Buy a new vet-specific machine (Midmark VMS, Dispomed Moduflex, or Vetland Landmark) with an isoflurane vaporizer for $5,000-7,000 for a typical GP caseload; pick Plus/Elite-tier ($7,000-12,000) for premium workflow. Use a non-rebreathing circuit under 3-5 kg and a circle system at 3-5 kg and above. Require an O2-failure device, pop-off valve, manometer, O2 flush, and scavenging interface. Veterinary machines are exempt from FDA device regulation (no 510(k)/MAUDE/recall database), so vet due diligence relies on manufacturer reputation, warranty, and service; refurbished human machines (Draeger/GE) are FDA-tracked (788 510(k)s, 637 recalls) but carry higher training and parts risk. Annual service and 3-year vaporizer recalibration are required; payback is about 2.5 months at 20 cases/month.

Selecting a new veterinary anesthesia machine is one of the most critical capital purchasing decisions a practice owner or medical director makes. It is a purchase that directly impacts patient safety, staff health, daily clinic workflow, and the practice's bottom line.

General practice (GP) clinics face a crowded market of options: new veterinary-specific machines (such as Midmark, Dispomed, and Vetland) ranging from $5,000 to $12,000; or refurbished human-grade anesthesia workstations (such as Draeger and GE-Ohmeda) ranging from $8,500 to $19,500. Add in choices between vaporizers (isoflurane vs. sevoflurane), breathing circuits (circle vs. non-rebreathing), and safety scavenging setups, and the decision can quickly become overwhelming.

Unlike human medical equipment, veterinary devices occupy a unique regulatory space in the United States. They are exempt from premarket clearance, which shifts the burden of quality control and safety verification directly to the veterinary buyer.

To help clinics navigate this purchase, this guide provides a vendor-neutral analysis of the technical specifications, safety standards, regulatory realities, and financial return on investment (ROI) associated with veterinary anesthesia systems. Once a machine is chosen, our companion anesthesia machine leak-check and scavenging SOP covers the daily operation and safety checks this buyer guide assumes.

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How a veterinary anesthesia machine works and the three pressure circuits

To make an informed purchase, one must understand how an anesthesia machine manages gas pressures. An anesthesia system is essentially a pressure-reducing delivery network that takes high-pressure gas (oxygen) and delivers it at a safe, low pressure to the patient, mixed with a precise concentration of liquid anesthetic vapor.

The machine is divided into three distinct pressure circuits:

1. The High-Pressure System: Receives oxygen from high-pressure cylinders (usually E-cylinders mounted on the back of the machine, holding gas at approximately 2,200 pounds per square inch [psi]).
2. The Intermediate-Pressure System: Receives gas from the pipeline supply (from an oxygen concentrator or bulk tank at 50 psi) or from the regulator attached to the E-cylinder (which reduces pressure to 40–50 psi). This circuit feeds the flowmeter, the oxygen flush valve, and any oxygen-failure warning devices.
3. The Low-Pressure System: Extends from the flowmeter to the patient. It operates at close to atmospheric pressure (less than 15 psi). Here, the oxygen flows through the vaporizer, picks up the anesthetic gas, and enters the breathing circuit.

Key Components to Evaluate:

• The Flowmeter: Controls the rate at which oxygen is delivered to the system, measured in liters per minute (L/min). The flowmeter tube uses a small ball or float. Look for dual-scale or fine-touch flowmeters that allow precise adjustments at very low flow rates (under 1 L/min), which is critical for feline and pediatric canine patients.
• The Oxygen Flush Valve: Delivers a high flow of pure oxygen (40–70 L/min) directly to the common gas outlet, bypassing the vaporizer. This is used to rapidly clear anesthetic gas from the breathing circuit or to inflate a reservoir bag during an emergency.
• The Common Gas Outlet: The port where the fresh gas mixture (oxygen and anesthetic vapor) exits the machine and enters the patient's breathing circuit.

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Circle vs. non-rebreathing: matching the circuit to your patient mix

The breathing circuit is the pathway that delivers gas to the patient and removes exhaled carbon dioxide. The choice of breathing circuit is determined by the patient's body weight (per the AAHA 2020 Anesthesia and Monitoring Guidelines):

Patient weight	Recommended circuit
Under 3–5 kg (6.6–11 lb)	Non-rebreathing (e.g., Bain, Jackson-Rees)
3–5 kg and above	Rebreathing / circle system

The Circle (Rebreathing) System

In a circle system, the patient’s exhaled gases are recirculated back to them after passing through a chemical carbon dioxide absorbent (soda lime or baralyme).

• Patient Fit: 3–5 kg and above.
• Flow Rates: Typically semi-closed (10–40 mL/kg/min) or closed (4–7 mL/kg/min).
• Advantages: Warmth and moisture are retained in the circuit; low fresh gas flow rates conserve oxygen and liquid anesthetic, lowering operating costs.
• Disadvantages: High resistance to breathing due to one-way valves and the resistance of the CO2 absorber canister. Small patients (under 3 kg) do not have the lung capacity to overcome this resistance, leading to hypoventilation and carbon dioxide retention.

The Non-Rebreathing System

A non-rebreathing circuit (such as a Bain system or Modified Mapleson D) does not use a CO2 absorber. Instead, high fresh gas flow rates are used to wash out exhaled carbon dioxide before the patient inhales again.

• Patient Fit: Under 3–5 kg.
• Flow Rates: Very high (150–500 mL/kg/min).
• Advantages: Low resistance to breathing; fast changes in anesthetic depth (because fresh gas reaches the patient instantly without diluting in a large reservoir canister).
• Disadvantages: High gas and anesthetic consumption; patients lose body heat and moisture rapidly due to the constant dry, cold fresh gas flow.

The Barotrauma Risk

The oxygen flush valve delivers gas at 40–70 L/min. Never use the oxygen flush valve when a non-rebreathing circuit is connected to a small patient.

Because non-rebreathing tubes have very low volume, the sudden blast of high-pressure oxygen will bypass the pressure relief mechanisms and enter the patient's lungs directly, causing immediate, fatal barotrauma (ruptured alveoli and pneumothorax).

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Vaporizer choice: isoflurane vs. sevoflurane, agent-specific design, and servicing

The vaporizer is the heart of the low-pressure system, converting liquid anesthetic into a controlled vapor. Modern vaporizers are agent-specific and variable-bypass.

• Agent-Specific: Each vaporizer is calibrated for one specific chemical agent (isoflurane or sevoflurane) because their physical properties (vapor pressure, boiling point, and minimum alveolar concentration [MAC]) are completely different. You cannot put sevoflurane into an isoflurane vaporizer, or vice versa.
• Variable-Bypass: Only a fraction of the oxygen entering the vaporizer passes through the vaporizing chamber; the rest bypasses it. The dial controls the ratio, ensuring a precise percentage output regardless of fluctuations in room temperature or gas flow rates.

Isoflurane vs. Sevoflurane: The Economics and Clinical Tradeoffs

When purchasing, you must select which vaporizer agent to use. A GP clinic can run both, but most standard veterinary setups utilize isoflurane as their primary agent.

• Isoflurane (MAC 1.3% in dogs, 1.6% in cats): Highly stable, has a track record of decades, and is very inexpensive. Isoflurane liquid costs approximately $0.10/mL, translating to an average anesthetic cost of under $2.00 per hour of surgery.
• Sevoflurane (MAC 2.3% in dogs, 2.6% in cats): Has a lower blood-gas solubility coefficient, meaning the gas dissolves less in the blood. This allows for faster induction and, crucially, a much faster, smoother recovery. However, sevoflurane is less potent (requiring higher dial settings) and is significantly more expensive. Sevoflurane liquid costs roughly $0.80/mL, making it roughly 10x more expensive per anesthetic hour than isoflurane at equivalent settings.

Vaporizer Servicing and Calibration

A vaporizer dial is only accurate if the internal wicks and chambers are clean and calibrated. The veterinary guidelines from UC Davis IACUC-30 and Dispomed recommend:

• Annual Output Verification: A veterinary technician or field service agent should perform an on-site check of the vaporizer's concentration output using a gas analyzer.
• Recalibration (Every 3 Years): The vaporizer must be removed from the machine and shipped to a specialized service center. The unit is completely disassembled, cleaned of thymol residues (which accumulate from anesthetics), worn parts are replaced, and the unit is re-calibrated in a temperature-controlled environment.

On-site service is only output verification; a true calibration cannot be performed in a veterinary clinic.

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Non-negotiable safety features for a GP clinic

Every anesthesia machine must meet basic safety standards to prevent devastating errors. When evaluating a machine, ensure the following features are present:

1. The Oxygen-Failure Warning Device: If the oxygen pressure drops below 30 psi, the machine must emit an audible alarm. Some human-grade systems also cut off the flow of nitrous oxide to prevent delivering a hypoxic gas mixture to the patient.
2. The Adjustable Pressure-Limiting (APL) Valve / Pop-Off Valve: This valve controls the escape of waste gases from the breathing circuit. It must remain fully open during normal operation. If the pop-off valve is closed while a patient is connected, pressure will build rapidly in the lungs, causing barotrauma and cardiac arrest. Look for machines with a "safety pop-off valve" (a push-button override that temporarily closes the circuit to deliver a breath but pops open as soon as the button is released).
3. The Pressure Manometer: Measures the pressure inside the breathing circuit in centimeters of water (cm H2O). This is critical for monitoring during positive pressure ventilation (giving a breath). Safety guidelines dictate checking the circuit's pressure before each patient at 20–30 cm H2O to ensure no leaks exist.
4. Oxygen/Air Flowmeter Interlock: Prevents delivering an anesthetic mixture without oxygen flow.
5. Pin-Index Safety System (PISS) and Diameter-Index Safety System (DISS): Mechanical keyways that prevent connecting the wrong gas line (such as nitrogen or nitrous oxide) to the oxygen inlet.

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Scavenging and waste-anesthetic-gas compliance (NIOSH, OSHA, ACGIH limits)

Anesthesia safety is not just about the patient; it is also about the safety of the veterinary team. Chronic exposure to waste anesthetic gases (WAGs) is linked to neurological symptoms, reproductive risks, and hepatic damage.

There are two primary methods of removing WAGs from the pop-off valve:

• Active Scavenging: Uses a vacuum pump or fan system to pull waste gases out of the building. Active interfaces utilize a reservoir bag to prevent the vacuum from pulling gas out of the patient's lungs directly. Active systems are highly efficient, reducing ambient WAG levels by up to 90% (ACVAA).
• Passive Scavenging: Relies on the patient's expiratory effort to push waste gas through a tube out a wall port, or into an activated charcoal canister (such as an F/Air canister).

Note that activated charcoal canisters do not absorb nitrous oxide, and they must be weighed daily and discarded once they gain 50 grams of weight, as they saturate and stop absorbing gas.

Exposure Limits and Regulations:

• NIOSH (National Institute for Occupational Safety and Health): Historically recommended a Recommended Exposure Limit (REL) of 2 parts per million (ppm) for halogenated agents. In November 2022, NIOSH formally withdrew the 2 ppm REL, citing a lack of recent toxicological data to support that specific threshold, though they continue to advocate for minimizing occupational exposure through engineering controls.
• Cal/OSHA (California): Continues to enforce a Permissible Exposure Limit (PEL) of 2 ppm for isoflurane as an 8-hour Time-Weighted Average (TWA). This is the strictest regional standard in the US.
• ACGIH (American Conference of Governmental Industrial Hygienists): Adopted a Threshold Limit Value (TLV) of 50 ppm (8-hour TWA) for isoflurane in 2022, reflecting a higher exposure threshold before clinical signs of toxicity are observed.

Regardless of regional standards, the American College of Veterinary Anesthesia and Analgesia (ACVAA) recommends active scavenging wherever feasible. A NIOSH evaluation of a veterinary hospital (HHE 2022-0032-3399) demonstrated that clinics relying on passive charcoal canisters frequently exceed exposure limits during dental and surgical procedures due to saturated canisters or leaks around the patient's endotracheal tube.

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Vendor landscape: Midmark, Dispomed, Vetland, Hallowell, SurgiVet, A.M. Bickford

The veterinary anesthesia market is dominated by several key manufacturers. When comparing vendors, focus on build quality, support infrastructure, and warranty terms:

1. Midmark Animal Health (VMS and VMC Series)

• Profile: The market leader in North America. Known for robust construction and clean clinic aesthetics.
• Key Models: VMS (standard tabletop/wall/stand), VMS Plus (includes a dual-cylinder mounting block and shelf space).
• Warranty: 5-year warranty on the machine structure. Midmark has an extensive distributor and service technician network across the US.

2. Dispomed (Moduflex Series)

• Profile: A highly respected Canadian manufacturer known for engineering precision.
• Key Models: Moduflex Access (entry), Moduflex Optimax (mid-range with a 5-year warranty), Moduflex Elite (premium model with integrated bain circuit and luxury components).
• Warranty: Up to 5 years on the Optimax and Elite models. Known for excellent customer service and technical support.

3. Vetland Medical (Landmark Series)

• Profile: An American manufacturer that builds medical-grade systems with a focus on safety. Vetland is voluntarily ISO 13485:2016 certified (the medical device quality standard), a rare distinction for veterinary manufacturers.
• Key Models: Landmark V-20 (standard), Landmark EX3000 (premium).
• Warranty: Offers a lifetime parts warranty for the original owner, which is the strongest warranty in the industry.

4. Hallowell EMC

• Profile: Specialized in veterinary anesthesia ventilators (such as the Model 2000) and small-animal anesthesia delivery systems. Excellent choice for clinics performing high volumes of research or exotic surgeries requiring mechanical ventilation.

5. SurgiVet (Smiths Medical)

• Profile: Historically a massive brand in veterinary anesthesia. Many older clinics run SurgiVet machines. Smiths Medical has reduced its focus on the veterinary space in recent years, making parts and service harder to source than for Midmark or Dispomed.

6. A.M. Bickford

• Profile: One of the oldest names in veterinary anesthesia. They build simple, highly durable, mechanical machines. Excellent option for basic clinic setups or auxiliary prep areas.

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Are veterinary anesthesia machines FDA-regulated? The 510(k)/recall data and what it means

One of the most important legal and safety distinctions for veterinary buyers is the regulatory status of their equipment.

The Veterinary Device Exemption

Under the Federal Food, Drug, and Cosmetic Act, the FDA Center for Veterinary Medicine (CVM) regulates animal medical devices. However, the regulatory framework is completely different from human medicine.

The FDA's guidance document, "How FDA Regulates Animal Devices," states that veterinary medical devices are exempt from premarket notification (510(k) clearance), premarket approval (PMA), establishment registration, device listing, and post-market reporting of adverse events.

This means that veterinary-specific manufacturers (such as Midmark, Vetland, Hallowell, Dispomed, SurgiVet, JorVet, and A.M. Bickford) have zero 510(k) clearances in the FDA database. They do not submit their designs for FDA review, and their manufacturing facilities are not subject to routine FDA medical device inspections. (Our veterinary medical device regulation hub covers the full exemption landscape; this guide applies it to the anesthesia-machine purchase.)

Refurbished Human-Grade Machines: The FDA Record

In contrast, human-grade anesthesia machines (such as Draeger and GE-Ohmeda) are fully regulated Class II medical devices. The FDA Center for Devices and Radiological Health (CDRH) maintains complete records on these devices.

To characterize the safety and recall profile of human-grade anesthesia equipment, VetMedGuide analyzed the FDA 510(k) and medical device recall databases. The data reveal:

• 510(k) Clearances: There are 788 clearances for anesthesia workstation and vaporizer product codes (BSZ, CAZ, CAD, CAI, BSP, BSJ) in the FDA database, spanning from 1976 through mid-2026, and the large majority are Class II. The top cleared firms are Draeger Medical (41), Datex-Ohmeda (26), and Ohmeda Medical (20).
• Device Recalls: The FDA database contains 637 recalls (represented by 587 enforcement reports) for these same anesthesia product codes. The severity classification of these recalls is:
  • Class I (High Risk - Serious Injury or Death): 136 recalls
  • Class II (Moderate Risk - Temporary/Reversible Health Issues): 445 recalls
  • Class III (Low Risk - Unlikely to Cause Adverse Health Consequences): 6 recalls
• Top Recalling Firms: The firms with the highest number of recalls in the database are King Systems (143), Smiths Medical (84), Arrow International (72), Draeger Medical (37), and GE Healthcare (32).

A Practical Example of a Human Device Recall

As an example of why this data matters for due diligence, in May 2026 the FDA issued an Early Alert covering the Draeger Atlan A350 and A350 XL anesthesia workstations and later classified the action as a Class I recall (June 2026). The problem was a manufacturing defect — impurities introduced during production of the piston-ventilator motor assembly — that could cause the ventilator to indicate a failure before use (so mechanical ventilation could not be started) or to fail during a procedure. Manual and spontaneous ventilation remained available, but the risk included hypoxia, bradycardia, cardiac arrest, and death. Draeger's remedy is a hardware ventilator-motor-assembly replacement, not a software update. If a veterinary clinic purchased a refurbished Draeger Atlan, they would need to confirm the refurbishing vendor had completed that motor-assembly replacement — recall detail that simply does not exist for veterinary-specific machines because they do not report to the FDA database.

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New vs. refurbished: total cost of ownership, training burden, and payback

When a clinic owner is ready to buy, the choice often boils down to a new vet-specific machine vs. a refurbished human-grade workstation.

Refurbished Human Workstations: The Pros and Cons

A refurbished human anesthesia machine (such as a Draeger Fabius GS or GE Aestiva) is a highly sophisticated piece of medical technology.

• The Pros: Excellent build quality, integrated mechanical ventilators, advanced flow compensation, and built-in physiological monitoring capabilities. They feel premium and look impressive.
• The Cons:
  • Training Burden: These machines are designed for physician anesthesiologists. They utilize complex menu screens, software startup checks, and alarms. The training burden for veterinary technicians is high; a technician who is comfortable with a simple mechanical vet machine can easily be overwhelmed by a human workstation's software overrides.
  • Parts and Service Risk: Sourcing parts (such as proprietary breathing bags, custom hoses, or software circuit boards) for a discontinued human machine can be difficult and expensive. Furthermore, human medical service companies will not service machines used in veterinary clinics, forcing the clinic to rely on third-party veterinary service companies that may not have factory training on human workstations.
  • Circuit Adapters: Human machines must be adapted to fit veterinary circuits, particularly non-rebreathing circuits for patients under 3 kg.

Financial TCO and Payback Analysis

Let's look at the financial models for a typical general-practice clinic performing an average of 20 anesthetic procedures per month (approximately 5 surgeries per week). We compare an entry-to-mid-range new vet machine (with vaporizer) against a refurbished human workstation:

Cost category	New vet	Refurbished human
Capital cost (purchase)	$6,000	$14,000
Annual consumables	$2,400	$2,400
Annual service & calibration	$400	$800
Total 5-year TCO	$19,000	$29,000

• Capital Cost: A new mid-range vet machine (e.g., Midmark VMS or Moduflex Optimax) with an isoflurane vaporizer costs approximately $6,000. A quality refurbished human workstation costs roughly $14,000.
• Consumables: Oxygen, anesthetic liquid, soda lime, hoses, and endotracheal tubes run about $10.00 per procedure, totaling $2,400 per year ($12,000 over 5 years) for both systems.
• Service and Calibration: A vet machine requires annual service plus off-site vaporizer calibration every 3 years, averaging $400 per year. A complex human workstation requires professional on-site calibration and software verification, averaging $800 per year.
• Total 5-Year TCO: $19,000 for the new vet machine vs. $29,000 for the refurbished human workstation.

Payback Period Calculation

Assuming the clinic charges a conservative average of $160.00 for the anesthesia service line item (excluding surgeon fees and diagnostics), the net profit margin per procedure (after deducting $10 for consumables and $30 for technician labor) is $120.00.

• New Vet Machine Payback: Payback = capital cost ÷ monthly net revenue = $6,000 ÷ (20 procedures × $120) = 2.5 months (about 50 surgeries).
• Refurbished Human Workstation Payback: $14,000 ÷ (20 × $120) = 5.8 months (about 116 surgeries).

For a typical GP clinic, the simplicity, low training burden, 5-year warranty, and faster payback of a new vet-specific machine make it the more logical default purchase. The refurbished human workstation is best reserved for specialty surgery clinics, referral centers, or research institutions that can justify the higher capital outlay and training requirements to utilize integrated mechanical ventilation. The machine is one line item in a broader capital plan — pair it with our veterinary infusion and syringe pump buyer guide, anesthesia monitor buyer guide, and the veterinary clinic equipment budget checklist for the full anesthesia and monitoring stack.

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FAQs

How much does a veterinary anesthesia machine cost?

A basic tabletop or stand-mounted veterinary anesthesia machine without a vaporizer ranges from $2,300 to $2,600. Adding a new agent-specific isoflurane vaporizer (usually a TEC 3 design, costing $1,170–$1,175) brings the entry-level package to $3,450–$3,650. Mid-range systems (like the Midmark VMS or Dispomed Moduflex) cost $5,000–$7,000, while premium models (like the Dispomed Elite or Vetland EX3000) cost $7,000–$12,000. Refurbished human-grade workstations run from $8,500 to $19,500.

Are veterinary anesthesia machines regulated by the FDA?

Veterinary-specific anesthesia machines are exempt from FDA premarket clearance, registration, and listing requirements. Veterinary manufacturers do not file 510(k) clearances. However, human-grade machines (even when sold refurbished to veterinary clinics) are fully regulated Class II devices. VetMedGuide's analysis of the FDA database identified 788 clearances and 637 recalls for anesthesia-related codes, highlighting the need to verify that any refurbished human machine has had its open recalls resolved (for example, the 2026 Draeger Atlan Class I recall required a ventilator-motor-assembly replacement).

Should I buy a refurbished human anesthesia machine for my vet clinic?

While refurbished human workstations (like Draeger or GE-Ohmeda) offer advanced features like integrated ventilators and flow compensation, they are rarely the right choice for a typical general practice. They carry a much higher training burden for staff, have more complex diagnostic software checks, require more expensive maintenance, and present risks of discontinued parts. A new vet-specific machine is simpler, easier to maintain, and has a much faster payback period.

Which vaporizer do I need, isoflurane or sevoflurane, and how often does it need calibration?

General practices should choose isoflurane as their primary vaporizer agent because it is highly effective and extremely inexpensive (approx. $0.10/mL, under $2.00 per surgical hour). Sevoflurane offers faster inductions and recoveries but is roughly 10x more expensive (approx. $0.80/mL). Vaporizers are agent-specific and cannot be swapped. They require an annual output verification on-site and must be shipped off-site for full disassembly and recalibration every 3 years.

What safety features are non-negotiable on a veterinary anesthesia machine?

A safe veterinary anesthesia machine must include an adjustable pressure-limiting (APL) or pop-off valve (ideally with a push-button safety override to prevent accidental closure), a pressure manometer to monitor circuit pressure, an oxygen-failure warning device (audible alarm if O2 pressure drops below 30 psi), and an oxygen flush valve (to rapidly clear the circuit). Active scavenging is also non-negotiable to protect staff from waste anesthetic gases.

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Sources

• "How FDA Regulates Animal Devices," FDA Center for Veterinary Medicine: https://www.fda.gov/animal-veterinary/animal-health-literacy/how-fda-regulates-animal-devices
• Bednarski, R. et al. (2020). "2020 AAHA Anesthesia and Monitoring Guidelines for Dogs and Cats." Journal of the American Animal Hospital Association, 56(2), 2: https://www.aaha.org/resources/2020-aaha-anesthesia-and-monitoring-guidelines-for-dogs-and-cats/
• "Anesthetic Gases: Guidelines for Workplace Exposures," OSHA (US Department of Labor): https://www.osha.gov/waste-anesthetic-gases/workplace-exposures-guidelines
• "Evaluation of Waste Anesthetic Gas Exposure at a Veterinary Hospital," NIOSH/CDC Health Hazard Evaluation Report (HHE 2022-0032-3399): https://www.cdc.gov/niosh/hhe/reports/pdfs/2022-0032-3399.pdf
• "Control of Waste Anesthetic Gas Recommendations," American College of Veterinary Anesthesia and Analgesia (ACVAA): https://acvaa.org/wp-content/uploads/2019/05/Control-of-Waste-Anesthetic-Gas-Recommendations.pdf
• "Vaporizer Service Frequency & Calibration Guidelines," Dispomed: https://www.dispomed.com/anesthesia-vaporizer-service-recommndations
• "Anesthesia Machine and Vaporizer Service and Verification Guidelines (IACUC-30)," University of California, Davis: https://research.ucdavis.edu/wp-content/uploads/IACUC-30.pdf
• FDA 510(k) Premarket Notification Database & Medical Device Recalls Database, FDA CDRH: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfPMN/pmn.cfm
• Weil, A. (2018). "Overview of anesthetic machines and circuits (Proceedings)." dvm360: https://www.dvm360.com/view/overview-anesthetic-machines-and-circuits-proceedings
• "Veterinary Anesthesia Machine Purchase Guide," Vetamac: https://www.vetamac.com/veterinary-anesthesia-machine-purchase-guide-your-comprehensive-resource/
• "Veterinary Anesthesia Systems Product Catalog," Midmark Animal Health: https://www.midmark.com/animal-health/products/anesthesia
• "ISO 13485:2016 Certified Manufacturing Processes," Vetland Medical: https://vetlandmedical.com/