Manman Reamers

                                         -Mr. Madhukar Gokhale

      A drill cannot be relied upon to produce a hole having sufficiently good quality of finish and accuracy for many purposes, and so, when accurate holes are required a reamer must be used for finishing to the size.

     The reamer does not originate a hole in the same way as drills do, but imparts the necessary smoothness, parallelism, roundness and accuracy in size to the previously drilled hole.

   Reaming will however not correct any errors which may be in the drilled hole regarding its position or direction because reamer merely follows previously drilled hole.

   We are manufacturing flexible reamers for last many years, off course, this development is in consultation with senior Ortho surgeons. Initially, I manufactured reamers using wires but these reamers failed because of unwinding of wires. Then I tried reamers with flat strips. We have taken care that reamers will not unwind on changing the direction.

    We are providing guide wires with ball tips and without tips. The guide wires are provided with a flat surface for taking hold for withdrawal. We are also providing transfer tubes for guide wires. To start, you must first use fixed head reamer. Because it has a starting taper, it automatically aligns with the center at the hole.

   You should use reamers advancing in steps of 0.5mm. We have manufactured reamers from 8mm ø to 15mm ø. Clean the reamers frequently, remove bone debris from the reamer flutes. Do not use blunt reamers. Always use high-torque low RPM power source. We manufacture 400 RPM reaming hand pieces; and 200 RPM also can also be provided on request.

                                

BASIC ENGINEERING SKILL 

FOR SURGEON 

PART-1

Madhukar Gokhale - mgg@manmanindia.com

Since last many years I am working with you. I thought that I must bring some small things to your notice. Recently, one of my team members was in an Operation Theater. He was servicing the drill hand piece. The drill bit was in the chuck only. He was surprised to see that the bit was completely blunt. He asked the theater assistant to replace it. The assistant brought a bunch of drill bits in a tray along with other parts. He picked up a drill bit to replace it but that was also blunt.

This incident made me realize that nobody cares about sharpening the bits. The drills are required to be sharpened at intervals. Every time, before use, you must insist about this. 

Here’s a brief information about sharpening of the drill bits. I feel you must care for drill point that will facilitate the drilling.

The following sectional views shows the effect of errors in drill grinding. In the first sketch, it shows how the perfect drilled hole is possible and the next how not!  

Please see the above figure. They are self explanatory. They show the geometry of drill sharpening. The cutting angle depends on the hardness of the surface to be drilled. For hard surface like metal, its 118 degree but for bone it should be less. For very soft material it should be even lesser (i.e Sharp).

In fig. A, side view of a twist drill is shown. The metal behind cutting edge AB the correct angle for slope is 12 degree.

In fig. B, a sketch is shown at  looking level with the cutting edge AB, and it will be seen that the effect of the twist formation of the drill (AC) is to give cutting rake.     

In fig. C ,when properly ground, drill point should be central and the lip angles equal. The metal behind the lip should be as in fig. A and the line across center of the web should be as shown in fig. D

In fig. E, for checking the grinding of the drill point a simple gauge is shown.

In fig. F, for drilling large holes, feeding pressure can be reduced and the drill maybe made to cut faster by first drilling a small ‘lead hole’, as shown. 

NOTE :

When drilling deep holes, release feed occasionally and withdraw the drill. Remove chips from bottom of the hole.

If you want to check the straightness of the drill bit, just roll it on a flat surface. If you see the movement awkward it is not straight.

                                                *********

Narendra Modi Speech at Reliance Foundation Hospital in Mumbai - 99tv

Technical Care

Guest Editorial

Technical Care

 Manman Wire Driver 

Manman Wire Driver  e, specially designed for K Wire driving with output speed of 1000 (rpm). A special autoclavable motor - tested for 1000 autoclaving cycles - is used for better functioning & to achieve Torque required for Wire driving. 

Compact, light weight (weighing 470 gms) and ergonomically designed grip help user to achieve a comfortable feel, while in operation. The wire driver is designed for a wire diameter range from 1.00 mm to 2.3 mm for all Troker & Bionet wires with or without olive.

    Manman Wire Driver  E is supplied with a Power Console  non Autoclavable - with operating voltage of 220 volts-AC (Input Supply) & a flexible, extra light weight, Autoclavable Power Cable with Stainless Steel male connectors for quick coupling of Wire Driver Hp with the power console. A simple foot operated switch is provided for controlling the On /Off function of Wire Driver for giving the surgeon a complete control of the unit. Speed of the wire driver can be adjusted with 'Speed Control' provided on the Power Console.

        The function of Wire Driver is aimed at helping surgeons minimize their non-operational time. Loading of K wire is simplified with spring loaded cap. Pull the cap ahead & rotate in anti-clockwise direction to insert wire to desired length from front end, then reverse the action & release the cap to hold the wire. Using Wire Driver is a pleasure with a unique function of gripping off wire while driving the wire into bone & automatic release of wire when pulled back. This action saves the surgeon's time & fatigue.

        A detachable guard can be fitted at the rear end of the Hand-piece to cover the revolving end of wire protruding out of it to safeguard the surgeon when operating with extra long wire (14 inches long).  

     K wires of various diameter & length are also available. Standard sizes available are 

K wires of various diameter & lengths are also available. 

Standard sizes available are :

dia 1.5 x 14”  Troker with Olive   

dia 1.5 x 14”  Troker without  Olive

dia 1.5 x 14”  Bionet with Olive  

dia 1.5 x 14”  Bionet without Olive     

dia 1.8 x 14”  Troker with Olive 

dia 1.8 x 14”  Troker without Olive  

dia 1.8 x 14”  Bionet with Olive  

dia 1.8 x 14”  Bionet without Olive  

Take Tech care

Repairs and Services

Electrical Contact Problem and Solution

            NEW STERNUM SAW

       

Manman Sternum Saw is in use for several years. In last few years we have done modifications in the shape of the Sternum Saw but we have not included it in our production list. 

       I am giving the details of few models of Sternum Saw which are now available on our product list. The first one is Revolving Head. 

    Many surgeons found the driving shaft inconvenient when moving up or down. It creates a sort of drag on the hand. We have changed the mechanism and now you will see the head is revolving and no more drag.

      Recently we finalized the Pediatric Sternum Saw where the demand was for the anchor to be small with a reduced width of blade. A photograph explains the Paediatric Sternum Saw. There are three other shapes also available - Stub, Slick  and Paediatric.

 Neuro Product - Craniotome & Perforator System

 The Manman Craniotome and Perforator System (Electrical) is in use in India for more than 20 years. We are striving to maintain the quality of the hand piece that is mainly about the Anchor and Cutter. In case you come across any difficulty or any irregularities, do not hesitate to contact us. Your suggestions are also welcome and you may email them at: info@manmaninda.com

                Mostly we receive complaints and suggestions about handling the dura and performance of the cutter. In such cases, if you send the hand piece directly to us we will take immediate corrective action. When I say the repeated usage of Craniotome is yet to be standardized, I mean there is no fixed number that tells us how many times a cutter should be used. Since the availability of the cutters was less earlier, the same cutter was used for more cases. Now, the cutters are available in plenty. 

            We are also facing repeated problems of bending of the Anchor. The thickness of the anchor is less than the diameter of the cutter. The anchor is neither likely to jam in the slit nor to bend. The bending of the anchor 

            Sometimes the theater technicians or persons in autoclave department forget to put the cap on the Craniotome hand piece. The purpose of the cap is to protect the Anchor and Craniotome. This is not achieved if the cap is not in position. We are also working towards improving the material of the anchor.  

               A good suggestion that came forth from some surgeons was to increase the diameter of Perforator Cutter. Dr. Vilas, a Neuro Surgeon was very much in favour of having a Perforator of 20mm size. I was reluctant to directly go for that size. So we developed one perforator of 20 mm on trial and to my surprise it was successful. The only hitch was that the output power of the existing Perforator hand piece was not sufficient. We had to develop a perforator with more output power and it was tried at Pune Institute of Neurology. After many such trials we further prepared other sizes of 18mm, 16mm and 14mm. The previous Perforator Cutters of 12mm, 10mm and 8mm can also work on the same hand piece. Of course, we will have to go for a new Perforator of less revolutions! If you are interested to know more, email to: info@manmanindia.com.  

  

                There is another new suggestion for having a revolving connection at the top of Craniotome hand piece. This may be more convenient in handling. I will elaborate in the next bulletin.

 The Manman Craniotome and Perforator System (Electrical) is in use in India for more than 20 years. We are striving to maintain the quality of the hand piece that is mainly about the Anchor and Cutter. In case you come across any difficulty or any irregularities, do not hesitate to contact us. Your suggestions are also welcome and you may email them at: info@manmaninda.com

                Mostly we receive complaints and suggestions about handling the dura and performance of the cutter. In such cases, if you send the hand piece directly to us we will take immediate corrective action. When I say the repeated usage of Craniotome is yet to be standardized, I mean there is no fixed number that tells us how many times a cutter should be used. Since the availability of the cutters was less earlier, the same cutter was used for more cases. Now, the cutters are available in plenty. 

            We are also facing repeated problems of bending of the Anchor. The thickness of the anchor is less than the diameter of the cutter. The anchor is neither likely to jam in the slit nor to bend. The bending of the anchor 

            Sometimes the theater technicians or persons in autoclave department forget to put the cap on the Craniotome hand piece. The purpose of the cap is to protect the Anchor and Craniotome. This is not achieved if the cap is not in position. We are also working towards improving the material of the anchor.  

               A good suggestion that came forth from some surgeons was to increase the diameter of Perforator Cutter. Dr. Vilas, a Neuro Surgeon was very much in favour of having a Perforator of 20mm size. I was reluctant to directly go for that size. So we developed one perforator of 20 mm on trial and to my surprise it was successful. The only hitch was that the output power of the existing Perforator hand piece was not sufficient. We had to develop a perforator with more output power and it was tried at Pune Institute of Neurology. After many such trials we further prepared other sizes of 18mm, 16mm and 14mm. The previous Perforator Cutters of 12mm, 10mm and 8mm can also work on the same hand piece. Of course, we will have to go for a new Perforator of less revolutions! If you are interested to know more, email to: info@manmanindia.com.  

  

                There is another new suggestion for having a revolving connection at the top of Craniotome hand piece. This may be more convenient in handling. I will elaborate in the next bulletin.

Ortho Product- Reverse-Forward Handpiece

  At the recent IOACON at Chennai we demonstrated Reverse-Forward hand piece. You may wonder why I am mentioning about it. We have done some interesting work. Now, it makes less noise. When you are using it as a drilling hand piece and you want to reverse it, the New Reverse-Forward Drilling Hand piece makes that possible at a speed of 1200 rpm approx.

          Another hand piece but with A/O Coupling has lesser speed that is 350 rpm. Both the hand pieces are having 5mm cannulation. The weight of the drilling hand piece is 800 gms and the A/O COUPLING hand piece weighs 835 gms. 

           We have taken care to reduce the noise of the gearing. But when changing gears, care should be taken. In any gear changing situation, a pause is required. So it is with the Reverse-Forward hand piece. By default the hand piece rotates in forward direction only. When you want it in reverse mode, the trigger needs to be pulled. It is advised to take a few seconds pause till the rotary motion stops. Then pull it further till you get the feel of change and the reverse rotation starts.  This care will avoid noise of chattering while changing gear.              

                                    Controlling Forward & Reverse

Reamers 

We have manufactured new Fixed Head Reamers of 5mm and 5.5mm size. It is already delivered to Dr. Jain Rajeev of Raipur, MP. If you are also thinking of having this interesting size please email your order at: sales@manmanindia.com 

Sternum Saws

We are participating in Cardiac Conference at Mumbai where we will be demonstrating different types of Sternum Saws. We manufactured these Sternum Saws on special request from the surgeons.  You can place your enquiry with info@manmanindia.com 

Craniotome 

We are participating in Second Neuro Surgeons' conference at Jaipur. Where we will be demonstrating different types of Cranitomes. These types are the outcome of our conversations with our users at the time of surgery. We would like to share your views also. Visit the conference or email for more details at info@manmanindia.com