Splitable Tissue Cutting Device

Tissue-cutting devices and methods thereof, where a tissue-cutting device is coupleable with a needle used to define a needle tract. The tissue-cutting device includes a blade that cuts the skin during insertion of the device in a needle track to enlarge to needle tract. The tissue-cutting device can be configured for lateral separation from an elongate medical device (e.g., a guidewire). The tissue-cutting device can include a channel for receiving the elongate medical device. The channel can be configured to (i) retain the elongate medical device within the channel in the absence of a deliberate action by the clinician and (ii) facilitate lateral removal of the elongate medical device from the channel in response to the deliberate action. A needle assembly includes a needle coupled with the tissue-cutting device. The tissue-cutting device may include a sheath extending along a distal portion of the tissue-cutting device.