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US 4,392,859 AGranted
Fitments for injection devices
AssigneeSterimatic Holdings Limited
InventorHugh R. Dent
Life of this patent
Estimating the term…
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AssigneeSterimatic Holdings Limited
InventorHugh R. Dent
Estimating the term…
In order to minimize the risk of infection when a large number of animals are injected with the same needle, the injecting gun is provided with a stainless steel sleeve which surrounds the needle. The sleeve comprises a first tube attached to the needle connecting body and a second tube telescopically slidable within the first tube against a spring. A detachable plastics cap incorporating a sterilizing substance is fitted on the free end of the second tube. In use of the gun to inject an animal, the cap is applied to the proposed site of injection and pressure is applied to the gun to cause the tubes to telescope, so that the point of the needle passes through the sterilizing substance and punctures the skin of the animal. On releasing the applied pressure, the point of the needle will be withdrawn from the animal and will pass back through the sterilizing substance under the action of the spring.
A sterilizing fitment for an injection device of the kind in which injection liquid is delivered through a hollow needle, the fitment being provided to sterilize the needle prior to its application to the site of injection and again on withdrawal of the needle from the site of injection, which fitment comprises a collapsible sleeve comprising two telescoping tubes for surrounding the needle, means at one end of the sleeve on one of said tubes for attaching the sleeve to a needle support of the injection device, wall means at the other end of the sleeve on the other of said tubes closing off said other end so as to enclose the needle, and sterilizing means in the vicinity of said other end of the sleeve, the two ends of the collapsible sleeve being reciprocable relative to one another in the direction of the length of the needle and being resiliently biased in the extended position, whereby, in use, when an injection is effected by placing said other end of the sleeve against the injection site and applying pressure to the injection device in a direction towards the injection site, the point of the needle moves through the wall means and the sterilizing means into the injection site as the sleeve collapses under the applied pressure and subsequently moves back through the wall means and the sterilizing means as the sleeve reassumes its extended position on release of said pressure.
An injection device comprising a support for a hollow needle, a reservoir for injection liquid, means for delivering injection liquid from the reservoir through the needle, and a fitment for sterilizing the needle prior to application of the needle to the site of injection and again on withdrawal of the needle from the site of injection, the fitment comprising a collapsible sleeve comprising two telescoping tubes for surrounding the needle, one end of the sleeve being attached by one of said tubes to the needle support, wall means at the other end of the sleeve on the other of said tubes closing off said other end so as to enclose the needle, and sterilizing means in the vicinity of said other end of the sleeve, the two ends of the collapsible sleeve being reciprocable relative to one another in the direction of the length of the needle and being resiliently biased in the extended position, whereby, when an injection is effected by placing said other end of the sleeve against the injection site and applying pressure to the injection device in a direction towards the injection site, the point of the needle moves through the wall means and the sterilizing means into the injection site as the sleeve collapses under the applied pressure and subsequently moves back through the wall means and the sterilizing means as the sleeve reassumes its extended position on release of said pressure.
A sterilizing substance holder for a sterilizing fitment for an injection device of the kind in which injection liquid is delivered through a hollow needle, the fitment being provided to sterilize the needle prior to its application to the site of injection and against on withdrawal of the needle from the site of injection and comprising a collapsible sleeve comprising two telescoping tubes for surrounding the needle and attachable at one end of said sleeve by one of said tubes to a needle support of the injection device, the two ends of the collapsible sleeve being reciprocable relative to one another in the direction of the length of the needle and being resiliently biased in the extended position, the holder being adapted to be fitted to the other end of the sleeve on the other of said tubes to close off said other end so as to enclose the needle and comprising an enclosure containing a body of absorbent material impregnated with a sterilizing substance, whereby, in use, when an injection is effected by placing said other end of the sleeve with the holder fitted thereto against the injection site and applying pressure to the injection device in a direction towards the injection site, the point of the needle moves through the enclosure into the injection site as the sleeve collapses under the applied pressure and subsequently moves back through the enclosure as the sleeve reassumes its extended position on release of said pressure.
Dependencies are inferred from the claim text.