# How Should Hospitals Isolate Medical Devices Without Downtime in 2026?

hygiea.tech · September 24, 2026

> What Medical Device Network Isolation Actually Means Medical device network isolation is the controlled separation of clinical devices, clinical...

## What Medical Device Network Isolation Actually Means

Medical device network isolation is the controlled separation of clinical devices, clinical support systems, and ordinary corporate or internet-facing networks so that a compromise, faulty endpoint, or unauthorized connection does not spread without restriction. The goal is not to disconnect every device from the network. Connected infusion pumps, imaging systems, bedside monitors, laboratory instruments, and surgical platforms often need to exchange data with authorized clinical services. Isolation instead limits which systems may communicate, when they may communicate, and under which technical conditions.

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Two forms of isolation must be distinguished. Network isolation is a cybersecurity and operational boundary created with firewalls, access-control lists, secure gateways, virtual networks, jump hosts, data diodes, and monitoring. Electrical isolation refers to patient-applied parts and leakage currents, governed by standards such as IEC 60601-1. A firewall cannot make a device compliant with a medical electrical-safety standard, and a medical-grade isolated power circuit does not stop malware from moving across an Ethernet network.

As of 24 September 2026, the appropriate design is risk-based and selective rather than an all-or-nothing shutdown. Health-ISAC’s nine-domain MedTech cybersecurity baseline provides a useful procurement and deployment framework, while SecurityWeek and IT Security Guru reported that only 13% of operational-technology network segments were fully isolated. That figure should not be read as proof that every other hospital is insecure, but it does show that declared segmentation and effective isolation are not interchangeable. Hospitals should isolate high-risk and externally reachable systems first, document permitted traffic, and retain clinically necessary workflows.

## Why Connected Medical Devices Create a Distinct Isolation Problem

Medical devices combine long service lives with constrained replacement cycles, vendor-specific software, and safety consequences when availability declines. A hospital may operate bedside equipment built across several hardware generations, some of which cannot receive a conventional operating-system patch. Those systems frequently have shared authentication weaknesses, embedded browsers, legacy protocols, removable media, or service accounts intended for technicians rather than ordinary users. Segmentation reduces the number of reachable targets, but it cannot repair an unsupported device or determine whether its vendor can safely accept an update.

The patient-safety distinction changes the cost of a cyber event. An ordinary business interruption may stop email or a reporting workflow, while a broad failure involving pumps, ventilators, imaging, or monitoring can delay diagnosis and treatment. This does not mean that attacker-controlled pumps are routine; the broader point is that recovery priorities differ. Clinical engineering, information security, infection prevention, biomedical engineering, and clinical operations must agree on which device functions must remain available during containment.

A second difficulty is that medical environments contain several overlapping trust zones. These include clinical devices, the clinical network, building systems, vendor maintenance access, the hospital enterprise network, remote-access infrastructure, and cloud services. A vendor laptop connected temporarily for imaging-system maintenance can bridge two zones unless that access is authenticated, recorded, restricted, and removed. Remote support should not be equated with unrestricted remote access, and shared clinical VLANs should not be treated as safe merely because they are virtual rather than physical.

Research reported by Industrial Cyber on Health-ISAC’s nine-domain baseline is especially relevant because it places medical-device security across procurement, architecture, operations, incident response, supplier relationships, and lifecycle management. Research at Yeshiva University on AI-assisted protection for connected medical devices may eventually improve anomaly detection, but an experimental model does not replace deterministic access controls. Hospitals should use monitoring to identify unusual behavior while preserving policy-based boundaries that can be tested during maintenance and downtime.

## A Practical Architecture for Clinical Network Separation

Start with a documented map of devices, owners, vendors, clinical locations, operating-system constraints, software support status, data flows, and required uptime. Inventory records should include the manufacturer, model, serial or asset identifier, network addresses, connected systems, and whether the device is currently supported. A device with an undocumented service pathway should be treated as having an unknown dependency, not as a low-risk endpoint. The inventory must be validated through observation because intended diagrams often omit technician workstations, temporary connections, and application-specific links.

Use a default-deny architecture between clinical zones and allow only traffic required for a named clinical or security function. For example, a bedside monitor may need to transmit observations to a clinical server, receive limited configuration information, and support authenticated vendor maintenance, but it should not reach unrelated file shares or general internet hosts. Enforcement may occur through a purpose-built medical-grade gateway, a conventional firewall, a virtual network service, or a one-way data diode where outbound communication alone is sufficient. Policy changes should be approved by both clinical engineering and cybersecurity personnel.

Segmentation should be more granular than a single “medical devices” VLAN. Large fleets may be separated by care area, device class, risk level, and management function, but excessive fragmentation can create operational complexity without better protection. A better structure commonly places monitoring, infusion delivery, imaging, laboratory equipment, and vendor-access systems in distinct policy groups with narrowly defined rules. High-risk or unsupported systems should receive the strongest controls, including brokered maintenance, outbound restrictions, passive traffic inspection, and removal from unnecessary multicast or discovery domains.

Remote vendor access should pass through a dedicated, logged access point rather than a direct route into the clinical network. Use named accounts or short-lived credentials where the device supports them, multifactor authentication where the access service supports it, recorded sessions, restricted time windows, and approval from an authorized hospital employee. Maintenance accounts should be unique by organization and not shared across an entire device fleet. If a legacy device cannot support modern authentication, the compensating control may be a supervised technician workstation, but that arrangement should have a defined expiration and an alternative upgrade plan.

## Comparison of Isolation and Alternative Controls

No single product category solves medical-device separation. The right choice depends on whether the requirement is cybersecurity, electrical safety, bidirectional clinical communication, or simple visibility. Some technologies enforce a policy, while others expose behavior without actively blocking traffic. Cost, device certification, workflow support, and ease of testing should be evaluated together.

| Feature | Medical-grade network gateway | Firewall or virtual segmentation | One-way data diode | Passive monitoring sensor |
| --- | --- | --- | --- | --- |
| Main purpose | Enforce selected bidirectional clinical traffic | Enforce rules between network zones | Permit one-direction data transfer | Observe traffic without blocking it |
| Bidirectional communication | Supported when explicitly allowed | Supported when rules permit it | Generally not supported | Not applicable |
| Device-suitability consideration | Check clinical workflow, latency, vendor support, and certification claims | Mature and flexible, but device behavior must be tested | Useful where receiving systems must not send into a protected zone | Lower deployment risk because it usually does not interrupt traffic |
| Main weakness | Can disrupt poorly modeled dependencies or unsupported functions | Misconfiguration can expose trusted zones or break clinical services | Does not fit interactive workflows | Cannot stop an attack by itself |
| Appropriate first use | High-risk fleets and controlled vendor access | Enterprise segmentation with medical-grade review | Export-only telemetry or monitoring feeds | Discovery, validation, and continuous oversight |

These options are complementary rather than mutually exclusive. A hospital may use passive sensors to discover flows, firewalls to enforce policy, and a diode to protect a telemetry archive. A medical-grade gateway is not automatically safer than a conventional firewall; the device must fit the clinical function, and claims about suitability for the intended use should be documented. Electrical isolation, “floating systems,” and ungrounded systems should be evaluated separately under the applicable medical-device and facilities requirements.

## Safety Standards, Network Controls, and Compliance Boundaries

Network isolation supports compliance, but it does not create compliance on its own. IEC 60601-1 addresses basic safety and essential performance for medical electrical equipment, including concepts related to leakage current and isolation applicable to the equipment. Applicable collateral standards and manufacturer instructions may impose additional requirements. An insulation monitoring device, sometimes called an IMD, monitors an unearthed or floating power system for insulation deterioration; it is not a cybersecurity firewall. Similarly, terms such as “floating system” and “ungrounded system” describe electrical arrangements, not a complete defense against network intrusion.

For software lifecycle and connected-device risk, IEC 62304 addresses software development processes for medical-device software, while IEC 81001-5-1 addresses health software and health IT system security. These standards should be mapped to the device’s actual role rather than attached to procurement documents as unexplained labels. The Health-ISAC nine-domain baseline is also not a substitute for a law or an accreditation requirement. It is a sector framework that can help hospitals structure procurement questions, supplier responsibilities, asset inventories, vulnerability handling, and incident exercises.

Regulatory timing also matters. In the United States, the Food and Drug Administration’s 2023 premarket cybersecurity guidance and the statutory expectations associated with section 524B affect the cybersecurity documentation required for covered device submissions. The EU Cyber Resilience Act entered into force on 10 December 2024, with vulnerability-reporting obligations scheduled to apply from 11 September 2026. Manufacturers and healthcare providers should confirm current legal requirements with qualified compliance counsel and the relevant regulator. Hospitals also need to balance these requirements with clinical availability, maintenance contracts, and patient-care obligations.

A control is only defensible if it has been tested. A rule that blocks required telemetry is not a successful segmentation policy if clinicians then revert to an unapproved workaround. Likewise, a permitted path to a vendor support server may create unacceptable exposure. Validation should include authorized clinical workflows, alarm delivery, time synchronization, identity services, vendor maintenance, backup, and recovery. The final test record should state which device models passed, which exceptions remain, who approved them, and when they will be reviewed.

## Common Mistakes That Produce False Isolation

The most common error is creating a VLAN and assuming that the label provides separation. A VLAN only helps if traffic is enforced between zones, inter-zone routing is controlled, and no undocumented bridge or host creates an alternate path. Hospitals should test actual reachability rather than relying on diagrams. A successful test may confirm that a device can reach only its approved server, but it should also examine whether the device can initiate outbound connections, resolve unintended addresses, reach management interfaces, or communicate directly with neighboring devices.

Another mistake is treating patching and segmentation as substitutes. Unsupported equipment may remain in service because replacement is expensive or because a vendor offers no fix. Isolation can reduce exposure while the replacement project proceeds, but it cannot remove a known defect from a device that is still clinically necessary. A durable plan should include compensating controls, vendor-supported operating systems, application allow-lists, usage restrictions, and a retirement date when risk exceeds clinical benefit.

Organizations also make the mistake of blocking access without designing a safe support path. If clinicians believe that segmentation prevents necessary troubleshooting, they may use personal devices, unauthorized hotspots, or undocumented cables. This shifts the risk without solving it. Maintenance procedures should show staff how to obtain help, which temporary access is allowed, how data and sessions are recorded, and how access ends. Exceptions should have an owner, reason, expiry, and compensating control rather than existing as permanent ambiguity.

Finally, hospitals may apply adult IT policies to a much older device without checking its effect. Excessive timeouts, incompatible certificate requirements, or unsupported protocols can interrupt monitoring and therapy-related functions. The correct response is not to remove all controls, but to document the limitation and choose a boundary that the device can tolerate. That boundary should be verified clinically and technically before deployment, particularly for alarm, imaging, laboratory, and patient-monitoring systems.

## When Hospitals Should Act and How to Sequence the Work

Immediate action is warranted when a device is connected to the internet without a defined purpose, is exposed to a shared vendor network, has no accountable owner, or is reachable from an ordinary user workstation. Priority also rises when a manufacturer has disclosed an unresolved vulnerability, the device runs unsupported software, or maintenance access bypasses central logging. If a device cannot be patched, segmentation becomes a more important compensating control, but removal or replacement should be evaluated when the risk is too high to accept.

A sensible first 30 days focus on ownership, discovery, and the highest-risk external paths. Identify internet-exposed devices, remote-access services, vendor accounts, and undocumented connections. During days 31 to 90, design a small pilot around one device class or care area, validate the workflows, and measure attempted connections that policy should have blocked. Over the following three to six months, extend the pattern to other high-risk fleets and integrate security monitoring with clinical engineering records. Review the architecture at least annually and after major acquisitions, network migrations, device replacements, or changes in vendor support.

Segmentation should not wait for every device to be modernized. Waiting can leave critical paths exposed for years, while an early, carefully bounded pilot can reveal dependencies that diagrams missed. The hospital should define a risk acceptance process for cases where a device cannot be isolated safely, such as a clinical instrument whose communication requirement is still being validated. That acceptance should state the remaining exposure, monitoring measures, responsible person, review date, and conditions that trigger immediate escalation.

Incident exercises should test the response as well as the architecture. The exercise should determine who can shut down a bridge, revoke vendor credentials, preserve logs, isolate a device, communicate with the care team, and restore service without destroying evidence. These steps should be rehearsed before a patient-safety event or ransomware disruption makes improvisation necessary. The exercise also reveals whether the “isolated” zone still has hidden dependencies on identity, name resolution, time, software distribution, or remote support.

## Cost, Procurement, and Operational Trade-Offs

Medical-device isolation is a program rather than a single appliance purchase. Planning-level costs can range from several thousand dollars for a limited pilot involving a small number of devices to tens or hundreds of thousands of dollars for an enterprise program with network changes, clinical validation, monitoring, and vendor coordination. A medical-grade gateway or specialized network appliance may cost roughly $1,000 to $15,000 per unit depending on performance, interfaces, certification claims, and support, but those are budgetary ranges rather than vendor quotes. Hospitals should obtain current pricing, warranty terms, licensing costs, and total support expenses.

The largest costs may be engineering time and downtime management rather than hardware. Staff must inventory devices, map traffic, negotiate supplier access, test clinical functions, update policies, and monitor exceptions. A low purchase price can become expensive if the product cannot support required protocols, requires disruptive firmware changes, or produces false alarms that clinicians ignore. Conversely, a more capable device may be poor value if the hospital lacks staff to maintain it. Procurement should evaluate usability during actual maintenance, not only throughput and list price.

Vendors should be asked to document the intended use, supported operating systems, protocol handling, logging, account model, update process, vulnerability-reporting route, and service life. A claim that a product is suitable for healthcare should be examined for the specific device and workflow involved. Hospitals should also price the end of the project: spare parts, subscription renewals, integration, replacement of legacy switches, and eventual migration to newer equipment. A design that cannot be sustained for five years may be safer on paper but weaker in practice.

## How to Measure Whether Isolation Is Working

Measure technical enforcement, clinical continuity, and governance separately. Technical indicators include the percentage of inventoried devices with verified segmentation, the number of undocumented paths, blocked unauthorized flows, expired vendor accounts, and time to revoke access. A target of 100% asset ownership is reasonable, but the hospital should not claim 100% isolation merely because firewalls report rule counts. Test a sample of devices and services, including the oldest supported models and devices receiving vendor maintenance.

Operational indicators include the time required to contain a misconfigured connection, the percentage of remote sessions reviewed or recorded, the number of policies exceeding their approved exception period, and the frequency of clinical-workflow validation. Governance indicators include completed supplier security responsibilities, named owners, current software-support status, and documented risk acceptances. Review results quarterly, with immediate review after a major incident or vendor change.

The defensible outcome is not zero connectivity. It is controlled connectivity in which every necessary relationship has a purpose, owner, technical restriction, and review date. On that basis, a hospital can reduce exposure without pretending that segmentation solves every vulnerability, preserves clinical availability, and creates measurable evidence for safety, compliance, and vendor-management decisions.

## Quick answers

### Is medical device network isolation the same as electrical isolation?

No. Network isolation limits communication between devices and systems, while electrical isolation concerns leakage currents, patient-applied parts, and equipment safety. A network firewall cannot replace IEC 60601-1 testing or manufacturer-required electrical safeguards.

### Do all medical devices need their own VLAN?

No. Separate policies can be appropriate for device classes, care areas, or management functions, but excessive fragmentation can complicate operations. The design should match device risk, dependencies, maintenance needs, and clinical uptime rather than assigning a VLAN automatically to every device.

### What should a hospital do first for an unsupported medical device?

Inventory its connections, restrict unnecessary communication, remove direct internet exposure, and control vendor access through a dedicated monitored path. Use a documented risk acceptance or replacement plan because segmentation only reduces exposure and does not correct the unsupported software itself.

### Can a data diode replace a firewall in a hospital network?

A data diode is useful when one-direction transfer is sufficient, such as sending selected telemetry to an archive. It is generally unsuitable for interactive clinical workflows, so hospitals may need it alongside firewalls or gateways rather than as a complete replacement.

### How can hospitals prove that segmentation works?

They should validate actual reachability, test authorized clinical workflows, review blocked and permitted flows, and examine undocumented bridges or service accounts. Evidence should include device inventories, policy tests, exception records, clinical approval, and periodic review dates.

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