US 12,329,942 B2
Injection head of needleless syringe, needleless syringe body and needleless syringe
Ming Zhang, Beijing (CN)
Assigned to BEIJING QS MEDICAL TECHNOLOGY CO., LTD., Beijing (CN)
Appl. No. 17/285,749
Filed by BEIJING QS MEDICAL TECHNOLOGY CO., LTD., Beijing (CN)
PCT Filed Nov. 10, 2020, PCT No. PCT/CN2020/127824
§ 371(c)(1), (2) Date Apr. 15, 2021,
PCT Pub. No. WO2021/218108, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 202010366995.9 (CN), filed on Apr. 30, 2020; and application No. 202010367033.5 (CN), filed on Apr. 30, 2020.
Prior Publication US 2023/0136095 A1, May 4, 2023
Int. Cl. A61M 5/30 (2006.01); A61M 5/31 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/30 (2013.01) [A61M 5/31515 (2013.01); A61M 2005/3128 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A needleless syringe body for use with an injection head comprising a medicine barrel (21) and a piston rod (22) having a piston (221) and a rod portion (222), and a vial, characterized in that the needleless syringe body (3) comprises:
a base (31) comprising a forward opening;
an outer housing (32) comprising a rearward opening and mounted at a front end of the base to form a receiving space between the base and the outer housing, the outer housing being provided with a front opening for fixedly mounting a medicine barrel;
an inner push rod (33) disposed within the receiving space and having a forward opening, the vial is fixedly received within the inner push rod, and the piston rod is configured to be fixed at the forward opening,
wherein the outer housing can move in a front-rear direction relative to the inner push rod to drive the medicine barrel to move in the front-rear direction relative to the vial and the piston rod, so as to implement medicine suctioning and injection.