| 摘要 |
<p>An internal needle seat structure for a safe self-destructive syringe, characterized in that: provided at an internal needle seat body (1) is a needle tube base (3), and an elastic sealing position-limiting base (4) which is formed into an integral structure with the needle tube base (3); both can be formed into an integrally single-body structure or a split assembly structure; an annular step (7) or an annular slope is formed between the needle tube base (3) and the elastic sealing position-limiting base (4); the surface of the elastic sealing position-limiting base (4) is provided with an annular buffer gap (5); an annular sealing position-limiting engagement portion (6) is formed at the outer wall of the elastic sealing position-limiting base (4) outside the annular buffer gap (5); the product overcomes the defect arising from the properties of the material itself, the elastic buffer zone can ensure the bite force and sealing between the internal needle seat and cylinder neck, and the pulling force needed to pull back the internal needle seat during withdrawal of the internal needle seat can be decreased, so that the two key elements which are contradictory themselves can reach an optimal point of balance.</p> |
