fig1 sets forth a partial section view of a catheter constructed in accordance with the present invention and referenced by numeral 10 . catheter 10 includes an elastic tube beginning at rounded end 16 of drain head 30 and ending in two divided sections at the opposite end , one of the sections branching off from collector fitting 12 and progressing through check valve 18 , hypodermic syringe connection 19 to hypodermic syringe 20 , which is removable ; the other section terminates in flexible container 26 for receiving the fluid being drained . proximate rounded end 16 of drain head 30 is an entrance hole 14 through which the fluid to be drained can enter and flow through main channel 28 , ending in flexible container 26 . in some cases , flexible container 26 is replaced by a long tube which ends in a conveniently placed open container . molded into the wall of the catheter parallel to the main channel are four secondary medicating channels 24a , 24b , 24c and 24d which extend from drain head 30 , where they are closed and sealed , to collector fitting 12 wherein they are all joined and feed into fitting outlet 17 . this flow line now passes through check valve 18 and hypodermic syringe connection 19 to hypodermic syringe 20 . at three - eights inch spacing or thereabout spacing along each medicating channel 24a , 24b , 24c , and 24d are slits 22 , which are made with a sharp piercing blade from the outside diameter 11 of catheter 10 through into medicating channels 24a , 24b , 24c and 24d . no material is removed from catheter 10 in making slit 22 , causing slit 22 to close up when the blade is withdrawn after cutting the slit . slits 22 are 0 . 06 or thereabout in length , their actual length being dependent upon the thickness of the wall from the outside diameter 22 to the closest wall of channel 24 and the durometer of the elastomeric material selected for the catheter . the determining factor is the pressure required in channels 24 provided by hypodermic syringe 20 to force the slit to open and release the anti - microbial agent to outside of catheter 10 . by providing this pressurized system , it is assured that all slits will open simultaneously and release the injected anti - microbial agent when hit with a pressure of more than that required to open the shortest slit . collector fitting 12 is sealingly attached to catheter 10 by adhesion or other method , which will not leak under the pressure of the fluid being pumped by the hypodermic syringe . catheter 10 is preferably constructed of a biocompatible polymer such as latex , polyvinyl chloride , polyurethane or silicone . fig2 sets forth an enlarged cross section view of catheter 10 showing four medicinal channels 24a , 24b , 24c and 24d and slits 22 passing from catheter outside diameter 22 through to channels 24a , b , c , and d . main channel 28 is shown passing through the center of catheter 10 . fig3 and 4 show further enlarged views of secondary medicinal channel 24a and slit 22 . typical of the operation of the present invention infection - resistant catheter is its use as a ureteral catheter . in this usage , the catheter is inserted through the urethra and into the bladder in order to control the outflow of urine from the bladder . for this purpose a material is selected which is a compromise -- it must be as soft as possible while still retaining enough stiffness to allow its insertion by compression against the resistance of the wall of the urethra . the outside diameter is 14f , a standard catheter designation . each f unit is 0 . 33 mm , therefore the diameter is 4 . 62 mm or 0 . 18 inches . after the catheter is in place with the catheter head inside the bladder and the drain outlet attached to an empty flexible container , a hypodermic syringe with the prescribed anti - microbial agent in its barrel is attached to the hypodermic connection and the syringe &# 39 ; s piston driver is pressed firmly and swiftly to the completely closed position , ejecting the anti - microbial agent into the secondary channels of the catheter . the collector fitting directs the agent to all secondary medicating channels simultaneously . the pressure exerted on the fluid by the syringe opens all slits simultaneously and flows the medicine outward and into the area between the urethra and the catheter outside diameter . a certain amount of the medicine will remain within the medicinal channels and is contained therein by the check valve located in front of the hypodermic syringe . after ejecting the medicine , the hypodermic syringe is removed . at regularly scheduled intervals , more anti - microbial fluid may be added or another medicine introduced . thus , the reader will see that the present invention provides a highly reliable , economical device which addresses a serious problem in health science . this basic improvement in catheters can result in prolonged life and reduced suffering for large numbers of ill people . with the continuous discovery of improved antibiotics the present invention provides a way of utilizing these medicines to their best advantage . while our description above contains many specific details , these should not be construed as limitations on the scope of the invention , but rather as an example of one of the many variations which are possible . for example , the slits indicated in the preferred embodiment may be replaced by needle punctures in which no material is removed but which provide a very small fluid passage when put under pressure . a balloon may be provided for catheter anchorage . the number of medicating channels may be reduced to as few as one or increased to more than four . anti - microbial , of course , includes anti - fungal and anti - viral activity as well . new discoveries in plastics may provide materials which are better suited to the application than those listed . while the embodiments described are typical of ureter catheters , the present invention can be adapted for use in wound drainage , transtrachial oxygen delivery , and other catheter requirements , accordingly , the scope of the invention should be determined not by the embodiments illustrated , but by the appended claims and their legal equivalents .
a draining catheter for the prevention of infectious diseases around its outside periphery , which has a secondary channel system for the application of anti - microbial agents to the area surrounding its outside periphery .