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Heart of 29 Stethoscope Diaphragm


Heart of 29, a non-profit founded by legendary baseball Hall of Famer Rod Carew has teamed up with MDF® Instruments to create the Heart of 29 Stethoscope! Heart of 29's mission is to raise awareness and prevention of heart disease with assistance from the American Heart Association. The team spirit is alive and well as MDF Instruments is also donating to the American Heart Association.


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Stethoscope for Good

We've partnered with Heart of 29 (link to heart of 29 site on AHA website) to create the Rod Carew Heart of 29 Stethoscope. To get into the team spirit, MDF Instruments will also donating to the American Heart Association to support their efforts to build healthier lives free of cardiovascular disease and stroke!

Learn more about Heart of 29 here.

The Rod Carew Story

Rod Carew is one of the greatest hitters in MLB history, a seven-time American League batting champion and was inducted to the Baseball Hall of Fame in 1991. Most recently, in late 2015, Carew suffered a massive heart attack while on a golf course. Although Carew had just been given a clean bill of health shortly before his trip to the golf course, the Hall of Famer suffered a major heart attack on the course that day. Soon after, it dawned on Carew that heart problems can hit anyone at any time; this realization prompted him to reach out to the American Heart Association so that others could avoid the same fate. Carew partnered with the American Heart Association on Heart of 29, a campaign named for the jersey number he wore throughout his 19-year career with the Minnesota Twins and Anaheim Angels. The organization has since sought to raise awareness for heart disease and promotes heart health maintenance through heart walks, special baseball game nights, and awareness polos

Stand with Rod, Heart of 29, Minnesota Twins, and Los Angeles Angels

“Today, through a partnership between MDF Instruments, Heart of 29, and the American Heart Association, we are officially offering a signature “Heart of 29” stethoscope with MDF instruments for individuals and medical professionals across the country. These stethoscopes will provide everyone with the ability to know their hearts, listen to their hearts, and schedule doctoral appointments the second they hear irregularities. In reality, we all need to visit the doctor more frequently than we do, but for a lot of people, monthly appointments just don’t fit with their busy schedules. By having this stethoscope at home for heart monitoring, people now have the ability to watch their hearts before something catastrophic befalls them.”

Team Spirit

In collaboration with Heart of 29, MDF Instruments will also be making a contribution to the American Heart Association in support of AHA's programs to maintain healthy hearts!

Our Best-Selling MD One Stethoscope

"This is an outstanding value in medical equipment. I work as a PA in a large cardiology group where expertise in chest auscultation is absolutely integral to our work, and often skill is undermined by dysfunctional equipment.... This stethoscope does exactly what I need it to do with excellent precision, and though it may be less popular than its counterparts I find that it may not be only comparable but superior. I find the earpieces to be more comfortable and better at noise isolation. I can ear very clearly soft murmurs of aortic regurgitation or mitral stenosis (even though I usually have the benefit of an echocardiogram to confirm the findings!). Pericardial friction rubs, arterial bruits, the various splittings of S1 and S2, etc., are all easy to define and pick up. Rales are loud and clear. Both the bell and the diaphragm are very sensitive and clearly transduce the sound. I'm not going to keep listing the various auscultation findings that exist but you get the picture. I highly recommend this stethoscope as an alternative to the more popular "name-brand" products you frequently see around your healthcare setting but not as a budget conscious buy, rather a functionally superior product. If nothing else, it's waaaaaayy more simple and easy to use than a tunable diaphragm, which may in and of itself yield better auscultatory performance.” - Jack of All Trades

- Jack of All Trades, Amazon Reviewer

Included Accessories

2 extra sets ComfortSeal™ eartips, spare ultrasensitive diaphragm, and ID tag.

World Class

MDF Instruments uses materials that comply with all local regulations to ensure that all of our products are non-toxic, latex-free, non-phthalate, non-hazardous, etc. to both the medical and the patient communities.

Lifetime Warranty

By your side. For life. All MDF Instruments Stethoscopes include a Lifetime Warranty and Free-Parts-for-Life membership upon registration (register your product here). Our lifetime warranty covers all defects that may occur due to manufacturing and also includes tubing! Disclaimer: Because the Heart of 29 Diaphragm is a limited-edition print, it is NOT included with our Lifetime Warranty. All warranty and Free-Parts-for-Life requests will be fulfilled with the standard MDF Instruments logo diaphragm.

Yes, you heard it right. Free Parts For Life.

Free-Parts-for-Life is a unique program offered to all registered MDF customers. Once registered, you can order free replacement parts for your MDF Instruments stethoscope for 100% free to your home! Just register, request your parts via email or phone, and we’ll do the rest! To read the terms and conditions click here.

More Information
Color Aqua Green (OM)
In Stock Yes
Warranty Lifetime Warranty


With an insistence on quality and a constant focus on innovation, we strive to deliver first-class instruments that lead the industry in accuracy, safety, and cutting-edge design. Look for these patented features on our stethoscopes:

  • ErgonoMaxTM headset: Pat. No. ZL 200820155127.0
  • X-configuration tubing: Pat. No. ZL 200820151419.7
  • ProCardialTM C3 chestpiece: Pat. No. ZL 2011 2 0200178.2
  • SafetyLockTM eartip adaptors: Pat. No. ZL 201020279423.9
  • SoundTightTM GLS Acoustic Valve: Pat. No. ZL 201020279428.1
  • MDF® 740 Pulse TimeTM with timepiece: Pat. No. ZL 201030027143.4
  • Lightweight ProCardial-ERATM chestpiece with dual output valve:


Accuracy is a constant focus in the medical instrumentation arena. The quest to improve functionality, acoustic sensitivity, precision, and performance is a driving force at the heart of the industry. MDF® instruments is more keenly aware of this challenge than most, with research and innovation at the very core of our business, since this is the future of the medical instruments industry. We are always planning for the future—developing the technical solutions that will lead to the next generation of instruments for improved diagnosis and wellness.


MDF® Instruments stethoscopes have been handcrafted in the MDF® artisan tradition since 1971. They are super-duty, high-performance medical tools that meet the toughest requirements of precision and accuracy.


We are insistent on delivering first-class instruments, because quality is the key to all that is significant in our line of work. From conception through the final stage of assembly, our crafters' hands and traditional tools are supplemented by advanced technology. Each instruments is handcrafted and rigorously examined under the stringent scrutiny of state-of-the-art quality mechanisms. But regardless of the latest quality control systems we employ, before each instruments receives the MDF® Seal of Quality, we simply ask ourselves: *Is this good enough for my family?*


MDF® instruments are super-duty, high-performance medical tools that meet the toughest requirements of precision and accuracy. We apply advanced technological developments and use the best materials for our instruments. Our designers and engineers couple the latest technologies with a unique working process to foster a traditional yet innovative approach. We select both conventional and avant garde materials to ensure durability and reliability. Our instruments are immediately recognizable as simple yet distinctive—a unique combination of functionality and performance.


Designed to satisfy the senses, MDF® instruments are sleek in design and truly functional—the hallmarks of MDF® creations. Our instruments are distinctive, with classical roots and modern touches. In everything from the individual components to colors selections, MDF® believes in innovation and aesthetics that translate a strong identity of design and style. These distinctive characteristics contribute to the functionality and performance of our instruments.