US Patent 10143797 Injection mechanism utilizing a vial

An injection device is provided for delivering a liquid medicament. The injection device includes a housing with a first chamber for storing a supply of the medicament. The first and second chambers are coupled within the housing. The second chamber is in fluid communication with the first chamber. The injection device also includes an outlet port for dispensing the medicament outside the housing. The outlet port is coupled to the housing and in fluid communication with one of said first and second chambers.