US 11,944,746 B2
Fluid delivery apparatus
Chiu-Ju Shen, Taoyuan (TW); Po Chuan Chen, Taoyuan (TW); and Jo Ling Wu, Taoyuan (TW)
Assigned to MICROBASE TECHNOLOGY CORP., Taoyuan (TW)
Appl. No. 16/759,739
Filed by MICROBASE TECHNOLOGY CORP., Taoyuan (TW)
PCT Filed Nov. 5, 2018, PCT No. PCT/CN2018/114010
§ 371(c)(1), (2) Date Apr. 28, 2020,
PCT Pub. No. WO2019/086036, PCT Pub. Date May 9, 2019.
Claims priority of provisional application 62/581,796, filed on Nov. 6, 2017.
Prior Publication US 2021/0369990 A1, Dec. 2, 2021
Int. Cl. A61M 15/00 (2006.01); A61M 11/00 (2006.01)
CPC A61M 15/0065 (2013.01) [A61M 11/007 (2014.02); A61M 2202/0468 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A fluid delivery apparatus, comprising:
a first piston body having a first through hole and a first connecting portion, wherein the first through hole extends from one end of the first connecting portion to an opposite end of the first connecting portion, and the first connecting portion has an accommodation space and a buffer space communicable to the accommodation space, wherein the accommodation space is defined by a side surface of the first connecting portion and a supporting surface of the first connecting portion that is substantially perpendicular to the side surface, and the buffer space is located at a distal end of the first connecting portion and the accommodation space is located at a proximal end of the first connecting portion;
a second piston body in contact with the first piston body and having a second through hole and a second connecting portion, wherein the second through hole extends from one end of the second connecting portion to an opposite end of the second connecting portion, and at least part of the second connecting portion is disposed inside the accommodation space;
a fluid delivery pipe, accommodated in the first through hole and the second through hole, and moveable between a first position and a second position; and
a sealing element encircling the fluid delivery pipe,
wherein when the fluid delivery pipe is at the first position, the sealing element is substantially accommodated in the accommodation space, and when the fluid delivery pipe is disposed at the second position, resulting from its movement towards the first piston body, a first part of the sealing element is accommodated in the accommodation space, and a second part of the sealing element is accommodated in the buffer space.