US 5,632,730 A · Fluid injector

Abstract

An injector to deliver a variable dose into a living creature, such as an animal, the injector having a mounting element with an elongated, straight handle to be gripped by the user, a cylinder fixed to the mounting element, a piston movably associated within the cylinder to define a variable volume working space, a tube connected to the piston and fluidly connected to the space through the piston, a needle fluidly communicating with the space, check valves controlling the flow of fluid, a pad associated with the needle and the mounting element, the pad having a face with an oblique angle of engagement with the animal, the piston movable to a cocked position by the tube where it is retained until automatically released upon said pad contacting the animal and being moved toward the body, and thereby permitting the needle to be inserted into the animal, the pad engaging a latch binding the tube in the cocked position for releasing the tube and piston for passage of fluid from the space through the needle, a pawl for holding the latch in a non-tube binding position until a full dose of fluid has been ejected through the needle and further ensuring full needle penetration, and an element connected to the tube for engagement with the handle for varying the amount of the working space.

Claims16

Dependent claims

A fluid injector to deliver a required dose into an animal or other living creature, comprising:

means forming a handle;
means forming a fluid delivery tube connected to said handle means, said delivery tube movable relative to said handle means;
means forming a cylinder fluidly connected to said fluid delivery tube;
a piston movably disposed within said cylinder and fluidly connected to said delivery tube, said piston forming a volume working space within said cylinder, said piston movable with said delivery tube;
valve means interposed in said cylinder and said piston for controlling the flow of fluid into and out of said cylinder space;
a needle fluidly connected to said cylinder for transmitting fluid from said cylinder space;
said piston and said delivery tube movable between a cocked position wherein fluid is drawn into said working space, and a rest position;
and
latch means connected to said delivery tube and movable between a position retaining said delivery tube against movement out of said cocked position, and a position releasing said delivery tube for movement to said rest position, wherein said piston is moved within said cylinder to force fluid out of said working space and through said needle for ejection, therefrom.

6 more elements

A fluid injector to deliver a required dose into an animal or other living creature, comprising:

a hollow cylinder having a forward end and a rear end;
a needle fixed to said cylinder at said forward end and fluidly connected thereto;
a mounting element secured to the rear of said cylinder;
an animal contact pad connected to said mounting element for movement longitudinally of said cylinder, said needle extendable through said pad;
a piston mounted within and cooperating with said cylinder to define a variable volume working space therein;
an elongated hollow delivery tube extended through said mounting element and into a fluid connection with said piston for delivering a supply of fluid through said piston for entry into said cylinder, said piston being longitudinally movable within said cylinder between a rest position defining a minimum volume for said space and a rear cocked position defining a maximum volume for said space, said delivery tube being movable with said piston;
an elongated handle extended alongside said delivery tube;
a first spring engaging said piston for biasing said piston from said cocked position toward said rest position;
a latch movable between a first position retaining said delivery tube in said cocked position and a second position releasing said tube to the bias of said first spring;
a second spring for biasing said latch into said first position;
and
a rod unit connected to said pad and extended through said mounting element and operable upon engagement of said pad with an animal to be injected to move longitudinally of said cylinder to a retracted position to move said latch against the bias of said second spring into said second position for releasing said delivery tube from said cocked position for moving said piston to force fluid from within said cylinder and through said needle for discharge therefrom.

9 more elements

Dependencies are inferred from the claim text.

Fluid injector

Life of this patent

Fluid injector

Life of this patent

Abstract

Claims16