Absorbable Iron-Based Instrument

Abstract

Disclosed is an absorbable iron-based instrument (10). The absorbable iron-based instrument includes an iron-based matrix (100), a zinc-containing protective layer (200), a corrosion-promoting layer (300) and a drug controlled-release layer (400); the iron-based matrix (100) is provided with an outer wall (110), an inner wall (120) and a side wall (130); the zinc-containing protective layer (200) covers at least the outer wall (110) and the inner wall (120) of the iron-based matrix (100); the corrosion-promoting layer (300) fully covers the zinc-containing protective layer (200); the drug controlled-release layer (400) partially covers at least the corrosion-promoting layer (300); the corrosion-promoting layer (300) and the drug controlled-release layer (400) each contain degradable polymers; the weight-average molecular weight of the degradable polymers in the corrosion-promoting layer (300) is greater than the weight-average molecular weight of the degradable polymers in the drug controlled-release layer (400); and the thickness ratio of a portion of the zinc-containing protective layer (200) that is located at the inner wall (120) to a portion of the corrosion-promoting layer (300) that is located at the inner wall (120) is greater than the thickness ratio of a portion of the zinc-containing protective layer (200) that is located at the outer wall (110) to a portion of the corrosion-promoting layer (300) that is located at the outer wall (110). The corrosion behavior of the absorbable iron-based instrument (10) meets the requirements of clinical use, and the occurrence of adverse histological reactions is rare or avoided.

Dependencies are inferred from the claim text.