20 results about "Anterior surface" patented technology

In certain embodiments, an ophthalmic system for determining the topography of the anterior surface of the cornea of an eye comprises an illuminator, a camera, and a computer. The illuminator illuminates the anterior surface of the cornea of the eye with a Placido pattern. The Placido pattern comprises a plurality of rings. A ring of the plurality of rings has a distinguishing feature that distinguishes the ring from an adjacent ring. The anterior surface of the cornea reflects the Placido pattern. The camera captures an image of the reflected Placido pattern. The computer: analyzes the image to detect a distortion of the ring that indicates an anomaly of the anterior surface of the cornea; identifies the ring of the plurality of rings according to the distinguishing feature of the ring; and generates the topography of the surface of the cornea that includes the anomaly.

This invention belongs to the field of contact lens technology, specifically providing a method for designing scleral lenses based on ocular surface and scleral topography. Based on the topography of the anterior surface of the patient's cornea and sclera, the method divides the anterior surface of the cornea and sclera into meridians at equal angles, and designs the surface profile curves of the anterior and posterior surfaces of the scleral lens according to the morphology of the patient's cornea and sclera. Finally, 3D reconstruction is used to obtain the 3D surface profile data of the scleral lens. The optical zone of the scleral lens can be designed in various ways depending on the different shapes of the patient's eyeball; the transition zone can be designed in diverse ways to ensure the thickness of the intraocular fluid at certain locations based on the ocular surface morphology; and the landing zone smoothly conforms to the anterior surface of the sclera. This invention maximizes conformity to the patient's ocular surface morphology, ensures the uniformity of the intraocular fluid, and maintains a high degree of matching with the ocular surface, thereby achieving trial-free scleral lens fitting, improving clinical accuracy and efficiency, and enhancing patient safety and satisfaction.

The utility model relates to an orthokeratology lens. The orthokeratology lens has a posterior surface for shaping the anterior surface of the cornea, the posterior surface having a base arc region and a reverse arc region. The curvature radius of the base arc area is gradually reduced from the center to the periphery; and / or the curvature radius of the reverse arc area is smaller than that of the base arc area and is gradually reduced from inside to outside. And / or the area with the preset width at the tail end of the base arc area is set as a transition arc area, and the curvature radius of the transition arc area is smaller than that of the base arc area and larger than that of the reverse arc area. Thus, the rear surface optical region can be lifted to increase the thickness of the central tear layer, so that the region is full of tear.

A method of manufacturing an intraocular lens (IOL). Method includes mounting the anterior part of the IOL on a first nest where the anterior part defines a receptacle and has a haptic extending from an anterior face. A pre-determined desired amount of fluid is introduced in the receptacle. A bonding agent can be introduced into a trough of posterior part of the IOL and the posterior part can be mounted on a second nest. Force can be applied to draw the first nest towards the second nest (or vice versa) or the first and second nests can be placed in a vacuum sealed chamber and the first and second nest can be mechanically drawn together. Alternatively, the first and second nests can be placed in an inert gas chamber such that the posterior part and the anterior part are mechanically join together to form a fluid filled integral IOL.

An open capsular tension ring (10) for implanting in a capsular bag of an eye comprising a posterior surface (12) and an anterior surface (14) extending between a first end and a second end of the rin

FIELD: traumatology; orthopedics.SUBSTANCE: used for arthroscopy of the hip joint to eliminate Cam or combined types of femoroacetabular impingement. A proximal anterolateral port is created to the peripheral portion of the hip joint, which is used as a viewing port at the beginning of the operation; 4 cm distal and 2 cm lateral to the intersection of the midline of the femur and the perpendicular drawn to it through the apex of the greater trochanter, an anterior port is created, which is used as an instrumental port at the beginning of the operation. The deformation zone is brought to the bone burr, changing the positions of flexion and extension, internal and external rotation of the lower limb, and until the appearance of spring resistance of the fibers of the lateral joint capsule and the ileofemoral ligament, resection of excess bone mass of the anterior surface of the proximal femur within the boundaries of the Cam-deformation is performed. The viewing and instrument ports are changed and the deep fibers of the proximal joint capsule and the ileofemoral ligament are released from the acetabulum. In the presence of Pincer deformity, soft tissues are removed to visualize excess bone mass within the boundaries of the Pincer deformity, and resection of excess bone mass of the anterolateral edge of the acetabulum within the boundaries of the Pincer deformity is performed until radiographic visualization of the absence of intersection of the anterior and posterior edges of the acetabulum. The viewing and instrument ports are replaced. An arthroscope is positioned on the outer edge of the joint capsule fibers, and bone resection of the posterolateral surface of the proximal femur is completed within the boundaries of the Cam deformity by inserting a bone burr from the skin incision of the anterior port into the capsule opening of the proximal anterolateral port, preserving the fibers of the joint capsule and the ileofemoral ligament.EFFECT: method ensures correction of the proximal femur within the boundaries of the Cam-deformation while maintaining the integrity of the structures of the passive capsular-ligamentous stabilizers and eliminates the development of complications in the form of microinstability of the hip joint, anterior dislocation of the femoral head, heterotopic ossification due to maintaining the integrity of the structures of the passive capsular-ligamentous stabilizers and eliminating the development of microinstability of the hip joint, anterior dislocation of the femoral head and heterotopic ossification.1 cl, 1 ex

The intraocular lens (IOL) includes a lens body having an anterior surface and a posterior surface centered on an optical axis, and a gradual phase-step structure formed on the refractive surface profile of at least one of the anterior surface and the posterior surface, wherein at least one of the anterior surface and the posterior surface has an outer zone, an inner zone, and a transition zone continuously connecting the outer zone and the inner zone. The refractive surface profile of the outer zone provides a base refractive power, and the refractive surface profile of the inner zone provides an add refractive power. The gradual phase-step structure includes a first annular ridge structure in the inner zone and a second annular ridge structure extending radially from the transition zone to the outer zone.

Methods and systems for planning and forming incisions in a cornea, lens capsule, and / or crystalline lens nucleus are disclosed. A method includes measuring spatial dispositions, relative to a laser surgery system, of at least portions of the corneal anterior and posterior surfaces. A spatial disposition of an incision of the cornea is generated based at least in part on the measured corneal anterior and posterior spatial dispositions and at least one corneal incision parameter. A composite image is displayed that includes an image representative of the measured corneal anterior and posterior surfaces and an image representing the corneal incision.

An orthopaedic surgical instrument includes an alignment guide having a pair of spacing guides secured thereto. The spacing guides are positioned between an installed femoral trial component and the articular surfaces of a patient's tibia. The alignment guide is secured to the spacing guides so as to align a tibial cutting block on the anterior surface of the patient's tibia based on desired extension gaps. A method of surgically preparing a patient's tibia is also disclosed.

Provided herein are devices for repairing the natural lens capsule after cataract surgery. The devices use a substantially annular rigid and flexible assembly to contact the posterior and anterior surfaces of the capsule after cataract surgery to repair the capsule shape. Also provided are devices for tensioning the capsule after cataract surgery. An elastic annular body is shaped to secure the edges of a capsulorhexis in a clamp-like configuration. Alternatively, similar to the rigid and flexible assembly of the capsule repair device, the elastic annular body is formed with a lower assembly depending from the body and a flexible annular body extending from the lower assembly.

A method of manufacturing an intraocular lens (IOL). Method includes mounting the anterior part of the IOL on a first nest where the anterior part defines a receptacle and has a haptic extending from an anterior face. A pre-determined desired amount of fluid is introduced in the receptacle. A bonding agent can be introduced into a trough of posterior part of the IOL and the posterior part can be mounted on a second nest. Force can be applied to draw the first nest towards the second nest (or vice versa) or the first and second nests can be placed in a vacuum sealed chamber and the first and second nest can be mechanically drawn together. Alternatively, the first and second nests can be placed in an inert gas chamber such that the posterior part and the anterior part are mechanically join together to form a fluid filled integral IOL.

In one aspect, a collagenous lenticule for use in intrastromal implantation is disclosed, which includes a decellularized lenticular body derived from a corneal donor source having an anterior surface and a posterior surface, where the decellularized lenticular body includes collagen fibers distributed therein such that the lenticular body exhibits birefringence to visible light and further exhibits sufficient optical clarity for intrastromal implantation. A lenticule according to the present teachings can be implanted in a patient's stromal layer to correct a refractive error of the eye, such as presbyopia.

Treatment device for surgical hyperopia correction of the eye (3), wherein the treatment device (1) comprises a laser device (L) controlled by a control unit (12), which separates corneal tissue by emitting laser radiation (2), wherein the control unit (12) is configured to control the laser device (L) to emit the laser radiation (2) into the cornea (5) in such a way that a lenticular volume (18) is isolated in the cornea (5), the removal of which from the cornea (18) effects the desired hyperopia correction, wherein the control unit (12), when controlling the laser device (L), specifies the lenticular volume (18) such that it has a posterior surface (20) and an anterior surface (19) which are connected to each other in a transition zone (24) which has a width of at least 0.1 mm, characterized in that the edge surface (24) has a first,The section (25) opens largely perpendicularly into the anterior surface and has a second section (26) that is more strongly inclined towards the visual axis (OA).

A unicompartmental arthroplasty femoral component comprising a main body and a plurality of pegs that extend from the posterior surface. The main body has an anterior surface, a posterior surface, a proximal end joining the anterior surface and the posterior surface, and a distal end joining the anterior surface and the posterior surface. The anterior surface has a crescent shape and an anterior intermediate point disposed between the proximal end and the distal end. The proximal end and the distal end are disposed on a first line that lies on a first plane that is parallel to a second plane that includes a second line that is tangent to the anterior intermediate point. The posterior surface defining a plurality of pairs of facets.

Provided herein are devices used to reconstruct a natural lens capsule after a cataract surgery. The device has a ring-shaped rigid component, a ring-shaped flexible component and a groove disposed on an inner surface of the rigid component. The rigid component has a distal end attached to the ring-shaped flexible component and a proximal end that lies against Wieger's ligament when fitted within the natural lens capsule. The ring-shaped flexible component has a proximal end that is attached to the distal end of the rigid component and a distal end that contacts an anterior surface of the natural lens capsule when fitted therein. The groove is disposed to receive optics of an intraocular lens and / or the ledge is disposed to secure haptics thereof.

Decellularized and shaped corneal tissue lenticules from allograft and / or xenograft sources and methods of obtaining such lenticules are disclosed. The lenticules are particularly useful as intrastromal lenticular implants in keratoplasty procedures, in which a hinged flap is formed in a patient's cornea and folded back along its hinge to expose the stromal bed of the cornea. The shaped lenticule is then applied to the stromal bed and the flap returned to its original position yielding a new curvature for the cornea and resulting in a desired refractive correction. Fine-tuning of the new refractive power can be achieved by laser ablation either at the same time as implantation or at later time in the event of regression or tonus changes. Methods of decellularizing cornea tissue are disclosed to reduce potential immunogenic reactions on the part of the patient to the implanted lenticule. The lenticules can be further treated to remove immunogenic epitopes. In addition, the posterior and / or anterior surfaces of the lenticule can be treated to assist in intrastromal seating of the lenticule and / or to reduce the likelihood of dislodgement. The methods of forming lenticules can further include preserving at least a portion of the Bowman's membrane. The smoothness of the Bowman's membrane surface also makes it less likely that reopening the flap will dislodge the lenticule.

During operation, a measurement sensor in an electronic device may perform radar measurements associated with an individual, where the radar measurements include information corresponding to a physiological signal of the individual. Then, the electronic device may analyze the radar measurements to extract an amplitude and / or a phase of chest motion on or proximate to an anterior surface and / or a posterior surface of the individual. Moreover, the electronic device may map an amplitude and / or a phase of the chest motion on or proximate to the anterior surface and / or the posterior surface to one or more anatomical locations associated with an organ of the individual. Next, the electronic device may detect whether the type of arrhythmia is present based at least in part on the mapped amplitude and / or the phase.

A method for delivering a medication pellet to a subcutaneous insertion site with a round tipped obturator and blunt cannula is described. The obturator is received within the cannula. The cannula includes a tubular cannula body having a smooth anterior surface a medication slot disposed along the cannula body. The cannula and obturator probe an incision into the subcutaneous tissue along a non-linear insertion path within the subcutaneous tissue. The obturator is removed from the cannula, and the medication pellet is placed in the medication slot. The cannula body again receives the obturator, which passes the pellet through the cannula body with its anterior rounded tip so that the obturator pushes the pellet(s) through the cannula body. The pellet exits the cannula body.

In certain embodiments, an ophthalmic system for determining the topography of the anterior surface of the cornea of an eye comprises an illuminator, a camera, and a computer. The illuminator illuminates the anterior surface of the cornea of the eye with a Placido pattern. The Placido pattern comprises a plurality of rings. A ring of the plurality of rings has a distinguishing feature that distinguishes the ring from an adjacent ring. The anterior surface of the cornea reflects the Placido pattern. The camera captures an image of the reflected Placido pattern. The computer: analyzes the image to detect a distortion of the ring that indicates an anomaly of the anterior surface of the cornea; identifies the ring of the plurality of rings according to the distinguishing feature of the ring; and generates the topography of the surface of the cornea that includes the anomaly.

This invention discloses a sutureless composite artificial cornea, comprising a polymer posterior membrane and a biological anterior membrane fixed to the anterior surface of the polymer posterior membrane. The biological anterior membrane is divided into a central zone and a peripheral zone. The peripheral zone contains several radially arranged tunnels, with the head end of each tunnel located on the upper surface of the peripheral zone and the tail end located at the outer edge of the peripheral zone. Each tunnel contains a pre-embedded tissue fixation guidewire, and the length of the tissue fixation guidewire is greater than the length of the tunnel. The advantages of this invention are: by setting radial tunnels within the peripheral zone of the biological anterior membrane and pre-embedding tissue fixation guidewires within the tunnels, during surgery, the tissue fixation guidewires are pushed in along the tail end of the tunnels, allowing them to be inserted into the corneal implant bed, achieving fixation between the cornea and the corneal implant bed. This avoids corneal astigmatism caused by suturing and simplifies the surgical procedure.