An adjustable needleless injection system for subcutaneous injection of a liquid medication to a patient is disclosed. The adjustable needleless injection system may include: a medication cartridge that holds the liquid medication, where the medication cartridge includes a cartridge piston, a spring
An adjustable needleless injection system for subcutaneous injection of a liquid medication to a patient is disclosed. The adjustable needleless injection system may include: a medication cartridge that holds the liquid medication, where the medication cartridge includes a cartridge piston, a spring-actuated injector that may be coupled with the medication cartridge and configured to selectively apply force to the cartridge piston, and a charging mechanism configured to charge the spring-actuated injector based on a body type of the patient.
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1. An adjustable needleless injection system for subcutaneous injection of a liquid medication to a patient, comprising: a medication cartridge configured to hold the liquid medication, the medication cartridge including a cartridge piston;a spring-actuated injector coupled with the medication cartr
1. An adjustable needleless injection system for subcutaneous injection of a liquid medication to a patient, comprising: a medication cartridge configured to hold the liquid medication, the medication cartridge including a cartridge piston;a spring-actuated injector coupled with the medication cartridge and configured to selectively apply injection force to the cartridge piston, the spring-actuated injector including: a spring-loaded injector piston with ratchets formed in a symmetrical arrangement along a portion of the injector piston, the injector piston including an injector spring positioned to apply the injection force to the injector piston;a spring-loaded trigger engaged with the ratchets on the injector piston to hold the injector piston in place against the injection force applied by the injector spring, the trigger configured to selectively release the injector piston responsive to the trigger being pushed down, the injector piston configured to release to move responsive to the injection force applied by the injector spring, the injector piston configured to apply the injection force to the cartridge piston to force the liquid medication out of the medication cartridge; anda charging mechanism configured to charge the spring-actuated injector by applying a charging force to the injector piston to move the injector piston against the injection force of the injector spring by a predetermined distance, the charging mechanism including: a linear actuator configured to engage the injector piston, the linear actuator applying the charging force to the injector piston to move the injector piston against the injection force of the injector spring by the predetermined distance;a user interface unit configured to receive a body type from a user;a processor coupled with the charging mechanism; anda memory coupled to the user interface unit and the controller, the memory storing executable instructions to cause the processor to: receive the body type from the user interface unit;correlate the received body type with a required injection force;calculate the predetermined distance based on the required injection force; andcause the linear actuator to move the injector piston against the injection force of the injector spring by the predetermined distance. 2. The adjustable needleless injection system according to claim 1, wherein the ratchets on the injector piston are spaced apart by equal distances, each ratchet corresponding to an incremental injection force to be applied by the injector spring to the injector piston. 3. The adjustable needleless injection system according to claim 2, wherein the ratchets on the injector piston are spaced apart by at least 2 mm. 4. The adjustable needleless injection system according to claim 1, wherein the user interface unit configured to receive the body type from the user as parameters selected from the group consisting of body mass index, age, gender, and anatomical site of injection. 5. The adjustable needleless injection system according to claim 1, wherein the injector spring with a spring constant between 2 N/mm and 7 N/mm. 6. An adjustable needleless injection system for subcutaneous injection of a liquid medication to a patient, comprising: a medication cartridge configured to hold the liquid medication, the medication cartridge including a cartridge piston;a spring-actuated injector coupled with the medication cartridge and configured to selectively apply injection force to the cartridge piston, the spring-actuated injector including: a spring-loaded injector piston with ratchets formed in a symmetrical arrangement along a portion of the injector piston, the injector piston including an injector spring positioned to apply the injection force to the injector piston;a spring-loaded trigger engaged with the ratchets on the injector piston to hold the injector piston in place against the injection force applied by the injector spring, the trigger configured to selectively release the injector piston responsive to the trigger being pushed down, the injector piston configured to release to move responsive to the injection force applied by the injector spring,the injector piston configured to apply the injection force to the cartridge piston to force the liquid medication out of the medication cartridge; anda charging mechanism configured to charge the spring-actuated injector by applying a charging force to the injector piston to move the injector piston against the injection force of the injector spring by a predetermined distance. 7. The adjustable needleless injection system according to claim 6, wherein the charging mechanism includes a linear actuator engaging the injector piston, the linear actuator configured to apply charging force to the injector piston to move the injector piston against the injection force of the injector spring by the predetermined distance. 8. The adjustable needleless injection system according to claim 7, further comprising: a user interface unit configured to receive a body type from a user;a processor coupled with the charging mechanism; anda memory coupled to the user interface unit and the controller, the memory storing executable instructions to cause the processor to:receive the body type from the user interface unit;correlate the received body type with a required injection force;calculate the predetermined distance based on the required injection force; andcause the linear actuator to move the injector piston against the injection force of the injector spring by the predetermined distance. 9. The adjustable needleless injection system according to claim 6, wherein the injector piston comprises: a first portion in a form of a ratchet rod with ratchets formed along the first portion; anda second portion in a form of a rod that is separated from the first portion by an extended retainer; the injector spring positioned around the second portion against the extended retainer. 10. A method for charging a needle-free injector based on a body type of a patient receiving an injection, the method comprising: associating a spring-actuated needle-free injector with a charging mechanism, the spring actuated needle-free injector including an injector piston actuated by an injector spring and a trigger mechanism configured to hold the injector piston in place against the injection force applied by the injector spring; the charging mechanism including a linear actuator engaging the injector piston, the linear actuator applying charging force to the injector piston to move the injector piston against the injection force of the injector spring by a predetermined distance;receiving the body type;correlating the received body type with a required injection force;calculating the predetermined distance based on the required injection force; andmoving the injector piston against the injection force of the injector spring by the predetermined distance using the linear actuator. 11. The method according to claim 10, wherein calculating the predetermined distance based on the required injection force comprises calculating the predetermined distance utilizing Hooke's Law.
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