Computer controlled electric syringe
First Claim
1. A computer controlled electric syringe comprising:
- a piston unit comprising;
a piston comprising a first end, a second end and a hollow portion communicating with an opening formed at the first end, the piston being configured to press and move a rubber plug of a cartridge, in which a medicinal solution is enclosed, by the second end to discharge the medicinal solution from the cartridge through an injection needle;
a ball screw comprising a screw shaft and a nut portion that is screwed into the screw shaft, the screw shaft being loosely inserted into the hollow portion of the piston through the opening, the nut portion being coupled to the piston;
a screw shaft supporting portion rotatably supporting the screw shaft of the ball screw;
a rotation preventing portion configured to prevent the nut portion of the ball screw from being rotated; and
a piston supporting portion supporting the piston to be movable in an axial direction of the screw shaft along with the nut portion by the rotation of the screw shaft.
1 Assignment
0 Petitions
Accused Products
Abstract
A computer controlled electric syringe includes: a piston unit including a piston being configured to press and move a rubber plug of a cartridge by a second end to discharge a medicinal solution from a cartridge through an injection needle; a ball screw having a screw shaft and a nut portion that is screwed into the screw shaft, the screw shaft being loosely inserted into the hollow portion of the piston through the opening, the nut portion being coupled to the piston; a screw shaft supporting portion rotatably supporting the screw shaft of the ball screw; a rotation preventing portion configured to prevent the nut portion of the ball screw from being rotated; and a piston supporting portion supporting the piston to be movable in an axial direction of the screw shaft along with the nut portion by the rotation of the screw shaft.
13 Citations
20 Claims
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1. A computer controlled electric syringe comprising:
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a piston unit comprising; a piston comprising a first end, a second end and a hollow portion communicating with an opening formed at the first end, the piston being configured to press and move a rubber plug of a cartridge, in which a medicinal solution is enclosed, by the second end to discharge the medicinal solution from the cartridge through an injection needle; a ball screw comprising a screw shaft and a nut portion that is screwed into the screw shaft, the screw shaft being loosely inserted into the hollow portion of the piston through the opening, the nut portion being coupled to the piston; a screw shaft supporting portion rotatably supporting the screw shaft of the ball screw; a rotation preventing portion configured to prevent the nut portion of the ball screw from being rotated; and a piston supporting portion supporting the piston to be movable in an axial direction of the screw shaft along with the nut portion by the rotation of the screw shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A syringe comprising:
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a piston having an opening communicating to a hollow interior portion; a ball screw comprising a screw shaft which has a threaded outer periphery, the screw shaft being insertable into the hollow portion of the piston though the opening of the piston; a nut portion which rotates relative to the screw shaft, and is threaded to the screw shaft and coupled to the piston at the opening of the piston; a screw shaft supporting portion rotatably supporting the screw shaft of the ball screw, at an end of the piston nearest the opening; a rotation preventing portion comprising a protruding portion and a sliding passage, the protruding portion being fixed to the nut portion and the sliding passage being formed in a bottom base, the protruding portion being configured to move only inside the sliding passage such that the nut portion and the piston, coupled to the nut portion, move only in an axial direction; a piston supporting portion which supports the piston so that the piston is movable in the axial direction, and which is positioned at an opposite end of the piston than the opening; a cartridge holder socket having a hollow interior in axial alignment with the piston; and a cartridge holder being detachable connected to the cartridge holder socket.
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Specification