2results about How to "Realize linear control" patented technology

The invention discloses a mammary gland calcification focus dye positioning method and a dye positioning needle, and relates to the technical field of medical instruments.The dye positioning needle is used for being installed on a three-dimensional positioning arm of a molybdenum target host and comprises a needle cylinder, dye is contained in the needle cylinder, one end of the needle cylinder is provided with a liquid outlet end, and a piston is further arranged in the needle cylinder in a sliding mode; the piston is configured to drive the dye to be discharged from the liquid outlet end during sliding; the needle head comprises a base part and a needle tube, the base part is detachably mounted at the liquid outlet end of the needle cylinder, and the needle tube is used for guiding the dye discharged from the liquid outlet end to be injected into the breast so as to mark and position boundary dyeing of a breast focus. The dye positioning needle injects dye into the four boundaries of the innermost side, the outermost side, the uppermost end and the lowermost end of the mammary gland calcification focus under the guidance of the molybdenum target machine positioning system, and dye marking positioning is achieved. And meanwhile, dye mark positioning of the four boundaries is combined with center point positioning of the metal guide wire, so that crossed three-dimensional boundary positioning can be realized.

The present disclosure relates to the technical field of valves, and one embodiment of the present disclosure provides a safe pressure limiting control valve for a gas heating pipe network, which comprises a valve pipe, an upper end of the valve pipe is provided with a valve sleeve, extension plug-in assemblies are arranged on opposite sides of the valve pipe, a side wall of an expansion flange is provided with a limiting ring groove, a self-rotation ring is embedded in the limiting ring groove, a side wall of the self-rotation ring is provided with a plug-in sleeve, a side wall of the plug-in sleeve is provided with a plug-in inclined surface, and a plug-in thread groove is arranged in the plug-in inclined surface. Through the above technical scheme, the technical problem that the valve plug-in structure in the prior art is mostly designed with fixed specifications and cannot be flexibly adapted to pipelines with different diameters is solved. When different size pipelines need to be connected, the entire valve or an additional reducing pipe needs to be replaced, which not only increases construction cost and complexity, but also easily leads to a decrease in sealing performance due to multiple conversions, thereby burying a gas leakage risk.