Dual-purpose catheter assembly
BACKGROUND OF THE INVENTION 
     A new type of valve for a dual purpose catheter has been devised by the present inventor and this valve has been described for use primarily with adults. However, there is often a need for applying suction and oxygen to an infant and the present invention relates to such use. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a dual-purpose catheter system embodying the invention; 
     FIG. 2 is a sectional exploded view of the control valve shown in FIG. 1; 
     FIG. 3 is a front elevational view of the control valve shown in FIG. 1; 
     FIG. 4 is a rear elevational view of the control valve of FIG. 1; 
     FIG. 5 is a sectional view of a portion of the control valve shown in Fig. and showing the relationship of certain parts when the of the invention control valve is assembled; 
     FIG. 6 is a perspective view of one portion of the control valve shown in FIG. 1; and 
     FIG. 7 is a plan view of the catheter system shown in FIG. 1. 
    
    
     DESCRIPTION OF THE INVENTION 
     The invention described herein includes a control valve for applying suction and oxygen separately to a patient. The invention comprises the combination of this control valve and a single small-diameter flexible tube through which oxygen and suction can be applied to a pediatric patient. The control valve includes some of the features of the valve described, and claimed in the subject inventor&#39;s U.S. Pat. No. 4,595,005 which is incorporated herein by reference. 
     Referring to the drawings and particularly to FIGS. 1 through 6 a dual purpose catheter system 10 embodying the invention includes a control valve 20 of a synthetic resinous material comprising two cylindrical bodies 30 and 40 rotatably coupled together. One body 30 includes a flat rear wall 44 through which first and second integral tubes 50 and 60 extend so that the two tubes lie inside and ouside the body 30 and thus inside the valve mechanism. The inner ends 51 and 61 of tubes 50 and 60 are as smooth as possible for a purpose to be described. Tube 50 is used for connection to a suction source and tube 60 for connection to an oxygen source and the suction tube 50 is preferably of larger diameter for identification purposes. 
     A portion 70 of the inner wall of body 30 (FIG. 2) near wall 44 is thickened or is reduced in inside diameter to provide an annular ledge 74 which acts as a stop for the leading end of body 40 when the two bodies are assembled. The rear wall 44 of the body 30 also has a central hole 80 and a notched tab 90 which is formed integral with the body 30 and extends partly across the hole 80. The tab 90 has a notch or depression 92 in its outer surface. 
     An operating finger tab 100 extends generally perpendicularly from the outer surface of the body 30 for manipulation by the operator of the catheter system The lower edge of tab 100 has a notch 102 for a purpose to be described. 
     The second body 40 includes a rear wall 110, whose inner surface is as smooth as possible, for mating with other parts to be described. The annular outer wall 120 of body 40 has a portion 122 of reduced thickness, or of smaller outside diameter, at its leading end for insertion into body 30. Also, the outer surface of the thicker portion 124 is provided with a region 130 of reduced thickness (FIG. 1) having a ledge 123 (FIGS. 1 and 2) where it joins the portion 122 of reduced thickness. An integral operating finger tab 140 extends generally prpendicularly from the thicker annular wall portion at one end of the portion 130 of reduced thickness. 
     The finger tabs 100 and 140 are provided with roughened strips 142 on their outer opposite faces (FIGS. 2, 3 and 4) to facilitate their manipulation by the user of the system. 
     Two tubes 150 and 160 extend awazy from the wall 110, tube 150 for oxygen and tube 160 for suction. The two tubes 150 and 160 communicate with the inside of the body 40 through holes 152 and 162 in the rear wall 110. The tubes 150 and 160 are of different sizes and cross-section shapes to serve as keys or guides for coupling the valve to other apparatus to be described. The rear wall 110 also has two holes 170 and 180 located on the same circumference as the two tubes 150 and 160. The wall also has a central opening 190. 
     When the two bodies 30 and 40 are put together, the thin annular wall 122 of the body 40 fit snugly into the opening in body 30 and the leading end 212 butts up against the ledge 74. Similarly, the leading end 214 of body 30 butts up against ledge 216 where wall 122 meets wall 124 of the body 40. Also, the inner ends 51 and 61 of tubes 50 and 60 form a tight fit against the inner surface 112 of rear wall 110 of body 40 to provide an essentially leak-proof coupling between body 30 and body 40. When the bodies 30 and 40 are put together, the finger tab 100 slips over the rim 132 and the notch 102 in the lower surface thereof engages and locks on the rim. 
     The two bodies 30 and 40 are held together securely and tightly by means of a helical spring 218 which is secured at its ends in the notches 92 and 210 in the tabs 90 and 200. In attaching the spring 218, with the two bodies 30 and 40 loosely coupled together, one end of the spring is shaped like a hook and is secured to notch 92 and, with the other end grasped by a hooked tool, the spring is rotated to bias it, and then its other end, which is also shaped like a hook, is set in notch 210 in tab 200, ands the bodies are thus locked together. The spring holds bodies 30 and 40 tightly together with the inner portions 51 and 61 of tubes 50 and 60 snug against the inner surface 112 of end wall 110. The bias set into the spring serves to keep the bodies 30 and 40 rotated so that the finger tabs 100 and 140 are at their maximum distance aparet. With this orientation of the bodies, the oxygen tube 60 is aligned with the oxygen feed tube 150 through its hole 152 in wall 110 and the suction tube 50 is aligned with hole 170 and the ambient atmosphere. When the tabs 100 and 140 are squeezed together, the suction tube 50 is aligned with suction tube 160 through its hole 162 in the wall 110 and the oxygen tube 60 is aligned with the hole 180 to the ambient atmosphere. 
     The tube 50 is connected by flexible plastic tubing 220 to a source of suction (not shown) and the tube 60 is similarly connected by tubing 230 to an oxygen source (not shown). 
     In order to render the system 10 a closed system wherein the patient can be isolated from the valve 20 and cannot lose oxygen through the tubes 150 or 160, valve 20 is constructed so that the entrance openings inside the valve to rigid tubes 150 and 160 and to the patient are alternately blocked off from the patient as suction and oxygen are applied to the patient. 
     This is achieved by providing a first solid boss or cylinder 260 on the inner surface 262 of the wall of valve portion 30 and positioned just beneath the tube 60. A similar second solid boss or cylinder 270 is provided on the surface 262 just beneath the tube 50. The two bosses are of such a length, like tubes 50 and 60, that they contact and form a tight fit against the inner surface 112 of valve portion 40 when the two parts 30 and 40 of the valve 20 are assembled. The bosses 260 and 270 are positioned so that, when the source of oxygen is connected through tube 60, tube 150 and tube 240 to the patient and the suction tube is coupled to the opening to the atmosphere, boss 260 blocks the opening to tube 160 and to a lumen leading to the patient so that the patient cannot breathe into the valve through this lumen. 
     Similarly, when the suction lines are aligned and the patient is being suctioned, the source of oxygen is aligned with the opening to the atmosphere and the second boss 270 blocks the opening into tube 150 and to the lumen to the patient. Thus the patient cannot breathe into or from the valve 20 through the oxygen lumen and he cannotlose oxygen through valve 20. 
     In order to use the catheter system 10 as a pediatric catheter which requires a single, small diameter lumen or catheter tube for use with small children or infants whose bodies cannot accommodate a double lumen catheter. Thus, according to the invention, a coupling manifold 280 is provided to couple the two tubes 150 and 160 to a single small diameter tube or lumen 290. The coupling manifold 280 is tubular in form and is preferably made of a rigid synthetic resinous material. The manifold tube includes two short tubes 300 and 310 which are shaped and dimensioned so that tube 300 can engage valve tube 150 securely and the second tube can engage valve tube 160 securely. 
     The manifold tube 300 has one closed end 302 and an open end 304 to which the single lumen is secured. The single lumen has holes 320 at its remote end through which oxygen and suction can flow. As shown in FIG. 1, the suction tube 310 of the manifold is positioned oxygen tube 300 is positioned remote from the closed end of the manifold and closer to the open end 304 thereof. This arrangement permits the manifold to be cleaned of any mucus which might remain therein after a suctioning operation is performed on a patient. The application of suction with the apparatus removed from the patient clears the manifold of mucus. 
     It is noted that when the system 10 is used, the manifold tube 300 lies horizontally across the valve 20 so that the lumen 290 extends away from the manifold and valve. With the lumen 290 thus extending away from and to the side of the valve, the user can sight more easily as he directs the lumen into the mouth of a child.