摘要:
The invention discloses an absorbable iron-based alloy stent, comprising an iron-based alloy substrate and a degradable polyester in contact with the surface of the substrate, in which the degradable polyester has a weight average molecular weight of between 20,000 and 1,000,000 and a polydispersity index of between 1.2 and 30. With the degradable polyester, the iron-based alloy is capable of corroding rapidly and controllably within a predetermined period. Following implantation into the human body, the degradable stent serves as a mechanical support at early stage, then gradually degrading and being metabolized and absorbed by the human body. During the process of degradation, minimal or no solid product is produced. Ultimately, the configuration of the lumen with an implanted stent as well as the systolic and diastolic functions thereof return to their natural states.
摘要:
The invention discloses an absorbable iron-based alloy stent, comprising an iron-based alloy substrate and a degradable polyester in contact with the surface of the substrate, in which the degradable polyester has a weight average molecular weight of between 20,000 and 1,000,000 and a polydispersity index of between 1.2 and 30. With the degradable polyester, the iron-based alloy is capable of corroding rapidly and controllably within a predetermined period. Following implantation into the human body, the degradable stent serves as a mechanical support at early stage, then gradually degrading and being metabolized and absorbed by the human body. During the process of degradation, minimal or no solid product is produced. Ultimately, the configuration of the lumen with an implanted stent as well as the systolic and diastolic functions thereof return to their natural states.
摘要:
A parent artery occlusion (PAO) device which provides for immediate occlusion of a cerebral artery to isolate a defect. The PAO device includes a self-expanding wire-frame prolate structure which is partially covered with an ePTFE membrane.
摘要:
A prosthesis and a method for securing a prosthesis at a treatment site are provided. The prosthesis includes a material portion. The material portion includes a liquid-impermeable material layer (22), a porous material layer (28) having a pore size adapted for promoting tissue ingrowth, and an adhesive portion (60) provided on the porous material layer adapted to secure the material portion to a site for at least 24 hours following implantation of the prosthesis at the site. In some embodiments, the prosthesis further includes a body (18).
摘要:
An implant for use as a hemostat comprising: a porous fibrous substrate having pores over at least a portion thereof; a first hydrogel precursor applied to a first portion of the porous substrate; and a second hydrogel precursor applied to a second portion of the porous substrate, the first portion of the porous substrate being spatially separated from the second portion of the porous substrate.
摘要:
The present invention relates to an implant (10) comprising: -a substrate (1) the surface of which comprising oxidized cellulose, said oxidized cellulose having a degree of oxidation ranging from 0.0 to 1, and -a multilayer coating covering said substrate, said multilayer coating comprising at least a first layer (2) adjacent said substrate, said first layer being formed of chitosan, and a second layer (3) adjacent said first layer, said second layer being formed of oxidized cellulose having a degree of oxidation ranging from 0.5 to 1. The invention further relates to a method for preparing such an implant.
摘要:
Systems, methods, and apparatuses for debriding a tissue site are described. The system includes a manifold (108)and a cover (102) adapted to form a sealed space over the tissue site for providing negative pressure. The system also includes a debridement tool (110) positioned between the manifold and the tissue site. The debridement cool having a tissue-facing surface and a plurality of holes separated from each other by walls. The walls have transverse surfaces extending between the tissue-facing surface and an opposite surface that form, cutting edges. The holes have a perforation shape factor that allows the holes to collapse from a relaxed position, to a contracted position in response to the application and removal of negative pressure from, the sealed space. The cutting edges debride the tissue site in response to movement between, the relaxed position and the contracted position.