TENS 7000

Technical Specifications of TENS 7000

Mechanism               Technical Description
Channel                                       Dual, isolated between channels
Pulse Amplitude                 Adjustable, 0-100mA at 500ohm load each channel
Wave Form                                Asymmetrical Bi-Phasic Square Pulse
Voltage                                                0-50V (Load: 500ohm)
Power Source                                            One 9 Volt battery
Size                                               10.1cm(L)x6.1cm(W)x2.45cm(H)
Weight                                                        150 grams with battery
Pulse Rate                                   Adjustable, from 2 to 150 Hz, 1Hz/step
Pulse Width                    Adjustable, from 50 to 300microseconds, 10microseconds/step
Modes                        B(Burst), N(Normal), M(Modulation), SD1(Strength Duration), SD2
Burst Mode                                     Burst rate: Adjustable, 0.5-5Hz
                                                Pulse width adjustable, 50-300 microseconds
                                                              Frequency fixed = 100 Hz
Normal Mode            The pulse rate and pulse width are adjustable. It generates
                                           continuous stimulation based on the setting value
Modulation Mode            A combination of pulse rate and pulse width modulation.
                                      The pulse rate and width are automatically varied in a cycle pattern.
                                        The pulse width is decreased by 50% from its original setting in
               0.5 seconds, then the pulse rate is decreased by 50% from its original setting in 0.5 seconds.
                                    Total cycle time is 1 second. In this mode, pulse rate (2-150Hz) and
                                            pulse width (50-300 microseconds) are fully adjustable.
SD1 Mode                 The SD1 mode consists of automatic modulation intensity and pulse width in 40% range. The intensity is always increasing while the pulse with is decreasing and vice verse. The intensity decreased by 40% while the pulse width is increased by 40% in 5 seconds. In the next 5 seconds, the intensity is increased by 40% while the pulse width is decreased by 40%. Total cycle time is 10 seconds. Pulse rate (2-150Hz) and pulse width (50-300 microseconds) are fully adjustable.
SD2 Mode                    The SD2 mode consists of automatic modulation intensity and pulse width in
70% range. The intensity is always increasing while the pulse with is decreasing and vice verse. The intensity decreased by 70% while the pulse width is increased by 70% in 5 seconds. In the next 5 seconds, the intensity is increased by 70% while the pulse width is decreased by 70%. Total cycle time is 10 seconds. Pulse rate (2-150Hz) and pulse width (50-300 microseconds) are fully adjustable.
Timer                     Adjustable, from 1 to 60 minutes of continuous. Adjustable in 1 minute each step from 1 to 15 minutes and 5 minutes each from 15 to 60 minutes. Treatment time countdowns automatically.
Patient Compliance Meter          This unit can store 60 sets of operation records. Total recorded
                                                                                   time is 999 hours.
Low Battery indicator        A low battery indicator will show up on the LCD when the battery is low

Operating Conditions            Temperature: 0-40˚C | Relative Humidity: 30%-75% | 

                                                             Atmospheric pressure: 700Hpa-1060Hpa

Remark                     There may be a +/-5% tolerance of all parameters and +/-20% tolerance 

                                                                      of  amplitude and voltage

Safety

TENS unit should not be used on patients with the following conditions without consulting a physician first:

• implanted electronic device such as a pacemaker
•  heart disease, epilepsy, cancer 
• pregnant

Electrodes should never be placed in the following locations:

• throat or neck
• head

The device should not be used while:

• driving
• operating machinery
• near water
• sleeping

Improved Timeline

	Week
Task	1	2	3	4	5	6	7	8	9	10
Literature study	x	x	x	x
Mechanical design				x	x	x
System integration					x	x	x
Testing						x	x	x	x
Final report preparation								x	x	x

 For the first four weeks, research was conducted on TENS units and general post-injury/surgery knee braces. Having already acquired a DonJoy knee brace, that component did not need to be purchased and could be examined for what needed improvement. A TENS unit was purchased and can now be incorporated into the knee brace to start on the design for the final deliverable. Over the course of weeks 5-9, the design will be modified and tested until the most efficient model is produced. From the tests and further research, a final report will be prepared to present at the end of 10 weeks.

Acquisition of TENS unit update

Model:Smith & Nephew Exogen 4000+ Bone Healing System

Dimensions:7.5cm by 12.5cm by 3.75cm

Cord Length:42.5- 26.25cm

Weight:???

Functioning:???

Usability: Questionable

TENS unit FDA Information

Click Here

Brace

Side view of DonJoy Brace

 

 

Front View of DonJoy Brace

DonJoy Brace with Sleeve

Tens 7000 Unit

Explanation of TENS Unit

http://www.tensunits.com/

http://www.webmd.com/pain-management/tc/transcutaneous-electrical-nerve-stimulation-tens-topic-overview

Combo of Brace with TENS unit

Sleeve with Cutouts for Nodes

Sleeve and Brace

Design Matrix

Introduction/Purpose

Recovery from injuries and surgeries is generally a painful period, but unfortunately many people have to go through such a period in their lifetime. The goals of the project include improving the comfort of existing knee braces by adding a transcutaneous electrical nerve stimulation (TENS) unit to the brace and more breathable fabric in order to make the overall recovery period less painful. The main task includes incorporating electrical nodes on the knee and wiring the TENS unit to remain attached to the nodes and the overall knee brace while the patient wears the brace throughout the day. The TENS unit will be able to be activated by the patient when they are resting to help relieve pain during the day. While trying to accomplish this, the wiring and attachment of the unit will be the most difficult technical challenges. At the end, a functional, more comfortable brace with a TENS unit embedded in it will be made from an existing knee brace.