Abstract: A device and method for injecting a blade onto a surgical instrument and extracting a blade from a surgical instrument. The injector includes a housing having an elongated cavity for receiving the instrument head. Prior to injection, a blade is retained in the cavity. To inject a blade, a user inserts the instrument head into the channel. The rim of the blade aperture engages the groove on the tang as the instrument is inserted. When the tang is fully engaged with blade, the user can withdraw the instrument with the blade mounted on it. The extractor includes a housing having an elongated cavity for receiving the instrument head. The channel has a slot that extends through the housing. A spring catch is mounted in the cavity on a side wall opposite the spring clip. To extract a blade, a user inserts the instrument head into the channel until the spring catch engages the proximal end of the blade.