STRUCTURE FOR CONNECTING A FLEXIBLE TUBE TO A SYRINGE

• US 3,752,510 A
• Filed: 10/07/1971
• Issued: 08/14/1973
• Est. Priority Date: 10/07/1971
• Status: Expired due to Term

• Current Assignee: Sherwood Medical Company (Medtronic Plc)
• Original Assignee: Edward F. Windischman, Howard E. Werner, John M. Chambers
• Inventors: Windischman, Edward F., Chambers, John M., Werner, Howard E.
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US05/187,471
• Time in Patent Office: 677 Days
• Field of Search: 285/343,423,334.4,322,382.7,323,248,249 128/248,214.4,218N
• US Class Current: 285/334.4
• CPC Class Codes: A61M 25/0014 Connecting a tube to a hub
• CPC Class Codes: A61M 39/12 for joining a flexible tube to a rigid attachment
• CPC Class Codes: A61M 5/344 using additional parts, e.g. clamping rings or collets
• CPC Class Codes: A61M 5/346 friction fit A61M5/344 takes precedence

Abstract

A connector structure for connecting a flexible tube end to a syringe having a luer tip including a plastic hub having a bore therethrough and connected to the tip, a retainer in the hub bore for retaining the tube end therein, and a plastic bushing arranged to constrict the retainer about the tube end to effect sealed frictional retention of the tube in the hub. A construction is disclosed in which the retainer and tube end are urged into a tapered bore portion of the hub bore by the bushing, and another construction in which the bushing constricts a hub portion about the retainer and tube.

Claims

1. A structure for connecting a flexible tube in sealed fluid communication with a syringe having a needle-mounting tip with an outer frusto-conical surface having a luer taper included angle of substantially 3* 26'"'"''"'"' 12'"'"''"'"''"'"''"'"' comprising a hub having an axial bore therethrough including a first bore portion adjacent the inner end thereof having a frusto-conical surface with a luer taper included angle of substantially 3* 26'"'"''"'"' 12'"'"''"'"''"'"''"'"' for receiving a tip in sealed fluid communication with said bore, and a second bore portion adjacent the outer end thereof having frustoconical walls tapering toward said first bore portion, retaining means of resilient metal having an axial inner end portion disposed in said second bore portion, said retaining means having an axial opening therethrough for receiving an end portion of a tube and at least one slot in said inner end portion extending to the axial inner end thereof so that said inner end portion is constrictable, and bushing means coupled to said outer end of said hub for axial movement between first and second positions relative to said hub said bushing means and said hub having, in said first position, means resisting axial movement of said bushing means relative to said hub, said bushing means having an opening for permitting the insertion of a flexible tube through said retaining means and into engagement with said frustoconical walls when said bushing means is in said first position, said bushing means being engageable with the outer end of said retaining means and movable from said first position without rotation relative to said hub to said second position to move said retaining means axially inwardly to urge said inner end portion of said retaining means against said frusto-conical walls to constrict said inner end portion of said retaining means about the tube with said retaining means frictionally engaging and urging the tube axially inwardly into wedged sealing engagement with said frusto-conical walls, said inner end portion of said retaining means grippingly engaging the tube when constricted to prevent axially outward movement of the tube from said frustoconical walls.

2. The structure according to claim 1 wherein said hub is plastic material, and said bushing means is slidable on said hub in an axial straight line between said first and second positions.

3. The structure according to claim 1 wherein said inner end portion of said retaining means is frusto-conical and tapering toward the axially inner end thereof.

4. A structure for connecting a flexible tube in sealed fluid communication with a syringe having a needle-mounting tip with an outer frusto-conical surface with a luer taper included angle of substantially 3* 26'"'"''"'"' 12'"'"''"'"''"'"''"'"' comprising a plastic hub having an axial bore therethrough including a first bore portion adjacent the inner end thereof being frusto-conical and complementary in shape to the shape of the surface of a tip for receiving a tip in sealed fluid communication with said bore, and a second bore portion adjacent the outer end thereof, said hub outer end having an outer frusto-conical surface, retaining means having at least one slot at the axially inner end thereof defining at least two constrictable portions with said constrictable portions disposed in said second bore portion, said retaining means having an axial opening therethrough for receiving an end portion of a flexible tube adapted for fluid communication with said bore, and plastic bushing means having a recess with frusto-conical side walls for receiving said outer frusto-conical surface of said hub outer end in frictional holding engagement and for effecting constriction of said constrictable portions, said bushing means having an opening in aligned relation with said axial opening for permitting the insertion of a flexible tube through said retaining means and into said second borE portion, said recess having walls in axial sliding engagement with the radial outer surface of said hub outer end, said bushing means being axially slidable from a first position relative to said hub wherein a tube may be passed through said retaining means and into engagement with the walls of said second bore portion to a second position wherein the tube is in sealing engagement with the walls of said second bore portion and said bushing means constricts said hub outer end to constrict said constrictable portions of said retaining means about the tube to prevent axial movement of the tube in a direction outwardly from said second bore portion.

5. A structure for connecting a flexible tube in sealed fluid communication with a syringe having a needle-mounting tip comprising a plastic hub having an axial bore therethrough including a first bore portion adjacent the inner end thereof complementary in shape to the shape of a tip for receiving a tip in sealed fluid communication with said bore, and a second bore portion adjacent the outer end thereof, retaining means having at least one slot at the axially inner end thereof defining at least two constrictable portions with said constrictable portions disposed in said second bore portion, said retaining means having an axial opening therethrough for receiving an end portion of a flexible tube adapted for fluid communication with said bore, and bushing means having a recess receiving said hub outer end and for effecting constriction of said constrictable portions, said bushing having an opening in aligned relation with said axial opening for permitting the insertion of a flexible tube through said retaining means and into said second bore portion, said recess having walls in axial sliding engagement with the radial outer surface of said hub outer end, said bushing means being axially slidable on said hub outer end from a first position relative to said hub wherein a tube may be passed through said retaining means and into engagement with the walls of said second bore portion to a second position to constrict said hub about the tube end portion and said retaining means wherein the tube is in sealing engagement with the walls of said second bore portion and said hub constricts said constrictable portions of said retaining means about the tube to prevent axial movement of the tube in a direction outwardly from said second bore portion.

6. The structure according to claim 5 wherein said hub outer end is tapered, and said bushing means has a tapered recess for receiving said hub opposite end, said bushing means being slidable relative to said hub to constrict said retaining means.

7. The structure according to claim 6 wherein said hub outer end and said retaining means are longitudinally slotted.

8. The structure according to claim 7 wherein said hub has readially outwardly extending ribs thereon engageable with said bushing means for limiting the axial movement of said bushing means relative to said hub, said tip has a luer taper, and said first bore portion is frustoconical for slidingly receiving said tip in fluid-tight holding engagement.