---
title: "Patient Positioning Couch"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:PATIENT_POSITIONING_COUCH"
  data_integrity_hash: "7d8f5b10d6789f29e9cd55c678b16a38"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:PATIENT_POSITIONING_COUCH"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/patient-positioning-couch.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/patient-positioning-couch"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.1-2.0 mm positioning accuracy, 0-500 kg load capacity, -10°C to +40°C ambient temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 2.0
    unit: "mm"
    consequence: "Ball screw backlash exceeding 0.05 mm due to wear, linear bearing fatigue from cyclic loading at 10⁶ cycles, thermal expansion mismatch between aluminum carriage (α=23×10⁻⁶/°C) and steel rails (α=12×10⁻⁶/°C)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Encoder signal loss due to EMI exceeding 10 V/m at 100 MHz"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Shielded encoder cables with 40 dB attenuation, optical encoder isolation, differential signal transmission"
  - node_2:
      trigger: "Ball screw lubrication degradation below 0.1 μm film thickness"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Forced lubrication system with 0.5 L/min flow rate, PTFE-coated ball screws, real-time torque monitoring with 0.1 Nm resolution"
bom_nodes:
  couch-top:
    type: "part"
    urn: "URN:CNFX:ME:COUCH_TOP"
    interface_type: "physical-logic-coupled"
  base-frame:
    type: "component"
    urn: "URN:CNFX:ME:BASE_FRAME"
    interface_type: "physical-logic-coupled"
  vertical-column:
    type: "component"
    urn: "URN:CNFX:ME:VERTICAL_COLUMN"
    interface_type: "physical-logic-coupled"
  longitudinal-drive-system:
    type: "part"
    urn: "URN:CNFX:ME:LONGITUDINAL_DRIVE_SYSTEM"
    interface_type: "physical-logic-coupled"
  control-panel:
    type: "device"
    urn: "URN:CNFX:ME:CONTROL_PANEL"
    interface_type: "physical-logic-coupled"
  position-encoders:
    type: "part"
    urn: "URN:CNFX:ME:POSITION_ENCODERS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 13485:2016 - MEDICAL DEVICES - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "IEC 60601-1:2005+AMD1:2012+AMD2:2020 - MEDICAL ELECTRICAL EQUIPMENT - PART 1: GENERAL REQUIREMENTS FOR BASIC SAFETY AND ESSENTIAL PERFORMANCE"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/patient-positioning-couch.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b635a37e396dc7af9f702971020b1a067e42f85a3592dd7e96a421ec551fbb41"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Patient Positioning Couch

## 1. Technical Definition
A precision mechanical platform used to position and immobilize patients during radiotherapy treatment planning and delivery.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.1-2.0 mm positioning accuracy, 0-500 kg load capacity, -10°C to +40°C ambient temperature**. Failure boundary: **Positioning error exceeding 2.0 mm RMS, structural deflection &gt;5.0 mm under 500 kg load, motor temperature &gt;80°C**, Mechanism: **Ball screw backlash exceeding 0.05 mm due to wear, linear bearing fatigue from cyclic loading at 10⁶ cycles, thermal expansion mismatch between aluminum carriage (α=23×10⁻⁶/°C) and steel rails (α=12×10⁻⁶/°C)**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Encoder signal loss due to EMI exceeding 10 V/m at 100 MHz | 8 | Position feedback failure causing uncontrolled couch movement | Shielded encoder cables with 40 dB attenuation, optical encoder isolation, differential signal transmission |
| Ball screw lubrication degradation below 0.1 μm film thickness | 8 | Increased friction torque &gt;15 Nm causing motor overload | Forced lubrication system with 0.5 L/min flow rate, PTFE-coated ball screws, real-time torque monitoring with 0.1 Nm resolution |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Couch Top](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/couch-top.md) `(Standalone System)`
- [Longitudinal Drive System](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/longitudinal-drive-system.md) `(Standalone System)`
- [Control Panel](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/control-panel.md) `(Standalone System)`
- [Position Encoders](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/position-encoders.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Radiotherapy Linear Accelerator**, **CT Simulator**, **Patient Monitoring System**  
**Downstream Applications**: Radiotherapy Treatment Plans, Patient Positioning Protocols, Immobilization Devices  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are used in the construction of this patient positioning couch?
**A**: The couch is constructed using high-grade carbon fiber composite for the couch top, aluminum alloy for the frame and vertical column, and stainless steel for critical components, ensuring durability, precision, and compatibility with medical imaging.

### Q: How does this positioning couch ensure accuracy during radiotherapy treatment?
**A**: It features a precision longitudinal drive system and position encoders that provide sub-millimeter accuracy in patient positioning, combined with a rigid carbon fiber top that minimizes deflection, ensuring consistent and reproducible patient setup for treatment planning and delivery.

### Q: What are the main components included in the Bill of Materials (BOM)?
**A**: The BOM includes the Base Frame, Control Panel, Couch Top, Longitudinal Drive System, Position Encoders, and Vertical Column, all engineered to work together for reliable, motorized patient positioning and immobilization in radiotherapy applications.

## 6. Manufacturing Compliance
- ISO 13485:2016 - MEDICAL DEVICES - QUALITY MANAGEMENT SYSTEMS
- IEC 60601-1:2005+AMD1:2012+AMD2:2020 - MEDICAL ELECTRICAL EQUIPMENT - PART 1: GENERAL REQUIREMENTS FOR BASIC SAFETY AND ESSENTIAL PERFORMANCE

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Patient Positioning Couch](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/patient-positioning-couch)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **6** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: PATIENT_POSITIONING_COUCH | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 89ab8c28
