receives an encoded video image from a memory 92 . the image stored in memory 92 is a reference image selected from the output of analyzer 84 in response to a signal from a selector switch 94 . selector switch 94 may be a button or sequence of buttons on a computer keyboard ( not separately illustrated ). upon completion of an intubation procedure , an operator activates switch 94 to load a desired image into memory 92 ( e . g ., an image of the bronchi ). the endotracheal tube 62 is connected to a respirator machine 95 so that the tube &# 39 ; s lumen ( 68 ) communicates with the respirator machine in a closed system . during a subsequent surgical operation , wherein tube 62 is maintained free of obstructions , comparator 90 periodically checks ( for example , every twenty seconds ) the incoming image from analyzer 84 against the reference image stored in memory 92 to determine whether the selected intubation position is being maintained . upon a determination that tubular member 62 has slipped or been dislodged from a selected position , comparator 90 generates an alert signal which causes generation of an alert indication via an audio alert signal generator 96 . alternatively or additionally , the alert signal may be communicated via video monitor 86 . upon termination of the operation and removal of tubular member 62 from the patient , rod 76 is extracted from tube 70 via aperture 74 . rod 76 may be reused in a subsequent operation , while tubular member 62 is discarded . although the invention has been described in terms of particular embodiments and applications , one of ordinary skill in the art , in light of this teaching , can generate additional embodiments and modifications without departing from the spirit of or exceeding the scope of the claimed invention . for example , a fiberoptic image transmission guide may be permanently attached to an endotracheal tube . however , it is expected that such an assembly would result in elevated costs . in addition , the automatic monitoring may be eliminated to control costs . in the embodiment of fig4 the information stored in memory 92 and evaluated by comparator 90 may take a form equivalent to a video image . for instance , analyzer 84 may process the incoming reflected ultrasonic waves to produce a structural codification not in the form of a video signal . the selector switch 94 may nevertheless be actuated in conjunction with an image on monitor 86 , so that the structural information in memory 92 is correlated to the desired image and corresponding intubation configuration . accordingly , it is to be understood that the drawings and descriptions herein are profferred by way of example to facilitate comprehension of the invention and should not be construed to limit the scope thereof .
in an endotracheal intubation method , during and after insertion of an endotracheal tube into a trachea of a patient , an image is transmitted along the endotracheal tube from a distal end to a proximal end thereof , thereby enabling an operator to determine proper placement of the endotracheal tube . the image transmitted from the distal end of the endotracheal tube may be automatically monitored by a computer . upon determination that an incoming image is different from a stored reference image , an alert signal is automatically issued to an operator , thereby indicating that the distal end of the endotracheal tube has moved from a predetermined position within the patient &# 39 ; s trachea . a desired image is selected upon insertion of a distal end portion of the endotracheal tube into a patient &# 39 ; s trachea .