Zinc-Containing Medical Instrument

Abstract

The present invention relates to a zinc-containing medical device, including a zinc-containing matrix and a polylactic acid coating arranged on the zinc-containing matrix. The polylactic acid coating has a thickness of x μm; and when x and the weight-average molecular weight Mn (kDa) of polylactic acid satisfied the following formula: ( - b + b 2 - 4 ⁢ a ⁢ c ) / 2 ⁢ a - 2 ≤ x ≤ ( - b + b 2 - 4 ⁢ a ⁢ c ) / 2 ⁢ a + 2 , the corrosion rate of zinc in the matrix is relatively small, sufficient mechanical properties can be maintained within the repair period, and the biological risk is relatively low. When the polylactic acid is poly-racemic lactic acid, a=0.0336 ln(Mn)−0.1449, b=−0.472 ln(Mn)+2.1524, and c=1.1604 ln(Mn)−5.7128; and when the polylactic acid is poly-L-lactic acid, a=−0.006 ln(Mn)+0.03441, b=0.0648 ln(Mn)−0.3662, and c=−0.162 ln(Mn)+0.7847.

Dependencies are inferred from the claim text.