Removable fluid reservoir and ultrasonic surgical instrument including the same

An ultrasonic surgical instrument, comprising:

• a housing defining a barrel portion and a fixed handle portion extending from the barrel portion, the fixed handle portion defining an internal cavity and at least one cut-out portion, wherein the barrel portion comprises a proximal end, a distal end, and an intermediate portion defining a longitudinal axis, and wherein the fixed handle portion extends away from the intermediate portion at an angle transverse to the longitudinal axis of the barrel portion;
• an ultrasonic transducer received at least partially within the barrel portion of the housing;
• a waveguide defining a longitudinal axis and an internal lumen, operably coupled to the ultrasonic transducer, and extending distally from the housing to a blade configured to treat tissue with ultrasonic energy produced by the ultrasonic transducer and transmitted along the waveguide, wherein the waveguide is arranged substantially coaxial with the barrel portion;
• a fluid management system disposed within the housing, the fluid management system including an inflow needle and an outflow needle;
• and
• a fluid reservoir releasably engageable within the internal cavity of an open lower end of the fixed handle portion of the housing with at least a portion of the fluid reservoir exposed through the cut-out portion of the fixed handle portion, the fluid reservoir including a body, a leading end, and a trailing end enclosing a fluid chamber configured for storing fluid therein, the fluid reservoir further including inflow and outflow ports disposed at the leading end and a heat exchanger disposed at the trailing end,
• wherein, upon engagement of the fluid reservoir within the internal cavity, the inflow port operably couples to the inflow needle and the outflow port operably couples to the outflow needle to enable fluid from the fluid reservoir to be delivered distally through the internal lumen and returned proximally from the internal lumen.