Drive for syringe pump
First Claim
1. A drive for a syringe having at least one barrel and plunger assembly, which drive comprises:
- an electric motor having a housing, a rotatable armature within said housing and an axial shaft extending therefrom and having a portion thereof which is threaded and which is received through a threaded member fixed to said armature;
a first holder that is fixed relative to the electric motor housing;
guide means that is fixed relative to said first holder and including a track extending parallel to said shaft for guiding a portion of said drive;
a second holder rigidly fixed to said shaft and slidable along said track;
said guide means preventing rotational but not axial movement of said shaft upon sliding movement of said second holder fixed to said shaft on said track;
said track including two elongate members fixed relative to the electric motor housing, said members being parallel spaced from each other and said shaft, and being positioned on either side of said shaft;
means for connecting one of the barrel and the plunger with said first holder;
means for connecting the other of the barrel and the plunger to said second holder; and
means for coupling the electric motor to a source of current whereby energization of the electric motor will provide non-rotational axial travel of said shaft thereby causing relative movement between the syringe plunger and the syringe barrel.
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Accused Products
Abstract
An improved drive is provided for a syringe having a barrel and a plunger. The drive utilizes an electric motor which has an axial shaft that moves back and forth axially when the shaft is prevented from rotating. A syringe barrel holder is fixed relative to the electric motor housing and a plunger holder is rigidly fixed to the shaft. When the electric motor is energized, the plunger holder will move back and forth relative to the syringe barrel holder. A plurality of switches for controlling the electric motor are positioned in fixed locations relative to the motor housing. The plunger holder is operative to actuate and deactuate the switches during axial travel of the shaft.
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Citations
11 Claims
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1. A drive for a syringe having at least one barrel and plunger assembly, which drive comprises:
- an electric motor having a housing, a rotatable armature within said housing and an axial shaft extending therefrom and having a portion thereof which is threaded and which is received through a threaded member fixed to said armature;
a first holder that is fixed relative to the electric motor housing;
guide means that is fixed relative to said first holder and including a track extending parallel to said shaft for guiding a portion of said drive;
a second holder rigidly fixed to said shaft and slidable along said track;
said guide means preventing rotational but not axial movement of said shaft upon sliding movement of said second holder fixed to said shaft on said track;
said track including two elongate members fixed relative to the electric motor housing, said members being parallel spaced from each other and said shaft, and being positioned on either side of said shaft;
means for connecting one of the barrel and the plunger with said first holder;
means for connecting the other of the barrel and the plunger to said second holder; and
means for coupling the electric motor to a source of current whereby energization of the electric motor will provide non-rotational axial travel of said shaft thereby causing relative movement between the syringe plunger and the syringe barrel. - View Dependent Claims (2, 3, 4, 10)
- an electric motor having a housing, a rotatable armature within said housing and an axial shaft extending therefrom and having a portion thereof which is threaded and which is received through a threaded member fixed to said armature;
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5. A drive for a syringe having at least one barrel and plunger assembly, which drive comprises:
- an electric motor having a housing, a rotatable armature within said housing and an axial shaft extending therefrom and having a portion there which is threaded and which is received through a threaded member fixed to said armature;
a syringe barrel holder that is fixed relative to the electric motor housing;
guide means that is fixed relative to said said syringe barrel holder and including a track extending parallel to said shaft for guiding a portion of said drive;
a plunger holder rigidly fixed to said shaft and slidable along said track;
said guide means preventing rotational but not axial movement of said shaft upon sliding movement of said plunger holder fixed to said shaft on said track;
said track including two elongate members fixed relative to the electric motor housing, said members being parallel spaced from each other and said shaft, and being positioned on either side of said shaft;
means for engaging the barrel of a syringe with said syringe barrel holder; and
means for connecting the plunger of the syringe to said plunger holder, whereby energization of the electric motor will provide non-rotational axial travel of said shaft thereby moving the syringe plunger axially. - View Dependent Claims (6, 7, 8, 9, 11)
- an electric motor having a housing, a rotatable armature within said housing and an axial shaft extending therefrom and having a portion there which is threaded and which is received through a threaded member fixed to said armature;
Specification