Embodiments of the present disclosure provide a drainage apparatuses with scar gradient control capabilities for degradable glaucoma and methods of making the same cross-reference to related applications, comprising a long-strip-shaped drainage sheet with a uniform overall cross-sectional size, wherein the drainage sheet is made of a biodegradable material, an outer surface of the drainage sheet is provided with a drainage gap that penetrates through opposite sides of the drainage sheet, an outer surface of the drainage sheet is coated with a biodegradable surface coating, and the surface coating carries an anti-scarring drug, wherein the anti-scarring drug is configured to be gradually released as the surface coating degrades, and a distribution concentration of the anti-scarring drug within the surface coating varies in a non-monotonic manner.

A coating with strong adhesion for medical magnesium alloys, including a magnesium phosphate or calcium phosphate layer as an inner layer and a hydrophobic polymer layer as an outer layer. The inner layer is attached to the medical magnesium alloy; and the outer layer is attached to the inner layer. A preparation method of the coating is also provided, including: (S1) carrying out surface treatment on a medical magnesium alloy substrate; (S2) preparing a solution including magnesium salt/calcium salt and phosphoric acid/phosphate followed by pH adjustment and heating; (S3) soaking the medical magnesium alloy substrate in the solution followed by washing and drying to obtain a magnesium phosphate/calcium phosphate layer-coated medical magnesium alloy sample; and (S4) depositing a hydrophobic polymer layer on the medical magnesium alloy sample through chemical vapor deposition (CVD).

A stent for insertion into a vessel of a patient includes an inner tube comprising a positive Poisson's ratio (PPR) material and defining a lumen extending along a longitudinal axis of the stent; and an outer tube comprising a negative Poisson's ratio (NPR) foam material and disposed around an entirety of the inner tube, the outer tube extending along the longitudinal axis of the stent. The stent is configured to exhibit an auxetic behavior in response to a deformation of the stent. An outer surface of the second portion is configured to apply a pressure to an inner surface of the vessel when the stent is implanted into the vessel and the deformation is removed.

A coating with strong adhesion for medical magnesium alloys, including a magnesium phosphate layer or a calcium phosphate layer as an inner layer and a hydrophobic polymer layer as an outer layer. The inner layer is attached to the medical magnesium alloy; and the outer layer is attached to the inner layer.