Balloon covers for a delivery apparatus for a prosthetic valve are disclosed. As one embodiment, a balloon cover includes first and second shell members that are configured to matingly engage with each other, each of the first and second shell members including a first portion and a second portion, the second portion having a larger width than the first portion. The first portions of the first and second shell members define a first cavity configured to receive a distal end portion of the delivery apparatus and at least a portion of an inflatable balloon mounted on the distal end portion of the delivery apparatus. The second portions of the first and second shell members define a second cavity configured to receive a positioning device mounted on the distal end portion of the delivery apparatus, proximal to a valve mounting portion of the distal end portion of the delivery apparatus.

Surgical methods and tibial implants for accommodating the anterior cruciate ligament during unicompartmental or bi-unicompartmental knee arthroplasty procedures.

Surgical methods and tibial implants for accommodating the anterior cruciate ligament during unicompartmental or bi-unicompartmental knee arthroplasty procedures.

Balloon covers for a delivery apparatus for a prosthetic valve are disclosed. As one embodiment, a balloon cover includes first and second shell members that are configured to matingly engage with each other, each including a first portion defining a first cavity configured to receive a distal end portion of the delivery apparatus and at least a portion of an inflatable balloon. The balloon cover includes one or more depression members, each having a free end configured to move radially inward toward a central longitudinal axis of the balloon cover, and a tubular sleeve configured to be positioned around the depression members and the first portions of the first and second shell members such that the first and second shell members are held in mating engagement with each other and the free ends of the depression members are depressed radially inward and form a negative radial depression in the balloon.

There is provided a lens for use in a human or animal body, the lens comprising a metasurface configured to modulate incident light, wherein the metasurface is composed of at least one light transmissive biomaterial. Also provided is a method of making the lens.

There is provided a lens for use in a human or animal body, the lens comprising a metasurface configured to modulate incident light, wherein the metasurface is composed of at least one light transmissive biomaterial. Also provided is a method of making the lens.