Abstract: A catheter insertion assembly for inserting a catheter into a body lumen of a patient is disclosed as well as a method of using the assembly. The assembly comprises a hub, a catheter stiffener and a valve. The valve is disposed in the lumen of the hub and prevents substantially all fluid flow through the lumen in at least one direction below a pressure threshold. The proximal end of the stiffener is attached to the hub and the stiffener extends distally of the distal end of the hub. The stiffener lumen is in fluid communication with the hub lumen. The stiffener occupies a lumen of the catheter and provides additional stiffness to the catheter such that a catheter introducer is not necessary for insertion of the catheter.

Abstract: A system and method for detecting leakage of a refrigerant and chemicals in an air conditioning and heating system. In some cases, a refrigerant may be inadvertently heated via a heating unit to produces dangerous chemicals. A detector can be installed near an air ventilator and can be utilized for detecting the leakage of refrigerant and chemicals that are dispersed in air by a ventilating system.

Abstract: A catheter insertion assembly for inserting a catheter into a body lumen of a patient is disclosed as well as a method of using the assembly. The assembly comprises a hub, a catheter stiffener and a valve. The hub has a proximal end, a distal end and a lumen connecting the proximal and distal ends. The valve is disposed in the lumen of the hub and prevents substantially all fluid flow through the lumen in at least one direction below a pressure threshold. The stiffener comprises a proximal end, a distal end and a central lumen. The proximal end of the stiffener is attached to the hub and the stiffener extends distally of the distal end of the hub, and the stiffener lumen is in fluid communication with the hub lumen. The stiffener occupies a lumen of the catheter and provides additional stiffness to the catheter such that a catheter introducer is not necessary for insertion of the catheter.

Abstract: The system is a universal code whose main purpose is to provide visually impaired people with much wanted personal independence. A mobility map of the invention comprises a series of embossed/engraved symbols and/or other raised pictographs combining Braille code and other alphanumeric symbols. This symbols are exposed atop of a surface, and will be composed of two different panels combined together to form a mobility map or plan. A multi-level hierarchy mobility system is also provided to allow visually-impaired individuals to move freely and relocate not only within a structure such as a building but also within many geographical levels such as states, cities, and neighborhoods without losing the structural and/or spatial relationship among the different levels.