Surgical bur with controlled pooling

A surgical instrument, comprising:

• an outer tubular sleeve configured to receive a middle tubular member coaxially therethrough to define an irrigation pathway therebetween and therealong to a distal end of the outer tubular sleeve and a distal end of the middle tubular member, the outer tubular sleeve adapted to connect a source of irrigation fluid to the irrigation pathway;
• an inner shaft rotatably received within the middle tubular member, a distal end of the inner shaft forming a surgical bur configured to cut tissue or bone upon rotation thereof, the surgical bur extending distally beyond the distal end of the outer tubular sleeve;
• and
• at least one fluid exit cutout defined in the distal end of the outer tubular sleeve at the end of the irrigation passageway configured to direct irrigation fluid in a narrow stream toward the surgical bur, wherein an annular space between each respective fluid exit cutout at the end of the irrigation passageway is sealed to prevent irrigation fluid from obscuring the surgeon's view of the surgical bur.

A surgical instrument, comprising:

• an outer tubular sleeve configured to receive a middle tubular member coaxially therethrough to define an irrigation pathway therebetween and therealong to a distal end of the outer tubular sleeve and a distal end of the middle tubular member, the outer tubular sleeve adapted to connect a source of irrigation fluid to the irrigation pathway;
• an inner shaft rotatably received within the middle tubular member, a distal end of the inner shaft forming a surgical bur configured to cut tissue or bone upon rotation thereof, the surgical bur extending distally beyond the distal end of the outer tubular sleeve;
• and
• at least one fluid exit port defined proximate the distal end of the outer tubular sleeve at the end of the irrigation passageway configured to direct irrigation fluid in a narrow stream toward the surgical bur, wherein an annular space between each respective fluid exit port at the end of the irrigation passageway is sealed to prevent irrigation fluid from obscuring the surgeon's view of the surgical bur.