| 摘要 |
A trephine guide having an upper guide member 2 having a first circular guide aperture and a first circumferential portion 4 and a lower guide member 12 having a second circular guide aperture 14 and a second circumferential portion 16. The upper and lower guide members are connected in a spaced apart configuration by at least one arm 20, such that the first and second guide apertures are substantially concentric to allow a trephine 40 to pass through the upper and lower guide members. The arm 20 has a width that extends over less than three quarters of the circumference of the first or second circumferential portions to allow good visibility to a trephine blade 40. The lower guide member 12 may have a channel 24 for connection to a vacuum source. Protrusions 30 are provided to aid gripping. |
