Infusion set

Details Infusion set Infusion set

1996-03-19

1998-06-09

Rimell, Sam

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604174, A61M 500

Patent

active

057626324

DESCRIPTION:

BRIEF SUMMARY
THIS INVENTION relates to an infusion set.
Throughout the specification she term "infusion set" shall be taken as comprising a base adapted to be capable of being manipulated by a user to effect insertion or removal of the infusion set, a hollow needle having one pointed free end and the other end supported from the base and a flexible delivery tube connected at one end to the other end of the needle, the other end of the flexible delivery tube being adapted to be connected to a receptacle or delivery means.
Infusion sets of the type described above are associated with a very high incidence of accidental needle stick injury. One reason for such is because in use, after the user has removed the line from the vein of a patient the needle is usually held such that it is suspended from the flexible delivery tubing and is therefore able to move in a unpredictable manner due to the flexible resilient nature of the flexible delivery tubing. Also the needle can be difficult to control when suspended from the flexible delivery tubing when being carried to a safe "sharps" disposal container and then can be difficult to insert in to the "sharps" container without the risk of puncturing the hands or arms of the user. There is also significant danger to any persons in the vicinity of the user when the used infusion set is being carried. Furthermore, such infusion sets carry a high risk of transmission of infection such as HIV, Hepatitis and the like ailments due to the substantial quantity of blood remaining within the infusion set.
It is an object of this invention to provide an infusion set which on completion of its use can be rendered safe.
In one form the invention resides in an infusion set where a portion of the flexible delivery tube is supported at a position spaced from its one end from a housing and where a flexible duct is concentrically provided over the flexible tubing between the base and the housing to enable slidable movement of the flexible tubing within the duct, said needle being longitudinally slidable in the base, said housing having an engagement means movable on the housing and in engagement with the flexible tubing to cause longitudinal movement of the needle in the base between an extended position and retracted position on movement of the engagement means.
According to a preferred feature of the invention, a delivery tube is substantially inextendable.
According to a further preferred feature of the invention, the needle is substantially incapable of rotation about its central axis with respect of the base. This can be achieved in one embodiment by forming the portion of the needle accommodated within the base when in the extended position to be asymmetric about its central axis and a passage formed in the base of a complementary cross-sectional configuration. One form of asymmetry comprises forming the needle to be convoluted. Alternatively, the needle may be supported within the base by a hub which is slidably received in the base and if desired the hub may be configured such that it is incapable of rotation within the passage. This latter function can be achieved by forming the hub to be non circular and the passage of complementary configuration.
According to a preferred feature of the invention, the needle when in the retracted position is engaged with the base to prevent movement from the retracted position to the extended position. In addition, the needle is preferably engagable with the base when at the extended position to prevent movement from the extended position until after a predetermined force has been applied to the needle by the delivery tube. The retention of the needle in the extended position and the retracted position may be provided by a first detent means and a second detent means respectively in the base which is engagable by the needle and/or the hub supporting the needle when at the extended or retracted position respectively.
According to a further preferred feature of the invention, the engagement means is incapable of a movement with respect to the housing which w

REFERENCES:
patent: 4676783 (1987-06-01), Jagger et al.
patent: 5067946 (1991-11-01), Zhadanov
patent: 5108376 (1992-04-01), Bonaldo
patent: 5152749 (1992-10-01), Giesy et al.
patent: 5192275 (1993-03-01), Burns
patent: 5380293 (1995-01-01), Grant
patent: 5395347 (1995-03-01), Blecher et al.
Copy of International Publication No. WO 88/07387 dated 6 Oct. 1988 entitled "Retractable Safety Needle".
Copy of International Publication No. WO 92/08502 dated 29 May 1992 entitled "Catheter Assembly Having Safety Means".
Copy of International Publication No. WO 94/11050 dated 16 May 1994 entitled "Catheter Introducer Assembly Including Needle Shield".

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