COUPLING SYSTEM FOR SAFETY CANNULA

Abstract: A coupling system (10) for transferring fluids from a medicament-containing cartridge (40), to an injection side (72) comprises a fluid flow channel, a blunt cannula (16) defining the distal end (24) of the fluid flow channel, a needle cannula (18) defining the proximal end (22) of the fluid flow channel, and means (20) for fixedly connecting the needle cannula (18) to the blunt cannula (16).

Description: COUPLING SYSTEM FOR SAFETY CANNULA BACKGROUND OF THE INVENTION This is a continuation-in-part of Application Serial No. 08/372,271 filed January 13, 1995. Field of Invention This invention relates to coupling systems for transferring materials from one flow conduit to another. More particularly, the invention relates to a hub/safety needle cannuia designed for use in combination with medicament-containing cartridge units. Preferably, the hub/safety needle cannuia and cartridge unit is used in conjunction with a cartridge holder for purpose of safety and easy handling. Reported Developments Disposable medicament-containing cartridge-needle units for use in conjunction with reusable hypodermic syringe holders are well known in the art. Such cartridges conventionally feature a cylindrical body closed at the proximal end with a flexible piston slideable within the bore of the cartridge and closed at the distal necked-down end with a diaphragm secured to the cartridge by a crimped-on metal collar. The distal necked-down end conventionally is fitted with a steel needle/needle hub unit and a needle sheath. Such needle/needle hub units have, minimally, a sharp end, typical of the type associated with hypodermic syringes. Such cartridge-needle units can be used in conjunction with reusable syringe holders which allow the user to avoid handling the cartridge-needle unit when the needle is exposed. Nevertheless, health care workers are especially susceptible to accidental and potentially infectious, and indeed, on occasion, possibly fatal, needle strikes due to the careless handling and/or disposing of the cartridge-needle unit after use. The consequences to health care workers of strikes from needles contaminated with various infectious diseases, such as hepatitis or AIDS, can be particularly severe. The frequency of such accidental needle strikes in the United States is surprisingly great, and has been estimated to be approximately one million needle strikes per year. Moreover, the cost to health care organizations for the testing of health care workers accidentally stricken by used needles is a significant burden on health care costs. Therefore, it would be desirable to further protect health care workers by providing medicament containing cartridges without having to expose the user to the needle commonly associated with such cartridges. In response to the need of preventing "accidental needle strike injuries", numerous devices have been developed which shield or cover the shaφ needle tip. One recently developed system, as described in PCT/US89/00273, comprises a blunt cannuia which is to be received by a pre-slit injection site. Commercially available under the InterLink trademark, this pre-slit injection site and blunt cannuia have been adapted for intravenous administration as described in published patent applications and patents. One of the key features of this system is the elimination of traditional "sharp" needles which are used in various procedures. For example, as described in PCT/US90/01350, the blunt cannuia is depicted in a press-fit combination with a syringe of known construction. Rather than using a traditional needle, the blunt cannuia is attached to the syringe and then inserted through the pre-slit injection site located in an IV tubing line. The content of the syringe is then delivered into the IV line. Once the content is delivered, the cannuia is withdrawn from the site and properly disposed. Hence, the administration of the syringe content, through an IV line, can now be completed without the use of standard needles that can cause accidental needle strikes. Further, in response to the need of preventing accidental needle strike injuries the prior art has provided a conventional disposable medicament cartridge designed to receive a blunt cannuia and which is usable with pre-slit injection sites. More specifically, the coupling system for transferring fluid medicament from a cartridge to a pre-slit injection site comprises: a fluid flow channel; a blunt cannuia forming the distal end of the fluid flow channel to be received by the pre-slit injection site; a needle cannuia forming the proximal end of the fluid flow channel; and means for connecting the needle cannuia to the blunt cannuia. The means for connecting the needle cannuia to the blunt cannuia comprises a hub having a sleeve which extends around and beyond the proximal end of the needle cannuia so as to prevent accidental needle strike when the coupling system is snapped onto the fluid medicament-containing cartridge. While this coupling system prevents accidental needle strike injuries to the health care practitioner, and as a result, greatly advances the art of delivering fluid medicaments to patients, there is still a need for improving the coupling system in relation to its use with the pre-slit sites. The connection between the pre-slit site and the coupling system should provide for a leak-proof seal, easy alignment in repeated use, sufficient holding force to prevent fall-out and proper reseal of the septum in the pre-slit site to prevent entering of airborne foreign matter into the site. It is an object of the present invention to provide a coupling system for fluid medicaments containing cartridges from which such fluid medicaments can be delivered to an injection site without accidental needle strike to the health care professional or the patients. It is another object of the present invention to provide a coupling system used in conjunction with a pre-slit injection site that greatly reduces or eliminates leakage, misalignment and the entering of foreign matter into the injection site. It is still another object of the present invention to provide a more positive means of engaging and locking of the (luer) coupling system to reduce inadvertent disassembling of the cartridge from the injection site. It is still another object of the present invention to provide a coupling system with a fluid medicament containing cartridge unit which can be used in conjunction with a cartridge holder for purpose of safety and ease of handling. It is still another object of the present invention to provide a coupling system that is compatible with various pre-slit injection sites. It is still another object of the present invention to provide a coupling system having a retention feature which inhibits easy or unintentional removal of the coupling system from a pre- slit injection site. SUMMARY OF THE INVENTION In accordance with this invention, an improved coupling system is provided for transferring fluids from a medicament-containing cartridge to an injection site which reduces the possibility of accidental needle strikes. More specifically, the invention provides a coupling system for transferring fluid medicament from a cartridge to an injection site comprising three embodiments. EMBODIMENT I There is provided a coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system comprises: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia. It is an advantageous feature of this invention that an improved coupling system is provided for commercially available medicament-containing cartridges which can be used safely and effectively without exposing the user to the needle cannuia. This reduces the susceptibility of health care workers to accidental needle strikes. When the coupling system is used in conjunction with a cartridge, the assembly comprises: a coupling system for transferring a medicament from a cartridge to a pre-slit injection site in combination with a cartridge wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system in combination with a cartridge comprises: a cartridge, comprising a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and a coupling system for transferring said medicament from said cartridge to the pre-slit injection site, said coupling system comprising: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said hub comprises: a first sleeve located on the proximal end of the hub and designed to engage a closure on said medicament-containing cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strike. The coupling system is also used in combination with a cartridge and holder assembly, the combination comprising: (a) a pre-slit injection site; (b) a cartridge in a cartridge holder; and (c) a coupling system; wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said cartridge comprises: a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and said cartridge holder comprises a frame, a clamp and a plunger element containing a piston stem; said cartridge loaded into the frame of said cartridge holder; and wherein said coupling system for transferring said medicament from said cartridge to said pre-slit injection site comprises: a hub having a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a proximal and distal end and a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said hub comprises: a first sleeve located on the proximal end of the hub and designed to engage a closure on said medicament-containing cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strikes, wherein said cartridge can be advanced distally through said holder by rotating said clamp such that the proximal end of said needle cannuia penetrates said diaphragm, and said piston stem can be connected to said piston and actuated to drive said piston through said cartridge and expulse medicament contained in said cartridge through said fluid flow channel into pre-slit injection site. EMBODIMENT II In this embodiment of the present invention there is provided a coupling system that is compatible with various pre-slit injection sites. Accordingly, there is provided a coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system comprises: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia. When the coupling system is used in conjunction with a cartridge, the assembly comprises: a coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system in combination with a cartridge comprises: a cartridge, comprising a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and a coupling system for transferring said medicament from said cartridge to the pre-slit injection site, said coupling system comprising: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprises: a first sleeve located on the proximal end of the hub and designed to engage a closure on said medicament-containing cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strike. The coupling system is also used in combination with a cartridge holder and holder assembly, the combination comprising: a coupling system for transferring a medicament form a cartridge to a pre-slit injection site in combination with a cartridge and holder assembly, the combination comprising: (a) a pre-slit injection site; (b) a cartridge in a cartridge holder; and (c) a coupling system; wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end poπion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit site is not engaged by said catheter; wherein said cartridge comprises: a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and said cartridge holder comprises a frame, a clamp and a plunger element containing a piston stem; said cartridge loaded into the frame of said cartridge holder; and wherein said coupling system for transferring said medicament from said cartridge to said pre-slit injection site comprises: a hub having a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle poπion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strikes, wherein said cartridge can be advanced distally through said holder by rotating said clamp such that the proximal end of said needle cannuia penetrates said diaphragm, and said piston stem can be connected to said piston and actuated to drive said piston through said cartridge and expulse the fluid contents of said cartridge through said fluid flow channel into an injection site. EMBODIMENT HI Embodiment III of the present invention is designed to provide a coupling system having a retention feature which inhibits easy or unintentional removal of the coupling system from a pre-slit injection site. Accordingly, there is provided a coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit site is not engaged by said catheter; wherein said coupling system comprises: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion having a retention button thereon; a middle tapered poπion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle poπion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia. When the coupling system is used in conjunction with a cartridge, the assembly comprises: a coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end poπion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system in combination with a caπridge comprises: a cartridge, comprising a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and a coupling system for transferring said medicament from said cartridge to the pre-slit injection site, said coupling system comprising: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion having a retention button thereon; a middle tapered poπion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end poπion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprises: a first sleeve located on the proximal end of the hub and designed to engage a closure on said medicament-containing cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle poπion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strike. The coupling system is also used in combination with a cartridge holder and holder assembly, the combination comprising: a coupling system for transferring a medicament from a cartridge to a pre-slit injection site in combination with a cartridge and holder assembly, the combination comprising: (a) a pre-slit injection site; (b) a cartridge in a cartridge holder; and (c) a coupling system; wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit site is not engaged by said catheter; wherein said cartridge comprises: a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and said cartridge holder comprises a frame, a clamp and a plunger element containing a piston stem; said cartridge loaded into the frame of said cartridge holder; and wherein said coupling system for transferring said medicament from said cartridge to said pre-slit injection site comprises: a hub having a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion having a retention button thereon; a middle tapered poπion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle poπion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strikes, wherein said cartridge can be advanced distally through said holder by rotating said clamp such that the proximal end of said needle cannuia penetrates said diaphragm, and said piston stem can be connected to said piston and actuated to drive said piston through said cartridge and expulse the fluid contents of said cartridge through said fluid flow channel into an injection site. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded axial cross-section of the coupling system showing the cannuia and hub. Fig. 2 is an axial cross-section showing the hub taken along the plane defined by 3-3-4-4-3 in Fig. 1. Fig. 3 is a top plan view of the hub. Fig. 4 is a bottom plan view of the hub. Fig. 5 is a cross-section of the coupling system in combination with a liquid medication- containing cartridge. Fig. 6 is a cross-section of the coupling system and a pre-slit injection site. Fig. 7 is an exploded view of a cartridge holder used in conjunction with the coupling system/cartridge combination of the present invention. Fig. 8 is an exploded axial cross-section of the coupling system showing the cannuia and hub. Fig. 9 is an axial cross-section showing the hub taken along the plane defined by 3-3-4-4-3 in Fig. 1. Fig. 10 is a top plan view of the hub. Fig. 11 is a bottom plan view of the hub. Fig. 12 is a cross-section of the coupling system in combination with a liquid medication- containing cartridge. Fig. 13 is a cross-section of the coupling system and a pre-slit injection site. Fig. 14 is an exploded axial cross-section of the coupling system showing the cannuia and hub. Fig. 15 is an axial cross-section showing the hub taken along the plane defined by 3-3-4-4-3 in Fig. 14. Fig. 16 is a top plan view of the hub. Fig. 17 is a bottom plan view of the hub. Fig. 18 is a cross -section of the coupling system in combination with a liquid medication- containing cartridge. Fig. 19 is a cross-section of the coupling system and a pre-slit injection site. DESCRIPTION OF THE PREFERRED EMBODIMENTS While this invention is described hereinafter particularly with respect to preferred embodiments comprising: a coupling system for transferring fluids from a medicament- containing cartridge to a pre-slit injection site, it also finds utility in other coupling systems for transferring fluid materials from one flow conduit to another. The present invention is described in reference to prefeπed embodiments I, II and III shown by Figs. 1-7, Figs. 8-13 and Figs. 14-19 respectively. Embodiment I (FIGS. 1-7) With reference to the drawings of Figs. 1-7, the coupling system of Embodiment I of the present invention, represented generally by 10 in Fig. 1, is intended for use in combination with a conventional disposable medicament-containing cartridge. The coupling system includes a fluid flow channel comprising: a blunt cannuia 16 defining the distal end of the fluid flow channel, a needle cannuia 18 defining the proximal end of the fluid flow channel, and a hub 20 for connecting the needle cannuia to the blunt cannuia as well as serving other impoπant functions described hereinafter. As best can be seen in Figs. 1, 2, 3 and 4, hub 20 comprises: a unitary body having a proximal end 22 in the form of a first sleeve, a distal end 24 in the form of a second sleeve, and middle poπion 26 connecting the proximal end and the distal end. Middle portion 26 has an outside diameter which is smaller than the outside diameters of the sleeves on the proximal and distal ends of the hub. Preferably, middle poπion 26 is provided with a plurality of parallel ridges 28 connecting the proximal and distal ends of the hub and serve the puφoses of reinforcement and facilitating manufacturing. The middle portion 26 of hub 20, having a smaller outside diameter than the outside diameters of the first and second sleeves will snugly fit into the distal end of cartridge holder shown in Fig. 7. However, the larger diameter sleeves will serve as stopping means not allowing the cartridge coupling system to move axially within the cartridge holder. First sleeve forming the proximal end 22 of hub 20 has an inside diameter which is slightly less or equal to the outside diameter of the closure cap on the cartridge so that the sleeve may be snapped-on the closure cap when assembling the coupling system with the cartridge. Second sleeve forming the distal end 24 of hub 20 has an inside diameter that is larger than the outside diameter of a receiving means at the pre-slit injection site so as to allow the receiving means to fit inside the " second sleeve when the distal end of the coupling system is engaged with the receiving means of the pre-slit injection site. Second sleeve at the distal end 24 of hub 20 is provided with internal threads to allow receiving means to be threaded into said second sleeve thereby forming a tight, leak-proof connection between the respective pans. A fluid flow channel is provided in the coupling system comprising: the needle cannuia 18 and blunt cannuia 16. First sleeve 22 extends around and beyond the proximal end 12 of needle cannuia 18 when assembled. The assembly of the coupling system at the manufacturer's site viπually eliminates user exposure to accidental needle strikes. Needle cannuia 18 can be a single or double shaφ ended needle cannuia of the type commonly associated with hypodermic syringes. A needle cannuia of the single ended type, as shown in Fig. 1, is prefeπed. The needle cannuia preferably is fabricated of stainless steel. As shown in Fig. 6, for use with conventional cartridges, e.g., commercially available Caφuject™ sterile cartridges, the radius r of sleeve 22 is about 5 mm and the distance x between the end of sleeve 22 and the proximal end 12 of needle cannuia 18 preferably is at least about 2 mm, more preferably 3 mm, so that the proximal end of the needle cannuia is adequately shielded when the coupling system is not attached to the cartridge. The distal end of the needle cannuia 18 can be flush with the distal end of the blunt cannuia. However, to reduce the undesirable possibility of the needle cannuia extending beyond the distal end of the blunt cannuia due to manufacturing tolerances, a clearance of at least about 0.5 mm, and preferably, of about 1 mm can be provided between the distal end of the needle cannuia and the end of the blunt cannuia. Blunt cannuia 16 is tapered at its distal end to engage an injection site. The blunt cannuia 16 preferably is an integral pan of hub 20. The specifics of the design of the tapered blunt cannuia end portion of hub 20 can be ascertained with reference to PCT US89/000273, and PCT/US90/01350, the disclosures of which are hereby incoφorated by reference, which describe tapered blunt cannuia for use with pre-slit injection sites. Various means can be employed for fixedly connecting the needle cannuia to the blunt cannuia and/or the hub comprising the blunt cannuia. For example, the fluid flow path inside the blunt cannuia can be tapered such that the needle cannuia can be inserted into and adhesively connected to the blunt cannuia. Suitable adhesives include, e.g., an epoxy based resin, and can be applied to the outside surface of the needle cannuia prior to inseπion into the hub. Alternatively, the needle cannuia " can be inserted into the blunt cannuia or hub and the blunt cannuia or hub can be melted or welded to connect the needle cannuia to the blunt cannuia. A removable cover sheath 30 can be provided to suπound blunt cannuia 16 during storage and handling to preserve the sterility of the cannuia. Cover sheath 30 can be snapped into engagement with the hub to suπound and protect the outwardly projecting distal end of blunt cannuia 16. Referring to Fig. 5, disposable medication-containing cartridge 40 is of a conventional design and includes a hollow, transparent body which is prefilled with a supply of fluid medication or the like. Such cartridges cuπently are in widespread commercial use. Cartridge 40 includes a head 42 and a cylindrical body 44 which are coextensively joined together at a relatively narrow neck 46. A metallic end cap 48 covers a sealed diaphragm 50 which extends across cartridge 40 to prevent contamination and leakage of the fluid contents. A piston 52 is sized to be received in and slideable axially and reciprocally through the interior of cartridge 40. Piston 52 is formed from a relatively dense resilient material, e.g., rubber, and can be moved distally through cartridge 40 for expulsing the fluid contents of the cartridge via blunt cannuia 16 and needle cannuia 18. A screw-threaded rod 54 can be connected to the piston 52 so as to project outwardly from the end of piston 52. Screw- threaded rod 54 can be mated to a screw- threaded piston stem of an associated holder to complete a piston assembly for controlling the movement of piston 52 through the interior of cartridge 40. It is contemplated that other means known in the an can be employed for attaching the rod to the piston stem. The above-described medicament-containing cartridges are designed for use in conjunction with reusable disposable syringe holders. Exemplary useful syringe holders are described, for example, in Hadtke, U.S. Patent 4,585,445 and EPO 485,028 the disclosures of which are hereby incoφorated by reference. Such a syringe holder 56 as depicted in Fig. 7, can comprise a cylindrical frame 58, a clamp 60, and a plunger element 62 containing a piston stem 68. In prefeπed embodiments, the coupling system of this invention is practiced in conjunction with a pre-slit injection site as described in PCT/US89/00273, PCT/US90/01350 and depicted in Fig. 6. Injection site 72 has a cylindrical housing 74, a first end 76, a second end 78, and a hollow cylindrical fluid flow member 80 which can slideably engage a receiving member, e.g., the housing of a catheter, thereby providing a sterile fluid flow coupling. Internal male luer threads 82, shown to be carried by housing 74 adjacent the second end 78, engage a flange member (not illustrated) when the injection site is rotated. The injection site 72 contains a resealable septum 84 formed of, for example, a latex, synthetic rubber or thermoplastic elastomer. The septum 84 has either a paπial or complete opening or slit 86. The hub 20 preferably is attachable to the cartridge by snapping sleeve poπion 22 over the distal end of the cartridge to engage the metal cap 48. In order to obtain the requisite sterile seal and flexibility, the hub preferably is fabricated of a plastic material such as polyethylene or polypropylene, or a polypropylene copolymer containing a minor amount of, e.g., low density polyethylene, to increase the impact strength of the polymer. An example of the latter copolymer is Pro-fax 8523, available from Hi ont Incoφorated. Such copolymer is paπicularly preferred when the hub is prepared by conventional injection molding techniques. The coupling system 10 of this invention can be prepared by inseπing a needle cannuia 18 into hub 20. An adhesive, e.g., a UV curable epoxy resin, can be applied to the needle/inseπ interface and, subsequently, the resin can be cured. The coupling system 10 preferably is sterilizable such as by means of radiation, steam or ethylene oxide. The needle cannula-inseπ assembly can then be press fit through the sleeve 22 into the hub 20. The sheath 30 can then be fitted over the hub 20, and the coupling system-sheath assembly can be snap fitted over the necked down end of the cartridge 40. In use, the coupling system 10 of this invention operates in conjunction with conventional medicament-containing cartridges, reusable syringe holders and injection sites during and after administration of an injection as follows. In the injection state, the prefilled medication cartridge 40 fitted with the coupling system 10 of this invention is loaded into cylindrical frame 58 of an assembled reusable syringe holder 56 such as described above so that blunt cannuia 16 covered by sheath 30 extends distally outward from the frame. Cartridge 40 is then advanced by a health care worker distally through the holder by rotating clamping element 60 until the inwardly extending proximal end of needle cannuia 12 penetrates sealed diaphragm 50 of cartridge 40. Next, sheath 30 is removed to expose the outwardly extending distal end of blunt cannuia 16. A screw threaded piston stem 68 is connected to piston 52 at the screw- threaded rod 54 thereof. The blunt cannuia 16 is inserted into a pre-slit injection site, such as described above. Receiving means is threaded into internally threaded sleeve 24 of hub 20 to tightly hold the coupling system in place. An axially and distally directed force is applied by the health care worker to piston stem 62, via actuation button 70. The distal force is transfeπed from piston stem 68 to piston 52 to drive the piston through medicament-containing cartridge 40 and thereby expulse the fluid contents of the cartridge 40 via needle cannuia 18 through the fluid flow channel and into the fluid flow member 80 of the pre-slit injection site 72. After injection, the blunt cannuia 16 is removed from the injection site. Subsequently, the plunger rod 54 is unscrewed from the piston thread and pulled proximally back, the clamp 60 is rotated to free the cartridge 30 and the cartridge unit is disposed of in an appropriate manner, the needle cannuia 18 being safely covered by the hub 20, sleeve 22 and/or blunt cannuia 16 during the entire procedure, thus reducing the possibility of accidental needle strikes. Embodiment II (Figs. 8-13) With reference to the drawings of Figs. 8-13, the coupling system of Embodiment II of the present invention, represented generally by 10 in Fig. 8, is intended for use in combination with a conventional disposable medicament-containing cartridge. The coupling system includes a fluid flow channel comprising: a blunt cannuia 16 defining the distal end of the fluid flow channel, a needle cannuia 18 defining the proximal end of the fluid flow channel, and a hub 20 for connecting the needle cannuia to the blunt cannuia as well as serving other impoπant functions described hereinafter. As shown in Figs. 8, 9, 10 and 11, hub 20 comprises: a unitary body having a proximal end 22 in the form of a first sleeve, a distal end 24 in the form of a second sleeve, and middle poπion 26 connecting the proximal end and the distal end. Middle portion 26 has an outside diameter which is smaller than the outside diameters of the sleeves on the proximal and distal ends of the hub. Preferably, middle portion 26 is provided with a plurality of parallel ridges 28 connecting the proximal and distal ends of the hub and serve the puφoses of reinforcement and facilitating manufacturing. The middle portion 26 of hub 20, having a smaller outside diameter than the outside diameters of the first and second sleeves will snugly fit into the distal end of cartridge holder shown in Fig. 7 of Embodiment I. However, the larger diameter sleeves will serve as stopping means not allowing the cartridge coupling system to move axially within the cartridge holder. First sleeve forming the proximal end 22 of hub 20 has an inside diameter which is slightly less or equal to the outside diameter of the closure cap on the cartridge so that the sleeve may be snapped-on the closure cap when assembling the coupling system with the cartridge. Second sleeve forming the distal end 24 of hub 20 has an inside diameter that is larger than the outside diameter of a receiving means at the pre-slit injection site so as to allow the receiving means to fit inside the second sleeve when the distal end of the coupling system is engaged with the receiving means of the pre-slit injection site. Second sleeve at the distal end 24 of hub 20 is provided with internal threads to allow receiving means to be threaded into said second sleeve thereby forming a tight, leak-proof connection between the respective parts. A fluid flow channel is provided in the coupling system comprising: the needle cannuia 18 and blunt cannuia 16. First sleeve 22 extends around and beyond the proximal end 12 of needle cannuia 18 when assembled. The assembly of the coupling system at the manufacturer's site virtually eliminates user exposure to accidental needle strikes. Needle cannuia 18 can be a single or double shaφ ended needle cannuia of the type commonly associated with hypodermic syringes. A needle cannuia of the single ended type, as shown in Fig. 8, is prefeπed. The needle cannuia preferably is fabricated of stainless steel. As shown in Fig. 13, for use with conventional cartridges, e.g., commercially available Caφuject™ sterile cartridges, the radius r of sleeve 22 is about 5 mm and the distance x between the end of sleeve 22 and the proximal end 12 of needle cannuia 18 preferably is at least about 2 mm, more preferably 3 mm, so that the proximal end of the needle cannuia is adequately shielded when the coupling system is not attached to the cartridge. The distal end of the needle cannuia 18 can be flush with the distal end of the blunt cannuia. However, to reduce the undesirable possibility of the needle cannuia extending beyond the distal end of the blunt cannuia due to manufacturing tolerances, a clearance of at least about 0.5 mm, and preferably, of about 1 mm can be provided between the distal end of the needle cannuia and the end of the blunt cannuia. Blunt cannuia 16 is tapered at its distal end to engage an injection site. The blunt cannuia 16 preferably is an integral part of hub 20. Some of the specifics of the design of the tapered blunt cannuia end portion of hub 20 can be ascertained with reference to PCT/US89/000273, and PCT/US90/01350, the disclosures of which are hereby incoφorated by reference, which describe tapered blunt cannuia for use with pre-slit injection sites. Other specifics will be described hereunder as they relate to one of the objects of the present invention, i.e. to a coupling system that is compatible with various pre-slit injection sites. Blunt cannuia 16 is tapered at the distal end comprising: first portion 88'; second portion 90'; and 1 r thhiirrHd n pnorrttionn Q 92T' Various means can be employed for fixedly connecting the needle cannuia 18 to the blunt cannuia 16 and/or the hub 20 comprising the blunt cannuia. For example, the fluid flow path inside the blunt cannuia can be tapered such that the needle cannuia can be inserted into and adhesively connected to the blunt cannuia. Suitable adhesives include, e.g., an epoxy based resin, and can be applied to the outside surface of the needle cannuia prior to insertion into the hub. Alternatively, the needle cannuia can be inserted into the blunt cannuia or hub and the blunt cannuia or hub can be melted or welded to connect the needle cannuia to the blunt cannuia. A removable cover sheath 30 can be provided to suπound blunt cannuia 16 during storage and handling to preserve the sterility of the cannuia. Cover sheath 30 can be snapped into engagement with the hub to suπound and protect the outwardly projecting distal end of blunt cannuia 16. Referring to Fig. 12, disposable medication-containing cartridge 40 is of a conventional design and includes a hollow, transparent body which is prefilled with a supply of fluid medication or the like. Such cartridges cuπently are in widespread commercial use. Cartridge 40 includes a head 42 and a cylindrical body 44 which are coextensively joined together at a relatively naπow neck 46. A metallic end cap 48 covers a sealed diaphragm 50 which extends across cartridge 40 to prevent contamination and leakage of the fluid contents. A piston 52 is sized to be received in and slideable axially and reciprocally through the interior of cartridge 40. Piston 52 is formed from a relatively dense resilient material, e.g., rubber, and can be moved distally through cartridge 40 for expulsing the fluid contents of the cartridge via blunt cannuia 16 and needle cannuia 18. A screw-threaded rod 54 can be connected to the piston 52 so as to project outwardly from the end of piston 52. Screw-threaded rod 54 can be mated to a screw- threaded piston stem of an associated holder to complete a piston assembly for controlling the movement of piston 52 through the interior of cartridge 40. It is contemplated that other means known in the art can be employed for attaching the rod to the piston stem. The above-described medicament-containing cartridges are designed for use in conjunction with reusable disposable syringe holders. Exemplary useful syringe holders are described, for example, in Hadtke, U.S. Patent 4,585,445 and EPO 485,028 the disclosures of which are hereby incoφorated by reference. Such a syringe holder 56 as depicted in Fig. 7, can comprise a cylindrical frame 58, a clamp 60, and a plunger element 62 containing a piston stem 68. In this prefeπed embodiment, the coupling system of the invention is practiced in conjunction with a pre-slit injection site as described in PCT/US89/00273, PCT/US90/01350 and depicted in Fig. 13. Injection site 72 has a cylindrical housing 74, a first end 76, a second end 78, and a hollow cylindrical fluid flow member 80 which can slideably engage a receiving member, e.g., the housing of a catheter, thereby providing a sterile fluid flow coupling. Internal male luer threads 82, shown to be " carried by housing 74 adjacent the second end 78, engage a flange member (not illustrated) when the injection site is rotated. The injection site 72 contains a resealable septum 84 formed of, for example, a latex, synthetic rubber or thermoplastic elastomer. The septum 84 has either a paπial or complete opening or slit 86. Funnel-shaped fluid flow member 80 comprises: distal cylindrical end portion 88; middle tapered portion 90; and proximal cylindrical end portion 92. Distal cylindrical end portion 88 has a length, b, of from about 0.100" to about 0.300" and an inside diameter, e, of form about 0.070" to about 0.100". Middle tapered portion 90 has a length, a, of from about 0.090" to about 0.150" and preferably about 0.125" with a taper angle of form about 2° to about 20°, and preferably of from about 5° to about 15°. Proximal cylindrical end portion 92 has a length, d, of from about 0.180" to about 0.300" and preferably of about 0.250", and an inside diameter, g, of from about 0.100" to about 0.300". Funnel-shaped fluid flow member 80 will serve as the female portion when engaging blunt cannuia, 16, which is the male poπion. Injection site 72 containing funnel-shaped fluid flow member 80 therein is to engage cannuia 16 which comprises: distal, cylindrical end portion 88'; middle tapered portion 90'; and proximal cylindrical end portion 92'. Distal cylindrical end portion 88' has a length, b,' of from about 0.100" to about 0.300" and an outside diameter, e', of form about 0.070" to about 0.100". Middle tapered poπion 90' has a length, a', of from about 0.090" to about 0.150" and preferably about 0.125" with a taper angle of from about 2° to about 20°, and preferably of from about 5° to about 15°. Proximal cylindrical end poπion 92' has a length, d', of from about 0.180" to about 0.300" and preferably of about 0.250", and an outside diameter, g', of from about 0.100" to about 0.300". When engaged, distal cylindrical end poπion 88' of blunt cannuia 16 will fit into distal cylindrical end portion of funnel-shaped fluid flow member 88; middle tapered portion 90' of blunt cannuia 16 will fit into middle tapered portion 90 of funnel-shaped fluid flow member; and proximal cylindrical end portion 92' of blunt cannuia 16 will fit into proximal cylindrical end portion 92 of funnel-shaped fluid flow member. The dimensions of the funnel-shaped fluid flow member 80, serving as a female member, and the dimensions of the blunt cannuia 16, serving as a male member, are adjusted so that there exists a frictional fit with sufficient conformity to prevent leakage during the practice of the present invention. Thus, the outside diameters of the three portions of the male member may be one or two percent smaller than the inside diameters of the three portions of the female member. The hub 20 preferably is attachable to the cartridge by snapping sleeve poπion 22 over the distal end of the cartridge to engage the metal cap 48. In order to obtain the requisite sterile seal and flexibility, the hub preferably is fabricated of a plastic material such as polyethylene or polypropylene, or a polypropylene copolymer containing a minor amount of, e.g., low density polyethylene, to increase the impact strength of the polymer. An example of the latter copolymer is Pro-fax 8523, available from Himont Incoφorated. Such copolymer is paπicularly prefeπed when the hub is prepared by conventional injection molding techniques. The coupling system 10 of this invention can be prepared by inseπing a needle cannuia 18 into hub 20. An adhesive, e.g., a UV curable epoxy resin, can be applied to the needle/inseπ interface and, subsequently, the resin can be cured. The coupling system 10 preferably is sterilizable such as by means of radiation, steam or ethylene oxide. The needle cannula-insert assembly can then be press fit through the sleeve 22 into the hub 20. The sheath 30 can then be fitted over the hub 20, and the coupling system-sheath assembly can be snap fitted over the necked down end of the caπridge 40. In use, the coupling system 10 of this invention operates in conjunction with conventional medicament-containing cartridges, reusable syringe holders and injection sites during and after administration of an injection as follows. In the injection state, the prefilled medication cartridge 40 fitted with the coupling system 10 of this invention is loaded into cylindrical frame 58 of an assembled reusable syringe holder 56 such as described above so that blunt cannuia 16 covered by sheath 30 extends distally outward from the frame. Cartridge 40 is then advanced by a health care worker distally through the holder by rotating clamping element 60 until the inwardly extending proximal end of needle cannuia 12 penetrates sealed diaphragm 50 of cartridge 40. Next, sheath 30 is removed to expose the outwardly extending distal end of blunt cannuia 16. A screw threaded piston stem 68 is connected to piston 52 at the screw-threaded rod 54 thereof. The blunt cannuia 16 is inserted into a pre-slit injection site, such as described above. Receiving means is threaded into internally threaded sleeve 24 of hub 20 to tightly hold the coupling system in place. An axially and distally directed force is applied by the health care worker to piston stem 62, via actuation button 70. The distal force is transfeπed from piston stem 68 to piston 52 to drive the piston through medicament-containing cartridge 40 and thereby expulse the fluid contents of the cartridge 40 via needle cannuia 18 through the fluid flow channel and into the fluid flow member 80 of the pre-slit injection site 72. After injection, the blunt cannuia 16 is removed from the injection site. Subsequently, the plunger rod 54 is unscrewed from the piston thread and pulled proximally back, the clamp 60 is rotated to free the cartridge 30 and the cartridge unit is disposed of in an appropriate manner, the needle cannuia 18 being safely covered by the hub 20, sleeve 22 and/or blunt cannuia 16 during the entire procedure, thus reducing the possibility of accidental needle strikes. Embodiment III (Figs. 14-19) Figs. 14-19 show Embodiment III of the present invention wherein a retention feature in the form of a button 94 is molded onto the distal cylindrical end poπion 88' of blunt cannuia 16 which serves to inhibit easy or accidental removal of blunt cannuia 16 from injection site 72. The details of this embodiment is analogous to Embodiment II except for retention feature in the form of a button which is described hereunder. As best can be seen in Fig. 19, retention button 94 is located at the distal cylindrical end poπion 88' of blunt cannuia 16 and comprises: length, h, of from about 0.005" to about 0.010" and width, i, of from about 0.005" to about 0.010". Upon inseπion of blunt cannuia 16 into injection site 72: retention button 94 will fit into distal cylindrical end poπion of funnel-shaped fluid flow member 88; middle tapered portion 90' of blunt cannuia 16 will fit into middle tapered poπion 90 of funnel-shaped fluid flow member; and proximal cylindrical end poπion 92' of blunt cannuia 16 will fit into proximal cylindrical end portion 92 of funnel-shaped fluid flow member. Similarly to Embodiment II, the dimensions of the funnel-shaped fluid flow member 80 serving as a female member, and the dimensions of the blunt cannuia 16, having retention button 94 thereon, serving as a male member, are adjusted so that there exists a frictional fit with sufficient conformity to prevent leakage during the practice of the present invention. Retention button 94 prevents easy or accidental removal of blunt cannuia 16 from injection site 72: upon an external pulling force exened upon blunt cannuia 16, retention button 94 will contact resealable septum 84 which will prevent fuπher movement of the retention button 94 outward form injection site 72. The invention has been described in detail with paπicular reference to cenain prefeπed embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.

Claims: WHAT IS CLAIMED IS: 1. A coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system comprises: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia. 2. A coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system in combination with a cartridge comprises: a cartridge, comprising a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and a coupling system for transferring said medicament from said cartridge to the pre-slit injection site, said coupling system comprising: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end poπion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprises: a first sleeve located on the proximal end of the hub and designed to engage a closure on said medicament-containing cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle poπion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strike. 3. A coupling system for transferring a medicament form a cartridge to a pre-slit injection site in combination with a cartridge and holder assembly, the combination comprising: (a) a pre-slit injection site; (b) a cartridge in a cartridge holder; and (c) a coupling system; wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end poπion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit site is not engaged by said catheter; wherein said cartridge comprises: a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and said cartridge holder comprises a frame, a clamp and a plunger element containing a piston stem; said cartridge loaded into the frame of said cartridge holder; and wherein said coupling system for transferring said medicament from said cartridge to said pre-slit injection site comprises: a hub having a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strikes, wherein said cartridge can be advanced distally through said holder by rotating said clamp such that the proximal end of said needle cannuia penetrates said diaphragm, and said piston stem can be connected to said piston and actuated to drive said piston through said cartridge and expulse the fluid contents of said cartridge through said fluid flow channel into an injection site. 4. A coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end ponion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit site is not engaged by said catheter; wherein said coupling system comprises: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion having a retention button thereon; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia. 5. A coupling system for transferring a medicament from a cartridge to a pre-slit injection site wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit injection site is not engaged by said catheter; wherein said coupling system in combination with a cartridge comprises: a cartridge, comprising a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and a coupling system for transferring said medicament from said caπridge to the pre-slit injection site, said coupling system comprising: a hub having a proximal and distal end and a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion having a retention button thereon; a middle tapered ponion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprises: a first sleeve located on the proximal end of the hub and designed to engage a closure on said medicament-containing cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle portion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strike. 6. A coupling system for transferring a medicament from a cartridge to a pre-slit injection site in combination with a cartridge and holder assembly, the combination comprising: (a) a pre-slit injection site; (b) a cartridge in a cartridge holder; and (c) a coupling system; wherein said pre-slit injection site comprises: a cylindrical housing having a first end and a second end; internal male luer threads located in said cylindrical housing adjacent to said second end to receive and engage a catheter having female luer threads thereon; a hollow cylindrical funnel-shaped fluid flow member providing a sterile fluid flow coupling when said catheter is engaged with said pre-slit injection site; said hollow cylindrical funnel-shaped fluid flow member being a female member comprising: a distal cylindrical end portion; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said cylindrical funnel-shaped fluid flow member; and a proximal cylindrical end portion; and a resealable septum located at the first end of said housing to seal said pre-slit injection site when said pre-slit site is not engaged by said catheter; wherein said cartridge comprises: a hollow body prefilled with a medicament having a sealed diaphragm on the distal end thereof and a piston axially and reciprocally slideable through the interior of said body; and said cartridge holder comprises a frame, a clamp and a plunger element containing a piston stem; said cartridge loaded into the frame of said cartridge holder; and wherein said coupling system for transferring said medicament from said cartridge to said pre-slit injection site comprises: a hub having a flow channel located centrally therein, said flow channel comprising: a needle cannuia having a shaφ end at the proximal end of the hub; and a blunt cannuia at the distal end of the hub; said blunt cannuia being a male member comprising: a distal cylindrical end portion having a retention button thereon; a middle tapered portion having a taper angle of from about 2° to about 20° to the longitudinal axis of said blunt cannuia; and a proximal cylindrical end portion; said male member is designed to engage said female member when the coupling system is connected to the injection site; said hub comprising: a first sleeve located on the proximal end of the hub and designed to engage a closure on a cartridge; a second sleeve located on the distal end of the hub having internal threads thereon to engage said catheter connected to said pre-slit injection site; and a middle ponion integral with and connecting the sleeves on the proximal and distal ends of the hub; said first sleeve covering in a spaced relationship and extending beyond the shaφ end of said needle cannuia to prevent accidental needle strikes, wherein said cartridge can be advanced distally through said holder by rotating said clamp such that the proximal end of said needle cannuia penetrates said diaphragm, and said piston stem can be connected to said piston and actuated to drive said piston through said cartridge and expulse the fluid contents of said cartridge through said fluid flow channel into an injection site.

Inventors: DELUCCIA ROBERT J, HOOVER LINN C, HOYES JAMES E, MALLON MICHAEL T, NIEDOSPIAL JOHN J, DELUCCIA, ROBERT, J., HOOVER, LINN, C., HOYES, JAMES, E., MALLON, MICHAEL, T., NIEDOSPIAL, JOHN, J.
Applicants: SANOFI WINTHROP INC, SANOFI WINTHROP, INC.
Application year: 1996
Main classification: A61M25
IPC codes: A61J1, A61M39