1760 results about "Dry ice" patented technology

Devices and methods for cooling vessel walls to inhibit restenosis in conjunction with medical procedures such as coronary artery angioplasty. Stenosed vessel walls can be cooled prior to angioplasty, after angioplasty, or both. The invention is believed to inhibit restenosis through cooling to a temperature near freezing, preferably without causing substantial vessel wall cell death. One catheter device includes a distal tube region having coolant delivery holes radially and longitudinally distributed along the distal region. In some devices, holes spray coolant directly onto the vessel walls, with the coolant absorbed into the blood stream. In other embodiments, a balloon or envelope is interposed between the coolant and the vessel walls and the coolant returned out of the catheter through a coolant return lumen. Some direct spray devices include an occlusion device to restrict blood now past the region being cooled. Pressure, temperature, and ultrasonic probes are included in some cooling catheters. Pressure control valves are included in some devices to regulate balloon interior pressure within acceptable limits. In applications using liquid carbon dioxide as coolant, the balloon interior pressure can be maintained above the triple point of carbon dioxide to inhibit dry ice formation. Some cooling catheters are coiled perfusion catheters supporting longer cooling periods by allowing perfusing blood flow simultaneously with vessel wall cooling. One coiled catheter is biased to assume a coiled shape when unconstrained and can be introduced into the body in a relatively straight shape, having a stiffeninig wire inserted through the coil strands.

The invention relates to a device for comminuting dry ice granules, comprising a housing having a flow channel for dry ice granules which can be applied, by means of compressed gas, to a surface to be cleaned, and also comprising a first comminution member for comminuting the dry ice granules which are to be dispensed. In order to provide a device of this kind with which different degrees of comminution of dry ice granules can be achieved in a simple manner, it is proposed according to the invention that the device has at least one second comminution member which can be disposed in the housing in a position in which a total degree of comminution, which is greater than the individual degree of comminution which can be achieved solely by the first comminution member, can be achieved in combination with the first comminution member. A dry ice dispensing arrangement for dispensing a mixture of compressed gas and dry ice granules is also proposed, having a device of the above kind.

A nozzle for spraying sublimable solid particles and preventing frost from forming at surfaces of the nozzle. The nozzle includes: a cleaning agent block for phase-changing a cleaning agent into a snow containing sublimable solid particles; a nozzle block for growing the cleaning agent snow through adiabatic expansion and spraying the grown cleaning agent snow onto a surface of an object; a carrier gas block for supplying a carrier gas to the nozzle block to mix with the cleaning agent snow; and a heater for heating at least a portion of the carrier gas supplied from the carrier gas supply source. Fine dry ice particles and liquid CO2, passing through a solenoid valve from a CO2 reservoir tank and a pressure drop of a flow rate regulation valve, are introduced into the spray nozzle and then mixed with the carrier gas, such as N2 or purified air, and discharged.

A temperature regulation apparatus includes a dry ice module that encloses dry ice so that the module's outside surface is not hazardous to touch. Insulation, breathable material, or a combination of insulating and breathable materials, allows dry ice sublimation at a sufficiently slow rate within the attached dry ice module to control the ambient temperature in the area to be cooled. The dry ice module can be attached in a location that maximizes the dry ice cooling properties, typically at or near the top of the area to be cooled. Since sublimated carbon dioxide is heavier than normal air, it falls to the bottom of the area to be cooled and builds up. The venting placement in the dry ice module is based upon the make up of the dry ice module and the breathable materials inside of it.

The invention belongs to the technical field of nanometer material preparation and particularly relates to a method for preparing graphene powder by using a dry process. The method comprises the steps of firstly, carrying out microwave heat treatment on graphite to form pre-expanded graphite; placing pre-expanded graphite into a high-pressure-resistant peeling reactor, and adding dry ice or liquid nitrogen to peel at high pressure and high speed to obtain graphene. The method for preparing the graphene powder is simple in production equipment, few in process flow, free of oxidation reduction and subsequent acid treatment processes, environment-friendly and suitable for large-scale production; the prepared graphene powder is few in defect, good in conductivity and suitable for the application fields such as supercapacitors, sensors, sea water desalination and the like.

A case for a galley cart defines a cavity with at least two dividers positioned within the cavity, each having a first end edge and an opposing second end edge, with the dividers defining at least two chambers within the cavity. A door is movably attached to the case having a first position in which the cavity is accessible and a second position in which the cavity is substantially sealed. The door incorporates a housing having at least one cooling puck corresponding to at least a first one of the chambers and a second cooling puck corresponding to a second one of the chambers. At least one sealing member is coupled to the housing in the door and configured to compress against the first end edges of the dividers and to provide flow communication between the first cooling compartment and the first chamber and between the second cooling compartment and the second chamber when the door is in the second position.