The assembly 9, wherein the agent cartridge includes a dispensing port in fluid communication with the medical agent storage portion, and wherein the passage is configured such that it remains in fluid communication with the dispensing port as {HEAD ~ the member} is moved relative to {TAIL ~ the housing} 
The assembly 9 , wherein the agent cartridge includes a dispensing port in fluid communication with the medical agent storage portion , and wherein the passage is configured such that it remains in fluid communication with the dispensing port as { HEAD ~ the member } is moved relative to { TAIL ~ the housing }
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