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Publication Number
US-10130756-B2
Publication Date
2018-11-20
Expiration Date
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.
Core Innovation
The invention relates to a syringe type pump in which a barrel is curved in a shape of a segment of a toroidal tube and contains a piston movable in the barrel. A connecting opening for the passage of fluid is located adjacent one end of the barrel, and a drive gear is provided to move the piston. A curved continuous and uninterrupted driving rod drives the piston through engagement with a gear rim included on the driving rod.
The driving rod includes a continuous and integral brace extending continuously and uninterrupted along a majority of a length of the driving rod, where the brace makes contact with the barrel curved in the shape of the segment of the toroidal tube. The brace is slidably supported in the barrel, and where the drive gear engages with the gear rim, the drive gear engages at a location where the continuous and integral brace is directly behind and contacting the continuous and uninterrupted driving rod.
A related device is described for injecting a fluid into a patient's body or retrieving body fluid therefrom using a curved, toroidal-tube-segment barrel with a lengthwise extending axis and a piston movable along the axis. The same curved continuous and uninterrupted driving rod concept is used, including the continuously extending integral brace contacting the toroidal-segment barrel and a gear rim interaction where the drive gear engages while the brace is directly behind and contacting the driving rod. The document further emphasizes self-adapting behavior against manufacturing-tolerance mismatch, while enabling injection and withdrawal modes with reduced dead volume in compact patient-wear configurations.
Claims Coverage
The partial document includes two independent claims that share the same core mechanical relationship: a toroidal-tube-segment barrel, a piston, and a curved continuous driving rod with a continuously extending integral brace that is slidably supported and positioned directly behind and contacting the driving rod at the gear-rim engagement.
Toroidal-tube-segment barrel with piston and adjacent connecting opening
A barrel curved in a shape of a segment of a toroidal tube; a connecting opening for the passage of fluid located adjacent one end of the barrel; and a piston movable in the barrel.
Curved continuous and uninterrupted driving rod with integral brace contacting the toroidal barrel
A curved continuous and uninterrupted 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.
Gear-rim engagement located where the brace is directly behind and contacting the driving rod
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.
Toroidal-tube-segment barrel device for injecting or retrieving body fluid
A device for injecting a fluid into a patient's body or retrieving body fluid therefrom comprising 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; and a piston movable along the axis and disposed in an interior of the barrel.
Reciprocating piston driven by curved continuous driving rod with contacting brace
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 the shape of the segment of the toroidal tube, the rod including a gear rim.
Gear-rim engagement positioned behind the contacting brace in the patient-fluid device
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.
Across the independent claims, the claim coverage centers on a syringe-type pump/device using a barrel curved as a segment of a toroidal tube, with piston movement driven by a curved continuous and uninterrupted driving rod. The driving rod carries a continuous and integral brace that contacts the toroidal barrel and is slidably supported, and the drive gear engagement with the gear rim is specified to occur where the brace is directly behind and contacting the driving rod.
Stated Advantages
Reduces manufacturing-tolerance mismatch problems.
Solves sealing/friction stick-slip problems associated with rigid arcuate-drive mechanisms.
Reduces blockage risks associated with rigid arcuate-drive mechanisms.
Enables both pushing (injection) and pulling (withdrawal) modes.
Supports compact patient-wear devices with minimal dead volume.
Documented Applications
A syringe-type pump/device for injecting a fluid into a patient's body.
A syringe-type device for retrieving body fluid from a patient's body.
A patient-wear device for injection fluid delivery and removal of analysis fluid, including configurations using at least two pumps connected to a dual-lumen intravenous catheter arrangement.
A patient interface/insertion mechanism that conceals/exposes a cannula and/or diagnostic probe using a flexible adhesive base plate and a two-position flexible cover concept.
Insertion of a cannula or diagnostic probe with an inserting mechanism that pierces protecting septums prior to insertion into the skin.
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