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Result oriented individual with over 25 years experience in equipment maintenance, from the design to completion, including proper use, safety and functionality; an innovative personality with tremendous knowledge and education in quality assurance, research and development. With services and managerial roles at technical level also leading and developing others, maintaining excellent interpersonal relationships at all levels, also enjoying the challenge of bringing about efficiency for the business through inspiring teams to meet their goals and personal objectives.

Soldering How to Guide

How to Solder Soldering how to guide focuses on soldering for beginners and how to solder different components using different methods. This information care for the experienced as much as newbies. At first soldering can seem discouraging, when you give it a try, you will find it easy and simple in most applications. Like everything…

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Anesthetic Machine Failure

Anesthetic Machine Uses

A continuous flow anesthetic machine is most commonly used in advanced  countries of the world. Although its used in many developing countries too.  Its purpose is to deliver accurate and continuous supply of oxygen, nitrous and any other medical gases. In the flow, the oxygen mixes with accurate concentrated anesthetic vapor such as halothane or isoflurane. Further, the mixture is delivering to the patient at a reduced and save pressure through gas regulators and flow meters. However, some anesthetic machine includes ventilator, suction, and patient monitors.

Anesthetic machine failure

Best Anesthetic Machine

It’s nice buying new machine which is affordable compared to used ones. Sometimes, refurbished are not proper and you are unsure of its status. Especially for life saving device like anesthetic machines. Anesthetic machines and ventilator just like other medical equipment are sensitive. Therefore, requires standards especially the vaporizer, rotameter also known as flow meter.

Components which causes anesthetic machine failure include the gas regulators/and gauges requires competent personnel to carry out proper standard tests and calibration. This at most obviously out of reach in most developing countries. You need equipment sources with warranty and maintenance plan. Be it new or refurbished equipment, the margin in price are usually very small. I always recommend new equipment to my clients. You can choose between branded and generic machine and each of them have merits and demerits. Do you need good quality anesthetic machine with ventilator and patent monitor backed with technical and users level training? Contact us for more information.

Anesthetic Machine Failure

Anesthetic machine failure include leakages which are the most common problem with all appliances using air and gas and anesthetic machines and Ventilator are no exceptions. These happen through the joints, and fittings; also through the gas pressure reducing valve (regulators) or the flow meters and this is usually as a result of aged O –rings, ruptured rubber, corrugated tubing and host of many others. However it is imperative to test and confirm there is no leakage of gas be it nitrous, oxygen, air and the anesthetic vapors.

Precautions Handling Anesthetic Equipment
  1. Ensure NO OIL or Grease to avoid fire or explosion
  2. Tight-to-tight! Do not over-tight screws, bolts and nuts to avoid breakage because tubing, piping, nuts and screws are essentially copper and or brass materials.
  3. Use threading tapes for tight fit
  4. Ensure Anesthetic and Operating Rooms floor contains  anti-static rubber materials. Anti Static floor tiles prevents static buildup in the presence of anesthetic vapours.

For more information about medical equipment and (OEM) Original Equipment Manufacturers training, kindly make a request through our Facebook page messenger to us. Include your Email address in your post please. Or you may want to contact us. Meanwhile look forward to our new book ‘The Insiders Guide to Basic Medical Equipment Repairs.”

Electronic Symbol and Components

Who Really Uses Electronic Symbol and Components?

Design Engineers, electrical and electronic technicians and craftsmen all use electronic symbol and components. They use them at one time or the other. The engineer use them as materials for his/her design work. Meanwhile, in time of electrical installation, fabrication, or troubleshooting, all the professionals make use of them.

Electronic circuit symbols are symbolic representation of electrical and electronic components in a circuit or schematic diagram. Combination of components in a circuit and how they relate to each other determines how the circuit function. Meanwhile, position of a component symbols be it parallel or series with others determines its function. However, if you know how, you can fashion out a wiring diagram from circuit and vice versa.

Printed Circuit Board (PCB) and wiring installation is a product of circuits/schematic diagram.

How to read and interpret a schematic diagram

To read a circuit, you begin to trace from the left side of the board. But you need to identify power source and switch from other components and how they interconnect. Reading and translating wiring diagram is a skill in troubleshooting. However, if you can read, understand and interpret a diagram, you can easily identify and isolate problem areas in equipment and appliances.

To acquire the skill is not difficult, all you need to do is to identify each component, know all about each component, understand how one component relates to the other. Meanwhile, understand basic parallel connection, series connection and series-parallel circuit theory.  Listed below are examples electrical electronic components symbols.

Example electronic components and symbols listed are Transformer, Headphone, diodes, transistor, resistor and lots more.

Click on any of the Symbols for expanded view.
electronic symbols typical

For an exercise, get a simple circuit online. Identify the components in the circuit. Then, explain how the circuit works. Finally you can post the circuit and your explanation in the comment, or send as a feedback

Add IC Voltage Regulator to Wall Adapter

How to Add IC Voltage Regulator to Wall Adapter/Battery Often what you required to run an equipment or device is a well-regulated source of DC power.  To do this, you need to add ic voltage regulator Regulated power supplies gives out stable desired voltage output. You will even need one for your projects. In its…

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Transformer instructions

Basic Transformer Action Transformer instructions give answers to basic questions about transformer. This include principles behind transformer or transformer actions, transformer circuit, connections, current, design calculation, transformer functions and lots more. You will find transformer in many equipment such as UPS, Audio amplifier, DC power supply or Rectifier. Transformer in circuit use includes: Isolation Protection ⚡…

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Suction Apparatus and Suction Machine

A suction apparatus and suction machine is commonly found in the emergency room, the operating room (OR) and clinical wards. To begin with, it extracts fluids such as saliva, vomit and spittle from unconscious patient. This is normal during surgical operation and air from the bronchial airways and postoperative drainage of sites. This is done…

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Medical Suction Machine Fails! What to do?

medical suction machine Medical suction machine is one of the must check before starting a case. An anesthesiologist think through and its of interest to run through a quick checklist of machine; monitors; suction ; airways; IV; drugs etc. to ensure all needed stuffs are intact. There is a necessity to check all equipment and accessories especially the monitor; the anesthetic machine; and the suction apparatus. Notwithstanding, the user checked the items for availability. A Biomedical Equipment Technician need to ascertain all equipment are in good order to function.

Equipment Checklist Before a Procedure

Check the monitors for appropriate probes and secure sensors in place. Sensors are prone to damage through rough handling so its important to keep spare to avoid disappointment, inconveniences and embarrassment. Suction machine on its part are prone to fail due to leakages. The leakages come through cracked and worn-out rubber gasket. This occur at the edge of the lid for the reservoir bottle or from leaks at the joints between the patient nozzle and the reservoir. Similarly, between the plastic tubing and the catheter.

When you have checked the bottle is well covered and well sealed, the gasket rubber may be worn. Similarly if you have a trusty patient plastic nozzle, yet the machine do not come up with usable suction pressure, then, you may need to check the pressure control knob if it’s opened. However, if this is o.k. then, you need to get inside the machine itself. However, someone with technical knowledge is suitable for this tasks because a novice may leave the machine worst than he/she found it.

Problems with Medical Suction Machine

However, do not dismay if you are just starting out but you have some basic technical knowledge, you can confidently open the machine to check little error such as disconnected tubing but if the problem is more than that supervision in the workshop by more experienced technician is necessary. Meanwhile, you can learn more about suction devices

The problem with the machine is probably caused by a leaky capacitor, or open fuse etc. or faulty electric motor especially if fluids managed to escape the cut-off-safety valve into the pump. After you the repair is complete and the machine is now sucking, for safety sake, carry out electrical safety test and do pressure calibration. You need to check the negative pressure with pressure meter and ensure it tally with reading on the gauge. To walk through necessary steps and to receive  updates information and support on medical suction machine and general medical equipment repair and management series, you can Subscribe to Our Mailing List and Newsletter or give your comment below.

 

 

Transistor Switch Design

Precautions Switching Inductive Loads

Many times we need to switch inductive load like solenoid valve through a transistor switch. In fact, some tasks require powering a heavy load via a relay or a contactor. The solenoid valve, relay or contactor and any device with coil primarily acts as an inductor. This is because it’s a coil and the inductors do not like sudden changes in current.

Watch this video for thorough understanding.

Source: Ben Krasnow

However, if you interrupts the current flowing through a coil suddenly, for instance when you open the switch. The coil will react with a sudden very large voltage across its leads. Thus causing a large surge of current through it due to collapsing magnetic field, within the coil as the current is interrupts abruptly. Surges in current resulting from inductive spike can results in thousands of voltage. The inductive spike will possibly harm neighboring devices within the circuit such as switches, transistors and relay contacts etc.

Transistor Switch Circuit

In the transistor switch circuit, a way out of inductive spike is to use what is known as transient suppressors. The suppressor interrupts the current through the coil. Typical transient suppressor is a diode across the relay coil in the relay driver shown below.

Fig 1Fig 1 Relay Driver

The circuit above is a typical transistor switch control driven by an input voltage. When sufficiently large voltage and input current applies to transistor’s base lead, the transistor’s collector-to-emitter channel opens. Thus allowing current to flow through the relay coil. Take note of the diode across the relay coil to eliminate imminent damage to the transistor by voltage spike through the switching of the coil.

Sometimes they use an RC network as a transient suppressor especially for relay using ac. But it’s important to use a resistor and capacitor with rating for a potentially large transient current suitable to the coil current.

In the AC Driven Coil with RC transient suppressor shown above, the capacitor absorbs excessive charge. Then the resistor helps control the discharge to safe limit. A typical RC network for small loads driven from the power line uses 100 Ω Resistor and 0.05 µF Capacitor.

Transistor switch snubber
RC Snubber Circuit from Wikipedia.

Electrical Safety Best Practices

The subject of electrical safety for technicians revolves primarily around electrical safety grounding, electrical insulation, and control of humidity. Other factors resulting in general electrical safety are personal protective equipment, proper preventive maintenance procedure and knowledge of electrical safety basics. Electrical safety is an important subject for consideration for products that uses electricity. Safety is…

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