US 12,453,803 B2
Composite positive and negative Poisson's ratio materials for medical devices
Joon Bu Park, Las Vegas, NV (US)
Filed by Joon Bu Park, Las Vegas, NV (US)
Filed on Aug. 17, 2021, as Appl. No. 17/404,434.
Prior Publication US 2023/0058045 A1, Feb. 23, 2023
Int. Cl. A61L 31/14 (2006.01); A61F 2/915 (2013.01); A61L 31/02 (2006.01); A61F 2/00 (2006.01)
CPC A61L 31/14 (2013.01) [A61F 2/915 (2013.01); A61L 31/022 (2013.01); A61F 2002/0081 (2013.01); A61F 2210/0019 (2013.01); A61F 2210/0076 (2013.01); A61F 2250/0024 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A stent for insertion into a vessel of a patient, the stent comprising:
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 foam material having an anisotropic negative Poisson's ratio (NPR) and disposed around an entirety of the inner tube, the outer tube extending along the longitudinal axis of the stent,
wherein the anisotropic NPR foam material of the outer tube defines pores on an outer surface of the outer tube, wherein the pores are re-entrant structures that are polydisperse and randomly arranged;
wherein a hydroxyapatite material is disposed across the anisotropic NPR foam material of the outer tube with the polydisperse and randomly arranged pores that are defined by the re-entrant structures of the anisotropic NPR foam material;
wherein the stent is configured to exhibit an auxetic behavior in response to a deformation of the stent; and
wherein at least one of the inner tube or the outer tube is configured to deform from a first deformation state to a second deformation state in response to a transition from a first temperature to a second temperature and to deform from the second deformation state to the first deformation state in response to a transition from the second temperature to the first temperature, where the first temperature is lower than the second temperature.