t:slim, now I’m impressed

I’ve had a change of heart.  Awhile back, I wrote a rather popular blog post about the t:slim insulin pump, and why I felt it wasn’t right for me. This was based on published descriptions and a video glimpse of a pre-release model.  I said I’d stick with function over form, substance over style.

But then a bunch of other people got t:slims and started writing about them: in comments, in blogs, in tweets.  Meanwhile, Tandem diabetes had taken to social media in a big way, not only for self-promotion but in a truly interactive manner, answering questions and publicizing blogs about their product. They even came up with a new t:clip to replace the unpopular t:case. Most recently, we’ve learned that they’re deeply involved with JDRF in an Artificial Pancreas trial using a dual-cartridge mechanism that can deliver, presumably, insulin as well as glucagon.

Color me impressed. These folks never stop working and never stop innovating. Tandem, I was wrong about you.

* * *

Oftentimes, I find myself going back to that original post just to remind myself what turned me away from the device in the first place.  What I found is that my original concerns are pretty much non-issues at this point.  Let me elaborate.  (Excerpts from my original post are embedded below)

“First, the home screen.  We’ve seen it in pictures, and it’s beautiful ….  The problem is, it takes too long to get to it.  Unlike my Medtronic which always shows the time and the amount of insulin and battery-power I have left (albeit crudely), you need to slide a doohickey along the top to light up the screen.”

As Kari commented on that post, the important information is right there as soon as you press the button on top to “wake-up” the pump, prior to the 1-2-3 sequence. And by “important information”, that includes the Insulin-on-Board, which everybody seems to absolutely love.  In order to get the IOB on my Medtronic pump, I have to either press ESC twice and scroll through that awkwardly-placed list of information, or press ACT seven (yes, seven) times to go through the menu and bolus-steps where it (new to the Revel) tells me my IOB next to the part where I say how many units of insulin I want.  If it’s dark, I need more keystrokes to illuminate the backlight.

This is where Medtronic hides the Active Insulin (IOB)

After pressing ACT on the Medtronic 7 times, the Active Insulin (IOB) becomes visible

By the way, I find myself using the backlight more and more lately, either by pressing the down arrow in the Medtronic “home” screen or by pressing the down-arrow and the “B” button simultaneously (two-handed operation!) if I’m in the middle of another operation. There are some keystrokes I hadn’t previously accounted for.

So, the home screen seems just fine to me. And as I’ve learned from my Contour NextLink meter, this type of display really doesn’t require a backlight anyway.

“Second, the t:slim seems to require two-handed operation.  I can do almost everything I want with my current pump with one hand (except change the battery or reservoir; that’s a given).”

Along with the two-handed operation comes a plethora of additional features that are easily accessible.  With the incorporation of the CGM, the Medtronic pump has gone from one “status” screen to three (one graph, two text), and finding stuff in that four-line display has proven quite awkward. So is scrolling through my old boluses, trying to figure out which time/date-stamp goes with which carb or BG number. All the data stored in my Medtronic pump has outgrown the display on which to view it – and that can be quite frustrating.  Then there are the layers upon layers of menus, going deep into one menu, then backing out of that to go into another menu. As I try to learn more about the advanced features of my pump, the ups-and-downs of menu navigation rival the ups-and-downs of blood glucose.  t:slim’s navigation seems much easier.

And I suppose using a finger on my left hand is better used to navigate a pump than to flip it the bird.

“And speaking of buttons, one of the nice things about buttons is that you can tell where they are without looking.”

And the reason I navigate without looking is because the buttons can be hard to find without light (the backlight only applies to the display, not the buttons). Hit the wrong button, and instead of clearing an alarm I just “Easy-bolused” half a unit.  Oops!

“I hate the USB.  Oh lord, how I hate those things…. physically they are about as brittle and annoying as they come.  After repeated plugging/unplugging, they become loose, and the cords become useless rather quickly…the mere presence of a port – a port of any kind – means an entry-point for water, and that can be deadly”

I’m still not a fan of the USB port, but I suppose I can accept it as an industry standard.  Proprietary ports are even more frustrating. I just hope that the USB that Tandem supplies is made out of something a little stronger than the flimsy aluminum that other devices use.  Also, some of the photos that Sugabetic shared in her post about charging the t:slim show cover that protects the USB port from water. I’ve still never seen it in person, but I do feel a bit better about it.

“the insulin is stored in an opaque container, so we have no way of knowing if there are any air bubbles until they make it into the tubing”

All I can say is that I’ve heard of no problems of air or anything other than insulin in the tubing (except for the odd Apidra occlusions.)

“It doesn’t talk to any sort of Continuous Glucose Monitor, and to my knowledge, not even a blood glucose meter.”

This is a biggie. As is the current absence of a way to download and process data. But Tandem does have an agreement in place with Dexcom, and I believe them when they say t:connect will be coming soon.  And based on their speed in redesigning the belt-clip, when they say these new features will be coming soon, I tend to believe them.

* * *

More good stuff…

Well, having that IOB information front-and-center may lead me to use it more often and not stack boluses. I’m not sure how it’s calculated (if it’s a linear decrease from the time it’s delivered until the time it’s expired or if it fits some kinds of curve), but then I’m not certain how it works in my current pump either.

I’m hoping that big screen can give me a nice, easy-to-read summary of my previous boluses and my daily totals, and can help me navigate to what I want to do quicker.

A bigger, hi-res screen could separate one event from the next

A bigger, hi-res screen could separate one event from the next

Having profiles adjust the carb ratios and correction ratios is huge!  I find myself always needing more than is recommended at breakfast time, and even before bed. Whoever thought that an active versus a sedentary body would require different basal factors but identical bolus factors must have been oversimplifying things.  (There is also the monthly-cycle thing which, obviously, men don’t have to deal with).

* * *

 In conclusion…

I get the feeling that Tandem is kind of like Google. Always thinking and improving, and constantly rolling out tiny little improvements.  In contrast, Medtronic is like Microsoft: they have one big release, then it’s several years until the next “big thing”, but little to get excited about in between.  I’m excited about Tandem’s plans for the future, including their Dexcom-integrated, software-interfaceable, dual-cartridge pump. Medtronic’s plan for the future (as far as I know) is to sell something that’s already available in Europe to people in the States.  Quick and dirty, or slow and steady? The latter may be more reassuring, but the former is certainly more exciting.

Yes, the t:slim has some annoying quirks. All devices do. Part of the decision would be of sticking with a quirk I’m familiar with or trading it for one I’m not used to.

Of course, this entire post is moot. I’m not due for a new pump yet, and it’ll probably be a few years until I am. Will I be ready to leap over to the t:slim at that time? I really can’t say. There’s something to be said about the proven and established leader in insulin pumping. But will it be worth a close look? You betcha.

* * *

 I’d especially like to thank the following blogs/bloggers for being among the first to try the pump, and for sharing their reviews, descriptions, and photos with the rest of the community. Your descriptions and enthusiasm have a big part in me changing my opinion of this new device: Sugabetic (Sarah), Sweetly Voiced (Melissa L), Life after Dx (Wil), Type 1 @18 (Melissa T).

Note: the opinions expressed, and my decision to express them, are purely my own. I received no requests, compensation, encouragement, threats, favors, or coffee (except that which I paid for) in connection with this post, nor do I expect any.

Posted on January 11, 2013, in Diabetes, Insulin pump. Bookmark the permalink. 14 Comments.

  1. The USB port is waterproof even WITHOUT the little plastic cover being in place. I confirmed this with the company. I’m in my first moth of usage. It also charges really fast.


  2. Scott, thanks for such a detailed post. One of the things I really like about this community of bloggers is their (your) ability to tell it like it is, then re-examine their subject with an open mind later. Thanks

    I’m also jealous of your ability to get photos of the Med-T screen without the flash destroying half the view in the picture.


    • Well, I still get so many hits on that original post (usually from Google searches), and since I don’t still believe everything in there, I felt a follow-up was warranted. I also added a note to the top of that other post directing readers here.

      But, truly and honest-to-God, I am impressed. (Yet I’ve still never held one of those things!)

      I’ve learned the best way to get those photos is to turn the pump backlight on and the flash off. But how ironic is it that none of my photos are of the pump I’m writing about??


  3. I have been pumping with a Tandem t:slim since late November 2012. My second pump has failed. Both times the silver button on top of the pump, which turns the pump screen on and is also used to enter and deliver a quick bolus, stopped working. This lack of durability is unacceptable. I regret my decision to get a t:slim and am going to try to get coverage for a different pump.
    I like the readability of the touch screen; I like all of the information that is on the opening screen; I like the pump’s small size and the streamlined t:clip. For those concerned about the rechargeable batttery, I was too, but it charges really quickly and the charge lasts a long time (I estimate 10 days). 5 to 10 minutes per day on the car charger will keep it topped off.
    I only require about 60 units of insulin for 3 days, so I dislike the fact that one must fill the cartridge with a minimum of about 120 units. Supposedly it requires 100, but the pump doesn’t detect all of the insulin you inject. Filling the short tubing takes about 18 units. This feels like a waste of insulin to me compared with my paradigm pump.


  4. I’ve been doing a research project over the past year with a local provider and one of the drug companies making insulin. The study requried a minimum of 6 BG tests per day and the data was transfered via a “pad” to the mainframe, then to the staff for determination. Insulin was delivered in two ways. During the day and prior to bedtime I used my Medtronic pump. At bedtime I injected the research insulin at a rate provided by the local provider.
    I mention this because I’ve been a pumper for several years and like many of the posts waited patiently for Medtronic to get FDA approval for their improvements. In Europe the process is easier, albeit not always safer. In fact I’ve read of insulin pumps that resembled an iphone and they could do CGM. Additionally there was/is a database of culinary items and corresponding carb data. Finally, take the device and place it over your heart and the screen illustrated your heart data similar to a full on EKG.

    Yesterday my Doctor said I should look at the t:slim. She favors their “home” page data and so on and so on. Now that I’ve read comments from t:slim users I’m thinking I’ll join the band and make the change. My Medtronic pump is using batteries like crazy and I’m thinking my 7 year old pump is about to have cardiac issue and croak….so before It does I’m contacting Tandem and I’ll write my own reviews. I tried Medtronics CGM and the process of managing two sites, the transmitter, the manual CG checks and adjustments was too much fuss, although I am in complete understanding of the mechanics. I’m thinking we will get to a synthetic pancreas because of companies like Tandem. It costs a fortune to develope and get products to us, the users……..but then again when you think of the alternatives……..well I can hit a few buttons and draw blood like a vampire if my life is extended. Thank you for making this opportunity to say how I feel. I had Type I onset diagnosed 13 years ago.


  5. whew! I had just finished reading your previous post in which in a false-feeling review re the t:slim was found less favorable than the t:slim, for several reasons, of which I felt compelled to accept exactly ZERO of the reasons as you described them. I am a PROFESSIONAL lurker of blogs, chat-rooms, as well as diabetes pumps and accessories makers and shakers. HOWEVER, having now witnessed you coming into the light has changed all of the rhetoric I was going to deliver. The t:slim vs medtronic is tantamount to an Infiniti FX35AWD to a Yugo. And, I’m glad that you, having had a spiritual awakening as a result of actually TRYING the 1, 2, 3 instead of reporting what you think, based upon never having seen or holding a t:slim. So, instead of name-calling and placing a real rant in response, I can now state that I’m happy for you, and that you got to TRY s t:slim. They really are great, aren’t they! (BTW, I’m a 16 year pumper, and have run through Diesetronic for about 2 years (back when they shipped TWO pumps, in case you had to send one in for repair), Minimed (later to become Medtronic) for about 8-9 years, thru several models, untill I could no longer take the shitty, better-than-you attitude of a large portion of the support staff, and now, for about the last 6-8 months with the Champion Motor Trends Insulin Pump of the YEAR, the Tandem t:slim! (Did you know that Tandem is getting ready to roll out a pump with a 500mL reservoir? Its TRUE! And, as the years have progressed, so has my tolerance, as well as my need for bigger doses. So, it is with great anticipation that I am biding my time, waiting for the release. Happy Pumping! And I really am glad you got to try the t:slim!


    • Well, FE, I must say that I do admire your enthusiasm. I’ve never seen someone so eccentric over an insulin pump before. However, I should clarify something that you may have been missed: I STILL have never tried the t:slim. Never even seen one, except in pictures. I’m quite happy with my Medtronic, and right now, nobody matches the Carelink reports or built-in CGM that Medtronic does.

      Having said that, you seem to have used several different pumps, so I’ve got some questions for you. If you’ll indulge me, what is it about my earlier post that you didn’t agree with? I think my research, done before the device was made available, was quite fair and through. But, also in fairness, as my impressions improved, I felt it warranted a follow-up once I learned more.

      I also need to ask what the job responsibilities are of a “professional lurker of blogs”. Do you evaluate overall sentiment towards your company (or your client’s company)? Is it for market-research? investments? Without elaborating, this brings into question your motive behind your comment, and whether your emphatic endorsement is genuine or somehow profit-motivated. I hope it’s just true, unbridled enthusiasm, but I’m not so sure.

      Finally, thanks for not resorting to name-calling as you say you had considered. That would surely have been a black mark on this otherwise respectful, respectable community.


  6. I have one of those mophie chargers. It has a micro-USB and a USB outlet on it and I have used it to charge phones and my iPad. Looks like I can also use it to charge the t:slim if I end up getting one when my MedT warranty is up, just grab my micro-USB to USB if I’m not sitting at my computer. I like the rechargable battery though because changing the battery on the MedT is a pain for me. The battery cap frequently gets stuck and I don’t own a screwdriver still.


  7. Your problem with being able to work the pump without looking at the buttons doesn’t make sense to me. You claim that is do to with not seeing them in the dark. However, the tslim’s screen lights up, so you can see everything inthe dark. And much of your other complaints I commented on in your previous post. But cgm integration is soon to be released, the pump is smallerthan phones and most other pumps, so it is mostly a one handed operation, and the appearance of air bubbles in tubing should only be due to user error. Plenty of your complaints aren’t actually present, and perhaps your inpur would be more reliable and acdurate after you had actually even seen the pump in real life.


  8. Hi,scott,I like enjoy reading your blog,it’s positive and informative. I have been using medtronic since I was 15,you got it exactly when you said: Medtronic is like microsoft,one amazing thing for the next seven years. I’m very interested in the t-slim as well,my warranty for my 530g isn’t for 2 years so until then please post any knew information about the t-slim. I have the CGM along with my pump, the point difference between what it estimates my sugars to be and what my blood sugars actually are has made it almost impossible work out. Example,: I went to the mall (before I go driving I check my blood sugars)everything was ok to go. Midway to my destination I looked at my pump to see where my blood sugars were drifting at,it read”238″(knowing the 40 point difference ratio)I felt good. I walk to meet my husband,we get something to eat and I prepared to check my sugars. Now ,I failed to mention that it takes me no less than 35 minutes to get to the mall (I would like to establish a time frame). My sugars at this point are 68,I get less than a unit of basal insulin an hour,(I would of had to of taken 5 or less units of insulin before leaving the house for my blood sugars to drop so drastically ,plus, it would have to have been at least one hour and a half before most the insulin would of taken effect). My CGM has done this before,it has been more than 40 points off,and in addition to this whole shebang I don’t get any symptoms of low blood sugar anymore. I thought this would really help with my low blood sugars,I’ve had a lot of seizures during my 17 years of diabetes. Despite this I’m very interested in trying anything that will make my life easier to run. I had the CGM replaced with same result, I tried to work with my doctor,I also call Medtronic to talk with there technical support but it didn’t improve. I’m eager to here from those who I experiencing the same,or those who have an idea.


  1. Pingback: I’m not getting a t:slim « Rolling in the D

  2. Pingback: Choosing a New Insulin Pump: Decision Made : DiabetesMine: the all things diabetes blog


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