US 12,415,037 B2
Needleless injection device and method using the same
Rongrong Wu, El Sobrante, CA (US); and Suheng Liu, Wuhan (CN)
Filed by Rongrong Wu, El Sobrante, CA (US); and Suheng Liu, Wuhan (CN)
Filed on Jan. 17, 2021, as Appl. No. 17/151,200.
Prior Publication US 2022/0226578 A1, Jul. 21, 2022
Int. Cl. A61M 5/30 (2006.01); A61M 5/24 (2006.01); A61M 5/31 (2006.01)
CPC A61M 5/30 (2013.01) [A61M 5/24 (2013.01); A61M 2005/2444 (2013.01); A61M 2005/2477 (2013.01); A61M 2005/3128 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A needleless injection device, comprising:
a housing;
a first slider disposed in the housing and movable along an axis;
a second slider disposed in the housing and movable along the axis;
an ampoule injection tube; and
a driving unit configured to move the first slider and the second slider in opposite directions along the axis, characterized in that the value of the combined momentum of the first slider and the second slider is substantially zero under the control of the driving unit,
wherein the driving unit further comprises:
a first electromagnet affixed inside the housing and disposed between the first slider and one end of the housing; and
a second electromagnet affixed inside the housing and disposed between the second slider and the other end of the housing, thereby the first slider and the second slider are disposed between the first electromagnet and the second electromagnet;
wherein the first slider comprises a first permanent magnetic core with a first connection rod configured to slide through a hollow center of the first electromagnet;
wherein a first buffer spring is disposed between the first permanent magnetic core and the first electromagnet;
wherein the second slider comprises a second permanent magnetic core connected to a center injection shaft through a hollow center of the second electromagnet; and
wherein a second buffer spring is disposed between the second permanent magnetic core and the second electromagnet.