Stereotaxic instrument ZH- Lansing D-type large-animal stereotaxic instrument currently in use can be divided into two categories: 1, linear (Rectilinear) or three planar (Triplanar). It is based on three imaginary three planes mutually perpendicular to each other to form three-dimensional rectangular coordinate space. A small structure deep in the brain, can be positioned according to the coordinate system. In use, the electrode moving from the shelves of the scale, read out the three-dimensional coordinate values ??of the electrode tip. 2, equatorial (Equatorial). It is composed of two right angles to each arc beam structure, in accordance with the principles of three-dimensional coordinates (Polar Coordinate) is made, it can be predetermined spatial location of brain structure, now used for people with a locator. This article focuses on linear perspective locator. The basic design principles of three-dimensional positioning, nothing more than the following three, using animal skull surface of certain anatomical landmarks, such as the sagittal suture, the central axis of the ear canal, the central portion of the inferior orbital rim, the anterior fontanelle Center (Bregma), herringbone stitch tip (Lamda) and other parts of the tooth root and home, relatively constant relationship with a brain surface and deep structures (such as nuclear, anterior commissure, etc.), in order to determine the location of the deep brain structures from the outside. 4, three-dimensional space with Cartesian coordinates, in millimeters, to describe the spatial location where the deep brain structures. 5, with a strong metal main frame, with several bars, folders, composition accurately, and bilaterally symmetrical headband, the animal's head by a certain number of parts as a fixed point of fixation (not allowed 1 / 5 mm of movement). 6, with a group of three-dimensional sliding feet, readable 1/10 mm electrode moving frame (the lower end of the scale of the decline branch is equipped with electrode holders) to guide enables accurate insertion of the electrode structure of the brain of a given . 7, the metal frame and the fixed frame electrode moving animal head, preferably two parts, with accurate when the electrode is securely mounted on a mobile frame metal frame. Features: 1, a variety of animal headband (standard one of For sold separately) can be used for a variety of experimental animals. Such as pigs, dogs, cats and some large animals, electrode holder slider moving the movable Fan turn longer. 2, the small number of components, the main frame thick, major components are the same kind of metal, it will give the same coefficient of expansion of the components, avoid contact with potential. Mobile frame with animal head electrode retaining clips mounted on the main frame. 3, electrode moving frame easy handling. When an animal head and perform surgical procedures, you can move the frame to remove the electrodes, the instrument became the first holder can be used independently. This ensures that the electrode is less susceptible to damage or move the frame touch crooked. 4, the instrument completely symmetrical upload multiple electrode moving frame, can simultaneously on both sides of the brain structures of the same name is inserted discharge electrode, or a plurality of electrodes inserted in the ipsilateral. 5, the electrode holder vertically mobile slider, the forward and rear left and right directions can be rotated a certain angle, the head of an animal for use in a fixed horizontal line, at an angle or inserting electrodes into the brain. 6, the electrode moving electrode holder retaining clip, easily understood requirements for flexible discharge, as implanted electrodes from the electrode easy to Matsushita. 7, each slider readings should be read more accurately a tenth of a millimeter. The main technical parameters: 1, Weight: about 30 kg 2, rail length: 400mm 3, rail spacing: adjustable 4, Accuracy: ± 0 .1mm 5, Material: alloy material 6, Dimensions: 950 × 450 × 500mm (general sizes to be designed to provide users) 7, the operating arm 360 degree rotation, swings 180 (± 90 °) 8, counting precision: ± 0.1mm 9, three-dimensional propeller accuracy: ± 0 1mm 10, three-dimensional pressing stroke: 80mm (X-axis: 80mm, Y-axis 80mm, Z-axis 80mm) 11, scale laser engraving