Extension Tube Assembly

An extension tube assembly for fluidly connecting a catheter assembly to a hemodialysis machine, which comprises:

• an extension tube member including first and second extension segments, the first extension segment adapted for connection to a catheter hub and defining a first lumen, the second extension segment adapted for fluid connection to a hemodialysis machine and defining a second lumen;
• and
• a coupling mechanism adapted to connect the first and second extension segments to establish fluid communication between the first and second lumens, the coupling mechanism including:
• a first coupling mounted on a distal end of the first extension segment, the first coupling including an elongate member extending distally therefrom;
• and
• a second coupling mounted on a proximal end of the second extension segment, the second coupling including a recess adapted to receive the elongate member;
• wherein the first and second couplings jointly form a bayonet coupling mechanism to provide a releasable connection therebetween to permit selective connection and disconnection of the first and second extension segments, the coupling mechanism including:
• a pin protruding radially from the elongate member;
• and
• a slot formed on the second coupling, the slot having a curved profile.

An extension tube assembly for fluidly connecting a catheter assembly to a hemodialysis machine, which comprises:

• an extension tube member including first and second extension segments, the first extension segment adapted for connection to a catheter hub and defining a first lumen, the second extension segment adapted for fluid connection to a hemodialysis machine and defining a second lumen;
• and
• a coupling mechanism adapted to connect the first and second extension segments to establish fluid communication between the first and second lumens, the coupling mechanism including:
• a first coupling mounted on a distal end of the first extension segment, the first coupling including at least one flexible locking extension extending distally therefrom, the locking extension having an opening formed thereon;
• and
• a second coupling mounted on a proximal end of the second extension segment, the second coupling including at least one lug extending radially therefrom, the at least one lug being adapted to be received in the opening of the at least one flexible locking extension to establish a secure connection between the first and second couplings;
• wherein the first and second couplings cooperate to provide a releasable connection therebetween to permit selective connection and disconnection of the first and second extension segments;
• and
• wherein the first and second couplings collectively form a bore when connected to each other, the bore being configured to establish fluid communication between the first and second lumens.

An extension tube assembly for fluidly connecting a catheter assembly to a hemodialysis machine, which comprises:

• an extension tube member including first and second extension segments, the first extension segment adapted for connection to a catheter hub and defining a first lumen, the second extension segment adapted for fluid connection to a hemodialysis machine and defining a second lumen;
• and
• a coupling mechanism adapted to connect the first and second extension segments to establish fluid communication between the first and second lumens, the coupling mechanism including:
• a first coupling mounted on a distal end of the first extension segment, the first coupling including an extension extending distally therefrom, the extension having an external thread formed thereon;
• and
• a second coupling mounted on a proximal end of the second extension segment, the second coupling including a recess, the recess having an internal thread formed therein, the internal thread being adapted to threadly engage the external thread to establish a secure connection between the first and second couplings;
• wherein the first and second couplings cooperate to provide a releasable connection therebetween to permit selective connection and disconnection of the first and second extension segments;
• and
• wherein the first and second couplings collectively form a bore when connected to each other, the bore being configured to establish fluid communication between the first and second lumens.

An extension tube assembly for fluidly connecting a catheter assembly to a hemodialysis machine, which comprises:

• an extension tube member including first and second extension segments, the first extension segment adapted for connection to a catheter hub and defining a first lumen, the second extension segment adapted for fluid connection to a hemodialysis machine and defining a second lumen;
• and
• a coupling mechanism adapted to connect the first and second extension segments to establish fluid communication between the first and second lumens, the coupling mechanism including:
• a first coupling mounted on a distal end of the first extension segment, the first coupling including a body and first and second arms pivotally secured to the body, each of the first and second arms having a locking detent at a distal end thereof;
• and
• a second coupling mounted on a proximal end of the second extension segment, the second coupling including a first and second locking notches formed thereon, each notch being adapted to securely receive at least one of the locking detents to establish a secure connection between the first and second couplings;
• wherein the first and second couplings cooperate to provide a releasable connection therebetween to permit selective connection and disconnection of the first and second extension segments;
• and
• wherein the first and second couplings collectively form a bore when connected to each other, the bore being configured to establish fluid communication between the first and second lumens.