[0089] In the example of FIG. 5, as pieces of the thrombus are removed, such as by circulating a small amount of aspiration fluid (e.g., saline) through catheter 12 or oscillating positive and negative pressure to catheter 12 from fluid pump 18, pieces of thrombus may be removed, such that fluid flow may begin to increase (T3). As fluid flow increases, the fluid flow may exceed the particular fluid flow threshold such that fluid flow sensor 16 may begin producing vibrations that may be detected by the clinician and that correspond to fluid flow through from catheter 12 to fluid pump 18. These vibrations may indicate to the clinician that fluid is flowing from catheter 12 to fluid pump 18, such that removal of the thrombus is progressing. In some instances, such presence of vibrations may indicate to the clinician that the clinician may reposition catheter 12, such as by advancing catheter 12 further into vasculature of the patient. If the fluid flow decreases or drops below the fluid flow threshold such that vibrations from fluid flow sensor 16 are reduced or absent, this change in vibrations may indicate to the clinician the more of the thrombus may be removed. If the fluid flow does not decrease or drop below the fluid flow threshold such that vibrations form fluid flow sensor 16 are not reduced and remain present, this lack of reduction in vibrations may indicate to the clinician that the thrombus has been removed. In the example of FIG. 5, the fluid flow may return to an unblocked fluid flow rate once the thrombus is removed (T$_{4}$). [0090] Various aspects of the disclosure have been described. These and other aspects are within the scope of the following claims.