초록 ▼

The present invention is directed to a much safer and less expensive way of providing portable oxygen from a gas concentrator for patients who do not want to be tied to a stationary machine or restricted by present oxygen technology. In one preferred embodiment, the present invention splits off some

The present invention is directed to a much safer and less expensive way of providing portable oxygen from a gas concentrator for patients who do not want to be tied to a stationary machine or restricted by present oxygen technology. In one preferred embodiment, the present invention splits off some of the excess capacity gas flow from a gas concentrator which is then stored via liquefaction. The stored gas can then be used as a portable supply. A portion of the oxygen gas flow generated by the oxygen concentrator is channeled to a condenser which receives and liquefies the oxygen gas using cryocooler. A storage dewar is used for storing the oxygen liquefied by the condenser. Liquid is then selectively transferred to a smaller portable dewar. A controller can be used for monitoring the parameters of liquefaction, including oxygen concentration, the amount of liquid oxygen in the dewar, and for controlling the parameters of liquid oxygen generation and transfer. In one embodiment, the flow rate into the condenser is chosen to exceed the capacity of the condenser to minimize the liquefaction of argon, nitrogen and trace gases, and to purge the system. In another embodiment, condenser parameters are controlled in certain ranges and a unique condenser design is also disclosed. Also disclosed is a representative method for controlling the system using a microprocessor with a database and control functions which senses various parameters relating to the liquefaction, provides the microprocessor with the sensed parameters, calculates optimal conditions, and controls the liquefaction process.

대표청구항 ▼

The present invention is directed to a much safer and less expensive way of providing portable oxygen from a gas concentrator for patients who do not want to be tied to a stationary machine or restricted by present oxygen technology. In one preferred embodiment, the present invention splits off some

The present invention is directed to a much safer and less expensive way of providing portable oxygen from a gas concentrator for patients who do not want to be tied to a stationary machine or restricted by present oxygen technology. In one preferred embodiment, the present invention splits off some of the excess capacity gas flow from a gas concentrator which is then stored via liquefaction. The stored gas can then be used as a portable supply. A portion of the oxygen gas flow generated by the oxygen concentrator is channeled to a condenser which receives and liquefies the oxygen gas using cryocooler. A storage dewar is used for storing the oxygen liquefied by the condenser. Liquid is then selectively transferred to a smaller portable dewar. A controller can be used for monitoring the parameters of liquefaction, including oxygen concentration, the amount of liquid oxygen in the dewar, and for controlling the parameters of liquid oxygen generation and transfer. In one embodiment, the flow rate into the condenser is chosen to exceed the capacity of the condenser to minimize the liquefaction of argon, nitrogen and trace gases, and to purge the system. In another embodiment, condenser parameters are controlled in certain ranges and a unique condenser design is also disclosed. Also disclosed is a representative method for controlling the system using a microprocessor with a database and control functions which senses various parameters relating to the liquefaction, provides the microprocessor with the sensed parameters, calculates optimal conditions, and controls the liquefaction process. [US_PATENT]US-4237899, 19801200, Hagfors et al., 607/046; US-4326513, 19820400, Schulz et al., 128/203.14; US-4506666, 19850300, Durkan, 128/204.23; US-4681121, 19870700, Kobal, 128/203.14; US-4827935, 19890500, Geddes et al., 600/536; US-4830008, 19890500, Meer, 600/534; US-4928674, 19900500, Halperin et al., 600/495; US-5036848, 19910800, Hewson, 600/380; US-5056519, 19911000, Vince, 607/042; US-5146918, 19920900, Kallok et al., 607/002; US-5265604, 19931100, Vince, 607/042; US-5584290, 19961200, Brain, 128/204.22; US-5678535, 19971000, DiMarco, 128/200.24; US-5953713, 19990900, Behbehani et al., 128/204.18; US-6149670, 20001100, Worthen et al., 607/104; US-6198970, 20010300, Freed et al., 607/042; US-6213960, 20010400, Sherman et al., 601/041; US-6224562, 20010500, Lurie et al., 601/041; US-6360740, 20020300, Ward et al., 128/200.24