Piston assembly for syringe
First Claim
1. A syringe assembly comprising:
- a barrel of one of a cyclic olefin containing polymer anda bridged polycyclic olefin containing polymer, the barrel including an inner surface defining a chamber to contain flowable materials, the chamber having an opening; and
, an elastomeric piston slidably attached to the body and providing a seal of the chamber, the elastomeric piston having a parylene coating on an outer surface thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
A piston assembly (10) for a flowable materials container having a barrel (14) defining a fluid containing chamber (16). The barrel (14) is made of a body of a cyclic olefin containing polymer or a bridged polycyclic olefin containing polymer. An elastomeric piston (24) is slidably attached to the barrel (14) and provides a seal of the chamber. The piston (24) has a parylene coating on an outer surface thereof to reduce the necessary break away force. A plunger (22) is also provided and has a second mating member (42) removably connecting the plunger to a first mating member (44) of the piston. The first mating member (44) has a series of threads having a major diameter and a minor diameter, and the second mating member (42) has a series of threads having a major diameter and a minor diameter. The major and minor diameters of the second mating members (42) is appreciably smaller than the major and minor diameters of the other of the first mating member (44) to provide ease of connection.
105 Citations
19 Claims
-
1. A syringe assembly comprising:
-
a barrel of one of a cyclic olefin containing polymer anda bridged polycyclic olefin containing polymer, the barrel including an inner surface defining a chamber to contain flowable materials, the chamber having an opening; and
,an elastomeric piston slidably attached to the body and providing a seal of the chamber, the elastomeric piston having a parylene coating on an outer surface thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A piston assembly for use in a flowable materials container comprising:
-
a piston having a proximal end, a distal end, and a cavity extending into the piston at the proximal end thereof, wherein a first mating member is located in the cavity, and wherein the first mating member comprises one of a plurality of male and female threads, a plunger rod having a second mating member comprising the other of the plurality of male and female threads, wherein the first mating member engages the second mating member, and wherein a major diameter and a minor diameter of one of the first and second mating members is larger than the major diameter and minor diameter of the other of the first and second mating members. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
Specification