Point-of-Care Device Implementation Guide
1.0.0 - STU 1

Point-of-Care Device Implementation Guide, published by HL7 International / Devices. This guide is not an authorized publication; it is the continuous build for version 1.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/uv-pocd/ and changes regularly. See the Directory of published versions

## Extension: Device Instance extension

Official URL: http://hl7.org/fhir/uv/pocd/StructureDefinition/device-instance | Version: 1.0.0
Standards status: Trial-use | Maturity Level: 2 | Computable Name: DeviceInstance

StructureDefinition that adds an instance number or label to Device or DeviceMetric.

This extension is intended to distinguish device components (VMDs, Channels, Metrics) of the same type. For example, an ICU patient monitor may provide multiple invasive blood pressure or temperature measurements either built-in or as pluggable modules. The Device Instance extension associates measurement hardware with a Device or DeviceMetric resource instance by number (e.g., slot position) or connector label.

Context of Use

This extension may be used on the following element(s)

- Element ID: `Device`
- Element ID: `DeviceMetric`

Usage info

Usages:

- Use this Extension: Channel Device profile, Enumeration DeviceMetric profile, Numeric DeviceMetric profile, Sample Array DeviceMetric profile and VMD Device profile
- Examples for this Extension: Device/BloodPressureVmdDevice

You can also check for usages in the FHIR IG Statistics

### Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

- Differential Table
- Snapshot Table
- Statistics/References
- All

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Instance number or label
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:number |  | 0..1 | Extension | Instance number
url |  | 1..1 | uri | "number"
valueUnsignedInt |  | 1..1 | unsignedInt | Value of extension
extension:label |  | 0..1 | Extension | Instance label
url |  | 1..1 | uri | "label"
valueString |  | 1..1 | string | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/device-instance"
value[x] |  | 0..0 |  | Value of extension
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Instance number or label
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:number |  | 0..1 | Extension | Instance number
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "number"
Slices for value[x] |  | 1..1 | unsignedInt | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueUnsignedInt |  | 1..1 | unsignedInt | Value of extension
extension:label |  | 0..1 | Extension | Instance label
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "label"
Slices for value[x] |  | 1..1 | string | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueString |  | 1..1 | string | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/device-instance"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: StructureDefinition that adds an instance number or label to Device or DeviceMetric.

- number: unsignedInt: Instance number for multiple components of the same type.
- label: string: A human-readable label that describes the physical connector.

Maturity: 2

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Instance number or label
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:number |  | 0..1 | Extension | Instance number
url |  | 1..1 | uri | "number"
valueUnsignedInt |  | 1..1 | unsignedInt | Value of extension
extension:label |  | 0..1 | Extension | Instance label
url |  | 1..1 | uri | "label"
valueString |  | 1..1 | string | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/device-instance"
value[x] |  | 0..0 |  | Value of extension
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Instance number or label
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:number |  | 0..1 | Extension | Instance number
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "number"
Slices for value[x] |  | 1..1 | unsignedInt | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueUnsignedInt |  | 1..1 | unsignedInt | Value of extension
extension:label |  | 0..1 | Extension | Instance label
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "label"
Slices for value[x] |  | 1..1 | string | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueString |  | 1..1 | string | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/device-instance"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: StructureDefinition that adds an instance number or label to Device or DeviceMetric.

- number: unsignedInt: Instance number for multiple components of the same type.
- label: string: A human-readable label that describes the physical connector.

Maturity: 2

Other representations of profile: CSV, Excel, Schematron

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`