Syringe type pump
First Claim
1. A syringe type pump comprising:
- a barrel curved in a shape of a segment of a toroidal tube,a connecting opening for the passage of fluid, the connecting opening located adjacent one end of the barrel,a drive gear,a piston movable in the barrel; and
a curved continuous and uninterrupted driving rod, the driving rod to move the piston, the driving rod including a continuous and integral brace extending continuously and uninterrupted along a majority of a length of the driving rod and making contact with the barrel curved in the shape of the segment of the toroidal tube, the brace being slidably supported in the barrel, the rod including a gear rim,wherein wherever the drive gear engages with the gear rim of the driving rod to move the rod and the piston, the drive gear engages with the gear rim where the continuous and integral brace is directly behind and contacting the continuous and uninterrupted driving rod.
1 Assignment
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Accused Products
Abstract
In a syringe type pump with a barrel (2) and a piston (4) movable in the interior of the barrel the barrel has the shape of a segment of a toroidal tube (2) and the piston is moved by means of a driving rod (6) which is guided and supported by the inner surface of the barrel wall. By the toroidal shape the overall size of the pump is significantly reduced and by guiding and supporting the driving rod of the piston by the inner surface of the barrel wall intrinsic problems of tightness, stick-slip phenomena and blockage are solved. A device for injecting fluid into a patient'"'"'s body or removing body fluid therefrom is using a syringe type pump with a toroidal barrel and a driving rod of the piston guided and supported by the inner surface of the barrel wall.
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Citations
19 Claims
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1. A syringe type pump comprising:
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a barrel curved in a shape of a segment of a toroidal tube, a connecting opening for the passage of fluid, the connecting opening located adjacent one end of the barrel, a drive gear, a piston movable in the barrel; and a curved continuous and uninterrupted driving rod, the driving rod to move the piston, the driving rod including a continuous and integral brace extending continuously and uninterrupted along a majority of a length of the driving rod and making contact with the barrel curved in the shape of the segment of the toroidal tube, the brace being slidably supported in the barrel, the rod including a gear rim, wherein wherever the drive gear engages with the gear rim of the driving rod to move the rod and the piston, the drive gear engages with the gear rim where the continuous and integral brace is directly behind and contacting the continuous and uninterrupted driving rod. - View Dependent Claims (2, 3, 4, 5, 18)
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6. A device for injecting a fluid into a patient'"'"'s body or retrieving body fluid therefrom, comprising:
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a barrel curved in a shape of a segment of a toroidal tube with a lengthwise extending axis; a connecting passage at an end of the barrel; a drive gear; a piston movable along the axis and disposed in an interior of the barrel; and a curved continuous and uninterrupted driving rod for reciprocally moving the piston, the driving rod including a brace extending continuously and uninterrupted along a majority of a length of the driving rod and making contact with the barrel curved in a shape of the segment of the toroidal tube, the rod including a gear rim, wherein wherever the drive gear engages with the gear rim of the driving rod to move the rod and the piston, the drive gear engages with the gear rim where the continuous and integral brace is directly behind and contacting the continuous and uninterrupted driving rod. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19)
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Specification