Surgery – Truss – Pad
Patent
1993-10-18
1995-06-06
Rimell, Sam
Surgery
Truss
Pad
123751, 123749, A61B 1734
Patent
active
054213479
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a disposable device for puncturing skin and the blood vessels beneath to obtain blood for subsequent testing, said device comprising a rod with an elongate body and a lancet embedded therein with an axially protruding tip; a sleeve with a through-hole to receive the body of the rod via the rear end of the sleeve; first stop means formed by a first radial projection means arranged on the body of the rod at a predetermined distance from the tip of the lancet, in cooperation with a second radial projection means arranged on the sleeve at a predetermined distance from its front end, said first stop means temporarily preventing insertion of the rod and retaining the tip of the lancet inside the sleeve in a starting position located a predetermined distance from the front end of the sleeve, the arresting function of the first stop means being overcome by the application of external pressure on the rear end of the rod; a second stop means formed by a pressure plate at the rear end of the rod, in cooperation with the rear end of the sleeve, said second stop means determining the operative end position of the tip of the lancet when it protrudes from the sleeve; and at least two longitudinal spring tongues made in one piece with the sleeve, distributed uniformly around its periphery, and extending into the sleeve to abut against the body of the rod thereby centering it and the lancet being retracted into the sleeve with the aid of the spring force produced in the tongues when the rod is pressed into the sleeve with the aid of said external force.
A device of the type described in the introduction is known through SE-8003057-0. Essential advantages with this type of device are that the rod and sleeve can be manufactured together in a single tool, the preferably needle-shaped lancet being embedded in the device so that it is fixed in the rod, its tip portion is enclosed in the sleeve and is therefore sterile, and it can easily be twisted to remove it from the sleeve when it is to be used. A finished sterile device can thus be obtained at a single injection moulding procedure and the device can therefore be manufactured at low cost. Although the known device gives a relatively low and brief sensation of pain when the lancet penetrates the skin, which occurs extremely quickly thanks to its special design, however, certain people may experience a somewhat higher sensation of pain than normal. In many cases this may be because the rod is not kept centred in the sleeve, the tip of the lancet being able to move freely outwards in any radial direction during the forward movement of the rod. This off-centering is caused by the necessity of a gap between rod and sleeve. Said oblique displacement of the lancet is particularly likely to occur if the external pressure is applied with a finger slithtly to the side of the pressure plate of the rod instead of centrally. Another drawback with the known device is that the lancet remains outside the sleeve after use, the remaining blood thereby constituting a serious infection risk. U.S. Pat. No. 4,616,649 and U.S. Pat. No. 4,624,253 describe different arrangements for solving the two problems just mentioned individually, but this is at the expense of poorer main function of the device and more expensive and complicated manufacture. U.S. Pat. No. 4,553,541 describes a lancet device with spring tongues intended to return the lancet to a protected position. However, the tongues work against the movement of the lancet out of the sleeve and therefore have a retarding effect on the projection of the lancet. Furthermore, the device is designed in accordance with a completely different, more complicated principle than that according to the invention and cannot be produced in a single tool.
The object of the present invention is to provide an improved device which has spring tongues arranged so that they both centre the lancet during its rapid movement towards and through the skin in relation to the sleeve, and retract the lancet back into the sleeve automatica
REFERENCES:
patent: 2442416 (1948-06-01), Kulicke, Jr.
patent: 4320769 (1982-03-01), Eichhorn et al.
patent: 4553541 (1985-11-01), Burns
patent: 4616649 (1986-10-01), Burns
patent: 4624253 (1986-11-01), Burns
patent: 4676244 (1987-06-01), Enstrom
patent: 4677979 (1987-07-01), Burns
patent: 4712548 (1987-12-01), Enstrom
patent: 4738261 (1988-04-01), Enstrom
patent: 4889117 (1989-12-01), Stevens
patent: 5304192 (1994-04-01), Crouse
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