Citation: Shaked T, “Meeting the Need for High-Volume Drug Delivery with On-Body Bolus Injectors. ONdrugDelivery, Issue 111 (September 2020), pp 26–28.

Tsachi Shaked shows how on-body injectors present a safe and viable solution for high-volume drug delivery.

“An on-body injector that can deliver high-volumes and viscous drugs slowly over a predetermined period ensures easy handling, safety, reduced pain and leak-free delivery and represents a viable alternative to autoinjectors.”

As the covid-19 crisis continues, many regular hospital visits and scheduled surgeries have been cancelled or put on hold, due to concerns about over-burdened hospital resources as well as fear of infection. Many mandatory hospital visits can be eliminated with the use of an on-body bolus injector which can handle drug volumes of 3 mL and over.

An established player in the injectable medications market, Elcam Drug Delivery Devices (E3D) is working to create on-body delivery devices for subcutaneous or intramuscular delivery of medications outside a clinical environment. Creating a convenient bolus injector for home use spares patients a tiring hospital trip. Instead, they can rest comfortably at home while the on-body injector does its job (Figure 1). As healthcare resources are stretched increasingly thinly, it can provide welcome relief by providing a cost-effective alternative to outpatient treatment.

Figure 1: E3D’s on-body injector for home care use.


For self-administration, the rule of thumb for the length of time a patient can hold an autoinjector is 15 seconds. Because injections of 3 mL and more can take longer than 15 seconds, using a self-administered injection means longer holding time. With much higher volumes, subcutaneous tissue is limited in its ability to handle the fast injection of large volumes – and injecting large volumes can result in the drug leaking as well as causing the patient unnecessary pain. An on-body injector that can deliver high-volumes and viscous drugs slowly over a predetermined period ensures easy handling, safety, reduced pain and leak-free delivery and represents a viable alternative to autoinjectors.

Figure 2: OBI 5 mL.

E3D’s on-body bolus injector (OBI) (Figure 2) delivers bolus subcutaneous injections at the desired injection time, as cost-effectively as possible and with minimal need for patient intervention. It provides automated drug delivery in the familiarity, comfort and convenience of the patient’s home, eliminating the risk of exposure to carriers of Covid-19 or other infectious diseases. It’s also likely to be well accepted by patients. Recent research has shown that patients are showing increasingly high satisfaction with self-administered antibiotics using antibiotic elastomeric pumps.1

Operating the OBI takes only four simple steps:

  1. Peel off liner
  2. Attach to skin at injection site
  3. Press button to start injection
  4. Peel off after injection completed.

Its key features are:

  • Sterile
  • Prefilled, preloaded and ready to use
  • Adjustable injection time
  • Variable injection volumes – from 3 mL to 40 mL
  • Audible and visual indications for injection start and end as well as injection progress
  • Full control of injection states
  • Needle safety – needle hidden at all times
  • Injection data transmission.

Because the smart injector device can be configured for wireless communication, full monitoring of comprehensive injection data can be made available – the physician is able to monitor the patient status through a mobile app, ensuring that the dosage was administered in full at the correct time.


“The OBI is another step in E3D’s quest to free patients from having to visit hospitals.”

While there is often a small learning curve with autoinjectors, E3D addressed the usability issue by replicating a user experience already introduced to market. The preloaded ready-to-use OBI devices are easy to use. Key features considered during the design process included:

  • User focused and ergonomic – the device can be easily applied to the patient’s skin because of its size.
  • Automated delivery – delivery of bolus injection (needle penetration) is automatically performed after being applied to the patient’s skin and pressing the injection button.
  • Stable attachment – device design and size ensure stable and safe attachment to the patient’s body that cannot be easily dislodged.
  • Simplified design – the device size has been reduced and the design simplified to enable cost-effective manufacture.


The OBI device technology platform (Figure 3) offers significant advantages in the delivery of other injectables, as it is cost effective, compact, light, inherently robust, economical and readily scalable for any dose volume. The OBI platform can easily be scaled to deliver a liquid bolus of up to 40 mL. During early drug lifecycle development, dosage volume is frequently high. As development progresses, pharma companies are able to increase concentration and reduce dose volume. Since the device is well suited to delivering high-volume viscous liquids, it addresses an increasingly prevalent requirement for a versatile platform to accommodate the needs of emerging drug products.

Figure 3: The OBI platform.


On-body injectors are set to represent an increasingly attractive alternative to handheld injector devices for higher dose volumes and viscous drugs. The compact, robust, flexible and cost-effective OBI platform can provide the required capabilities to meet the needs of specific drugs, therapies and patient populations, creating significant advantages for a broad range of drugs for a wide variety of indications including autoimmune conditions, oncology and multiple sclerosis.

Figure 4: E3D’s range of products.

Its versatility is set to provide significant added value to pharma companies seeking cost-effective on-body alternatives for large-volume and/or high-viscous drug applications. With more injectables requiring high dose volumes and with more of these drug products having elevated viscosities, on-body injector devices will have an increasingly important role to play in providing effective, safe and convenient patient care.

Most importantly, the OBI is another step in E3D’s quest to free patients from having to visit hospitals, especially as the impact of the coronavirus crisis continues to be felt the world over (Figure 4).


  1. Saillen L et al, “Patient satisfaction in an outpatient parenteral antimicrobial therapy (OPAT) unit practising predominantly self-administration of antibiotics with elastomeric pumps”. Eur J Clin Microbiol Infect Dis, 2017, Vol 36(8), pp 1387–1392.