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

Claim 2:
3. The sterile spray pump as in claim 1, wherein the main piston (30) includes a main inner ring portion (303) and a main outer ring portion (304) located at an outer peripheral side of the main inner ring portion (303); the secondary piston (50) includes a secondary inner ring portion (504) and a secondary outer ring portion (505) located at an outer peripheral side of the secondary inner ring portion (504); an upper end of the main inner ring portion (303) extends between the secondary outer ring portion (505) and the secondary inner ring portion (504), and the first compression space (10) is formed between the main inner ring portion (303), the secondary outer ring portion (505) and the secondary inner ring portion (504); and a lower end of the secondary outer ring portion (505) extends between the main inner ring portion (303) and the main outer ring portion (304), and the second compression space (20) is formed between the secondary outer ring portion (505), the main inner ring portion (303) and the main outer ring portion (304).