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Development of a New High-Performance Autoinjector

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Development of a New High-Performance Autoinjector Midas / Springboard DEVELOPMENT OF A NEW HIGH-PERFORMANCE AUTOINJECTOR In this article, Tom Oakley, Director of Drug Delivery Device Development at Springboard, and Sigrid Saaler-Reinhardt, PhD, Director of Corporate Project Management at Midas Pharma, discuss the development of the Midas Pharma’s NIS cartridge-based autoinjector. Prefilled syringes have become the standard “Standard” autoinjectors, which are based Tom Oakley Director of Drug Delivery format for delivering new biologic drugs. on a compression spring pushing on the Device Development However, they suffer from various issues, plunger of a prefilled syringe, can solve the T: +44 1223 607450 such as: first three issues. But the fourth issue is a E: [email protected] growing challenge for standard autoinjectors 1 People do not like seeing needles. because certain biologics – notably monoclonal Springboard Pro Ltd 2 There is a risk of contamination and antibodies – need to be administered St John’s Innovation Centre injury via needlesticks. in high concentration for subcutaneous Cowley Road 3 They can be unsuitable for self-injection by self-administration. This can lead to an Cambridge people with hand tremors or dexterity issues increased viscosity of the formulation, which CB4 0WS United Kingdom from rheumatoid arthritis and suchlike. requires greater spring force. 4 The force required to deliver viscous Most autoinjector designs hold the www.springboard.pro drug formulations through an acceptably plunger rod back away from the plunger thin needle could be too high either for when the device is in storage. When the user or for the syringe. the device is triggered, the plunger rod 5 The drug formulation can interact with accelerates forward rapidly until it impacts the silicone lubricant, the steel needle, the plunger and creates shock through the adhesive used to attach the needle the system which can break the syringe. or the tungsten used to form the hole Another source of impact is where some for the needle. device designs insert the needle into the Syringe Cartridge Prof Dr Sigrid Saaler-Reinhardt Director of Corporate ✘ Limited volume ✔ Volume limited only by length Project Management ✘ Fragile flange and shoulder ✔ No flange, and a strong shoulder T: +49 61 329 90 194 ✘ Tungsten and adhesive ✔ No tungsten or adhesive E: sigrid.saaler-reinhardt around needle around needle @midas-pharma.com ✘ “Wet” needle in storage ✔ No needle contact in storage ✘ Sprayed-on silicone oil ✔ Baked-on silicone oil Midas Pharma GmbH Rheinstraße 49 ✔ Used in early clinical trials ✘ Not typically used in early 55218 Ingelheim clinical trials Germany Table 1: Comparison of syringes and cartridges. www.midas-pharma.com 14 www.ondrugdelivery.com Copyright © 2020 Frederick Furness Publishing Ltd Midas / Springboard patient using the main power spring. cartridges do not have the flange seen on This can accelerate the syringe forward syringes. The main differences relevant to at high speed and cause impact when the this discussion are summarised in Table 1. syringe is decelerated again. Cartridges are not typically used in early There are some innovative devices clinical trials for many new biologics, such tackling these problems – such as the Oval as monoclonal antibodies. However, they Medical (Cambridge, UK) ArQ-Bios, which could be used by either fitting an adapter uses a custom primary drug container, or to add a needle and plunger rod or by using the Consort Medical (Hemel Hempstead, the autoinjector that we will introduce in UK) Syrina AS, which uses a liquified gas this article. propellant in place of a spring. Both have their merits but require the pharmaceutical WHY PRESSURISE THE company to support either a non-standard DRUG IN STORAGE? primary drug container or a non-standard power source, respectively. Most spring-powered devices cause Another way to manage the increasing an impact when the spring is released. viscosity is to dilute the formulation back This could be avoided entirely if the spring to a more reasonable viscosity and deliver was already pushing on the plunger, thus a larger-volume injection. Several platform pressurising the drug during storage. autoinjectors are now available in 2.25 mL The advantages of this approach are: syringe formats. However, the change from the 1 mL to the 2.25 mL syringe formats • Impact is avoided, so stronger springs tends to require substantial changes to the can be used without risk of impact device. Changing the computer-aided design breakage, which in turn means that (CAD) models and manufacturing a new set higher viscosity and/or larger volumes of tools for almost all components entails an can be delivered through a given increased risk, time delay and cost. Further, needle diameter. in general, they cannot support injections • Air bubbles have been shown to cause greater than 2.25 mL. degradation of proteins (Christian There is, therefore, the need for a new Dechant, SMi Prefilled Syringes Europe autoinjector which: Conference, London, UK, January 17-18, 2018). When the drug formulation • Avoids the problems associated with is pressurised in storage, air tends to prefilled syringes (drug interaction, dissolve into the solution. In addition, any Figure 1: 3 mL NIS autoinjector. limited volume, etc) remaining bubbles are compressed, thus • Uses a standard primary container that is reducing their surface area available for different effect with longer duration. In fact, already widely used widely for injections interaction with the drug formulation. the reduction in bubble number and volume • Uses well-proven components (springs, • The plunger does not move when discussed above should reduce degradation. needles, packaging, etc) that are already ambient air pressure is changed, for derisked and low cost example during air freight. THE NIS AUTOINJECTOR • Can deliver higher volumes and/or • The triggering mechanism can be very viscosity than other low-risk autoinjectors. simple and completely independent of the The NIS autoinjector from Midas Pharma rear end of the autoinjector. The injection (Figure 1) is a cartridge-based autoinjector WHY USE A CARTRIDGE can be started by inserting a needle wherein the spring is always pushing on the IN AN AUTOINJECTOR? through the cartridge’s septum seal. plunger. The simplicity of the NIS design (Figure 2) means that: Pharmaceutical cartridges are widely used But could storage under pressure damage to deliver drugs such as insulin, fertility the drug? Testing at a pharma company has • A 1.5 mL or 3 mL cartridge can be used hormones and growth hormone. They shown that there has been no degradation in with only minor changes. For example, differ from the staked-needle syringe in their drug when stored at maximum pressure the same tool could be used for the that cartridges have an elastomeric septum over the three-month period studied. There main body, which is unique amongst seal at one end rather than a needle. Also, is no reason to believe there will be a autoinjectors. Figure 2: Section view of NIS autoinjector. Copyright © 2020 Frederick Furness Publishing Ltd www.ondrugdelivery.com 15 Midas / Springboard • For a given cartridge diameter, a change in drug volume or viscosity needs only a change in the spring and plunger rod length. Figure 3 shows two use steps for the NIS autoinjector. However, the design is so simple that it is even possible to do away with the step of removing a cap, which would make the NIS autoinjector the first “one-step” autoinjector on the market. HOW CAN WE PREDICT AUTOINJECTOR PERFORMANCE? Our primary considerations are that the autoinjector should: • Be safe – which means, for example, a low chance of breakage or underdose. • Deliver the drug through a thin needle in a reasonable time. Figure 3: Use steps for NIS autoinjector. In order to answer the second point, we Where Q is flow rate, π = 3.141, ΔP HOW DOES THE NIS AUTOINJECTOR would like to know the maximum viscosity is the pressure drop, d is the needle inner COMPARE WITH COMPETITORS? each autoinjector design can deliver through diameter, μ is the dynamic viscosity, L is the a given needle gauge in the maximum needle length, t is the injection time, V is the We could use the equation above to allowable injection time limit. The injection drug volume, D is the syringe inner diameter calculate the maximum viscosity which time is dominated by the drug formulation and F is the force on the drug (which is each autoinjector can inject in a given being pushed through the needle. Flow spring force minus any friction). time through a given needle diameter – through the needle is governed by the Figure 4 shows the correlation between but that would assume that every parameter Hagen-Poiseuille equation: measured injection time and predicted was at its mean value and would take no injection time for an example autoinjector account of variation. Also, we want all filled with calibrated 50 cP silicone oil, with injections to be under a given time limit an extra thin needle and weak spring to give – so we care about the slowest injections, Rearranging to calculate injection time gives: greater injection time than the real device. The not the mean. We need to calculate the difference between measured and predicted distribution of injection times. injection time is not more than 1.5% so the We could use algebraic manipulation but model is good enough for our purposes. this is challenging and would become very challenging if any of the input distributions were not Gaussian. Instead, we can use a Monte Carlo simulation. For those who are not familiar with this method, the steps are: 1. Model the distribution of each input to the equation (drug volume, needle diameter, etc). 2. Take one sample at random from each input distribution. “The NIS autoinjector could inject significantly higher-viscosity drugs than competitor devices.” Figure 4: Actual injection times versus predicted injection times.
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