Medical Team Performing Operation on Patient

Building life-saving medical technology requires quality precision springs. John Evans’ Sons is proud to manufacture custom springs and components that meet the highest standards for medical device manufacturers.

We offer several counterbalancing options to assist and/or enhance articulated instruments for medical or dental equipment design, including constant force springs, spiral torsion springs, and power springs. These offer significant benefits compared to gas springs.

constant force springs mounted on plastic drums

Constant force springs
Constant force springs provide a smooth range of motion and a constant load in either extending or retracting direction. This spring design has no inertia to overcome when considering the initial position forces. Constant force springs are compact and mount easily to existing hardware. These types of springs can eliminate the need for costly and complicated motors, thus decreasing device size and cost.

Spiral torsion springs

Spiral torsion springs
Spiral torsion springs are normally used in applications requiring less than 360 degrees of rotation. They are generally used to obtain a large amount of torque through a small amount of rotation. Spiral torsion springs allow for rotation in two directions and a “return to center” capability, like a dental X-ray head unit. Use spiral torsion springs when you need a spring that easily mounts to many designs.

Power Springs

Power springs
Power springs, also known as clock springs, are constructed by winding a strip of spring-tempered material on an arbor in a circular case (keeper). The spring stores rotational energy by being stressed when wound around the arbor. The spring delivers rotational energy to the arbor when it rotates, by expanding to the maximum curvature allowed by the keeper.

spring and assembled components for a turn key assy.

Custom mechanical assemblies
Spring sub-assemblies may call for the use of components consisting of a variety of materials (molded plastic, machined metal, rubber). In addition to manufacturing of the springs JES has the capabilities and capacity to assemble springs and various customer designated or customer supplied additional parts into a completed sub-assembly.

Medical Applications

Our components are frequently used in the following medical applications and devices:

  • Surgical robots
  • Table and bed lift mechanisms
  • Computer monitors in fixed and mobile applications
  • MRI and X-ray devices
  • Dental X-Ray equipment with articulated arms
  • Medical equipment drawer closing mechanisms
  • Surgical staple devices

Have questions about custom springs for your medical device? Whether you need a component for an application listed above or a proprietary device, our technical team  is here to help.

Your Medical Manufacturing Partner

The John Evans’ Sons Engineering Department looks forward to discussing your spring requirements including any device or equipment challenges. We are here to help ensure your design specifications are accurate and complete, reducing research and development costs and lead time. Oftentimes, one of our standard stock springs will work for your assembly eliminating the need for a custom spring and offering a faster solution. Our sales department is ready to provide more information on John Evans’ Sons stock and custom springs.

Our quality assurance team tests at every stage of manufacturing to ensure customers’ requirements are met. Our inspection capabilities are world-class in the spring industry.

We provide outstanding customer service from development through manufacturing and shipment of your parts. We’re not just a spring manufacturer; we’re your partner.
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John Evans Medical Spring Mfg
Medical and dental counterbalance springs
JES Corp. Profile Download .pdf
JES Corp. Profile

for Medical Designers

Spring Products Download .pdf
Spring Products

for Medical Designers

Constant Force Springs Download .pdf
Constant Force Springs

for Medical Designers

Constant Force Selection Chart Download .pdf
Constant Force Selection Chart

for Medical Designers

Enclosed Reels Download .pdf
Enclosed Reels

for Medical Designers

Large Reels Info Download .pdf
Large Reels Info

& Selection Chart for Medical Designers

Vibration Isolator Intro Download .pdf
Vibration Isolator Intro

for Medical Designers

Need Assistance? Consult our Technical Team.

Our Technical Team offer a depth of expertise to assist you with all parts of the process. We are ready to answer your questions in a timely manner and will help you define what you need. We produce custom springs for all purposes, and we are here to work with you on any of your customization needs.