초록 ▼

A needle-less injector suitable for injecting fluid through a skin surface of a patient includes a housing, a driver, an intruding gas chamber activating mechanism and a trigger. The housing containing the fluid and a sealed gas storage chamber containing a gas. The driver forces the fluid out of th

A needle-less injector suitable for injecting fluid through a skin surface of a patient includes a housing, a driver, an intruding gas chamber activating mechanism and a trigger. The housing containing the fluid and a sealed gas storage chamber containing a gas. The driver forces the fluid out of the housing at a sufficient speed to pierce the skin surface of the patient. The intruding gas chamber activating mechanism is mounted in the housing to intrude through the sealed gas chamber to release gas seal into the housing. The trigger is operatively coupled to the intruding gas chamber activating mechanism to release the gas from the gas chamber into the housing to activate the driver to force the fluid out of the housing. The trigger is activated by moving the trigger towards and orifice in the housing and/or upon application of a predetermined amount of pressure to the trigger that is opposed by a predetermined amount of resistance from the skin surface of the patient. The predetermined amount of resistance results from the housing having contact with the skin surface of the patient, and when this predetermined amount of resistance is reached the liquid medication is forced out of the housing by the driver to pierce the skin surface of the patient. In particular variations, the intruding gas chamber activating mechanism includes a valve member that is displaced and intrudes into the sealed gas chamber to release the gas from the gas chamber.

대표청구항 ▼

A needle-less injector suitable for injecting fluid through a skin surface of a patient includes a housing, a driver, an intruding gas chamber activating mechanism and a trigger. The housing containing the fluid and a sealed gas storage chamber containing a gas. The driver forces the fluid out of th

A needle-less injector suitable for injecting fluid through a skin surface of a patient includes a housing, a driver, an intruding gas chamber activating mechanism and a trigger. The housing containing the fluid and a sealed gas storage chamber containing a gas. The driver forces the fluid out of the housing at a sufficient speed to pierce the skin surface of the patient. The intruding gas chamber activating mechanism is mounted in the housing to intrude through the sealed gas chamber to release gas seal into the housing. The trigger is operatively coupled to the intruding gas chamber activating mechanism to release the gas from the gas chamber into the housing to activate the driver to force the fluid out of the housing. The trigger is activated by moving the trigger towards and orifice in the housing and/or upon application of a predetermined amount of pressure to the trigger that is opposed by a predetermined amount of resistance from the skin surface of the patient. The predetermined amount of resistance results from the housing having contact with the skin surface of the patient, and when this predetermined amount of resistance is reached the liquid medication is forced out of the housing by the driver to pierce the skin surface of the patient. In particular variations, the intruding gas chamber activating mechanism includes a valve member that is displaced and intrudes into the sealed gas chamber to release the gas from the gas chamber. e drive mechanism to a power limit once the variable reaches a value that corresponds to a power limiting pressure, the power limiting pressure being below the pressure hazard limit. 2. The injector of claim 1 wherein the drive mechanism comprises a motor and the sensor measures motor current. 3. The injector of claim 2 wherein the pressure monitor limits the motor current to a value corresponding to the power limiting pressure. 4. The injector of claim 1 wherein the power limit is predetermined for the injector. 5. The injector of claim 1 wherein the sensor measures exerted force or directly measures fluid pressure. 6. The injector of claim 1 wherein the power limit is set during operation of the injector. 7. The injector of claim 1 wherein the pressure hazard limit is set during operation of the injector. 8. The injector of claim 1 wherein feedback from the sensor is used to perform a periodic recalibration. 9. The injector of claim 1 wherein die difference between the power Iiiziiting pressure and the pressure hazard limit is sufficiently large to prevent nuisance stoppages of injection procedures. 10. The injector of claim 1, further comprising a syringe comprising a plunger operable to be driveti by the drive mechanism. 11. The injector of claim 10, further comprising: a control unit comprising a control unit housing and control circuitry disposed within the control unit housing; and a syringe interface module operably associated with the control unit, the syringe interface module comprising a module housing and a syringe intrface on the module housing that is adapted to connect the syringe to the module housing. 12. The injector of claim 11, further comprising a remote control in communication with the control unit. 13. An injector for use in injecting a fluid in a medical injection procedure, the injector comprising: a drive mechanism to pressurize the fluid; a sensor to measure a variable that is proportional to fluid pressure; and a pressure monitor in communication with the sensor and the drive mechanism, the pressure monitor operable to limit power input to the drive mechanism to a power limit once the variable reaches a value that corresponds to a power limiting pressure and to terminate the injection procedure if the value of the variable corresponds to a pressure hazard limit, the pressure hazard limit being greater than the power limiting pressure and the power limit being set during operation of the injector. 14. The injector of claim 13 wherein the drive mechanism comprises a motor and the sensor measures motor current. 15. The injector of claim 14 wherein the pressure monitor limits the motor current to a value corresponding to the power limiting pressure. 16. The injector of claim 13 wherein the pressure hazard limit is set during operation of the injector. 17. The injector of claim 13 wherein the sensor measures exerted force or directly measures fluid pressure. 18. The injector of claim 13 wherein the difference between the power limiting pressure and the pressure hazard limit is sufficiently large to prevent nuisance terminations of injection procedures. 19. The injector of claim 13, further comprising a syringe comprising a plunger operable to be driven by the drive mechanism. 20. The injector of claim 19, further comprising: a control unit comprising a control unit housing and control circuitry disposed within the control unit housing: and a syringe interface module operably associated with the control unit, the syringe interface module comprising a module housing and a syringe interface on he module housing that is adapted to connect the syringe to the module housing. 21. The injector of claim 20, further comprising a remote control in communication with the control unit. 22. An injector system for use in injecting a fluid in a medical injection procedure, the injector system comprising: a drive mechanism to pressurize the fluid; a control mechanism to control the flow rate of