Patent ID: 11969744
Assignee: SHENZHEN BONA PHARMA TECHNOLOGY CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC A  B | IPC A  B

Claim 3:
4. The sterile spray pump as in claim 3, wherein the main piston (30) includes a first sealing ring (305) at the upper end of the main inner ring portion (303) and a second sealing ring (306) at an upper end of the main outer ring portion (304), the first sealing ring (305) is in sealing connection with an outer peripheral surface of the secondary inner ring portion (504), and the second sealing ring (306) is in sealing connection with an outer peripheral surface of the secondary outer ring portion (505); the first exhaust member (502) comprises at least two first convex ribs fixedly provided on the outer peripheral surface of the secondary inner ring portion (504) and arranged in a circumferential direction of the secondary inner ring portion (504), and a first exhaust channel formed between two adjacent first convex ribs; the second exhaust member (503) comprises at least two second convex ribs fixedly provided on the outer peripheral surface of the secondary outer ring portion (505) and arranged in a circumferential direction of the secondary outer ring portion (505), and a second exhaust channel formed between two adjacent second convex ribs; and after the spray head (40) is pressed down, the first convex ribs push the first sealing ring (305) open to make the first compression space (10) communicate with the main liquid suction cavity (301) through the first exhaust channel, and the second convex ribs push the second sealing ring (306) to make the second compression space (20) communicate with the exterior of the sterile spray pump through the second exhaust channel.