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IMPORTANT: Do’s and Don’ts

1.Always punch paraffin TMA block at room temperature. Cold paraffin can crack when inserting core samples.

2. Never Snap Freeeze the Arraymold. Liquid Nitrogen or other frozen baths will destroy the Arraymold and this type of practice will void the Arraymold warrantee. Refer to FAQ Q. 7 for detailed information.

3. Never push the dermal needle into a TMA block. This will damage the TMA block.

4. Do: Make a practice TMA block first to test your skills before you attempt to cut a real one.

PREPARING ARRAYBLOCK FOR CUTTING (New Video Click Here)

These simple steps will help you SET the punches in your paraffin Arrayblock and create a flat surface for cutting.

1st - Once punching is complete, set the block on an uncharged slide (face down) in an oven at 37C to 40C overnight.  In the morning, the block should be tacky and possibly stuck to slide.  DO NOT PULL SLIDE AND ARRAYBLOCK APART.

2nd – With Arrayblock still warm and tacky, heat another slide in an oven to around 70C for approximately 10 minutes. Take this separate HOT slide and place under slide stuck to Arrayblock. The Arrayblock surface should turn to liquid quickly. Move the two slides around on the Arrayblock to push any surface air bubbles away and to flatten Arrayblock surface.

3rd – Remove second slide and place Arrayblock with original slide (slide down) on a room temperature counter top for 10 minutes to cool. Once Arrayblock is room temperature, place Arrayblock and slide on an ice tray (no water) to cool for 20 minutes. Slide should remove easily from Arrayblock and it should now be ready to cut.

FAQs

Q 1. How should I store the Arraymold when it is not in use?

A. One of the unique benefits of the Arraymold is its size. It doesn't take up counter space when not in use. It is best to store the Arraymold in a dark dry place. When not in use keep the Arraymold in its box in a drawer away from chemicals and light.

Q 2. If I don't need the full 60 cores how do I make an array without extra holes?

A. The Arraymold can be customized to any number to whatever size is needed by filling unwanted holes in the paraffin Array block with blank paraffin cores.

Q 3. What is the depth of the Arraymold cores?

A. The 2 mm 60 core Arraymold is 7 mm. The 1.5 mm 150 core is 4 mm deep. The reason why the 1.5 mm core depth is not as deep as the 2 mm is because during testing we found that because 1.5 mm cores are thinner, the shortened depth cores strengthens the rods so they last longer.

Q 4. What is the best way to judge the core depth for creating paraffin array using the Arraymold?

A. If you need to judge your depth, the best way would be to take a Sharpe marking pen and mark the needle to the maximum depth and stay within this distance. This is especially important when punching with the 1.5 mm Arraymold needle.

Q 5. After repeated use, a few of the rubber rods in the Arraymold have broke off. Is it still possible to still use it?

A. Yes, but you will now have a blank spot in your paraffin Array or Cryoarray where the punch rods are missing. Be gentle when pulling the paraffin Array or Cryoarray block out of the array mold. Working slow and gently is the best way to keep the Arraymold rods intact.

Q 6. My Arraymold has cracked or split. Do I need to order another kit or is it possible to continue using it?

A. Yes, the Arraymold can still be used to create Array blocks. If the Arraymold cracks or splits due to repetitive use, a rubber band or tape can be used to keep the Arraymold together when paraffin or frozen embedding medium is poured into the Arraymold.

Q 7. How cold can I make the Arraymold before it will brake?

A. The Arraymold is optimal at -10C to -30C. DO NOT SNAP FREEZE the Arraymold instrument in liquid nitrogen or other type of frozen chemical bath. This will crack or damage the Arraymold. During testing, we have placed the Arraymold into a -80C freezer and it did become ridged, but did not crack. Once it thaws to around -30C it was flexible again. The Arraymold is designed to use in a cryostat as well as for paraffin molding. The recommended temperature range for frozen Array construction is between -10C to -30C. Snap Freezing will void your warrantee. Be gentle when pulling the embedding medium out of the Arraymold to prolong its use.

Q 8. How many paraffin arrays have technicians been able to produce from a single Arraymold before it became unusable?

A. The number of uses depends on the technician and how well the Arraymold is treated. Some labs have been able to create up to 40 molds from one Arraymold. With proper care of the Arraymold it has the potential of giving you many arrays.

Q 9. I had difficulty pushing the stylet into the disposable dermal needle. What is the best way to insert the Stylet into the dermal needle?

A. Before using the needle, gently push and twist the Stylet down the needle before beginning an array. You may notice some plastic coming out of the dermal needle as the Stylet goes through it. This is left over plastic from manufacturing when the metal needle was pressed into the plastic handle. Once the Stylet is through the needle, push it in and out several times. Now you are ready to punch and insert cores.

Q 10. What paraffin do you recommend for paraffin array construction?

A. We have done some field-testing with histologist and found that most Histologists prefer using Paraplast X-tra for constructing and cutting Tissue Microarrays. It is a sticky paraffin and it keeps the cores together better then harder paraffins. Some parffins that people didn't like were Richard Allen Type 9 and 3. (Type 9 and 3 are excellent for normal sectioning but not good for TMA cutting.) This is only a recommendation so please test it for yourself to know what works best for you and what is easiest to section.

Q 11. Is there a specific type of cryostat embedding medium you recommend for frozen arrays?

A. The best thing we would recommend is to experiment. Create a frozen array first using hotdog samples and test the embedding medium in your lab. As we hear from technicians we will try to update this section.

Q 12. When I was cutting my Cryoarray punches became loose. What can I do to eliminate this problem?

A. The punches need to be set into the embedding medium. This is done by melting the surface of the Cryoarray block on a metal plate and then freezing it again before sectioning it in a cryostat. This step may need to be repeated as you go deeper into the Cryoarray block. For further clarification review the instructional video to understand this process step by step.