Set up oxygen and suction equipment

The ability to deliver supplemental oxygen and maintain clear airways through suctioning represents two of the most critical competencies in patient care. Before these technologies were developed, clinicians had limited options when patients experienced respiratory distress, airway obstruction, or hypoxemia—conditions that frequently proved fatal. The evolution of oxygen therapy and suction equipment spans centuries of scientific inquiry, clinical experimentation, and engineering innovation. Understanding this history provides essential context for appreciating why specific safety protocols exist today and how modern devices function to protect vulnerable patients.

Today, every healthcare facility—from tertiary hospitals to ambulatory clinics—relies on standardized oxygen and suction equipment. As a Patient Care Technician/Assistant, you serve as the frontline professional responsible for ensuring this equipment is assembled correctly, functioning safely, and ready for immediate use. The central question this lesson addresses is: How do you correctly assemble, verify, and troubleshoot oxygen delivery and suction systems to ensure patient safety and effective respiratory support?

Before assembling any equipment, you must understand the foundational principles that govern how oxygen is delivered and how suction is applied. These principles guide every equipment decision—from selecting the appropriate delivery device to setting the correct flow rate or suction pressure. Mastery of these concepts ensures you can adapt to varied clinical scenarios, recognize malfunctions, and communicate effectively with supervising nurses and respiratory therapists.

The diagram above illustrates the sequential assembly of a standard oxygen delivery system. Assembly always proceeds from the source toward the patient: you begin at the oxygen cylinder or wall outlet (component ①), attach the pressure regulator (②) to reduce tank pressure from approximately 2,000 PSI to a working pressure of 50 PSI, then connect the flowmeter (③) that allows precise control of oxygen flow in liters per minute. When the prescribed flow rate exceeds 4 LPM—or when therapy will be prolonged—you add a bubble humidifier (④) filled with sterile water to moisten the dry gas before it travels through the connecting tubing (⑤) to the patient's delivery device (⑥). Each connection must be checked for audible leaks and secure fit before initiating flow. Note that wall outlet systems bypass the regulator because the piped system already delivers gas at the standard 50 PSI working pressure.

Oxygen Delivery Mechanism

Oxygen delivery systems operate on the principle of regulated gas flow from a high-pressure source to the patient at atmospheric pressure. A compressed oxygen cylinder stores gas at approximately 2,000 PSI (pounds per square inch). The pressure regulator reduces this to a safe working pressure of approximately 50 PSI, and the flowmeter further controls the precise volume of gas delivered per minute. The Thorpe tube flowmeter—the most common type—uses a floating ball in a calibrated glass tube; as you open the control valve, the ball rises proportionally to the gas flow rate. You read the flow rate at the center of the ball, ensuring accuracy.

Suction Mechanism

Suction equipment operates by generating negative pressure (vacuum) that draws fluids and secretions from the patient's airway or body cavity into a collection canister. Wall-mounted suction systems use a central vacuum pump with piped connections throughout the facility. Portable suction units employ battery-operated or electric pumps. Regardless of the source, the suction circuit consists of a vacuum source, a regulator to set negative pressure, connecting tubing, a collection canister with a lid and float valve (which prevents overflow into the pump), and a suction catheter or Yankauer tip that contacts the patient.

Oxygen delivery devices are classified as either low-flow or high-flow systems, a distinction that determines the consistency of FiO₂ delivery and guides device selection based on the patient's clinical needs. Low-flow devices supply oxygen at a rate below the patient's total inspiratory demand, meaning the patient entrains ambient room air to supplement the flow, resulting in a variable FiO₂ that fluctuates with breathing pattern and tidal volume. High-flow devices supply gas at or above the patient's peak inspiratory flow rate, delivering a fixed, predictable FiO₂ regardless of the patient's ventilatory pattern.

When selecting and setting up a delivery device, always confirm the physician's order specifying the device type, flow rate, and any special instructions such as continuous versus intermittent delivery. Verify that the device size is appropriate for the patient—pediatric masks on adults and adult masks on children both compromise FiO₂ delivery and patient comfort. Inspect the device packaging for sterility and integrity before opening. Once the device is connected to the oxygen tubing and flow is initiated, confirm that oxygen is flowing by feeling for gas output at the prongs or mask ports, and observe the humidifier for active bubbling if attached.

The following scenario walks through a complete setup sequence that a PCT would perform in a clinical setting. Pay attention to the verification steps at each stage—these are the actions that prevent adverse events.

No single oxygen delivery device or suction system is appropriate for all clinical scenarios. Understanding the strengths and limitations of each option allows the PCT to anticipate equipment needs, communicate effectively with respiratory therapists, and respond to changing patient conditions. The table below provides a comparative analysis of the most commonly encountered equipment configurations.

Suction Equipment Comparisons

The oxygen delivery and suction skills you are learning form the foundation upon which more advanced respiratory care interventions are built. As you progress in your healthcare career, you may encounter situations where basic equipment transitions to complex systems managed by respiratory therapists and critical care nurses. Understanding where PCT-level competencies end and advanced practice begins ensures safe scope-of-practice compliance and effective interdisciplinary collaboration.

The principle of scope of practice is critical here. While a PCT assembles and connects basic oxygen equipment and performs oropharyngeal suctioning with a Yankauer tip, procedures such as endotracheal suctioning, ventilator management, and arterial blood gas collection fall outside the CPCT/A scope and require the expertise of respiratory therapists, registered nurses, or physicians. When you encounter a situation that exceeds your training—such as a patient requiring high-flow nasal cannula or exhibiting signs of impending respiratory failure—your role is to immediately notify the supervising nurse or rapid response team while maintaining the current level of support and monitoring the patient's status.