38 results about "Glaucoma surgery" patented technology

Methods and systems are disclosed for creating an aqueous flow pathway in the trabecular meshwork, juxtacanalicular trabecular meshwork and Schlemm's canal of an eye for reducing elevated intraocular pressure. Some embodiments described apparatus and methods useful in photoablation of tissues. In some embodiments, a photoablation apparatus is used to perforate a tissue, forming an aperture into a space behind the tissue. Gases formed during a photoablation process can be used to pressurize the space behind the tissue to enhance patency of the space. In some embodiments the tissue is the trabecular meshwork of the eye and a wall of Schlemm's canal, and the space behind the tissue is a portion of the lumen of Schlemm's canal. In some embodiments, the method is useful in the treatment of glaucoma by improving outflow from the anterior chamber of the eye into Schlemm's canal, reducing intraocular pressure.

A small gauge mechanical tissue cutter/aspirator probe useful for removing the trabecular meshwork of a human eye has a generally cylindrical outer cannula, an inner cannula that reciprocates in the outer cannula, a port located near or at the distal end of the outer cannula on a side or tip of the outer cannula, and a guide with a distal surface located on the distal end of the outer cannula. A distance between the distal surface of the guide and the port is approximately equal to the distance between the back wall of Schlemm's canal and the trabecular meshwork.

An intraocular light probe has a mask or shield affixed at its distal end thereof which forms a directed light beam for intraocular illumination of target tissues or intraocular application of therapeutic light. The mask or shield serves to more fully focus, intensify and direct the beam toward the target tissues. The mask or shield also helps direct light away from other tissues and away from the eyes of the surgeon. This lessens unwanted glare. By placing a light probe beneath a surgical instrument such as a phacoemulsifier or vitrector, laser, cutting instrument (e.g., scissors or knife), forceps or probe/manipulator, whether as part of or separate from an infusion sleeve, a mask or shield effect is created. This has the same benefits of directing the beam toward target tissues, away from other tissues and away from the eyes of the surgeon. The mask or shield is opaque or semi-opaque and made of a soft, semi-rigid or rigid material. The shield can be rigid enough to serve as the shaft of an instrument with a probe or manipulator at its distal tip. It may also be reflective on the side adjacent to the fiber bundle to help direct, magnify, and intensify the beam of light. The shape of the shield can be flat, curved or circular with an opening along one side. The mask/shield can be removed from the fiberoptic light for sterilization. The device of the invention is preferably introduced into the eye via the primary or side-port incision to provide intraocular cross-lighting of tissues during surgical procedures such as cataract surgery, corneal surgery, vitrectomy, intraocular lens implantation, refractive surgery, glaucoma surgery and vitreo/retinal surgery.

A small gauge mechanical tissue cutter/aspirator probe useful for removing the trabecular meshwork of a human eye has a generally cylindrical outer cannula, an inner cannula that reciprocates in the outer cannula, a port located near or at the distal end of the outer cannula on a side or tip of the outer cannula, and a guide with a distal surface located on the distal end of the outer cannula. A distance between the distal surface of the guide and the port is approximately equal to the distance between the back wall of Schlemm's canal and the trabecular meshwork.

A hydrogel tissue adhesive having increased degradation time is described. The hydrogel tissue adhesive is formed by reacting an oxidized polysaccharide with a water-dispersible, multi-arm amine in the presence of a polyol additive, which retards the degradation of the hydrogel. The hydrogel may be useful as a tissue adhesive or sealant for medical applications, including but not limited to, ophthalmic applications such as sealing wounds resulting from trauma such as corneal lacerations, or from surgical procedures such as vitrectomy procedures, cataract surgery, LASIK surgery, glaucoma surgery, and corneal transplants; neurosurgery applications, such as sealing the dura; as a plug to seal a fistula or the punctum; adhesion prevention to prevent undesired tissue to tissue adhesions resulting from trauma or surgery; and as a hemostat sealant.

The invention discloses a composite biological matrix for glaucoma surgery and a preparation method thereof. The composite biological matrix has a double-layer composite structure formed by aging and freeze-drying a compact base material layer and a loose layer coated on the compact base material layer, wherein the compact base material layer is a cross-linked denuded amniotic membrane or animal tissue membrane, and the loose layer is a porous membrane prepared from a biological macromolecular material. The composite biological matrix is prepared by multiple times of cross-linking modification, so that the retention time of the composite biological matrix in vivo is significantly prolonged, the effect of stably preventing scarring for a long term is achieved, and the long-term treatment effect after filtering surgery can be effectively improved.

Eye diseases such as glaucoma can be treated using a composition containing cross-linked hyaluronic acid or a cross-linked salt of hyaluronic acid such as sodium hyalurate. The composition can be a monophasic gel. The composition can include a cross-linking agent such as 1,4-butanediol diglycidylether. The composition can contains about 2.25% (w/w) of the salt of hyaluronic acid. The composition can have a cross-linking rate of about 0.5 to 50%.

The invention provides application of a collagen implant in preparing a glaucoma surgery auxiliary recovery substance, and belongs to the field of biomedical materials. The collagen is a cowhide purified collagen, and the recovery substance is a sponge-shaped collagen-chitosan matrix with a three-dimensional pore structure and the pore size distribution of 150-450 microns and serves as a surgery auxiliary recovery substance for glaucoma trabeculectomy. The recovery substance can promote the penetration of cells or aqueous humor or the discrete proliferation in the cells or aqueous humor to maintain low intraocular pressure and reduce the expression quantities of basic fibroblast growth factors, transforming growth factors and fibrous connective tissue growth factors to reduce the scarringdegree of a filtering tract; a preparation method of the recovery substance has the advantages that glutaraldehyde is not adopted as a cross-linking agent, the number of exposed amino groups in the chitosan structure can be reduced, the problem that the anti-scarring effect is not obvious due to the adhesion of excessive amino groups and the tissue is solved, the protective hydration function of chitosan chains is destroyed, pore channels in the matrix are smaller and compact, and the water absorption performance is improved.

A valve device for use in glaucoma surgery comprises at least one aqueous humor feeding duct (2) having a first end (2a) designed to fit into the anterior chamber of the eyeball, a balancing chamber (3) communicating with a second end (2b) of the feeding duct (2) and having an inner volume ranging from 2 mm3 to 6 mm3, and designed to be introduced into a surgical groove in the sclera, a retainer member (6) placed within the feeding duct (2) to allow fluid transfer from the first end (2a) toward the second end (2b) of the feeding duct (2) and to inhibit fluid transfer in the opposite direction. A plurality of aqueous humor outflow ducts (5) extend from the balancing chamber (3) to allow outflow of aqueous humor from the balancing chamber (3) to an outside space.

The invention discloses a chamber angle observation mirror. The chamber angle observation mirror comprises a mirror frame and a lens installed on the mirror frame, wherein the mirror frame comprises ahandle, a floating support and a stabilization piece, and the handle, the floating support and the stabilization piece form the suspension mirror frame, so that the lens stably floats and is installed above the eyeball; the handle is used for installing the installation end of the lens and is hinged to the floating support which can rotate within a certain range, and one end of the floating support is hinged to the lens which can rotate within the certain range; the stabilization piece is in direct contact with the eyeball and limits the relative position between the lens and the eyeball; theend, facing the eyeball, of the lens is a concave surface, and the end, away from the eyeball, is a convex surface with a non-spherical surface; the optical axis of the concave surface and the optical axis of the convex surface are not coaxial, that is, the lens is of an off-axis lens optical framework. The observation mirror is very convenient to use in glaucoma surgeries, and the smooth and quick surgeries are guaranteed.

A medical device for glaucoma surgery includes a tubular body provided with a through cavity extending from a proximal end to a distal end. The tubular body has a first proximal positioning means at the proximal end, and a second distal positioning means at the distal end. The tubular body has at least one proximal filtration hole, located on the side of the proximal end, and at least one distal filtration hole, located on the side of the distal end, the proximal and distal holes being fluidically connected to each other by the through cavity. The proximal and distal filtration holes are at least partially or completely occluded by a membrane made of resorbable material at least partially removable by selective action, so as to allow selective variation of the amount of aqueous humor flow removable via the through cavity.