Injector head for medical use
First Claim
1. An injector head for medical use having a syringe attached thereto, the syringe including a cylindrical body portion having an inject portion and an opening portion respectively at a front end side and a rear end side and including a piston defining an internal space for sucking in contrast medium to be injected to a patient and provided movably between the front end side and the rear end side of said body portion, comprising:
- a plunger having its front end portion coupled to said piston, capable of reciprocating in a direction of movement of said piston, and restrained from rotating on its axis;
first drive means provided at a rear end side of said plunger for reciprocating said plunger;
a mechanical stopper through which said plunger passes, provided such that it is capable of moving along the axis of said plunger and is restrained from rotating on the axis of said plunger;
move and fix means for moving said mechanical stopper along the axis of said plunger and fixing it at an arbitrary position by engaging with said mechanical stopper while rotating on the axis of said plunger;
second drive means for rotating said move and fix means;
a position plate provided at the rear end side of said plunger to the rear of said mechanical stopper for preventing said plunger from moving by contacting with said mechanical stopper when said plunger moves to the front end side; and
a frame for supporting said plunger, said first drive means, said mechanical stopper, said move and fix means, and said position plate.
1 Assignment
0 Petitions
Accused Products
Abstract
An injector head for medical use is provided with a position plate serving as both the position plate and a nut, placed at a rear end portion of a plunger, as well as a screw axis engaging with the position plate. A mechanical stopper which can slide only in a direction of an axis of the plunger is provided to the plunger. A female thread is formed on the surface of the mechanical stopper. A main body portion is provided which accommodates the mechanical stopper, the plunger, and the position plate and has a male thread formed on its inner surface and screwed together with the female thread. By utilizing this structure, an injector head for medical use can be provided which is scaled down and simplified while keeping its mechanical safety mechanism.
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Citations
8 Claims
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1. An injector head for medical use having a syringe attached thereto, the syringe including a cylindrical body portion having an inject portion and an opening portion respectively at a front end side and a rear end side and including a piston defining an internal space for sucking in contrast medium to be injected to a patient and provided movably between the front end side and the rear end side of said body portion, comprising:
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a plunger having its front end portion coupled to said piston, capable of reciprocating in a direction of movement of said piston, and restrained from rotating on its axis; first drive means provided at a rear end side of said plunger for reciprocating said plunger; a mechanical stopper through which said plunger passes, provided such that it is capable of moving along the axis of said plunger and is restrained from rotating on the axis of said plunger; move and fix means for moving said mechanical stopper along the axis of said plunger and fixing it at an arbitrary position by engaging with said mechanical stopper while rotating on the axis of said plunger; second drive means for rotating said move and fix means; a position plate provided at the rear end side of said plunger to the rear of said mechanical stopper for preventing said plunger from moving by contacting with said mechanical stopper when said plunger moves to the front end side; and a frame for supporting said plunger, said first drive means, said mechanical stopper, said move and fix means, and said position plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification