168results about How to "Prolong surgery time" patented technology

The invention discloses a method for preparing brain tissue and vascular entity composite model based on MRI (magnetic resonance imaging) and CTA (CT angiography). The method includes: 1), acquiring image data of head and neck skull, brain tissue, vessel and arterial aneurysm; 2), leading acquired MRI and CTA original image data into three-dimensional reconstruction software, structuring a 3D composite virtual model containing the skull, brain tissue, vessel and arterial aneurysm and outputting to a 3D printer for 3D model printing in a format that the 3D printer can print to acquire the three-dimensional entity composite model containing the skull, brain tissue, vessel and arterial aneurysm. The model is quite high in simulation degree, so that doctors can perform preoperative discussionof surgical planning, preoperative risk assessment and design of operative route or even simulate operation in combination with the model; the brain tissue model is of fluid silicone brain tissue thatcan be pulled apart and can be pulled apart as in actual operation, so that the doctors are more confident, and operation risks are lowered.

A system of instruments is provided for vitrectomy surgery, comprising a sharp trochar, a cannula and a cannula valve cap. The sharp trochar provided also has applicability to other fields of surgery. The sharp trochar has a hollow-ground blade that reduces the force necessary for insertion and upon removal leaves a wound with improved healing characteristics. The trochar is selectably insertable in a cannula, and in a preferred embodiment the cannula and the trochar are adapted with mutually tapered exterior surfaces to as to define a smooth transition in diameter to further facilitate insertion. A sealing valve cap is also provided for the cannula, designed to provide sealing while reducing the force required in for inserting instruments into the cannula. A method for angled insertion of this assembly is also disclosed.

In order to provide an audio signal amplification method and apparatus capable of directly connecting a load such as a speaker to a driver unit of a class-D amplifier without an LC filter, an output data from a ΔΣ converter 31 for compressing a digital audio data from a digital audio source is applied to a pulse width modulator 33 by way of a low pass filter 32 and a driver unit is controlled by a driver control circuit 35 by way of a delay device 34. A speaker 37 as a load is directly driven by P output and N output from the driver unit 36.

The invention provides a subapical osteotomy locating guide plate and a manufacture method therefor. The subapical osteotomy locating guide plate belongs to assisting medical instruments. The subapical osteotomy locating guide plate comprises a locating occlusion plate (1), connecting rods (2) and maxillary osteotomy line guide plates (3). The locating occlusion plate (1) is provided with an initial tooth print (11) and is connected with the maxillary osteotomy line guide plates (3) via the connecting rods (2). Each maxillary osteotomy line guide plate (3) is provided with two screw holes (6). The maxillary osteotomy line guide plates (3) are provided with non-circular insertion grooves b (31). One end of each connecting rod (2) matches the corresponding insertion groove b (31). The subapical osteotomy locating plate solves the problem that no intermaxillary bone locating guide device is available in subapical osteotomy. When the subapical osteotomy locating guide plate is applied to assist doctors with surgeries, the current most common complication of subapical osteotomy can be prevented.

The invention discloses a modeling method of a necrosis caput femoris restoring model based on an umbrella-shaped caput femoris supporter. The modeling method comprises the steps that firstly, a three-dimensional model of a to-be-restored caput femoris is obtained, wherein the NURBS curved surface model of the to-be-restored caput femoris is obtained, the to-be-restored caput femoris is a caput femoris which exists in the thigh tissue necrosis area and is pre-restored by the caput femoris supporter, and the caput femoris supporter is composed of an umbrella-shaped supporter body and a supporting sleeve; secondly, the necrosis area needing to be separated is determined according to the shape of the umbrella-shaped supporter body, and a necrosis caput femoris model is established; thirdly, a caput femoris supporter model is established; fourthly, a necrosis caput femoris implantation model is established, wherein the necrosis caput femoris implantation model with an implantation channel and a three-dimensional model of an implanted bone are established; fifthly, the necrosis caput femoris restoring model is established. The modeling method is simple in step, reasonable in design, convenient to achieve and good in using effect, the restoring model of the caput femoris supporter implanted into the necrosis caput femoris can be easily, conveniently and quickly established, and the quality of the established restoring model is high.

Provided is an endoscopic surgical device and an overtube with which a surgeon can easily obtain a desired image and operability is high. The overtube includes a slider within an overtube body, which guides an endoscope and a treatment tool into a body cavity. An endoscope-coupled part and a treatment tool-coupled part are provided inside the slider, and the slider has a dead zone where the forward and backward movement of either the endoscope or the treatment tool does not interlock with the movement of the other and a sensing zone where the forward and backward movement of either the endoscope or the treatment tool interlocks with the movement of the other. F1>F2 is satisfied when a fixing force for fixing the endoscope-coupled part to the endoscope tool is defined as F1 and a fixing force for fixing the treatment tool-coupled part to the treatment tool is defined as F2.

A method for automatically monitoring the penetration behavior of a trocar held by a robotic arm and monitoring system is provided. The method and system automatically monitors the penetration behavior of a trocar held by a robotic arm and/or an instrument guided through the trocar into a body cavity through an incision in the surface of the body of a patient during a surgical procedure. At least one measured value is recorded, by which a change in a force effect on the surface of the body of the patient may be determined, and automatic evaluation of the measured value with regard to a reference measured value is conducted. Comparison of the change in the measured value or the change in the force effect with a threshold value is made, and an indication in the event of the threshold value being exceeded is outputted.

The overtube includes a slider within an overtube body, which guides an endoscope and a treatment tool. An endoscope-coupled part and a treatment tool-coupled part are provided inside the slider, and the slider has a dead zone where the forward and backward movement of either the endoscope or the treatment tool does not interlock with the movement of the other and a sensing zone where the forward and backward movement of either the endoscope or the treatment tool interlocks with the movement of the other. The overtube body includes a distal-end-side stopper and a base-end-side stopper that restrict the movable range of the slider. A length L from a coupling position of the endoscope to a distal end position of the overtube body and a length Ls from the coupling position of the endoscope to a distal end position of the endoscope are set to satisfy Ls≧L.

Provided is an endoscopic surgical device and an overtube with which a surgeon can easily obtain a desired image and in which operability is high. The overtube includes a slider within an overtube body, which guides an endoscope and a treatment tool into a body cavity. An endoscope-coupled part and a treatment tool-coupled part are provided inside the slider, and the slider has a dead zone where the forward and backward movement of either the endoscope or the treatment tool does not interlock with the movement of the other and a sensing zone where the forward and backward movement of either the endoscope or the treatment tool interlocks with the movement of the other. The overtube body is configured to allow the treatment tool to rotate around an axis thereof without changing the positional relationship of the endoscope and the treatment tool with respect to the overtube body.

The invention discloses a suction catheter. The suction catheter comprises a catheter body and a balloon which is connected to the outside of the catheter body and is used for stopping blood flow after expanding; a guide wire infusion cavity for infusing normal saline and/or circulating blood flow, a suction cavity for absorbing thrombi under negative pressure and a balloon cavity for inflating and deflating the balloon are formed in the catheter body; a guide wire is detachably inserted in the guide wire infusion cavity; the guide wire infusion cavity communicates with two sides of the balloon and comprises a positioning section for penetrating through the thrombi; and the positioning section and a suction opening of the suction cavity are arranged on the same side of the balloon. According to the suction catheter, the balloon stops blood flow, the suction cavity can provide the negative pressure, the guide wire infusion cavity can form cavities communicating with the two sides of theballoon, blood flow and/or normal saline are/is provided for thrombus far ends from the guide wire infusion cavity to increase the pressure of the thrombus far ends, difference between pressures of the two sides of a thrombus can be increased under cooperation of the suction cavity, thrombi are pushed to the suction opening, and the suction effect can be improved.

A staining composition for staining an ophthalmic membrane when performing the ophthalmic membrane removal, wherein the staining composition comprises a Brilliant Blue G (BBG) derivative as a primary component.

The invention discloses a plastic artificial bone which contains, by weight, 50%-90% of porous calcium phosphate ceramic and 50%-10% of soluble collagen. The soluble collagen forms a three-dimensional collagen fiber net structure in gaps of the porous calcium phosphate ceramic. A preparation method of the plastic artificial bone comprises the steps that the porous calcium phosphate ceramic is firstly and ultrasonically rinsed, and then collagen pretreatment A and collagen pretreatment B are performed; then, the porous calcium phosphate ceramic is put in pretreatment collagen A and pretreatment collagen B for infiltration and coating, freeze-drying and crosslinking are performed to obtain the plastic artificial bone. The adverse influence of matrix metalloproteinase (MMP-2 and MMP-9) and Stromelysins and Matrilysin on wounds is weakened through the collagen pretreatment A, and the mechanical strength of the plastic artificial bone is enhanced through the collagen pretreatment B. The plastic artificial bone has a uniform three-dimensional structure through coating and then freeze-drying and crosslinking, and the repair of the bone tissues can be better guided and accelerated.

An overtube includes a slider within an overtube body, which guides an endoscope and a treatment tool into a body cavity. An endoscope-coupled part and a treatment tool-coupled part are provided in the slider, and the slider has a dead zone where the forward and backward movement of either the endoscope or the treatment tool does not interlock with the movement of the other and a sensing zone where the forward and backward movement of either the endoscope or the treatment tool interlocks with the movement of the other. A fluid-supplying connector that is provided on a base end surface of the overtube body, and has an axial direction that is made parallel to a longitudinal axis of the overtube body, and is detachably connected to an air supply tube for sending fluid into the body cavity through an internal space of the overtube body.