127 results about "Fracture sites" patented technology

A device for fracturing calcifications in heart valves characterised by a stabilizer assembly and an impactor assembly assembled on and deployed by a delivery system, wherein said delivery system is operable to cause relative motion between said impactor assembly and said stabilizer assembly with sufficient energy so as to fracture a calcification located in tissue which is sandwiched between said stabilizer assembly and said impactor assembly, wherein said impactor assembly and said stabilizer assembly have shaped impact delivery portions of which the footprint on the valve leaflets is shaped in accordance with a shape of desired fracture sites.

A pair of clamps are attached to a damaged bone one each side of a fracture site during a surgical reduction, one clamp on each side of the fracture site, after which the two clamps are slidably engaged to a single pivotal alignment bar, with the clamps then being adjusted to properly align the bone for a surgical attachment using a bone plate which is secured between the respective bone and each respective clamp, holding the bone in place with the bone in proper alignment for the attachment of screws through the plate into the bone, stabilizing the fracture site during the plate attachment procedure.

An orthopedic fixation system includes a compression plate member, a lag screw member, and a plurality of threaded screw members for applying compression across a fracture site. The compression plate member has a generally planar body, an upper surface, and bone contacting surface. The planar body includes a plurality of through-apertures and a hinged tab member having an elongated through aperture, which is adapted to receive the lag screw member and cause the tab member to recess towards a bone divot formed in the underlying bone. The compression plate member is also adapted to receive the plurality of screw members within the through-apertures for fixably and threadably coupling the compression plate member across a fracture site. The lag screw member applies a direct compressive force across the fracture site through the deformable tab that is recessed in the bone divot.

This application relates to methods and apparatus for monitoring hydraulic fracturing during oil/gas well formation. A fiber optic cable (102) deployed down a well bore (106), which may be the well bore in which fracturing is performed, is interrogated to provide a distributed acoustic sensor. Data is sampled from at least one longitudinal sensing portion of the fiber and processed to provide at least fracturing characteristic. The fracturing characteristic may comprise the characteristics of high frequency transients indicative of fracturing events (606). The intensity, frequency, duration and signal evolution of the transients may be monitored to provide the fracturing characteristic. Additionally or alternatively the fracturing characteristic may comprise the longer term acoustic noise generated by fracture fluid flow to the fracture sites. The intensity and frequency of the noise may be analyzed to determine the fracturing characteristic. The method allows real-time control of the fracturing process.

Provided herein are methods, devices and kits for reducing the risk of fracturing a bone. A device is provided comprising an implantable pad for absorbing, deflecting, and/or diffusing an exterior impact force on a bone. A device is provided for strengthening and/or reinforcing a bone at typical fracture sites prior to fracture and/or along lines of tension and compression forces. The devices may comprise a coil adapted to be implanted in the bone. The device may comprise a rod adapted to be implanted in the bone. The devices may comprise a deployable element adapted to be deployed in the bone. The device may comprise a scaffold adapted to be implanted in the bone. The device may comprise a reinforcing material and/or means for reinforcing and/or strengthening the bone at typical fracture sites prior to fracture and/or along lines of tension and compression forces.

Cervical fixation devices, systems and methods for repairing odontoid fractures to the C2 vertebral body, including an anchoring feature that crosses the fracture site to be positioned external to the fractured bone fragment and which provides compressive and radial forces externally to the bone to immobilize the bone fragment(s) for fixation to the main bone structure.

The invention discloses a shale bedding inner supporting agent transportation simulating device and an evaluation method. The shale bedding inner supporting agent transportation simulating device comprises a continuous liquid mixing system, an automatic sand mulling system, a control and data processing system and a bedding seam internal flow simulating system. The continuous liquid mixing systemis connected with the automatic sand mulling system, the automatic sand mulling system is connected with the bedding seam internal flow simulating system, and the bedding seam internal flow simulatingsystem is connected with the control and data processing system. According to the shale bedding inner supporting agent transportation simulating device and the evaluation method, slugging type sand adding, continuous sand adding and various liquid system mixed fracturing pump injection procedure simulation on a fracturing site can be achieved, quantitative evaluation of the supporting effects ofdifferent cracks is achieved, and the theoretical basis and experimental support are provided for on-site pump injection procedure simulation optimization and fracturing parameter quantitative evaluation.

A pair of clamps are attached to a damaged bone one each side of a fracture site during a surgical reduction, one clamp on each side of the fracture site, after which the two clamps are slidably engaged to a single alignment bar, with the clamps then being adjusted to properly align the bone for a surgical attachment using a bone plate. Each clamp provides axially adjustable plate retainers which slides along a track on the end of each segment of the each clamp to position the retainers at a location where the bone plate is to be attached to the bone. Upon positioning, the bone plate is held against the bone with the bone still in proper alignment wherein screws anchor the plate to the bone, stabilizing the fracture site during the plate attachment procedure.

The invention discloses a computer-aided design method for fracture reduction. The present invention determines the length and short principal axis of the broken section of the fracture, establishes a three-dimensional rectangular coordinate system, determines the quaternion representation of the vector on the central principal axis and its direction in the three-dimensional coordinate system, and selects the easy-to-operate fractured end as the distal end The fracture ends are rotated, rotated, and translated separately to obtain the coaxial optimal path point of the fracture ends, so as to realize the anastomosis of the fracture sections and complete the fracture reduction; the invention uses quaternion to represent the direction of the central axis of the two fracture ends. Vector, and then obtain the rotation axis and the rotation angle of each rotation, the quaternion is faster to solve when describing the rotation transformation, and can effectively avoid the occurrence of problems such as universal locks; the present invention rotates and spins the broken end of the fracture and translation operations to obtain the optimal coaxial trajectory point of the fracture end, which can provide effective information for doctors to diagnose and operate.

The invention relates to a gas extraction method for L-shaped borehole staged fracturing of a weakened coal seam roof, which comprises the following steps: 1) selecting the drilling position and parameters at the ground position corresponding to the working face of the coal seam to be mined, and constructing L 2) After the construction of the L-shaped borehole is completed, casings and fracturing equipment are arranged in the L-shaped borehole, and each preset fracturing site of the coal seam roof is fractured by means of hydraulic jet staged fracturing, to weaken the roof of the coal seam; 3) After the fracturing operation is completed, remove the fracturing equipment and connect the casing in the L-shaped borehole to the gas drainage device; 4) Start the coal mining operation at the coal mining face, and While the coal face is moving forward, the gas in the fracture zone is extracted through the gas extraction device. This solution solves the problems in the prior art that the amount of gas extraction is limited and the extraction intensity is not enough, and the coal seam gas cannot be extracted and utilized to a great extent.

A secondary battery has a safety vent formed on a can accommodating an electrode assembly. The safety vent is formed in a groove shape and the depth of the groove varies. The fracture site of the safety vent is controlled by adjusting the depth of the safety vent. The safety vent is prevented from damaging the electrode assembly when the electrode assembly is inserted in the can, and contacts the safety vent.

The invention belongs to the technical field of medical appliances, and particularly relates to an orthopedic nursing fixing device having an infrared function. Against the technical problems that theplaster fixation forming of an orthopedic fixing device is complex, the size of the orthopedic fixing device cannot be adjusted and whether edema and lesions occur at a fracture site cannot be monitored, the following technical scheme is provided. The orthopedic nursing fixing device includes a fixing nursing sleeve, the outer wall of one side of the fixing nursing sleeve is in seaming with a connecting zipper, the outer wall of the other side of the fixing nursing sleeve is in seaming with a sealing closing belt, and the fixing nursing sleeve is connected with a fixing supporting sleeve through the connecting zipper. According to the orthopedic nursing fixing device, limitation is performed through a fixed ring, to facilitate mounting and dismantling; gypsum forming is not required, andthe overall weight is alleviated; the fixing supporting sleeve and the fixing nursing sleeve form an L-shaped structure, so that a fixed structure is stable; the degree of tightness of a binding beltis automatically adjusted through a pressure sensor and an air bag, an infrared sensor can detect the abnormal temperature in a lesion or edema area, and timely reminding is performed for processing.

The invention discloses a simulation system for simulating a fracture healing process, which relates to the field of biochemical engineering. The simulation system is used for predicting the complex process of fracture healing and providing guidance for doctors in establishing a good surgical program for fracture healing. The system comprises a three-dimensional geometric modeling module, a finite element creation module, a fracture site biomechanical-modeling module, a fracture site cell evolution modeling module, a callus growth modeling module and a display module. Cell concentration and tissue material properties are updated by the fracture site biomechanical-modeling module and the fracture site cell evolution modeling module; the geometric shape of callus is updated by the callus growth modeling module; and the effect of fracture healing is judged by the display module. The simulation system can more accurately simulate the process of fracture healing and repetitively carry out experimental simulation for unlimited times, thus providing help for making the best surgical program for fracture healing.

A clamping device for bone reduction and internal fixation comprises a first clamp member and a second clamp member configured to have an upper section, a middle section and a lower section to define a scissor-like structure. The clamp members are hingedly attached to each other at a pivot point using a screw in the middle section. A pair of arcuate members configured in the upper section to define a first opening to receive and hold a fracture bone for reduction and a second opening in a U-shaped profile to define a substantially wide area to slidably receive a plate for the internal fixation simultaneously without removing the device during the surgery. The clamping device is used to secure the bones in comminuted fracture wherein the clamp members hold the bone rigidly to provide traction force to align the fracture site.

The invention discloses a fracture orthotic device for bone surgery. The device comprises two hoops, an opening of each hoop is provided with an adjusting bolt, a plurality of supporting plates are arranged between the two hoops, the supporting plates are uniformly arranged in a circle to form a shape of an annular array, the inner side of the annular array is provided with a fixing cover, the fixing cover is composed of a plurality of pressing blocks, transversal elastic ropes and longitudinal elastic ropes, the pressing blocks are arranged in a circle to form a columnar structure, the pressing blocks in each same row/line are connected through a transversal/longitudinal elastic rope, each supporting plate is provided with a screw hole, and each screw hole is internally in threaded connection with a pressing push rod used for withstanding a corresponding pressing block. The fracture orthotic device for bone surgery has the advantages that the design of the structure is reasonable, thedevice can take the place of plaster to fix a fracture site of a leg bone of a patient, so that on one hand, interspace is reserved between the fixing cover and the fracture site, and the breathability is better; on the other hand, pressures on each pressing block can be adjusted through the corresponding pressing push rod, the device is suitable to various leg types, the device can fit the fracture site better and be fixed better, and the orthotic function is achieved.

An isolation pocket form is placed on around a footing for a support column, and then covered with a lid which has a sharp peripheral rim extending upwardly. Concrete is then poured around and over the form and lid, forming an initially continuous concrete floor which can be used as a casting bed for making wall slabs. The sharp-bottomed grooves produced in the concrete by the rim are preferential fracture sites, so that, after the wall slabs have been removed, the concrete portion overlying the isolation pocket can easily and cleanly be broken out.

The invention discloses a quick evaluation apparatus of fracturing proppant particle size and an application method thereof. The quick evaluation apparatus of fracturing proppant particle size comprises: a baseplate, wherein the bottom of the baseplate is sealed, and the inner side of the upper portion of the baseplate is provided with a screw thread; a main screen drum for being arranged at the top of the baseplate, wherein the inner side of each of the upper and lower portions of the main screen drum is provided with a screw thread; an upper screen for being arranged at the top of the main screen drum, wherein the lower portion of the upper screen drum is provided with a screw thread; a drum cap for being arranged at the top of the main screen drum, wherein the top of the drum cap is sealed; a screen that may be arranged between the baseplate and the main screen drum and/or between the main screen drum and the upper screen in threaded manner. The quick evaluation apparatus of fracturing proppant particle size is suitable for quickly evaluating particle size composition of a proppant, and evaluation of the proppant at a fracturing site and evaluation of an indoor experimental proppant are facilitated.

The invention relates to the field of petroleum extraction, and in particular relates to a water-based fracturing fluid composition and a water-based fracturing fluid. The water-based fracturing fluidcomposition contains a thickening agent, a cross-linking agent, a fracturing auxiliary agent and water, and the water-based fracturing fluid composition is characterized in that the thickening agentis citric acid-modified welan gum. The water-based fracturing fluid is prepared from the above fracturing fluid composition through the following steps: mixing the thickening agent, the fracturing auxiliary agent and the water to obtain a base fluid; and mixing the base fluid and the crosslinking agent to form the water-based fracturing fluid. When the water-based fracturing fluid composition provided by the invention is used to prepare the water-based fracturing fluid, the citric acid-modified welan gum and the cross-linking agent can be subjected to a crosslinking reaction to form a freeze gel system with shear viscosity (80 DEG C@170 s<-1>, 90 min) maintained at 80 mPa.s or more, the shear viscosity is better than an industry standard of Q/SH 0351-2010 ''Technical Requirements of Water-Based Crosslinking chemicals'' and the water-based fracturing fluid meets the requirements of fracturing site construction.

A percutaneous metatarsal fixation guide, including methods of use, is provided. The percutaneous metatarsal fixation guide includes a means for aligning a drill guide bearing a drill sleeve with the central longitudinal axis of a fractured metatarsal, metacarpal, or similar bone. Precise radiographic alignment of the drill sleeve with the long axis of the fractured bone facilitates accurate placement of fixation hardware across the fracture site, allowing for healing in alignment. The fixation bearing two corresponding index wheels is rigidly mounted to a tarsal bone via a temporary threaded K-wire, wherein an index marking on a second index wheel coupled to a drill sleeve may be positioned to correspond with an index marking on first index wheel coupled to an alignment guide, such that the drill sleeve is aligned with the fractured metatarsal. This allows precise placement of fixation hardware, compared to using a conventional “free-hand” technique.