70 results about "Pedicle screw fixation" patented technology

This invention resides in an apparatus for inhibiting full extension between upper and lower vertebral bodies, thereby preventing pain and other complications associated with spinal movement. In the preferred embodiment, the invention provides a generally transverse member extending between the spinous processes and lamina of the upper and lower vertebral bodies, thereby inhibiting full extension. Various embodiments of the invention may limit spinal flexion, rotation and / or lateral bending while preventing spinal extension. In the preferred embodiment, the transverse member is fixed between two opposing points on the lower vertebral body using pedicle screws, and a cushioning sleeve is used as a protective cover. The transverse member may be a rod or cable, and the apparatus may be used with a partial or full artificial disc replacement. To control spinal flexion, rotation and / or lateral bending one or more links may be fastened to an adjacent vertebral body, also preferably using a pedicle screw. Preferably a pair of opposing links are used between the upper and lower vertebral bodies for such purposes.

In a method of treating the spine of a patient, an access device is inserted into the patient with the access device in a first configuration having a first cross-sectional area at a distal portion thereof. The access device is actuated to a second configuration having an enlarged cross-sectional area at the distal portion thereof such that the distal portion extends across at least a portion of each of two adjacent vertebrae. A stabilization of the vertebrae is then achieved using either translaminar facet screw fixation or transfacet pedicle screw fixation.

A pedicle screw system includes a pedicle screw and a tulip assembly. A rod is inserted and fixed in the pedicle screw system to surgically connect vertebral bodies. The pedicle screw includes a head portion and a threaded shaft. In one embodiment, the tulip assembly includes a tulip body, a rod-support member, a collar member, a cap, and a fastening member. The tulip body has an upper portion and a lower portion, these portions being displaceable in opposite directions relative to an intermediate web. The tulip body can be intra-operatively coupled to the pedicle screw after the screw has been inserted into the bone. The cap engages with the tulip body to lock the tulip body onto the pedicle screw and thus fix the tulip body at a desired angle relative to the pedicle screw.

A pedicle screw assembly is provided that includes a pedicle screw and a preloaded set screw. The set screw is preloaded in a threaded, central aperture formed in the head region of the pedicle screw. An interference is advantageously formed on the set screw to prevent dislodgement of the set screw, e.g., during shipment and / or clinical placement of the pedicle screw. An upwardly extending collet is generally formed in the head region of the pedicle screw, the collet being sized to receive a spherical element therearound. Advancement of the set screw relative to the pedicle screw secures the spherical element relative to the pedicle screw. The spherical element typically includes a socket member that cooperates with a dynamic stabilizing member. The pedicle screw assembly and dynamic stabilizing member are advantageously used as part of a spinal stabilization system to provide clinically efficacious results.

A medical device adapted to facilitate pedicle screw fusion surgery is disclosed herein. The medical device includes a proximal end and a sharp distal end opposite the proximal end. The distal end is configured to allow the medical device to function as an awl. The medical device also includes a body portion defined between the proximal end and the distal end, and a threaded section defined by the body portion near the distal end. The threaded section is configured to allow the medical device to function as a tap. Accordingly, the medical device provides a single tool adapted to function as both an awl and a tap. A corresponding method for securing a pedicle screw to a vertebra is also provided.

A spinal fixation system includes a pedicle screw having a longitudinal axis. A fixation element is configured to connect the pedicle screw to at least one additional pedicle screw. A coupling mechanism includes a pedicle screw securing device adapted to secure the coupling mechanism to the pedicle screw and a fixation element securing device configured to secure the coupling mechanism to the fixation element. A fastening mechanism is configured to fasten both the pedicle screw securing device and the fixation element securing device. The fastening mechanism is located along the longitudinal axis of the pedicle screw.

A pedicle screw fastening that can be made polyaxial, monoaxial, fixed, or provide a predefined monoaxial placement. The fastening system consists of an anchoring bone screw having threads on one end for use in anchoring to the screw to the spine and a spherical connector on the other end operating as a pivot point about which a U-shaped or side loading connecting assembly is used to secure to a connecting rod for use in stabilization of a spine. The connecting assembly, for receipt of a spinal connecting rod, includes a biased retainer ring for maintaining a positive tension between the connecting assembly and the anchored screw. The system allows for an improved manufacturing step wherein the threaded shank of a bone screws can be passed through a lower portion of the connecting assembly allowing a variety of bone screw sizes to be used with a common sized connector.

A locking mechanism for locking a rod in a screw and rod fixation assembly includes a cap having a sidewall and a locking element extending from at least a portion of the sidewall. Locking mechanism cooperates with a receiver component for a spinal fixation rod to lock the rod in the receiver without requiring application of torque. A method of locking a spinal fixation member in a receiver of a screw fixation assembly includes the steps of placing the spinal fixation member into a channel of a receiver, axially advancing a locking cap into the receiver toward the spinal fixation member without application of any torque, and securing the locking cap in a locked position above the spinal fixation member without application of any torque.

The instant invention is a novel method for definitive pelvic stabilization. The method uses the already established principles of anterior external fixation combined with internal hardware placed in a minimally invasive fashion. Pedicle screws are affixed to the ilia and a rigid, bowed fixation rod is connected between the pedicle screws. Preferably the pedicle screws are attached to the supra-acetabular area of each of the ilium of the pelvis and the fixation rod is bowed anteriorly away from the pelvis.

Pedicle screws are secured in two columns, one along each side of the spine. Cross support rods have ends connected to pedicle screw heads. A longitudinally extending rod is supported on the cross supports and recessed in the cavity created by removal of portions of spinous processes, providing a reduced profile of the installed construct. Several types of cross supports are shown such as: arms from the screws inward to rings or yokes connecting the longitudinal rod; cross rods with ends connected to the screws and having centrally-located yokes for the longitudinal rod; cross rods with articulating longitudinal rod portions fixed or swiveled to them. These cross rods may have end portions angled posterior toward anterior to accommodate lateral positioned pedicle screws, but shorter cross rods without angled end portions enable medialized pedicle screw orientation.

A spinal fusion implant system and a method of using the spinal fusion implant system are provided. The spinal fusion implant system includes a plurality of links with each link having a pair of opposing end portions. The spinal fusion implant system also includes a plurality of pedicle screws. Each pedicle screw has a head and a depending shank for fixing the pedicle screw to a bone. The head has a slotted recess configured to receive one end portion of at least two different links or two slotted recesses each of which is configured to receive an end portion of one of the links. Each recess has an associated set screw for clamping the end portions of the respective links in the recess.

A pedicle screw fixation system and method for use of the same are disclosed. In one embodiment, a tulip is provided for holding a head of a pedicle screw substantially along a longitudinal axis. The tulip includes opposing first and second U-shaped receiving slots aligned along a transverse axis. A rod is received by the opposing first and second U-shaped receiving slots. A coupling collar includes a plurality of resilient fingers circumferentially disposed therearound such that a snap fit engagement with the head of the pedicle screw formed. The coupling collar includes a first deformable face operable for contact with the rod. A set screw is for adapted for driving engagement through the tulip along the longitudinal axis such that a second deformable face is positioned for contact with the rod. The first and second deformable faces conform to the shape of the rod in response to forceful engagement therewith.

An anatomic posterior lumbar system comprising of a thin plate and fasteners for securing the plate to vertebra or other osseous material. The plate is preferably a thin rectangular structure having an opening running lengthwise in its central portion. At least one pedicle screw having a hollow threaded interior is fastened to a vertebra, and the plate located on the screw using the opening. A washer spans the width of the plate, and accommodates an inner screw, which is threaded into the pedicle screw, and captures the head of the inner screw. Miscellaneous shapes of plates are also disclosed which are fitted to specific portions of the spine.

A locking mechanism for locking a rod in a screw and rod fixation assembly includes a cap having a sidewall and a locking element extending from at least a portion of the sidewall. Locking mechanism cooperates with a receiver component for a spinal fixation rod to lock the rod in the receiver without requiring application of torque. A method of locking a spinal fixation member in a receiver of a screw fixation assembly includes the steps of placing the spinal fixation member into a channel of a receiver, axially advancing a locking cap into the receiver toward the spinal fixation member without application of any torque, and securing the locking cap in a locked position above the spinal fixation member without application of any torque.

In a method of treating the spine of a patient, an access device is inserted into the patient with the access device in a first configuration having a first cross-sectional area at a distal portion thereof. The access device is actuated to a second configuration having an enlarged cross-sectional area at the distal portion thereof such that the distal portion extends across at least a portion of each of two adjacent vertebrae. A stabilization of the vertebrae is then achieved using either translaminar facet screw fixation or transfacet pedicle screw fixation.

A 3D corrector for the lateral protrusion of spine is composed of the pediculus arcus vertebrae scrows with open fixed to both sides of deformed spine, shape-memory Ni-Ti alloy rods inserted in the open top of said screw, and nuts or locking said alloy rods in the open top. Its transverse connection of Ni-Ti alloy rod is performed by use of clamps and nuts.

The invention discloses a pedicle screw, which comprises a screw rod, a fixing cap and a screw plug, wherein the screw rod is provided with an external screw thread part, the fixing cap is hinged with the tail part of the screw rod, the top end of the fixing cap is provided with an internal screw thread fixing hole, the screw plug is arranged in the internal screw thread fixing hole, a connecting rod installing hole of which the axis is coincided with the normal line of the surface of the fixing cap is also arranged on the fixing cap, the pedicle screw also comprises two arc-shaped leaf springs symmetrically arranged on the fixing cap, one ends of the leaf springs are fixedly connected with the fixing cap, and the other ends of the leaf springs are outwards unfolded. After the pedicle screw provided by the invention is fixedly arranged on the vertebral body, the leaf springs expand open the peripheral muscle, skin and other tissue, surgery doctors can touch through fingers under the direct viewing condition for placing in the connecting rod, and the problems of complicated operation, long time and high difficulty caused by poor view sight of the existing spine percutaneous internal fixing system are solved. The invention also provides a spine percutaneous internal fixing system.

The invention concerns an intervertebral dynamic fixation implant intended for stabilization of the lumbar spine in one or more intervertebral segments, comprising: an intervertebral wedge extending along a vertical axis, comprising two craniocaudal notches intended for receiving the spinous processes of two lumbar vertebrae Ln and Ln+1, a vertical channel being arranged on the two lateral faces of said intervertebral wedge, a rigid strip covering a portion of the back face and of the two lateral faces of the intervertebral wedge, so as to leave a passageway in the vertical side channels, at least one hole passing through the intervertebral wedge from one lateral face to the other, in the caudal portion of the rigid strip, two pedicle screws fixed to the lumbar vertebra Ln+1, comprising a system for tensioning and attaching a braid Tn which wraps around the spinous process of lumbar vertebra Ln and passes through the passageways of the side channels of the intervertebral wedge, a rod perpendicular to the vertical axis of the intervertebral wedge, connecting the two pedicle screws by passing through said at least one hole located in the caudal portion of the rigid strip.

The present invention discloses a partial punctate solidifying method of a vertebrae arch pedicle bolt passage and a matched hollow lateral hole tap. The hollow lateral hole tap is combined with biological material to process for the partial punctate solidification towards the surrounding wall of the vertebrae arch pedicle bolt passage. The hollow lateral hole tap consists of a tap section, a cylinder, a hexahedron and an external screw thread section as a whole, and the center forms a cavity. At the screw thread passage of the tap section, when the hollow lateral hole tap rotates for certain degree along the rotation direction of the screw thread passage from a tip, lateral holes are struck inside the screw thread passage orderly to be communicated with the cavity. The method ensures the complete combination of a bolt and the bone and at the same time improves the mechanical intensity between the bolt and the bone interface, which achieves the purpose of intensifying the fixation of the vertebrae arch pedicle bolt, avoids various complications caused by bone cement coating the bolt completely and effectively improves the clinical curative effect; at the same time, the method does not influence the fixation intensity of the vertebrae arch pedicle bolt, at the same time reduces the damage to the centrum and vertebrae arch pedicle bone caused by taking out the vertebrae arch pedicle bolt and reduces the influence on the vertebral column stability caused by taking out the bolt.

The instant invention is a novel method for definitive pelvic stabilization. The method uses the already established principles of anterior external fixation combined with internal hardware placed in a minimally invasive fashion. Pedicle screws are affixed to the ilia and a rigid, bowed fixation rod is connected between the pedicle screws. Preferably the pedicle screws are attached to the supra-acetabular area of each of the ilium of the pelvis and the fixation rod is bowed anteriorly away from the pelvis.

The invention provides a pedicle screw fixation device and system for thoracolumbar spine posterior orthopedics, and relates to the technical field of medical instruments. The pedicle screw fixation device for the thoracolumbar spine posterior orthopedics comprises a pedicle screw, a limiting piece and a locking piece; the pedicle screw comprises a screw head part and a screw body part which are connected with each other; the screw head part is provided with a sliding groove for placing a connecting rod; the limiting piece is movably connected with the sliding groove, can move in the axial direction of the sliding groove and is internally provided with a mounting channel which is axially through; the locking piece is movably connected with the mounting channel and can move in the axial direction of the mounting channel. According to the pedicle screw fixation device for the thoracolumbar spine posterior orthopedics, an existing sliding groove screw growth rod system is improved, through a mode that the limiting piece cooperates with the locking piece, the situation that by means of the existing sliding groove screw system, an incision operation is needed again in the final operation, an original implant is replaced, and the pain and financial burden of patients are greatly reduced.

The invention provides an interbody fusion cage used for being disposed into vertebral body gaps. The interbody fusion cage comprises a fusion cage body and an expander. A bone grafting groove is formed in the fusion cage body. The expander is arranged in the bone grafting groove, and comprises an expanding device and an adjusting device for adjusting the expanding device. The expanding device hasan initial state and an expansion state. In the initial state, the expanding device can be completely accommodated in the bone grafting groove, and in the expansion state, the expanding device can extend out of the bone grafting groove after expansion. By the adjusting device, the expanding device can be switched from the initial state to the expansion state and is nailed into vertebral bodies. The interbody fusion cage has the advantages that the fusion cage can be immediately fastened between the upper vertebral body and the lower vertebral body, the anti-slip effect and the support effectcan be guaranteed, pedicle screw fixation can be avoided, and surgical difficulty and risk are reduced; the interbody fusion cage can support the vertebral bodies effectively, has a good support function, and can be prevented from being influenced by blocking of intervertebral disk tissues and residual end plate cartilages; the fixation effect is good, and the anti-slip function of the interbody fusion cage is guaranteed effectively.

The invention discloses a self-guide long-arm solid percutaneous pedicle screw which comprises a screw head, a screw body and a screw tail connected in sequence from front to rear. The screw head is a solid cone. The section of the screw head decreases gradually from front to rear. The screw body comprises a solid cylinder front section and solid cone rear section. The front end of the cylinder front section and the rear end of the screw head are in smooth transition. The rear end of the cylinder front section and the front end of the cone rear end are in smooth transition. Outer threads are formed on the outer peripheral wall of the cylinder front section. The screw tail is U-shaped and provided with two fixing arms and a screw seat connecting the two fixing arms. The rear end of the cone rear section is connected with the screw seat. The section of the cone rear section gradually increases from front to rear. The rear-end section of the cone rear section is smaller than the section of the screw seat. The self-guide long-arm solid percutaneous pedicle screw has the advantages accurate percutaneous pedicle screw fixation is achieved, operative wound is reduced, and high mechanical strength of the pedicle screw is guaranteed.

The invention discloses a spacing distance adjusting device for percutaneous pedicle screws. The device comprises a force-applying forcep assembly and two abutting assemblies. The force-applying forcep assembly is provided with connection ends and a handle structure used for driving the connection ends to fold or open. The two abutting assemblies respectively correspond to the two connection endsone by one. The abutting assemblies comprise first abutting parts, first connecting-rod parts, second connecting-rod parts and third connecting-rod parts. One end of each first connecting-rod part isprovided with a forcep opening and the other end thereof is fixedly connected with one end of each first connecting-rod part. The other end of each first connecting-rod part is rotatably connected toone end of each second connecting-rod part and provided with a first locking structure. The other end of each second connecting-rod part is rotatably connected with one end of each third connecting-rod part and equipped with a second locking structure. The other end of each connecting-rod part is rotatably connected with each connection end and provided with a third locking structure. The spacingdistance adjusting device for the percutaneous pedicle screws can reliably and stably adjust the spacing distance of the two percutaneous pedicle screws. Therefore, the pedicle screws are convenientlyscrewed such that connection rods and the pedicle screws are secured.

A fixing device for repairing a broken wall of a spinal pedicle comprises an expansion fixing sleeve and a head film sleeve, wherein the head film sleeve is used for sealing the head of the expansion fixing sleeve; a pedicle screw comprises a pedicle screw fixing threaded section and a pedicle screw fixing seat; the pedicle screw fixing seat is provided with a pedicle screw fixing seat threaded hole and a pedicle screw fixing seat connecting slot; the pedicle screw fixing seat threaded hole is provided with a countersunk head fixing nut; the expansion fixing sleeve is provided with an eccentric threaded hole; the pedicle screw fixing threaded section is matched with the eccentric threaded hole; the expansion fixing sleeve comprises a expansion fixing sleeve body, a first expansion plate and a second expansion plate; the first expansion plate and the second expansion plate are arranged on the head of the expansion fixing sleeve body; a broken wall repairing block which is projected outwards is arranged on a side part of the expansion fixing sleeve, therefore, the expansion fixing sleeve is firmly fixed on a spine; the pedicle screw is mounted firmly; and the circumstance that the expansion fixing sleeve cannot be fixed firmly due to loosening of the pedicle screw is avoided.

The invention relates to a polyaxial pedicle screw fixing device with a self-breaking screw and belongs to the technical field of medical equipment. The fixing device is the main part of a spine and thoracolumbar spine posterior approach internal fixation system and used for fast assembling a pedicle screw and a fixing rod. The polyaxial pedicle screw fixing device comprises a screw seat, the self-breaking screw, a pressing block, a screw head and a C-shaped clamp ring and is characterized in that two symmetrically U-shaped grooves are arranged in the lateral wall of one side of the screw seat, an implanting hole is arranged inside the screw seat, an axial groove is arranged inside the implanting hole, the outer lateral wall of the pressing block is provided with a protrusion correspondingto the axial groove, the screw head and the pressing block are connected in a sleeved manner, the C-shaped clamp ring is embedded into an annular groove in the bottom of the screw seat, and self-breaking screw is connected with the upper portion of the screw seat through a rectangular thread. The polyaxial pedicle screw fixing device has the advantages that the device is simple to operate, capable of achieving fast fixing, capable transmitting large torque and capable of preventing the thread abrasion of the self-breaking screw, the twisting off torque of the self-breaking screw is consistent, quantification locking is achieved, and surgery efficiency and accuracy are increased.

The invention provides a connection adapter for pedicle screws. The connection adapter is used for connecting pedicle screws (8) with a connector (4). The connection adapter (6) comprises an adapter main body part (61), a mating connecting part (62) is formed in the adapter main body part (61) and used for matching and connecting with at least one part of the connector (4); the connection adapter further comprises a mobile head (64), the mobile head (64) is used for matching and connecting with the pedicle screws (8), the mating connecting part (62) comprises a mating jack (621) formed in the adapter main body part (61), the mating jack (621) is used for matching and receiving at least one portion of the connector (4), a mobile head jack (611) for receiving the mobile head (64) is formed in the adapter main body part (61), and the extension direction of the mobile head jack (611) is perpendicular to the axial direction of the mating jack (621). The invention further provides a fixing system for pedicle screws.