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Muscle Strip System - 840MD

4-Channel high throughput MyoDYNAMIC Muscle Strip System with the capacity to perform isometric, eccentric, and concentric muscle contraction studies under a range of conditions.
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​Can be fully controlled by PC software
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Perform eccentric & concentric contraction studies 
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​Integrated gassing, heating & vacuum
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​Ideal for high throughput
The MyoDynamics Muscle Strip System - 840MD represents a state-of-the-art 4-channel muscle strip system for intact muscle or muscle strips of up to 30 mm in length. The easy-to-use system allows the muscle physiologist to perform isometric, eccentric, and concentric contractions protocols performed by the build-in motors in a precise manner under a range of conditions, including electric field stimulation.
 
The system allows for four separate baths to run simultaneously and independently from each other. The system gives the flexibility to program each bath individually and initiate ad stop protocols independently from the other baths.
   ​     
Each muscle bath unit, made of aluminum, features a stainless steel chamber. The tissue mounting supports are positioned in the chamber, with one side attached to the force transducer and the other to a combination manual positioner screw and a motorized micropositioner. The manual positioner allows the accurate preload/base tension setting, while the motorized micropositioner permits the user to stretch (Eccentric)/relax (Concentric) the muscle according to user-defined settings. The sensitive force transducers provide measurements of contractile forces. Mounted tissue can be stretched and relaxed,  defined by the user with a minimum distance of 10µm up to 11mm and a maximum speed of 11mm/sec.

The 840MD comes with a controller software that enables autonomous experimentation. The software includes 30+ commands that allows parameters to be set for motor speed, pull range, force change and more. This also enables eccentric experimentation where the motors can start at the moment of muscle strip contraction.

​​Stimulation electrodes built into the chamber cover (optional - various types) can activate the muscle via field stimulation from the DMT Stimulator. The 840MD has input and output trigger functions to activate the build-in motors by the DMT stimulator or visa versa.
 
This system is well suited for studies involving muscle reactivity and fatigue experiment connected to neuromuscular disorders such as muscular dystrophy, metabolic, ataxia, and myofibrillar myopathies.

Multiple units can be arranged side-by-side to facilitate high-throughput screening, such as drug testing or experiments requiring the separation of muscle preparations in individual baths. 
​
Related Products:​​
  • ​​Data Acquisition - PowerLab
  • Computer Package (Desktop) 
  • Dissection Stereo Microscope
  • Light Source 
  • Dissection Tool Kit 
  • Heating Bath Circulator
  • Vacuum Package
  • Buffer Filler System - 625FS
  • Gas supply manifold
  • pH Electrode & pH Meter License 
  • Volume Reducing Insert
  • ​Service & Maintenance Agreement
  • Extended warranty +3 years​
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Muscle Strip Chamber

# Eccentric and concentric contractions
# Control and measurement of length and isometric force 
# Direct or field stimulation
# Up to 30mm muscle strip length
​# Acid resistens stainless steel chambers
# ​Ideal for muscle reactivity and fatigue testing

Interface Unit

​# Integrated heating, gassing, & drainage
# Selectable force range (mN)
# Intregreted calibration procedure
# ​Intuitive touch-screen interface menus
# Compact design / small foot
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Electrophysiological ​Studies -
​General Protocol Types;

​# Dystrophic/mechanome affected muscles 
# General physiological examination of diseased and healthy 
    muscles subjected to an intervention
# Metabolic affected muscles – Glycolysis /glycogen
​   decomposition
# Metabolic affected muscles – Fatty acid conversion 
# Ion channel defects – force affected
# Ion channel defects – indirect force affected
# Myofibrillary myopathies
Download Protocols
Provided by courtesy of
​Dr. Thomas Krag, Copenhagen Neuromuscular Center
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Specifications:
Chamber
Chamber suction
Chamber cover
Chamber gassing
Chamber size
Chamber material
Chamber temperature range
Force range
Force resolution
Max. segment length
Min. segment length
Max. micrometer reach
Max. micrometer step
Motor speed
Resolution
Speed tolerance
Min. resolution of motor
Distance tolerance
Motor control
Analogue outputs
Analogue output range
Output impedance
Digital input
Voltage range
Digital output
​
Air Connection
Transducer Data:
​
Max. Range
Operating temperature
Frequency range
Active cooling with water:
Amount of cooling water
Max. pressure
​Chamber temperature resolution
Chamber temperature stability
Physical Data:
Voltage 
Dimensions
Net Weight
​Ambient temperature

Four individual chambers
Manual or automatic
Supplied with connections for gassing
Individually controlled per chamber
Standard 8 ml, max. 15 ml
Stainless steel
Ambient - 40°C
± 200, 400, 800 or 1600 mN
0.1 mN
30 mm
2 mm
12 mm (manual)
11 mm (motor)
0.5 - 12 mm/sec.
0.1 mm/sec.
0.5%
10 µm
± 15 µm
User defined protocols
4 BNC connectors
± 2.5 V
<200 Ohm
Two ports per chamber on the back panel
Voltage range 5-24 VDC, Min. pulse length is 5 ms, Galvanically isolated  Two per chamber on the back panel, Voltage range max. 24 VDC, Max. current is 30 mA, Min. pulse length is 10 ms, Galvanically isolated
Max. 10 bar
​​
± 1600 mN
15 - 40°C
0 - 20 Hz

50 - 300 ml/min.
0.5 bar
0.1°C
​± 0.2°C

100-240 VAC to 24 VDC
49 x 30 x 17 cm (LxDxH)
9 kg
​15 - 30°C
TISSUE PULLER SYSTEM - 560TP USER MANUAL VOL. 3.1
Need-to-have:
  • Computer Package (Desktop) (#101022)
  • Dissection Stereo Microscope (#400484)
  • Light Source LED- gooseneck guide (#400794)
  • Dissection Tool Kit (#101017)
  • Open Heating Bath Circulator- Water bath 110V (#400738), 220V (#400740)
  • Vacuum Package - 110V (#101019), 220V (#101053)
​​
Nice-to-have:​
  • Mounting Supports 200 μm - pins with lock (#300562)
  • Mounting Supports 400 μm - pins with lock (#300545)
  • Mounting Supports 500 μm - pins with lock (#300563)
  • Mounting Supports 600 μm - pins with lock (#300564)
  • Mounting Supports 700 μm - pins with lock (#300565)
  • Mounting Supports 800 μm - pins with lock (#300566)
  • Mounting Supports 900 μm - pins with lock (#300567)
  • Mounting Supports 1000 μm - pins with lock (#300568)
  • Force Transducer- isometric (#300538)
  • Gas supply manifold- 4-channel (#300295)
  • Service & Maintenance Agreement (5yr) (#101054)
  • Extended warranty +3 years (#101034)
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Data Sheet

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Citations Google Scholar

WIRE MYOGRAPH SYSTEMS
​Single Wire Myograph System - 320A
Confocal Wire Myograph System - 360CW
​Dual Chamber Wire Myograph System - 420A
Multi Myograph System - 620M
Automated Multi Myograph System - 630MA
​​
​​ORGAN BATH SYSTEMS
Multi Myograph System - 620M​
Organ Bath System - 820MO
​
​MUSCLE STRIP SYSTEMS
Tissue Puller - 560TP
MyoDynamics Muscle Strip System - 840MD
​
​​​PRESSURE MYOGRAPH SYSTEMS
Pressure Myograph System - 110PXL
Pressure Myograph System - 112PP
Pressure Myograph System - 114P
Pressure Myograph System - 114PB
Pressure Myograph System - 114PN
SUPPORT
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© 2025 Danish Myo Technology A/S
  • Products
    • Muscle Strip Systems >
      • Tissue Puller System - 560TP
      • MyoDynamics Muscle Strip System - 840MD
    • Organ Bath System >
      • Organ Bath System - 820MO
    • Pressure Myograph Systems >
      • Pressure Myograph System - 110PXL
      • Pressure Pulsation Myograph System - 112PP
      • Pressure Myograph System - 114P
      • Pressure Myograph System - 114PB
      • Pressure Myograph System - 114PN
      • Pressure Myograph System - 120CP
    • Wire Myograph Systems >
      • Single Wire Myograph System - 320A
      • Confocal Wire Myograph System - 360CW
      • Dual Wire Myograph System - 420A
      • Multi Myograph System - 620M
      • Automated Multi Myograph System - 630MA
    • Myograph Software >
      • MyoNORM
      • MyoDAQ Acquisition
      • MyoVIEW 5
      • MyoPULSE
    • Accessories & Parts >
      • Buffer Filler System
      • Dissection & Mounting
      • FlowMeter - 162FM
      • Stimulators >
        • Stimulator - CS4+
        • Stimulator - CS8
      • Transducers
  • Support
    • Guides, Videos & More >
      • Product Videos
      • Guides & Manuals
      • Protocols/Articles
      • Software Downloads
      • How To Videos
    • Myograph Training/Installation
    • System Maintenance
  • Blog
  • About us
  • Contact