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US RE49,516 E1Granted
Syringe and method for assembling it
AssigneeGuerbet
InventorJérôme Caclin
Life of this patent
Estimating the term…
Abstract
A syringe comprising: a body delimiting a chamber; a piston able to slide in the chamber of the body along a longitudinal axis of the syringe, wherein the piston comprises a rod, a head, and a finger rest, which are all in one piece; and a deformable retention device designed to prevent the piston from leaving the body entirely, wherein the retention device is force-fitted in the chamber, extends around the piston over an angular sector strictly greater than 180° when it is in the assembled position, and has protruding external ribs which extend parallel to the longitudinal axis and are plastically deformable when the retention device is assembled in the chamber.
Claims30
A syringe comprising:
- a body delimiting a chamber;
- a piston able to slide in the chamber of the body along a longitudinal axis of the syringe, the piston comprising a rod, a head and a finger rest, which are all in one piece, the head of the piston having a diameter that is sealingly received in a diameter of the chamber;
- and
- a retention device that is deformable,
- wherein the retention device is force-fitted assembled in the chamber,
- wherein the retention device extends around the rod of the piston over an angular sector strictly greater than 180° when the retention device is assembled in the chamber, wherein the retention device is designed to come in contact with the head of the piston to prevent the piston from leaving the body entirely when the retention device is assembled in the chamber,
- wherein when the retention device is assembled in the chamber, the retention device has a passage into which the rod is received and into which the rod is axially movable for any angular position of the piston around the longitudinal axis, and
- wherein the retention device has no arrangement locking the retention device into a fixed closed ring form but comprises two C-shaped parts connected to each other by a thinned area which is deformable and which induces a spring effect between the C-shaped parts so as to make the retention device exert a radial force towards outside of the body when the retention device is assembled in the chamber,
- wherein the retention device has protruding external ribs, which extend parallel to the longitudinal axis and which are plastically deformable when the retention device is assembled in the chamber, and
- wherein the retention device excluding the external ribs has a maximum transverse outside dimension that is less than the diameter of the chamber when the retention device is assembled in the chamber.
7 more elements
A syringe comprising:
- a body delimiting a chamber;
- a piston able to slide in the chamber of the body along a longitudinal axis of the syringe, the piston comprising a rod, a head and a finger rest, which are all in one piece, the head of the piston having a diameter that is sealingly received in a diameter of the chamber;
- and
- a retention device that is deformable,
- wherein the retention device is force-fitted assembled in the chamber,
- wherein the retention device extends around the rod of the piston over an angular sector strictly greater than 180° when the retention device is assembled in the chamber,
- wherein the retention device has a surface which is perpendicular to the longitudinal axis, which has a closed ring shape and which is designed to come in contact with the head to prevent the piston from leaving the body entirely when the retention device is assembled in the chamber, and
- wherein the retention device comprises two C-shaped parts connected to each other by a thinned area that is deformable,
- wherein the retention device has protruding external ribs, which extend parallel to the longitudinal axis and which are plastically deformable when the retention device is assembled in the chamber, and
- wherein the retention device excluding the external ribs has a maximum transverse outside dimension that is less than the diameter of the chamber when the retention device is assembled in the chamber.
7 more elements
A method for assembling a syringe,
- the syringe comprising:
- a body delimiting a chamber;
- a piston able to slide in the chamber along a longitudinal axis of the syringe, the piston comprising a rod, a head and a finger rest, which are all in one piece the head of the piston having a diameter that is sealingly received in a diameter of the chamber;
- and
- a retention device that is deformable,
- wherein the retention device is force-fitted assembled in the chamber,
- wherein the retention device extends around the rod of the piston over an angular sector strictly greater than 180° when the retention device is assembled in the chamber, wherein the retention device is designed to come in contact with the head of the piston to prevent the piston from leaving the body entirely when the retention device is assembled in the chamber,
- wherein when the retention device is assembled in the chamber, the retention device has a passage into which the rod is received and into which the rod is axially movable for any angular position of the piston around the longitudinal axis,
- wherein the retention device comprises two C-shaped parts connected to each other by a thinned area that is deformable,
- wherein the retention device has protruding external ribs, which extend parallel to the longitudinal axis and which are plastically deformable when the retention device is assembled in the chamber, and
- wherein the retention device excluding the external ribs has a maximum transverse outside dimension that is less than the diameter of the chamber when the retention device is assembled in the chamber,
- and the method comprising:
- (a) deforming the thinned area to move the two C-shaped parts away from each other and then to move the two C-shaped parts toward each other so as to mount the retention device around the rod;
- (b) inserting the piston with the retention device mounted around the rod in the chamber;
- and
- (c) force fitting the retention device in the chamber.
13 more elements
Dependencies are inferred from the claim text.