SUPPORT STRUCTURE FOR A WEARABLE MEDICAL DEVICE WITH ADJUSTABLE FASTENER

1 . A wearable cardioverter defibrillator (WCD) system, comprising:

a support structure configured to be worn by a patient using the WCD system;

an energy storage device configured to store electric charge for providing therapy to the patient;

an output circuit coupled to the energy storage device;

one or more sensors coupled to the support structure;

one or more therapy electrodes coupled to the support structure and the output circuit;

a processor configured to:

receive one or more output signals from the one or more sensors,

determine at least in part based on the received one or more output signals whether the patient has a shockable arrhythmia,

responsive to a determination that the patient has a shockable arrhythmia, cause electric charge from the energy storage device to be delivered to the patient via the output circuit and the therapy electrodes; and

an adjustable ratchet-type fastener, attached to the support structure, configured to removably fasten first and second portions of the support structure to each other and further configured to be adjusted by the patient to adjust a fit of the support structure on the patient while the patient is wearing the wearable medical device.

2 . The WCD system of claim 1 , wherein the ratchet-type fastener has an adjustment increment between ⅛ inch to ½ inch.

3 . The WCD system of claim 1 , wherein the ratchet-type fastener is further configured to enable a patient wearing the wearable medical device to adjust the fit of the support structure without unfastening the first and second portions from each other.

4 . The WCD system of claim 1 , wherein the ratchet-type fastener is further configured to enable a patient wearing the wearable medical device to adjust the fit of the support structure while wearing clothing over the support structure and without having to adjust the clothing to view or access the ratchet-type fastener.

5 . The WCD system of claim 1 , wherein the ratchet-type fastener comprises a side-squeeze mechanism configured to disengage a pawl from a tooth of the ratchet-type fastener.

6 . A wearable medical device, comprising:

a support structure;

one or more sensors coupled to the support structure;

circuitry operatively coupled to the one or more sensors to receive one or more output signals from the one or more sensors; and

an adjustable ratchet-type fastener, attached to the support structure, configured to removably fasten first and second portions of the support structure to each other and further configured to be adjustable by a patient to adjust a fit of the support structure on the patient while the patient is wearing the wearable medical device.

7 . The wearable medical device of claim 6 , wherein the ratchet-type fastener has an adjustment increment between ⅛ inch to ½ inch.

8 . The wearable medical device of claim 6 , wherein the ratchet-type fastener is further configured to enable a patient wearing the wearable medical device to adjust the fit of the support structure without unfastening the first and second portions from each other.

9 . The wearable medical device of claim 6 , wherein the ratchet-type fastener is further configured to enable a patient wearing the wearable medical device to adjust the fit of the support structure while wearing clothing over the support structure and without having to adjust the clothing to view or access the ratchet-type fastener.

10 . The wearable medical device of claim 6 , wherein the one or more sensors comprise ECG sensors.

11 . The wearable medical device of claim 6 , wherein the ratchet-type fastener comprises a side-squeeze mechanism configured to disengage a pawl from a tooth of the ratchet-type fastener.

12 . A wearable medical device, comprising:

a support structure;

one or more sensors coupled to the support structure;

circuitry operatively coupled to the one or more sensors to receive one or more output signals from the one or more sensors; and

an adjustable cinch-type fastener, attached to the support structure, configured to removably fasten first and second portions of the support structure to each other and further configured be adjustable by a patient to adjust a fit of the support structure on the patient while the patient is wearing the wearable medical device.

13 . The wearable medical device of claim 12 , wherein the cinch-type fastener is substantially continuously adjustable.

14 . The wearable medical device of claim 12 , wherein the cinch-type fastener is further configured to enable a patient wearing the wearable medical device to adjust the fit of the support structure without unfastening the first and second portions from each other.

15 . The wearable medical device of claim 12 , wherein the cinch-type fastener is further configured to enable a patient wearing the wearable medical device to adjust the fit of the support structure while wearing clothing over the support structure and without having to adjust the clothing to view or access the cinch-type fastener.

16 . The wearable medical device of claim 12 , wherein the wearable medical device comprises a wearable cardioverter defibrillator.

17 . The wearable medical device of claim 12 , wherein the one or more sensors comprise ECG sensors.