US 9,808,584 B2
Elastic cap and syringe assembly therewith
Masafumi Takemoto, Fujinomiya (JP)
Assigned to TERUMO KABUSHIKI KAISHA, Tokyo (JP)
Filed by TERUMO KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 16, 2016, as Appl. No. 15/353,438.
Application 15/353,438 is a continuation of application No. 14/641,019, filed on Mar. 6, 2015, granted, now 9,545,485.
Application 14/641,019 is a continuation of application No. PCT/JP2013/058827, filed on Mar. 26, 2013.
Prior Publication US 2017/0056599 A1, Mar. 2, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 5/32 (2006.01); A61M 5/34 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/3202 (2013.01) [A61M 5/3134 (2013.01); A61M 5/343 (2013.01); A61M 2205/0216 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A syringe assembly comprising:
a barrel assembly comprising:
a cylindrical barrel body having an opening at a base end;
a barrel tip portion having an annular head and being disposed at an end of the barrel body; and
a puncture needle having a needle hole and being held in the barrel tip portion such that a tip of the puncture needle projects from the barrel tip portion; and
an elastic cap that is detachably mountable to the barrel tip portion of the barrel assembly, the elastic cap comprising:
a closed bottom wall at a distal end of the elastic cap,
an open end portion at a proximal end of the elastic cap,
a side wall extending from the bottom wall toward the open end portion, and
a cylindrical receiving hole formed by the bottom wall, the side wall, and the open end portion, the receiving hole being configured to receive at least part of the barrel tip portion and the puncture needle,
wherein the bottom wall has a base end surface that faces the receiving hole, and
wherein the receiving hole includes:
a first inner diameter portion having an inner diameter that is smaller than an outer diameter of the annular head;
a stopper portion disposed at a distal end of the first inner diameter portion; and
a second inner diameter portion that extends from the stopper portion to said base end surface, an inner diameter of the second inner diameter portion being smaller than the inner diameter of the first inner diameter portion,
wherein a minimum of the inner diameter of the second inner dinner portion is twice or greater than an outer diameter of the puncture needle,
wherein the elastic cap is configured such that, upon attachment to the barrel tip portion, at least part of the barrel tip portion is inserted into the receiving hole, the first inner diameter portion is in close contact with an outer peripheral surface of the annular head such that an airtight seal is formed between the first inner diameter portion and the barrel tip portion, the stopper portion abuts a distal end face of the annular head such that the stopper portion defines a final insertion position of the barrel tip portion, and the tip of the puncture needle penetrates the bottom wall through the base end surface of the bottom wall such that the bottom wall seals the tip of the puncture needle.