| 摘要 |
<p>Disclosed is a needle base for a pulled-back fixed-needle safe self-destroying syringe, comprising an elastic cushioning upper needle base (1) located at the upper part and a lower needle base (2) located at the lower part, wherein the upper part of the elastic cushioning upper needle base (1) forms a needle tube-assembling column (3) and the lower part of the elastic cushioning upper needle base (1) is cylindrical; an annular elastic sealing limiting ring body (4) is formed at the outer wall of the lower part of the elastic cushioning upper needle base (1); an annular elastic cushioning gap (5) is formed between the inner wall of the elastic sealing limiting ring body (4) and the outer part of the lower part of the elastic cushioning upper needle base (1); a connection portion (6) is formed between the lower part of the elastic sealing limiting ring body (4) and the outer wall of the lower part of the elastic cushioning upper needle base (1); and an annular reverse step (7) is formed at the elastic cushioning upper needle base (1) located at the lower part of the connection portion (6). The needle base structure is rational in structure, simple in operation and use, stable in working conditions, and has the characteristics of safety and practicality.</p> |
