US 11,904,142 B2
Needleless injection syringe
Min Su Cho, Incheon (KR)
Filed by Min Su Cho, Incheon (KR)
Filed on Jun. 18, 2020, as Appl. No. 16/904,873.
Application 16/904,873 is a continuation of application No. PCT/KR2018/015674, filed on Dec. 11, 2018.
Claims priority of application No. 10-2017-0174701 (KR), filed on Dec. 19, 2017; and application No. 10-2018-0157787 (KR), filed on Dec. 10, 2018.
Prior Publication US 2020/0316302 A1, Oct. 8, 2020
Int. Cl. A61M 5/30 (2006.01); A61M 5/20 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/30 (2013.01) [A61M 5/2033 (2013.01); A61M 5/31586 (2013.01); A61M 2005/202 (2013.01); A61M 2005/2073 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A needleless injector comprising:
a cylinder housing;
a loading lever having a working arm part having a lever shaft, which is rotatably coupled to a rear end portion of the cylinder housing, formed at one end portion and a handle part extending from the other end portion of the working arm part by being bent at a predetermined angle so that the handle part is rotatable to a folded position where the handle part lies on the cylinder housing;
a towing member inserted inside the cylinder housing;
a link having one end portion spaced apart from the lever shaft and pin-coupled to the working arm part and the other end portion pin-coupled to the towing member so that the towing member is able to slide back and forth inside the cylinder housing according to a rotation of the loading lever;
an inner cylinder inserted inside the cylinder housing so as to be able to slide back and forth and having a rear end portion integrally coupled to the towing member, a front end portion configured to be closed by a stopper having a passage formed therein, and a slit extending rearward from the front end portion;
a spring inserted inside the inner cylinder;
an actuating head inserted inside the inner cylinder so as to be able to slide back and forth in front of the spring and having a catching protrusion configured to be inserted into the slit; and
a trigger means coupled to an outer side of the cylinder housing and having a stopper head part configured to pass through the cylinder housing so as to be able to be inserted into the slit of the inner cylinder and detached from the slit,
wherein the cylinder housing has a cut section extending forward from the rear end portion to which the lever shaft is coupled,
movements of the working arm part and the link according to the rotation of the loading lever occur through the cut section, and
at the folded position of the handle part, the working arm part is at least partially accommodated in the cylinder housing through the cut section, and the link is completely accommodated in the cylinder housing through the cut section.