Micro Needle Tip

Micro Needle Tip
Needle Tip

I never know when to use small needle, micro needle and nano needle. For this needle I decided to use micro needle tip. Many of our competitors show you pictures with their products next to a coin so you can easily compare how small they are. We on the other hand put the needle right on top and focused in so you can see if you can guess what type of coin it is.

This particular micro needle tip is going to be welded on to a .013″ stainless steel tube with a hole in the tube for drainage or for drug emission. The .0057″ shoulder helps guide the tip into the tube which has an ID of .006″. The .004″ step is used as a guide to know where to cut off the shoulder.  The tip is 25 degrees sharp. The most difficult part of this piece is connecting the tip to the tube due to the small size of both. Grinding micro parts is the easiest part of the process.

Needle Tip

Styman Pin

We have had a few customers call in asking for Styman Pins. To the best of our knowledge and with a thorough search of the American Medical Dictionary we were unable to figure out what exactly a Styman Pin is. We generally point these inquiries to Steinmann Pins.

If you are ever not sure what type of medical wire, pin or screw you are looking for, don’t hesitate to give us a call, we will point you in the right direction.

Happy pin hunting!

Improved K-Wire Manufacturing

We wanted to share some exciting news. In the last year Modern Grinding has drastically improved our K-Wire capabilities due to increased customer demand and needs. We recently purchased a new grinding machine which is highly automated and makes amazingly sharp trocar tips and diamond tips, perfect for K-Wires. We have also started stocking common stainless steel wire sizes and some nitinol wires as well.

What does this mean for K-Wire Designers and Suppliers?

With our improvements, we are able to achieve faster lead times, higher quality, higher repeat-ability and more competitive pricing. If you have K-Wire needs or would like to re-quote your project, don’t hesitate to reach out. We have manufactured K-Wires in quantities of 50 and 100,000 alike. Don’t hesitate to reach out.

Coronary Guidewires

Many of the guidewires we manufacture at Modern Grinding are Coronary Guidewires. We are a contract manufacturer, we don’t have any of our own products. For our own knowledge base and hopefully for medical device designers, this will help provide a better understanding of coronary guidewires and the different designs. Below are the common guidewires and design considerations:

Some examples of standard guidewires include the BMW (Abbott Vascular), Cougar (Medtronic), IQ (Boston Scientific) and Stabilizer (Cordis).

Depending on the type of surgery you would like to perform, the following guidewire traits must be considered:

Guidewire Torque

Is an ability to apply rotational force at a proximal end of a guidewire and have that force transmitted efficiently to achieve proper control at the distal end

Guidewire Tracking

Is an ability of a wire to follow the wire tip around curves and bends without bucking or kinking, to navigate anatomy of vasculature

Guidewire Steerability

Is an ability of a guidewire tip to be delivered to the desired position in a vessel

Guidewire Flexibility

Is an ability to bend with direct pressure

Guidewire Prolapse Tendency

Tendency of the body of a wire not to follow the tip around bends

Guidewire Radiopacity

Is an ability to visualise a guidewire or guidewire tip under fluoroscopy.

Guidewire Tactile feedback

Is tactile sensation on a proximal end of a guidewire that physician has that tells him what the distal end of the guidewire is doing

Guidewire Crossing

Is an ability of a guidewire to cross lesion with little or no resistance

Guidewire Support

Is an ability of a guidewire to support a passage of another device or system over it

Guide Wire or Guy Wire

This is a question that many people were typing into google so we thought that we would help you out.

Guide wire which is also sometimes spelled as guidewire, is used to guide another medical instrument into place such as a catheter. They are small wires with diameters often less then 1mm.

guy-wire or guy-rope, also known as simply a guy, is a tensioned cable designed to add stability to a free-standing structure.

I hope this answers the question once and for all. Here is more information about guidewires.

Wire Manufacturers Cycle Speed Test (Time vs. Quality)

As custom wire manufacturers we often manufacture small runs (100, 200, 500) of prototype products. Manufacturing quality is and always will be our number one goal. Often times we come to a cross road trying to determine what is the fastest cycle time that we can achieve while keeping quality constant. When we are only creating 100 products, there is little reason to run cycle time trials since the production size is so small. To run a cycle time test, you need to check every part after you are done. You then need to check every product for a series until you are confident that the speed will not affect products over the long run.

This post was meant to spark more questions than solve. I wanted to discuss our process. If you have your own process methodology, we would love to hear it. Please email any discussion pieces to info@moderngrinding.com. We recently had a job which took us 4 minutes per piece when we started out. By the time we were done, we could create the same product in less than 1 minute. This was a larger 20,000 piece order. We did time tests out of necessity.

Cycle Time Test Considerations

  • Initial Quality Check
  • Repeat-ability of Cycle Time and Quality
  • Does the Wheel Wear Faster?
  • What is the Optimal Speed Adjustment Size?
  • Should we manufacture faster but grind the wire multiple times?

The optimal speed adjustment size is the biggest factor to test. At Modern Grinding, we time test by speeding up the cycle time 6% each time for the first ten cycles. We then take all of the finished products and measure them against each other to make sure that they are all in spec and they are no material changes in shape or sharpness.

To date, we have only run this type of trial once and it was for a 20,000 piece order. I believe that having a standardized process could help shave large amounts of time off of manufacturing. We are interested to hear if you have tried a similar process and if you have any suggestions.


Google Enters the Smart Medical Device Market with a Contact Lens

The market for smart medical devices continues moving forward at a rapid pace. Google just announced a new contact lens for diabetics. Here is the official announcement from Google. Modern Grinding is pleased to be a part of the smart medical device market from the manufacturing end of the spectrum. While we haven’t built anything close to a smart contact, we have assembled several wire products for monitoring internal vascular signals.

Google is seeking FDA approval for the smart contact lens which will be able to monitor glucose levels via tears that are captured in a sensor between two contact lenses. The device then has tiny led lights which will light up when glucose levels are out of range.  For fun, we wanted to try to reverse engineer how someone would make this type of smart medical device.

Glucose Sensors

IEEE Life Sciences notes a paper from February of 2012 with a MEMS affinity sensor for detection of glucose. Its length and width are each approximately 750 µm. 750 µm equates to approximately .75 millimeters, which is small but noticable. I assume the reaserchers at Google can acheive a smaller footprint it they absolutely need to – http://lifesciences.ieee.org/articles/79-recent-advances-in-mem-sensor-technology-biomedical-applications

Micro LED Light MEMS

There are a lot of micro LED light options, here is one source but this might be too large http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-20-6-6097. Personally, it seems like having the contact lens report back information is overkill. There is an antenna on the contact, if there is the ability to transmit information wirelessly, to say Google Glass, that might be the best option. I  can understand why Google would want to pursue this as it might be the beginnings of Google Glass in contacts, but it seems like overkill.

If any readers have additional information about how this product might be made, please send them along. Modern Grinding manufactures electrodes and wires for smart medical devices and smart guidewires.


Taper Wire

For this edition of The Wire we thought it was fitting to demystify taper wire both from a manufacturing standpoint and a medical standpoint.

Taper Manufacturing

To my knowledge, the best way to taper wire is still though the OD (outside diameter) grinding process. There may by 3d printers which can build tapers through an additive process but for small precision medical wires, the best way to taper is by grinding off material around the radius of the wire. From a cost standpoint, having a guidewire with a taper is going to be more expensive than just having a straight wire since there is an added manufacturing component to the product. Calling out specific dimensions on your taper drawing can be difficult for your manufacturer to achieve. Most often the tapers that we achieve have generalized specifications such as when the taper begins and when it ends. If you are trying to achieve specific taper angles, make sure to talk through these angles with your manufacturer in advance to make sure that there are not extra costs and time constraints to doing so.

Tapers in Medical Devices

The use of mandrel tapers, guidewire tapers and stylet tapers has grown more prevalent as precision manufacturing process has evolved. From a medical maneuverability stand point, doctors may have an easier time using taper wire. Tapering wire enables the wire to have different characteristics such as flexibility and firmness. As an example, we have manufactured wire from from .024″ down to .001″ in diameter. Taper wire can be more atraumatic than the alternative since if you are putting inside of a vessel a smaller tip may be easier to fit in than the full radius of the wire.

If you have questions about tapering your next guidewire, stylet or mandrel don’t hesitate to reach out, we can help. We have manufactured flexible guidewires, superstiff guidewires, stiff guidewires, taper wire, taper coil and any other type of wire you can imagine.

Safety Ribbon or Safety Wire in Guidewires

The following is to help medical device designers better understand safety ribbons in guidewire design.

In the unlikely event stretching or fracturing occurs in the guidewire, a safety ribbon is welded to both ends of the wire to help the wire remain intact. A safety ribbon runs thru the length of the Guide wire and is welded at each end to contain the coil of the spring.

There is a good explanation of a patented safety ribbon here – http://www.google.com/patents/US5299580

A safety ribbon or core wire is commonly included on the distal end of a medical guidewire or a fixed wire catheter insertable intravascularly into a patient. Such a medical guidewire or catheter has a relatively flexible distal end usually comprising a coiled member for facilitating navigation within the patient’s vascular system. A distal end tip, which can be formed by a suitable welding process, for example, is often formed or disposed on the distal end of the coiled member.

Modern Grinding has the capability to manufacture safety ribbon as well as grind core wires, form coils and perform wire welding on the finished product.