Surgery – Diagnostic testing – Liquid collection
Patent
1998-04-16
1999-11-16
Hindenburg, Max
Surgery
Diagnostic testing
Liquid collection
604315, A61B 5103
Patent
active
059848766
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns an aspirator syringe.
Aspirator syringes intended for self-use to suck out venom from a bite or a sting are described in FR-A-2 408 738.
The above syringes have been a considerable commercial success but are relatively sophisticated devices incorporating a large number of parts and relatively costly to manufacture.
SUMMARY OF THE INVENTION
An aim of the invention is to provide a much more economical aspirator syringe designed to be discarded after use.
To this end the aspirator syringe in accordance with the invention consists of three parts including: a tubular plastic body defining over most of its length a sleeve open at one end and having an end wall at the other end, the sleeve having a smooth inside wall, the end wall having a central orifice delimited by a convergent annular lip directed axially towards the exterior of the sleeve, the body having two holding lugs projecting radially outwards; a plastic piston rod/piston assembly including a piston rod that is solid or has no through conduit therein and that passes through the orifice in the end wall and cooperates with the annular lip to form a seal, and a piston at the distal end of the piston rod having a divergent peripheral skirt directed towards the open end of the sleeve and cooperating in sealed manner with the smooth inside wall of the sleeve; and an actuator button fixed to the proximal end of the piston rod.
Further aspects of the invention include the following. The body one has an abutment with which the button comes into contact when the skirt of the piston is near the open end of the sleeve and is in contact with the smooth inside wall of the sleeve. The body has at its proximal end beyond the end wall an extension which defines two diametrically opposed notches. A proximal end part of the piston rod has a smaller cross-section than other parts of the piston rod, and the body includes relative locating means which locate the proximal end of the piston rod in line with the lip of the end wall without contact therewith. The button and the body may include relative locating means which locate the end of the skirt of the piston beyond the open end of the sleeve or facing an internal opening in the sleeve and without contact with the sleeve. The relative locating means may include a recess in the body nearer the end wall than the abutment means and a tooth that prevents the button from returning to the recess after it has moved beyond the abutment means.
The present invention also contemplates an aspirator device comprising an aspirator syringe consisting of three parts including a tubular plastic body, a piston rod/piston assembly and an actuator button, as described above, and the aspirator device further including at least one plastic nozzle adapted to fit over or in and to be sealed to the open end of the sleeve of the syringe.
Further aspects of the aspirator device include the following. The nozzle may include two aspirator conduits with different configurations and means for selecting one or the other of the conduits. The two conduits may project from the distal end of the nozzle, and at least one of the two conduits is adapted to be eliminated by means of a fragile area connecting it to the remainder of the nozzle. The two conduits may project from respective opposite ends of the nozzle which include means adapted to fit over or into the open end of the sleeve in one direction or the other. The at least one plastic nozzle may comprise at least two interchangeable nozzles having different aspiration configurations.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will now be described with reference to the appended drawings, in which:
FIG. 1 is a longitudinal sectional view of an aspirator syringe in accordance with the invention in a storage configuration;
FIG. 2 is a similar view showing the first phase of use of the syringe;
FIG. 3 is a similar view showing the second phase of use of the syringe;
FIG. 4 shows in longitudinal section a nozzle adapted to
REFERENCES:
patent: 4116240 (1978-09-01), Guiney
patent: 5095914 (1992-03-01), Sarstedt
patent: 5871456 (1999-02-01), Armstrong et al.
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