Pivoting joint infusion system with seal
An infusion system for delivery of therapeutic fluids from a remote source into a patient's body. The system has an infusion assembly, a rotating pivot joint member, a fluid connector assembly, and a sealing assembly retained within the infusion assembly between the housing of the infusion assembly and the rotating pivot joint member. The seal reduces leakage of fluids. The rotating joint may be pivoted to three distinct positions to allow for emplacement on the patient, delivery of the therapeutic fluid to the patient, and protected, sealed closure of the fluid channels to avoid patient fluid backflow.
1. An infusion system for delivery of a therapeutic fluid from a remote source into a patient's body comprising.
a main infusion unit having a housing, a cannula with an injection channel, said cannula attached at an underside of said main infusion unit, a first fluid channel in communication with said cannula, and a rotating joint member receiving chamber;
a rotating joint member having a central fluid channel, a needle emplacement channel, and a fluid infusion channel, all of said channels intersecting within a central portion of said rotating joint member, said rotating member adapted to be received within and rotatable within said chamber;
a fluid connector assembly having a fluid delivery channel, said fluid connector assembly attachable at an end of said rotating joint member such that said fluid delivery channel aligns with and is in communication with said central fluid channel of said rotating joint member, said fluid connector assembly attachable at a remote end to a delivery tube attached to said remote source of said therapeutic fluid;
a sealing assembly retained within said rotating joint member receiving chamber between said rotating joint member and said main infusion unit housing;
said rotating joint member rotatable from a first vertical emplacement position whereby an emplacement needle may be extended through said emplacement channel of said rotating joint member and through said injection channel of said cannula to subcutaneously pierce said patient to a second delivery position after said emplacement needle has been withdrawn from said patient and said fluid connector assembly has been attached at said near end to said rotating joint member, said second delivery position aligning said fluid infusion channel with said injection channel of said cannula to deliver said therapeutic fluid to said patient.
2. The system of claim 1 wherein said main infusion unit further comprises a recess in said housing to receive and retain a neck portion of said rotating joint member when said rotating joint member is rotated to a third position; and a cover on said housing to protect and cover an opening to said central fluid channel in said rotating joint member when said rotating joint member is rotated to said third position.
3. The system of claim 2 wherein said neck portion of said rotating joint member further comprises a seal ring.
4. The system of claim 2 wherein said rotating joint member further comprises opposing alignment and retention wings, said wings in sliding contact with a shoulder portion of said main infusion unit housing.
5. The system of claim 1 wherein said sealing assembly further comprises a L-shaped elastomeric seal member having a raised rim portion along a surface abutting said rotating joint member when said rotating joint member is retained in said rotating joint member receiving chamber.
6. The system of claim 5 wherein said seal member contacts and seals along more than 90° of the outer rotation surface of said rotating joint member.
7. The system of claim 1 wherein said rotating joint member further comprises axial rotation journals adapted to be received and rotatably retained in slots in said receiving chamber.
8. The system of claim 1 wherein said sealing assembly is retained in said receiving chamber by an overhanging ledge in said main infusion unit housing.