Non-reusable syringe adapted rod-and-piston unit and method for assembling such syringe
First Claim
1. A method of assembling a syringe which, when assembled, includes a rod which is intended to move reciprocatingly in relation to a syringe tube, one end of which is comprised of or can coact with a needle, a piston which can coact with the rod, and means for connecting and disconnecting the piston to and from the rod respectively, comprising the steps of:
- positioning an integral rod-and-piston unit so that an extension of a center line on the rod and the piston substantially coincides with an extension of a center line on the syringe tube;
inserting the integral rod-and-piston unit into the syringe tube;
separating the rod from the piston within the syringe tube; and
bringing the means for connecting and disconnecting the piston to and from the rod to a unit connecting position;
wherein the separating step includes separating said rod and piston with the aid of a separate device.
4 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a rod-and/or piston unit that can be enclosed in a container forming part of a non-reusable syringe where the rod and the piston have means for connecting the piston to the rod and disconnecting the piston therefrom. The piston and the rod are manufactured as one piece in a die or similar. The invention also relates to a method for assembling a syringe.
34 Citations
17 Claims
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1. A method of assembling a syringe which, when assembled, includes a rod which is intended to move reciprocatingly in relation to a syringe tube, one end of which is comprised of or can coact with a needle, a piston which can coact with the rod, and means for connecting and disconnecting the piston to and from the rod respectively, comprising the steps of:
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positioning an integral rod-and-piston unit so that an extension of a center line on the rod and the piston substantially coincides with an extension of a center line on the syringe tube; inserting the integral rod-and-piston unit into the syringe tube; separating the rod from the piston within the syringe tube; and bringing the means for connecting and disconnecting the piston to and from the rod to a unit connecting position; wherein the separating step includes separating said rod and piston with the aid of a separate device. - View Dependent Claims (2, 3, 4, 5)
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6. A method of assembling a syringe which, when assembled, includes a rod which is arranged for reciprocating movement relative to a syringe tube, one end of which is comprised of or can coact with a needle, a piston which coacts with said rod, and means for connecting and disconnecting the piston to and from the rod, comprising the steps:
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positioning an integrated rod-and-piston unit to enable said rod and piston to be separated from one another; positioning the separated rod and piston so that a center line on the rod and on the piston substantially coincides with an extension of a center line on the syringe tube; inserting the rod and piston into the syringe tube; and bringing the means for connecting and disconnecting the piston to and from the rod to a unit connecting position; wherein the rod and piston are separated with the aid of a separate device. - View Dependent Claims (7, 8, 9)
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10. A method of assembling a syringe which, when assembled, includes a rod which is arranged for reciprocating movement relative to a syringe tube, one end of which is comprised of or can coact with a needle, a piston which coacts with said rod, and means for connecting and disconnecting the piston to and from the rod, comprising the steps:
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positioning an integrated rod-and-piston unit to enable said rod and piston to be separated from one another; positioning the separated rod and piston so that a center line on the rod and on the piston substantially coincides with an extension of a center line on the syringe tube; inserting the rod and piston into the syringe tube; and bringing the means for connecting and disconnecting the piston to and from the rod to a unit connecting position; wherein the rod and piston are separated by exerting pressure on the rod in the direction of said center line; wherein the rod and piston are separated with the aid of an ultrasonic unit. - View Dependent Claims (14, 15, 16, 17)
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11. A method of assembling a rod and piston unit for a syringe, comprising the steps of:
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forming a one-piece unit that includes a piston, a rod, and a joining element that integrally connects said piston to said rod, wherein said piston and said rod include means for connecting and disconnecting the piston and the rod; destroying the joining element to separate the piston from the rod; and connecting the piston to the rod with the connecting and disconnecting means. - View Dependent Claims (12)
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13. A unit adapted for insertion into a container included in a syringe intended for one-time use only, comprising:
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a rod-unit and a piston-unit, wherein the rod-unit and the piston-unit include means for connecting and disconnecting the rod-unit to and from the piston-unit, a joining element between the rod-unit and the piston-unit, the rod-unit and the piston-unit are joined together along the joining element in the form of a single integral rod-piston unit which has been produced in a mold or like tool; wherein the rod-unit is joined to the piston-unit by means of the joining element which is formed by mutually joined and mutually facing outer corner parts of the connecting and disconnecting means; wherein the corner parts mutually connect with said joining element, this connection being achieved by providing in said mold a gap in which molding material will flow; and wherein the joining element is adapted to enable the joining element to be broken when separating the rod-unit and the piston-unit.
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Specification