Purpose: To validate the safety and effectiveness of xBar monitoring tool for detection of post-operative anastomotic leaks in subjects undergoing rectal/sigmoid resections with anastomosis.

The clinical team is blinded to the leak detection of the xBar system.

Study design: Pivotal, Prospective, Blinded, multi-center study. Study Population: This study will enroll approximately 190 eligible subjects undergoing scheduled colorectal surgery with anastomosis, without concomitant diversion.

xBar is an investigational device intended for post-op monitoring of patients undergoing GI surgery. The device is comprised of a surgical drain with embedded electrodes, connected to a small electronic device that records and relays data from the electrodes. The collected data is processed for early detection of complications.

Study description: The study is intended to validate the performance of the xBar system's anastomotic leak detection monitoring tool following colorectal resection with drain placement. During the index surgery the xBar device will be placed according to institution standard procedures and data recording will commence for a period of at least 3 days. Safety and complication detection performance will be evaluated retrospectively by comparing the diagnosis on a subject level done by the clinical team, who is blinded to xBar results, and the system.

Inclusion Criteria:

1. Age ≥ 22 years
2. Indication for sigmoid or rectal resection surgery.
3. Usage of drain during the surgery (to be confirmed during the surgery)
4. Willing and able to comply with the study follow up.
5. Able and agree to provide an informed consent.

Exclusion Criteria:

1. Contraindication for surgery and/or general anesthesia.
2. Pregnancy or lactation.
3. Planned or unplanned fecal diversion during the surgery (to be confirmed during the surgery)
4. Known electronic device implanted in the chest or the abdominal cavity (e.g., pacemaker, cardioverter/defibrillator).
5. Major medical or psychiatric illness or condition, or other factors that may affect general health or ability to adhere to the follow-up schedule.
6. Known allergic reactions to materials used in the components of the xBar system, i.e., silicone, rubber and stainless-steel.
7. Participation in another interventional study during the xBar system usage.

Investigators, clinical teams and subjects will be blinded to the outcomes provided by xBar system. Post operative monitoring will be as per SOC.