the present invention relates to an apparatus and a method whereby intravenous therapy is applied to a subject , such that the incidence of phlebitis or thrombosis in a vein of the subject is substantially reduced without necessitating a multiplicity of intravenous entries . this is generally achieved by the use of a short multi - use entry - port or a standard intracatheter disposed in a vein of the subject . thereafter , a catheter having a flexible tube or cannula of a predetermined length , is attached thereto and slidably inserted therethrough into the vein of the subject . this procedure is sequentially illustrated in fig1 to 5 and described hereunder , in accordance with a preferred embodiment of the present invention . to reduce the risk of phlebitis or thrombosis , the catheter is periodically replaced with another of a different length , or the position of the catheter adjusted , without necessitating removal and relocation of the entry - port . referring to fig1 there is seen a partial cross - sectional view of a skin surface referenced 20 and a subcutaneous vein - wall referenced 22 . also seen is a multi - use entry - port , generally referenced 10 , subcutaneously introduced into vein 22 . entry - port 10 includes a cannula referenced 24 , securing lugs referenced 30 , a hub referenced 31 , and a luer lock adapter referenced 32 attached thereto . to facilitate piercing of the skin 20 and vein - wall 22 and achieving entry thereto , by cannula 24 , a needle generally referenced 26 is slidably positioned within multi - use entry - port 10 . a sharp extremity referenced 28 of needle 26 protrudes from a second end referenced 34 of cannula 24 and , to retain needle 26 in this position , it is fastened to adapter 32 by a threaded needle hub referenced 27 . it is necessary to avoid transfixing the vein 22 . after needle extremity 28 has pierced skin 20 and vein - wall 22 , and cannula end referenced 34 has entered a short distance into vein - wall 22 , needle 26 is partially withdrawn holding hub 27 , such that extremity 28 is no longer exposed . referring now to fig2 , there is seen multi - use entry - port 10 , inserted through skin 20 and vein wall 22 , having needle 26 slidably withdrawn therefrom . thereafter , referring to fig3 , there is seen , in accordance with a preferred embodiment of the present invention , adjacent to entry port 10 and prior to connection thereto , a flexible catheter , generally referenced 40 , having a flexible tube referenced 42 contained in an integral sterile sheath , referenced 48 . catheter 40 has a luer lock connector referenced 46 at a first end thereof . to facilitate dispensing of an additional medication , a second port referenced 49 , having a removable cover cap referenced 51 , is preferably formed at the first end of catheter 40 . referring now to fig3 a , there is seen an isometric projection view of catheter 40 , having an integral sterile environment containment sheath , prior to connecting to the multi - use entry - port and entry - port 10 , including a cover cap referenced 52 fastened over connector 46 . a luer lock slide adapter - connector referenced 44 is seen at a second end of catheter 40 thereby to connect second end of catheter 40 to adapter 32 of entry - port 10 . in order to facilitate insertion of catheter tube 42 through entry port 10 and into vein 22 , and , referring now to fig4 , there is seen catheter 40 having luer lock slide adapter - connector 44 connected to luer lock adapter 32 of multi - use entry - port 10 . tube 42 is then slidably inserted through multi - use entry - port 10 into vein 22 of the subject . furthermore , referring to fig5 , there is seen flexible tube 42 in position in vein 22 , after being slidably pushed through slide adapter - connector 44 into multi - use entry - port 10 and thereafter into and along vein 22 . luer lock connector 46 is moved until it is adjacent to luer lock slide adapter - connector 44 and fixably attached thereto . sterile sheath 48 is seen in a collapsed configuration , referenced 50 . after removing cover cap 52 , there is seen exposed a connector referenced 56 , thereby to facilitate connecting thereto an intravenous therapy device ( not shown ) such as an intravenous drip or hypodermic syringe . referring now to fig6 , there is seen , in accordance with a further embodiment of the present invention , a schematic isometric view of entry - port 10 together with alternative configurations of end 34 thereof . view a illustrates a straight cylindrical edge , generally referenced 53 . view b illustrates a tapered end generally referenced 55 having a tapered edge referenced 57 and an internal compression lip seal referenced 59 . referring now to fig7 , there is seen a partial cross - sectional view of end 34 of cannula 24 with catheter tube 42 passing therethrough . to achieve a seal between multi - use entry - port 10 and catheter flexible tube 42 , as mentioned above , second end 34 of multi - use entry - port 10 has a taper 57 , thereby to form an internal compression lip seal 59 against flexible tube 42 . in accordance with an alternative embodiment of the present invention , for specific applications , it is necessary to provide a stiffening effect to tube 42 for insertion into vein 22 . introduction of a stiffened catheter tube 42 is sequentially illustrated in fig8 to 11 . referring now to fig8 , there is seen a catheter , generally referenced 60 , substantially similar to that seen in fig1 - 7 hereinabove , including a stiffening element referenced 62 disposed slidably within flexible tube 42 . a cover cap referenced 64 at a first end thereof , serves as a hub to stiffening element 62 . stiffening element 62 facilitates insertion of catheter flexible tube 42 into a subject &# 39 ; s vein . referring to fig9 there is seen catheter 60 connected using connector 44 to entry - port 10 at adaptor 32 . there is further seen in fig1 , flexible tube 42 , including stiffening element 62 therein , fully inserted into a subject &# 39 ; s vein 22 and , there is seen in fig1 , stiffener 62 slidably withdrawn from tube 42 utilizing cover cap hub 64 . in accordance with a further embodiment of the present invention , referring to fig1 , multi - use entry - port 10 is formed having a locking device referenced 66 thereby to fasten catheter tube 42 at a predetermined position , relative to multi - use entry - port 10 and to the subject &# 39 ; s vein 22 . sheath 48 ( fig3 ) is seen in a partially collapsed configuration , referenced 69 , thereby to maintain sterility of the uninserted portion of tube 42 , that is , the portion remaining external to entry port 10 . in accordance with another embodiment , referring now to fig1 , multi - use entry - port 10 has a valve referenced 68 formed thereto , thereby to control or stop the rate of flow of liquid through catheter tube 42 . with regard to maintaining catheter tube 42 in a sterile environment prior to and during use , in accordance with a variation in an embodiment of the present invention , there is an integral sterile environment container , alternative to sterile sheath 48 ( fig3 ). referring now to fig1 , there is seen a generally cylindrical sterile container , generally referenced 70 , including a casing referenced 72 , an inlet port referenced 74 , having a connector 75 , axially disposed with respect to casing 72 . there is seen a tangentially disposed outlet port referenced 77 having a luer lock and a connector referenced 78 thereby to connect port 77 to connector 32 of entry - port 10 . catheter tube 42 is coiled reference 76 within casing 72 . after connector 77 is attached to entry - port 10 at adapter 32 , catheter tube 42 is extended by reeling from container 70 utilizing a knurled handle referenced 79 , thereby to pass through entry - port 10 into a vein ( not shown ) of a subject . an added variation of this embodiment to the present invention includes a clutch device incorporated into container 70 , thereby controlling the force exerted on extending catheter tube 42 using knurled handle 79 . this reduces the risk of damaging or piercing vein 22 while inserting catheter tube 4 through entry port 10 into vein 22 . sterile container 70 has advantages of being compact and easily handled by a medical professional even in non - ideal circumstances . there are practical advantages to the above - mentioned apparatus and method of insertion of a flexible catheter tube into a subcutaneous vein of a subject . the initial stage for carrying out the method in accordance with the preferred embodiment of the present invention is substantially similar to that presently utilized in most hospitals , using a short catheter or intracatheter . a multi - use entry - port or intracatheter is inserted into a subcutaneous vein of the subject . this requires no stitching to a subject &# 39 ; s limb to be fixed in position . adhesive tape is a successful securing device . the preferred embodiment further teaches the insertion of the flexible catheter tube into and through the entry - port or intracatheter and into the vein and secured to the entry port . furthermore , should there be an occurrence of fever or thrombosis , the flexible catheter tube is removed from the intracatheter and a new catheter tube inserted in its stead . both medical professional and subject are spared the trauma and time of re - inserting the intracatheter into another site . the removed catheter tube tip is sent for laboratory culture testing . in addition , should the subject experience any pain at the site of the tube tip due to phlebitis , another shorter or longer catheter tube is used to replace the troublesome tube without necessitating the re - insertion of the entry - port . with regard to maintaining sterility of the equipment and the subject , the above - mentioned procedure has an advantage insofar as there is no requirement for a sterile field of application of the catheter tube . because the flexible tube is supplied in an integral sterile container , insertion may be carried out under virtually any conditions , in the open and unaffected by environmental contamination . furthermore , only one medical professional , with little additional training , is able to carry out this procedure , without any specific immobilization or trauma of the subject . the procedure offers a safe and convenient method for atraumatic administration of intravenous therapy . the present invention , also , provides for insertion of catheters and other similar tubular devices through a multi - use entry port into various organs of the body . the entry port provides the medical professional with the means for repeatedly accessing an organ without having to repeatedly pierce the skin and organ wall of the subject . in addition , such access is achieved without requiring a sterile environment since each tubular device to be inserted is enclosed within an integral sterile container . it will be appreciated by persons skilled in the art that the present invention is not limited by the drawings and description hereinabove presented . rather , the invention is defined solely by the claims that follow .
a self - contained sterile catheter apparatus for use with an intravenous cannula element . the cannula element has first and second ends and a bore formed therebetween , and is configured for transcutaneous positioning such that the first end is adapted to protrude from a limb of a subject and the second end is brought into communication with an interior of a body organ of a subject . the self - contained sterile catheter apparatus includes first and second ends and a flexible catheter tube therebetween , the catheter tube having a predetermined length and a diameter adapted for slidable insertion through the bore of the intravenous cannula element into the subject , and an integral sterile environment containment element thereby to allow insertion of the catheter tube through the cannula element into the subject in a generally non - sterile environment .