On-bright Electronics (shanghai) Co., Ltd.

Shanghai Reach Medical Instrument Co., Ltd.

The Fourth Military Medical University of the Chinese People's Liberation Army

Shanghai Yiwo Information Technology Co., Ltd.

The Fourth Military Medical University

Fourth Military Medical University of Chinese People's Liberation Army

Xiaomin Huang

Lieyi Fang

Yuan Lin

Qiang Luo

Huawei Lyu

Yaming Cao

Xiuhong Zhang

Yunchao Zhang

Xiangkun Zhai

Chao Yao

Yun Sun

Penglin Yang

Huawei Lv

Dongze Yang

Zhuojing Luo

Xiaozhi Kang

Ming Zhao

Pei Cai

Lulu Han

Hongwei Zhao

Controller and method for a power converter. For example, the controller includes: a first terminal configured to receive a first voltage; a second terminal connected to a capacitor and biased to a second voltage; a voltage detector configured to receive the second voltage from the second terminal and generate a detection signal based at least in part on the second voltage; a charging controller configured to receive the detection signal and generate a first control signal based at least in part on the detection signal; and a charging current generator configured to receive the first voltage from the first terminal and receive the first control signal from the charging controller; wherein the voltage detector is further configured to: detect that the second voltage has decreased to a first predetermined threshold; and generate the detection signal indicating that the second voltage has decreased to the first predetermined threshold.

Systems and methods for providing power to pulse-width-modulation controllers of power converters during normal operation

A post-bone-grafting expandable cage includes a main body, a blade assembly fitted to the main body, and a pushing assembly fitted to the blade assembly, wherein an end cover is interference-fitted on one end face of the main body. The main body comprising a screw section, a side section integrally connected to two ends of the screw section respectively, and an opening section integrally connected to the side section. The pushing assembly includes a first U-shaped base and a threaded rod fixedly connected to the first U-shaped base. The threaded section of the threaded rod extends out of an end face of the first U-shaped base, a square cylindrical section of the threaded rod penetrates the first U-shaped base. The threaded section of the threaded rod is threadedly matched with the threaded through-hole, and the first U-shaped base is provided in a fitting manner with the blade assembly.

Post-bone-grafting expandable cage

The invention provides a dual-purpose handle, comprising a body, wherein mounting holes are provided in the body and are used for connecting to functional members; the mounting holes are provided in the body in both an axial direction and a radial direction; axial and radial mounting holes provided in the body can enable the handle and the functional members to easily and quickly switch between two connection forms, i.e. straight and T-shaped; and torsional torques that are different in magnitude can be output by means of different connection manners under the action of the same operation force. Clamping devices fitted with the functional members are arranged in the mounting holes; and when the functional members are connected to the handle, the clamping devices can fix the functional members and prevent same from rotating in a cavity of the body of the handle. The axial and radial holes of the handle are configured to be through holes, so that the handle can be adapted to guide needles of different sizes passing through same and is suitable for minimally invasive surgery, thereby further expanding the range of use of the handle.

Dual-use handle

The invention provides a nonmetal implant screw locking structure, which has the advantages of simple structure, novel design, simple production and processing, and convenient clinical operation. In addition, the structure of the invention can be used for orthopedic nonmetal implants such as the bone injury repair plate, spinal fusion cage, spinal fixation plate, posterior cervical single trapdoor plate, posterior cervical plate, lumbar anterior plate and lumbosacral plate, bringing good economic and social benefits gradually.

Nonmetallic implant screw locking structure

A method for reconstructing a three-dimensional space scene based on photographing is disclosed, comprising the following steps: S, importing photos of all spaces, and making the photos correspond to a three-dimensional space according to directions and viewing angles during capture, so that a viewing direction of each pixel, when viewed from the camera position of the three-dimensional space, is in line with that during capture; S, regarding a room as a set of multiple planes, determining a first plane, and then determining all the planes one by one according to relationships and intersections between the planes; S, marking a spatial structure of the room by a marking system and obtaining dimension information; and S, establishing a three-dimensional space model of the room by point coordinate information collected in the step S. In the present disclosure, the three-dimensional space model of a scene including dimensions and texture can be restored with no details lost; meanwhile, the three-dimensional space scene can be edited and modified quickly and conveniently, and a two-dimensional floor plan with dimensions and adequate accuracy can also be generated.

Method for reconstructing three-dimensional space scene based on photographing

The invention provides a pair of dual-purpose forceps, comprising a first forceps body and a second forceps body. When the first forceps body is connected with the second forceps body by means of a first pressurizing connecting member and a second pressurizing connecting member, a first handheld member and a second handheld member move towards each other, and a first pressurizing functional member and a second pressurizing functional member also move towards each other to complete pressurizing; when the first forceps body is connected with the second forceps body by means of a first opening connecting member and a second opening connecting member, the first handheld member and the second handheld member move towards each other, and a first opening function member and a second opening function portion face away from each other to complete opening. The dual-purpose forceps is simple in structure and is operated conveniently so that the double-purpose forceps can switch freely between opening and pressurizing functions conveniently and quickly.

Double-purpose forceps

The invention provides an expanding blade, comprising a first snap-fit portion, a second snap-fit portion, a fixation portion, a partition panel and hook edges, wherein, the first snap-fit portion has an axial flat section on one side; the second snap-fit portion is connected with the first snap-fit portion at one end and fixed to the fixation portion at the other end, and a convex locating block is arranged on the side wall of the second snap-fit portion; the partition panel is connected with the fixation portion at one end, the hook edges which are inclined outwards is arranged at the other end, and both the fixation portion and the hook edges are arranged on the same side of the partition panel. In addition, the invention also puts forward a unidirectional expanding device and a bidirectional expanding device which use the expanding blade. In this application, two fastening structures, i.e. the first snap-fit portion and the second snap-fit portion, arranged for the expanding blade can be snap-fitted in with different devices using different installation methods. Both the unidirectional expanding device and the bidirectional expanding device can also use the same kind of expanding blades, which reduces the number of instruments used in operations and lowers the cost, and both of them are simply fastened with simple structures, which is convenient for disassembly, assembly and replacement.

Expanding blade, unidirectional expanding device and bidirectional expanding device

The invention provides a screw pegging device. The screw pegging device comprises a holding handle, a handle rod, a sleeve and a screw part, wherein the sleeve is provided with a perforative cavity, and clamping grooves are arranged at two ends of the cavity; a groove opening running through the cavity is arranged in the side wall of the sleeve, a limiting clamping part is arranged in the groove opening, one end of the limiting clamping part is connected with the groove opening, and the other end of the limiting clamping part is provided with a convex clamping edge; the screw part is a long rod, one end of the long rod is provided with a screw head, a first clamping part is arranged at the joint of the long rod and the screw head, and an annular groove edge is arranged on the side wall of the long rod; and the holding handle sleeves one end of the handle rod, the other end of the handle rod is inserted and clamped in a third clamping groove of the sleeve, an axial insertion hole is formed in the handle rod, the long rod runs through the cavity and is inserted and embedded in the insertion hole, a fourth clamping groove is in clamping connection with the first clamping part, and the convex clamping edge is embedded and clamped in the annular groove edge. In the screw pegging device, the firm connecting is guaranteed by utilizing the clamping groove structure, the screw part long rod extends into the handle rod, then the strength of the joint of the handle rod and the screw part is enhanced, meanwhile, through the limiting clamping part, the axial limiting fixing is realized between the sleeve and screw part, and the disassembly is convenient.

Screw pegging device

Systems and methods are provided for protecting a power conversion system. A system controller includes a two-level protection component and a driving component. The two-level protection component is configured to detect an output power of a power conversion system and generate a protection signal based on at least information associated with the output power. The driving component is configured to generate a drive signal based on at least information associated with the protection signal and output the drive signal to a switch associated with a primary current flowing through a primary winding of the power conversion system. The driving component is further configured to generate the drive signal corresponding to a first switching frequency to generate the output power equal to a first power threshold and generate the drive signal corresponding to a second switching frequency to generate the output power equal to a second power threshold.

Systems and methods for two-level protection of power conversion systems

System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes an operation-mode-selection component and a driving component. The operation-mode-selection component is configured to receive a first signal related to an output load of the power conversion system and a second signal related to an input signal received by the power conversion system and output a mode-selection signal based on at least information associated with the first signal and the second signal. The driving component is configured to receive the mode-selection signal and generate a drive signal based on at least information associated with the mode-selection signal, the driving signal corresponding to a switching frequency.

Systems and methods for voltage control and current control of power conversion systems with multiple operation modes

System and method for driving a bipolar junction transistor for a power converter. The system includes a current generator configured to output a drive current signal to a bipolar junction transistor to adjust a primary current flowing through a primary winding of a power converter. The current generator is further configured to output the drive current signal to turn on the bipolar junction transistor during a first time period, a second time period, and a third time period, the second time period separating the first time period from the third time period, drive the bipolar junction transistor to operate in a hard-saturation region during the first time period and the second time period, and drive the bipolar junction transistor to operate in a quasi-saturation region during the third time period.

Systems and methods for driving a bipolar junction transistor by adjusting base current with time

Systems and methods are provided for protecting a power conversion system. A system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to provide a drive signal to close and open a switch to affect a first current flowing through a primary winding of a power conversion system. The second controller terminal is configured to receive first input signals during one or more first switching periods and receive second input signals during one or more second switching periods. The system controller is configured to determine whether a temperature associated with the power conversion system is larger than a predetermined temperature threshold, and in response to the temperature associated with the power conversion system being larger than the predetermined temperature threshold, generate the drive signal to cause the switch open and remain open to protect the power conversion system.

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Shanghai, China

Xiaomin Huang