AU2002300833B2 - Aqueous aerosol preparations containing biologically active macromolecules and method for producing the corresponding aerosols - Google Patents

Description

8-02;16:51 7/

AUSTRALIA

PATENTS ACT 1990 DIVISIONAL APPLICATION NAME OF APPLICANT: Boehringer Ingelheim Pharma KG ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Little Collins Street Melbourne, 3000.

INVENTION TITLE: "Aqueous aerosol preparations containing biologically active macromolecules and method for producing the corresponding aerosols" The following statement is a full description of this invention, including the best method of performing it known to us: Aqueous aerosol preparations containing biologically active macromolecules and C) process for producing the corresponding aerosols The invention relates to a process for producing aerosols for administration of proteins and other biologically active macromolecules by inhalation, as well as aqueous 00 preparations for producing such aerosols.

It has long been known to administer drugs in the form of inhalable aerosols.

Aerosols of this kind are used not only to treat respiratory disorders such as asthma but are also used when the lungs or the nasal mucous membranes are intended to act as an organ of absorption. Frequently, blood levels of the active substance are achieved which are high enough to treat diseases in other parts of the body. Inhalable aerosols may also be used as vaccines.

In practice, numerous methods are used for producing aerosols. Either suspensions or solutions of active substances are sprayed with the aid of propellant gases, or active substances in the form of rnicronised powders are fluidised in the air breathed in or, finally, aqueous solutions are atomised using nebulizers.

However, in the case of molecules of complex structure such as interferons, the nebulization of aqueous solutions can readily lead to a serious reduction in the activity of the active substance, presumably as the result of shear forces and heating. It is thought that the formation of less active protein aggregates, for example, plays a part in this process. In their article "Stability of recombinant consensus interferon to airjet and ultrasonic nebulization", J. Pharm. Sci. 84: 1210-1215 (1995), A.Y. Ip and colleagues described examples of the formation of interferon aggregates after ultrasound or jet nebulization, with the concomitant loss of the biological activity of the interferon. Even if the biomolecule (biologically active macromolecule) is not completely destroyed, the loss of activity described here is important as it constitutes a 8-02;16:51 9/ 2 fairly large consumption of the possibly expensive biomolecule and leads to inaccurate dosing of active substance per actuation. This reduction in activity of molecules of complex structure during the production of the aerosol is not restricted to interferons; it also occurs to a greater or lesser extent when other proteins for example Niven et al., Pharm. Res. 12: 53-59 (1995)) and biomolecules are made into aerosol form.

Apart from the industrial production of the aerosol which contains the biomolecule, a second step is needed to ensure that the biomolecules are absorbed into the lungs. The lung of an adult human presents a large surface area for absorption but also has a number of obstacles to the pulmonary absorption of biomolecules. After being breathed in through the nose or mouth, air together with the aerosol it carries passes into the trachea and then through smaller and smaller bronchi and bronchioles into the alveoli. The alveoli have a much larger surface area than the trachea, bronchi and bronchioles together. They are the main absorption zone, not only for oxygen but also for biologically active macromolecules. In order to pass from the air into the bloodstream, molecules have to cross the alveolar epithelium, the capillary epithelium and the lymph-containing interstitial space between these two layers of cells. This can be done through active or passive transport processes. The cells in these two layers of cells are arranged close together, so that the majority of large biological macromolecules (such as proteins) cross this barrier much more slowly than smaller molecules. The process of crossing the alveolar epithelium and capillary endothelium proceeds in competition with other biological processes which lead to the destruction of the biomolecule. The bronchoalveolar fluid contains exoproteases (cf. for example Wall D.A. and Lanutti, A.T. "High levels ofexopeptidase activity are present in rat and canine bronchoalveolar lavage fluid". Int. J. Pharm. 97: 171-181 (1993)). It also contains macrophages which eliminate protein particles by phagocytosis. These macrophages migrate to the base of the bronchial tree, from where they leave the lungs by means of the mucociliary clearance mechanism. They are then able to migrate into the lymphatic system. Moreover, the macrophages may be influenced in their physiology by the protein in aerosol form, e.g. interferons may activate alveolar macrophages. The migration of activated macrophages is another mechanism for propagating the systemic effect of an inhaled protein. The complexity of this process 30-04-'07 12:04 FROM- T-797 P007/024 F-504 ?:AOPEmPDBlSpm#02l;)M«33 25pa MS0-]4/W10 8 means that results of aerosol tests with one type of protein can only be transferred to o another type of protein to a limited degree. Small differences between interferons may, for nexample, have a significant effect on their susceptibility to the degradation mechanisms in the lungs (see Bocci et al. "Pulmonary catabolism of interferons: alveolar absorption of 125-I labelled human interferon alpha is accompanied by partial loss of biological activity" o (Antiviral Research 4: 211-220 (1984)).

0 N' Proteins and other biological macromolecules may indeed by nebulized in theory but as a 0 rule this nebulization is accompanied by a loss of activity. Advantageously one or more embodiments of the present invention may provide a process for producing inhalable aerosols by means of which biologically active macromolecules, particularly proteins, can be nebulized without any substantial loss of activity.

Accordingly, the present invention provides propellant-free nebuliser containing an aerosol preparation in the form of a solution with water or a water/ethanol mixture as solvent, which contains an active substance in a concentration between 25 and 100 mg/ml, which is selected from among: antisense oligonucleotides orexins arythropoictin tumour necrosis factor-alpha tumour necrosis factor-beta GM-CSF (granulooyte-macrophago colony stimulating factor) annexin calcitonin leptins parathyrin parathyrin fragment intCrleulins insulin COMS ID No: SBMI-07169992 Received by IP Australia: Time 12:08 Date 2007-04-30 30-04-' 07 12:04 FROM- T-797 P008/024 F-504 -3Asuperoxide dismutase an interferon en soluble ICAM (intercellular adhesion wmolecule) somatostatin somatotropin 00 tPA (tissue plasminogen activator) TNK-tPA c N tumour-associated antigens (as peptide, protein or as DNA) peptide bradykinin antagonists urodilatin GHRH (growth hormone releasing hormone) CRF (corticotropin releasing fabctor) EMPA II heparin soluble intcrleukin receptors such as slL-I receptor vaccines such as hepatitis vaccine or measles vaccine antisense polynucleotides tiansription factors, wherein the propellant-free nebuliser is suitable for measuring a therapeutically active amount of a single does of the aerosol preparation in a measuring chamber and of spraying it under high pressure between 100 and 500 bar through at least one nozzle with a hydraulic diameter of 1 to 12 microns to form inhalable droplets of a medium particle size of less than 10 micrometer.

The invention also provides an aqueous preparation as described immediately above wherein the aqueous preparation is in the form suitable for administration to a human subject by inhalation of a propellant-free aerosol with an average particle size of less than 10 gm.

COMS ID No: SBMI-07169992 Received by IP Australia: Time 12:08 Date 2007-04-30 P \OPER\PDB\Speci 221(X)K33 I sp d.oc-SA) )9/ S-3B- SA new generation of propellant-free nebulizers is described in US Patent 5,497,944; t reference is hereby made to the contents of this patent. The particular advantage of the nebulizers described therein is that there is no need to use propellant gases, particularly fluorochloro hydrocarbons.

00 M A more developed embodiment of the nebulizers described therein is disclosed in SPCT/EP96/04351 WO 97/12687. Regarding the present invention, reference is Smade specifically to Figure 6 described therein (Respimat®) and to the associated parts of the description of this application. The nebulizer described therein can advantageously be used to produce the inhalable aerosols of biologically active macromolecules according to the invention. Thanks to its convenient size, this device can be carried around by the patient at all times. With the nebulizer described, active substance-containing solutions of specified volumes (preferably about 15 t-l) are sprayed under high pressure through small nozzles so as to form inhalable aerosols with an average particle size of between 3 and 10 microns. For the inhalation of insulin, nebulizers which are able to nebulize between 10 and 50 pl of aerosol preparation per application into inhalable droplets are suitable.

3 0- 8 -0 2 ;16:!5 1 /3 1 1 3 4 A feature which is of particular importance in the preparation of the aerosols according to the invention is the use of the nebulizer described in the above mentioned patent or patent application for the propellant-free atomnisation of solutions of active Substance which Contain proteins or other biologically active macromolecules.

Essentially, the conovenicntly sized atomniser disclosed therein (nebulizer, about 10 cm in size) consists of an upper housing part, a pump housing, a nozzle, a clamping mechanism, a spring housing, a spring and a reservoir container, characterised by a pump housing fixed in the upper housing part and bearing at one end a nozzle member 'with the nozzle or nozzle arrangement, -a hollow piston with valve member, -a drive flange in which the hollow piston is fixed and which is located in the upper housing part, a clamping mechanism located in the upper housing part, a spring housing with the spring located therein, which is rotatably mounted by a rotary bearing on the upper housing part, a lower housing part which is fitted on the spring housing in the axial direction.

The hollow piston with valve member WO 97/12687 corresponds to one of the devices disclosed. It projects partly into the cylinder of the pump housing and is mounted so as to be axially movably within the cylinder. Reference is made particularly to Figures 1 to 4, especially Figure 3, and the associated parts of the specification. The hollow piston with valve member exerts a pressure of 5-60 Milk (about 50-600 bar), preferably 10-60 MPa (about 100-600 bar) on the fluid, the 3 0- 8 02 ;1 :5 1 12/ 3 appropriate solution of active substance. on its high pressure side at the tin-ne of release of the spring.

The valve member is preferably mounted on the end of the hollow piston facing the nozzle member.

The nozzle in the nozzle member is preferably microstructured, i.e. produced by microtechnology. Microstnictured nozzle members are disclosed, for example, in WO-94/o76 07; reference is hereby made to the contents of this specification.

The nozzle member consists, for example, of two plates of glass and/or silicon firmly attached to each other, at least one plate of which has one or more microstructured channels which connect the inlet side of the nozzle to the outlet side. On the outlet side of the nozzle is provided at least one round or non-round opening smaller than or equal to 10 microns.

The directions of flow of the nozzles in the nozzle member may run parallel to one another or be inclined relative to one another- In the case of a nozzle member having at least two nozzle openings on the outlet side, the directions of flow may be inclined at an angle of 20-1601 to one another, preferably at an angle of from 60-1 50g. The directions of flow meet in the vicinity of the nozzle openings.

The clamping mechanism contains a spring, preferably a cylindrical helical compression spring, as a store of mechanical energy. The spring acts on the_ drive flange as ajumping member, the movement of which is determined by the position of a locking member. The path of the drive flange is precisely bounded by an upper and a lower stop. The spring is preferably put under tension, via a force-transtnitting gear, e.g. a helical thrust cam, by an external torque which is produced as the upper part of the housing is rotated counter to the spring housing in the lower housing part. In this case, the upper housing part and the drive flange contains a single- or mnulti speed wedge gear- 3 0- 8 02:;16!5 1 3/3 13/ 3 6 The locking member with engaging locking surfaces is arranged in an annular configuration around the drive flange- lit consists, for example, of a plastics or metal ring which has intrinsic radial elastic deformability. The ring is arranged in a plane at right angles to the atomiser axis. After the tensioning of the spring the locking, surfaces of the locking member slide into the path of the drive flange and prevent the spring from being released. T'he locking member is actuated by means of a button.

The actuating button is connected or coupled to the locking member. Inu order to actuate the locking mechanism the actuating button is pushed parallel to the plane of the ring, preferably into the atomiser; the deforruable ring is thus deformed in the plane of the ring. Details of the locking values are described in WO 97/20590.

The lower housing part is pushed axially over the spring housing and covers the bearing, the drive of the spindle and the reservoir container for the fluid.

When the atomiser is operated, the upper housing pant is rotated counter to the lower housing part, whilst the lower housing part takes the spring housing with it- The spring is compressed and biased by means of the helical thrust camn and the locking mechanism engages automatically. The angle of rotation is preferably a wholenumber fraction of 360*, e.g. 1800. At the same time as the spring is biased, the drive member in the upper housing part is moved a given distance, the hollow piston is pulled back within the cylinder in the pump housing, as a result of which some of' the fluid firm the reservoir container is sucked into the high pressure chamber in front of the nozzle.

If the desired, a plurality of exchangeable reservoir containers containing the fluid to be atomised may be inserted into the atomniser and used. The reservoir container contains the aqueous aerosol preparation according to the invention.

The atomnising process is started by gently pressing the actuating button. The locking mechanism then opens up the way for the drive member. The biased spring pushes the piston into the cylinder of the pump housing. The fluid leaves the atomiser nozzle in spray form.

8-02;16:*51; 14/ 3 7 Other details Of Construction are disclosed in POT applications WO) 97/1 2683 and Wo 97/2O59o,- reference is hereby made to the contents of these poublic-ations.

The components of the atomiser (nebulizer) are made of a material suitable for the purpose. The housing of the atomiser and as far as its operation permits other parts are preferably made of plastics, e.g. by injection moulding. For medical purposes, physiologically acceptable materials are used.

The atomniser described in WO 97112687 is used, for example, for propellant-free production of medicinal aerosols. An inhalable aerosol with an average droplet size of about 5 pum can be produced therewith.

Figures 4 a/h, which are identical to Figures 6 a/b in WO 97/1268 7, show the nebulizer (Respimnat®) with which the aqueous aerosol preparations according to the invention made advantageously be inhaled.

Figure 4a shows a longitudinal section through the atomiser with the spring biased, Figure 4b shows a longitudinal section through the atomiser with tihe spring released.

The upper housing part (5 1) contains the pump housing (52) on the end of which is mounted the holder (53) for the atomiser nozzle. In the holder are located the noZZle member (54) and a filter The hollow piston (57) secured in the drive flange (56) of the clamping mechanism projects partly into the cylinder of the pumip housing. At its end, the hollow piston carries the valve member The hollow piston is sealed off by mneans of the seal Inside the upper housing part is the stop (60) on which the dnive flange rests when the spring is released, On the drive flange is the stop (61) on which the flange rests when the spring is biased. After the spring has been biased, the locking member (62) moves between the stop (61) and a support (63) in the upper housing part. The actuating button (64) is connected to the locking member. The upper housing part ends in the mouth piece (65) and is closed off by means of the removable protective cover (66).

#15/ 8-02 16:51 5/ 8 The spring housing (67) with compression spring (68) is rotatably mounted by means of the snap-fit lugs (69) and rotary bearings on the upper housing part. The lower housing part (70) is pushed over the spring housing. Inside the spring housing is located the exchangeable reservoir container (71) for the fluid (72) which is to be atomised. The reservoir container is closed off by means of the stopper (73) through which the hollow piston projects into the storage container and dips its ends into the fluid (supply of active substance solution).

The spindle (74) for the mechanical counter is mounted in the outer surface of the spring housing. On the end of the spindle facing the upper housing part is the drive pinion The slider (76) rests on the spindle.

The nebulizer described above is suitable for nebulizing the aerosol preparations according to the invention to produce an aerosol suitable for inhalation.

The effectiveness of a nebuliser can be tested using an in vitro system in which a protein solution is nebulised and the spray mist is caught in a so-called 'trap' (see Fig.

The activity of the protein in the aerosol reservoir is compared with its activity in the trapped liquid e.g. by means of an immunoassay or using an assay for the biological effectiveness of the protein. This experiment makes it possible to evaluate the degree of destruction of the protein by the nebulising process. A second parameter of the aerosol quality is the so-called inhalable proportion, which is defined here as the proportion of the mist droplets with a measured median aero-dynamic diameter (MMAD) of less than 5.8 Am. The inhalable proportion can be measured using anp "Andersen Impactor". For good protein absorption it is important not only to achieve nebulisation without any substantial loss of activity but also to generate an aerosol with a good inhalable proportion (about Aerosols with an MMAD of less than 5.8 in are significantly better suited to reaching tie alveoli, where their chances of being absorbed are significantly greater. The effectiveness of a nebulisation device can also be tested in an in vivo system; in this case factors such as susceptibility to lung proteases come into play. As an example of an in vivo test system, a proteincontaining mist can be administered to a dog through a tracheal tube. Blood samples P c IspA dm4V59 W06 Q -9are taken at suitable time intervals and the protein level in the plasma is then 0 measured by immunological or biological methods.

SSuitable nebulisers are described in US patent 5,497,944 mentioned above and in WO 00 S97/12687, particularly as described in Figures 6 a/b (now 4 A preferred nozzle c arrangement for nebulising the aqueous aerosol preparations of biologically active Smacromolecules according to the invention is shown in Figure 8 of the US patent.

Surprisingly, it has been found that the propellant-free nebuliser described above which sprays a predetermined quantity e.g. 15 pi of an aerosol preparation under high pressure of between 100 and 500 bar through at least 1 nozzle with a hydraulic diameter of 1-12 .im so as to produce inhalable droplets with an average particle size of less than 10 p.m, is suitable for nebulising liquid aerosol preparations of proteins and other macromolecules, since it is able to nebulise a broad range of proteins without any appreciable loss of activity. The effective quantity of a single dose is between 10 and 20 pl. A nozzle arrangement as shown in Figure 8 of the above-mentioned US patent is preferred. What is particularly surprising is the ability of nebulisers of this type to nebulise interferons which can otherwise only be nebulised with considerable loss of activity. The particularly high activity of Interferon Omega after nebulisation with this device is also surprising, not only in in vitro tests but also in in vivo tests.

Another advantage of the process claimed is its surprising ability to nebulise even highly concentrated solutions of biologically active macromolecules without any substantial loss of activity. The use of highly concentrated solutions makes it possible to use a device which is small enough to be carried comfortably at all times in a jacket pocket or handbag. The nebuliser disclosed in Figure 4 satisfies these requirements and can be used to nebulise highly concentrated solutions of biologically active molecules.

30-04-t07 12:04 FROM- T77P0/2 -0 T-797 P009/024 F-504 8 For example, devices of this kind are particularly suitable for enabling diabetics to treat o themselves with insulin by inhalation. Preferably, highly concentrated aqueous solutions with a concentration of 20 to 90 mg/mI of insulin are used; solutions containing 33 to mg/mi of insulin are preferred and solutions containing 33 to 40 mg/ml of insulin are particularly preferred. Depending on the size of the reservoir available in the nebuliser, o0 solutions containing insulin in a concentration of more than 25 mg/mi, preferably more en than 30 ing/mi, are suitable for inhaling a therapeutically effective quantity of insulin with o a band-held device such as the device described above. The administration of insulin by o inhalation allows the active substance to start acting quickly so that the patient can treat themselves with the amount they require shortly before meal times, for example. The small size of the Respixat, for example, makes it possible for the patient to carry the device at all times.

The Respimnat (Figure 6 in WO 97/12687) has a dosing chamber of constant volume which enables the patient to determine and inhale the dosage of insulin which they require by the number of puffs. Apart from the number of puffs, the metering of the insulin is determined by the concentration of the insulin solution in the reservoir container It may be, for example, between 25 and 90 mg/mi, with more highly concentrated solutions of about 30 mg/mi upwards being preferred.

A process for preparing highly concentrated stable insulin solutions is described for example in WO applications 83/00288 (PCTIDKS2OOO6S) and 83/03054 (PCT/DK83/00024). to which reference is hereby made.

Aerosol preparations according to the invention which contain insulin administered by the device described above should not exceed a dynamic viscosity of more than 1600. 1 06 Pas to ensure that the inhalable proportion of the spray produced does not fall below an acceptable level. Insulin solutions with a limiting viscosity number of up to 1200. 10.6, and most preferably up to 1100. 10-6 Pa s (Pascal seconds) are preferred. If necessary, instead of using water as solvent it is possible to use solvent mixtures in order to reduce the COMS ID No: SBMI-07169992 Received by IP Australia: Time 12:08 Date 2007-04-30 30-04-' 07 12:04 FROM- T77 P1/2 -0 T-797 P010/024 F-504 S mAviscosity of the medicament solution. This can be done for example by adding ethanol.

o The amount of ethanol in the aqueous formulation may be up to 50%, for example; an en amount of 30% is preferred.

en 5 The aerosol preparation preferably has a viscosity of up to 1600. IYPa s, a range from o0 900 to 1100. 10'6 Pa a being particularly preferred.

Also preferred are aerosol preparations the aqueous solutions of which have a viscosity of between 900 and 1600. I0-6 Pa s, of which aqueous solutions with a viscosity in the range from 950 to 1300. 10f 6 Pa c are particularly preferred.

Advantageously, one or more embodiments of the invention may provide a suitable aerosol preparation which is appropriate for use in the processes for preparing aerosols described herein.

COMS ID No: SBMI-071 69992 Received by IP Australia: Time 12:08 Date 2007-04-30 P \OPER\PDB\SpC( \2l0230011 Ispa d-O 5lO I 0-11- SIt has been found, surprisingly, that even higher viscosity solutions of macromolecules can be sprayed into inhalable droplets of suitable size using the processes described. This makes it possible to administer larger amounts of r active substance per application and thus increases the therapeutic effectiveness of 00 Smacromolecules in inhalation therapy.

Aqueous aerosol preparations containing macromolecules albumin) can be used up to a viscosity of 1600. 10.

6 Pa s (measured at 25 0 At a viscosity of 1500. 10 6 Pa s an inhalable proportion of 32% was still obtained.

Higher viscosity solutions of macromolecules with a viscosity of up to I 100.10.6 Pa s are preferred. With such solutions, an inhalable proportion of droplets containing an active substance of about 60% is obtained. The limiting viscosity numbers given were detected using an Ostwald viscosimeter using the method known from the literature.

For comparison, the viscosity of water is 894.10.6 Pa s (measured at 25 0

C).

In order to illustrate advantages of the process according to the invention, the following is a description of in vitro and in vivo tests with an interferon omega solution.

8-02:15±51 16 19/ 12 In vitro tegts with Resoimate anAd Interferon Omega The reservoir of a Respimat device was filled with a 5 mg/ml interferon omega solution (formulated in 50 mM trisodium citrate, 150 mM NaCI, pI- The device was activated and a volume of about 12.9 p1 (one puff) was nebulised in an air current of 28 I/min. The nebulised solution was caught in a trap (Fig. Interferon omega was measured in the reservoir solution and in the solution caught in the trap by immunological methods, using an ELISA, and biologically, by inhibiting the destruction of encephalo-myocarditis virus infected A549 cells. Immunological measurement of iiiterferon is relatively simple. Published tests with nebulised proteins are restricted in many cases to inmunological measurements. However, additional biological measurements are very important as they are a particularly sensitive and therapeutically relevant method of quantifying protein destruction. They do not always give the same results as physico-chernical or immunological methods because a molecule can lose its biological properties without any change in its bonding to antibodies.

In three experiments, 84%, 77% and 98%, of the immunologically identifiable interferon, based on the starting solution, were found in the trap solution Biological measurements with the same solutions gave results of 54%, 47% and 81% recovery of the biologically identifiable interferon in the trapped solution. This very high percentage shows that nebulisation with the Respimat device destroys only a relatively small amount of the activity of the interferon. The spray mist from a Respimat device as described above was also passed into an Andersen impactor by means of an air current (28 /min). The proportion of particles less than 5.8 gi in size ('inhalable proportion') was measured. The inhalable proportion corresponded to (immunological measurements). Proteins such as interferons are often formulated with human serum albumin in order to provide further protection for the sensitive interferons. A formulation as above but with additional human serum albumin was also tested. In three tests, 83%, 83% and 79%, again based on the starting solution, of the inmunologically identifiable interferon were found in the trap solution Biological measurements with the same solutions yielded 60%, 54% and 66% of the biologically active interferon in the trapped solution. The inhalable 8-02 16:51 20/ 13 proportion (immunological measurements) was 67%. In another set of tests, a concentrated interferon omega solution was poured into the reservoir of the Respimat device in a concentration of 53 mg/ml and then nebulised. In four tests, 100%, 68% and 72%, based on the starting solution, of the immunologically identifiable interferon were found in the trapped solution Biological measurements with the same solutions yielded 95%, 98%, 61% and 83% recovery of the biologically identifiable interferon in the trapped solution. This high recovery rate shows that the Respimat device can also be used to nebulise concentrated protein solutions without excessive losses of interferon activity.

In vivo tests with Respimat and Interferon Omega Interferon omega was administered by inhalation and intravenous route in separate experiments on the same dog. The blood levels of interferon were measured immunologically and biologically at different times. In addition, the neopterin level in the blood was measured. Neopterin is a marker for immune activation; it is released by macrophages after interferon stimulation [see Fuchs et al. 'Neopterin, biochemistry and clinical use as a marker for cellular immune reactions' Int. Arch. Allergy Appl.

Immunol. 101: 1-6 (1993)]. Measurement of the neopterin level serves to quantify interferon activity.

The administration of interferon to the dog was carried out under pentobarbital anaesthetic after previous basic sedation. The animal was intubated and subjected to artificial ventilation (volume-controlled respiration: volume per minute 4 1/min, rate breaths/min). A total of 20 puffs were delivered by the Respimat device. Each puff was given at the start of an inward breath. After the breathing in phase there were five seconds gap before breathing out. Before the next administration of interferon omega the animal was allowed to breathe for two breathing cycles without intervention. Blood for serum and heparin plasma was taken before the admipistration of interferon and at various times up to 14 days after the administration of interferon. Interferon omega was measured in heparin plasma by immunological methods using an ELISA and by biological methods by the inhibition of the destruction of encephalo-myocarditis virus infected A549 cells. Serum neopterin was 8-02:16:51 21/ 14 determined by immunology. Figure 2 shows the interferon omega levels measured after 20 puffs of interferon omega from the Rcspimat device, measured by immunological methods (Fig. 2a) and biological methods (Fig. 2b). Surprisingly, after administration by inhalation, a very high serum neopterin level was measured. In the test carried out in vitro the amount of solution delivered after one puff of the Respimat device corresponded to 12.8 mg/puff, on average. Consequently, it can be expected that about 1.28 mg of interferon will be delivered by 20 puffs of the Respimat using a 5 mg/ml solution. Neopterin measurements after the administration of this amount yielded significantly higher and longer lasting levels than neopterin measurements after intravenous administration of 0.32 mg of interferon. Fig. 3 shows this result. The high neopterin levels are evidence that the administration of interferon by the Respimat can lead to a good biological activity.

The advantages of the Respimat device for nebulising biologically active macromolecules is not restricted to interferon, as can be seen from a second example.

In vitro tests with Respimat® and Manganese Superoxide Dismutase The device for nebulising the test substance and the associated trap are as shown in Fig. 1. In this experiment, the reservoir of the Respimat device was filled with 3.3 mg/ml of manganese superoxide dismutase (MnSOD) in phosphate-buffered saline (PBS). The device was operated and a volume of about 13 l (one puff) was nebulised in an air current of 28 /min. The precise amount nebulised was determined gravimetrically (measurements in three succeeding tests: 12.8, 13.7 and 14.3 mg).

The nebulised solution was caught in a trap This trap contained 20 ml of PBS. In addition, 2 ml of 5% bovine serum albumin was added to stabilise proteins in the trap.

MnSOD was determined in the reservoir solution and in the solution caught in the trap, immunologically using an ELISA and enzymatically by the reduction in the quantity of superoxide after a xanthine/xanthine oxidase reaction. In three tests, 78%, 89% and 83% of the immunologically identifiable MnSOD of the nebulised solution were measured in the trapped solution There was no measurable loss in enzymatic activity after nebulisation. The inhalable proportion (immunological measurements) was 61%.

8-0218:51 22/ The following example describes the production of an aerosol preparation according to the invention containing insulin as active substance.

Preparation of the insulin solution and filling the nebuliser 175 mg of crystallised insulin (sodium salt) from cattle (corresponding to 4462.6 LU.

according to the manufacturers' information) were dissolved in 3.5 ml of sterile purified water (Seralpur water). Then 8.5 1 of m-cresol (corresponding to 8.65 rg) and 7.53 mg of phenol, dissolved in 100 pl of sterile purified water were added with gentle stirring. To this solution were added 365 g1 of a 5 mg/mil ZnCI 2 solution (corresponding to a proportion by weight of 0.5% zinc based on the quantity of insulin used) and the pH was adjusted to 7.4 with 0.2 N NaOH. The volume of the mixture was made up to 5 ml with sterile purified water and filtered through a sterile miliipore filter (pore size 0.22 pin). 4.5 ml of the aerosol preparation were transferred into the reservoir container (72, Fig. 4) of the nebuliser (Respimat). The container was closed off with a cap and the device was loaded with the container.

The aerosol preparation thus produced has a concentration of about 35 mg/ml of insulin, the viscosity of the solution being about 1020. 10 6 Pa s.

In vivo test with the Resimat@ and highly concentrated insulin solution The insulin was administered to the dog anaesthetised with pentobarbital after previously receiving basic sedation. The animal was intubated and ventilated as before. A total of six puffs of insulin solution were delivered from the Respimat device. Each puff was administered at the start of an inward breath. Between the breathing in phase and the breathing out phase there was a gap of 5 seconds. Before the next administration of insulin, two breath cycles were left with no intervention.

Blood was taken one hour before administration, at the same time as administration 8-02;16:51 23/ 16 and at various times thereafter over 8 hours. The blood glucose level was measured in the fresh blood using the method of Trasch, Koller and Tritscher (Klein. Chem. 969 [1984]) using a Refletron® device made by Boehringer Mannheim. Surprisingly, even with this highly concentrated insulin solution, good biological activity was obtained (lowering of blood glucose level after administration of insulin by inhalation). Fig. 5 illustrates this result.

The aqueous aerosol preparations according to the invention can if necessary contain other solvents such as ethanol in addition to the active substance and water. The quantity of ethanol is limited, as a function of the dissolving properties of the active substances, by the fact that the active substance can be precipitated out of the aerosol preparation at excessively high concentrations. Additives for stabilising the solution such as pharmacologically acceptable preservatives, e.g. ethanol, phenol, cresol or paraben, pharmacologically acceptable acids, basis or buffers for adjusting the pH or surfactants are also possible. Moreover, in order to stabilise the solution or improve the quality of the aerosol, it is possible to add a metal chelating agent such as EDTA.

In order to improve the solubility and/or stability of the active substance in the aerosol preparation, amino acids such as aspartic acid, glutamic acid and particularly prolene may be added.

In addition to interferons, superoxide dismitase and insulin, the preferred active substances in the pharmaceutical preparations according to the invention are as follows: antisense oligonuclcotides orexins erythropoetin tumor necrosis factor-alpha tumor necrosis factor-beta G-CSF (granulocyte colony stimulating factor) GM-CSF (granulocyte-macrophage colony stimulating factor) annexins calcitonin P OPERPDBSpmO2300831 t spa dm.S)9f106 Q-17leptins parathyrin parathyrin fragment C interleukins such as interleukin 2, interleukin 10, interleukin 12 00 soluble ICAM (intercellular adhesion molecule) somatostatin Ssomatotropin StPA (tissue plasminogen activator) TNK-tPA tumor-associated antigens (as peptide, protein or as DNA) peptide bradykinin antagonists urodilatin GHRH (growth hormone releasing hormone) CRF (corticotropin releasing factor) EMAP II heparin soluble interleukin receptors such as sIL-1 receptor vaccines such as hepatitis vaccine or measles vaccine antisense polynucleotides transcription factors The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

Claims (1)

1. 30-04-'07 12:04 FROM- T-797 P011/24 F-504 -18- (N THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: Propellant-ree nebuliser containing an aerosol preparation in the form of a 0c) solution with water or a water/ethanol mixture as solvent, which contains an active substance in a concentration between 25 and 100 mg/ml, which is selected from n ao1g: 00 o antisense oligonucleotides c 01=ins eryftroietin Ci tinour necrosis factor-alpha tumour necrosis factor-beta (M-CSF (grmuuloeytc-macrophagc colony stimulating factor) amexins IS calcitonin loptins pavaiyin paratlyrin fragment interleukins insulin superoxide dismutase an interferon soluble ICAM (interellular adhesion rolvwule) somatostatin aomalotropin tPA (tissue plauninoten activator) TNK-IFA twnour-suociated antigens (as peptide, protein or as DNA) peptide bradykinin antagonists urodilatin GURU (growth hormone releasing hormone) CR1 (corftcotropin releasing fitctor) COMS ID No: SBMI-07169992 Received by IP Australia: Time 12:08 Date 2007-04-30 30-04-'07 12:05 FROM- T-797 P012/024 F-504 -19- 0 0 C EMPA II heparin soluble interleudin receptors such as slL- I receptor Svaccines such as hepatitis vaccine or measles vaccine antisee polynucleotides n transcription factors, 00 o wherein the propellant-free nebuliser is suitable for measuring'a theraputically C- active amount of a single does of the aerosol preparation in a measuring chamber o 10 and of spraying it under high pressure between 100 and 500 bar through at least one nozzole with a hydraulic diameter of 1 to 12 microns to form inhalable droplets of a medium particle size of less than 10 micrometer. 2. Propellant-fiee nebuliser according to claim 1, wherein said interleukins comprise intlelukin 2, interleukin 10 and interleukin 12. 3. Propellant-free nobuliser according claim I, characteised in that the active substance is insulin. 4. Propellant-free nebuliser according to claim 3, characterised in that the active substance insulin is used in a concentration of 25 to 60 mg/ml. Propellnt-free nebuliser according to claim 3, characterised in that the active substance insulin is used in a concentration greater than 30 mg/mnl. 6. Propellant-free nebulisor according to claim 3, characterised in that the active substance insulin is used in a concentration of 30 to 60 mg/ml. 7. Propellant-free nebuliser according to claim 3, characterised in that the active substance insulin is used in a coricentration of 33 to 40 mg/mi. COMS ID No: SBMI-07169992 Received by IP Australia: Time 12:08 Date 2007-04-30 30-04-'07 12:05 FROM- T-797 P013/024 F-504 20 0 S. Propellant-free nebuliser according to claim 1, characterised in that the active substance is superoxide dismutase. 0 9, Propellant-free nebuliser according to claim 1, characterised in that the active substance is an interferon. 00 10. Propellant-free nebutiser according to claim 1, chamcterised in that the e active substance is an interferon omega. c o 10 11, Propellant-free nebuliser according to one of claims I to 10, characterised in that the aerosol preparation contains one or more adjuvants from the group comprising the suarface-active substances, such as surfactants, emulsifiers, stabilisers, permeation enhancers and/or preservatives, 12, Propellant-free nebuliser according to claims I to 11, characterised in that the aerosol prepration contains an amino acid. 13. Plopelant-free nobuliser according to claim 12, chamoterised in that the aerosol preparation contains proline, aspartic acid or lutmic acid which is suitable for improving the solubility or stability of the active substance. 14. Propellant-free nebuliser according to claim 1, characterised in that the aerosol preparation has a viscosity of up to 1600 x 10' Pa.s at 25"C, measured with an Oswald viscosimeter. Propellant-free nebutliser according to claim 1, characterised in that the aerosol preparation has a viscosity of between 900 x 10'6 and 1600 x 10 Pa.s at measured with an Oswald viscosimeter. 16. Propellant-free nabuliser according to claim 1, characterised in that the aerosol preparation has a viscosity of between 900 x 10 and 1100 x 10 4 Pas at measured with an Oswald viscosimeter. COMS ID No: SBMI-07169992 Received by IP Australia: Time 12:08 Date 2007-04-30 03-05-'07 15:03 FROM- T-853 P005/008 F-558 1-21- 0 0 ci 17. Propellant-free nebuliser according to claim 1, characterised in that the aerosol preparation has a viscosity of between 950 x 10. 6 and 1300 x 10 6 Pa.s at r 25°C, measured with an Oswald viscosimeter. S18. Propellant-free nebuliser according to claim 14 or 16, characterised in that 00 the active substance is superoxide dismutase. 0 0 en 19. Propellant-free nebuliser according to claim 14 or 16, characterised in that 0 10 the active substance is an interferon. 0 Propellant-free nebuliser according to claim 19, characterised in that the active substance is interferon omega. 21. Propellant-free nebuliser according to claim 14 or 16, characterised in that the active substance is insulin. 22. Propellant-free nebuliser according to one of claims 1 to 21, characterised in that the nebuliser is small enough to be carried constantly in a jacket pocket or handbag. 23. Propellant-free nebuliser according to one of claims 1 to 21, characterised in that the nebuliser has a nozzle body with two nozzles which are directed so that the two jets meet in such a way that the aerosol preparation is nebulised. COMS ID No: SBMI-07234058 Received by IP Australia: Time 15:04 Date 2007-05-03 03-05-'07 15:03 FROM- T83 P0/0 T-853 P006/008 F-558 P IOMERb*,SeMUWfl)oS JndoO/2 -22- 24. Propellant-free nebuliser according to any one of claims I to 23, substantially as here inbefore described. en 0 COMS ID No: SBMI-07234058 Received by IP Australia: Time 15:04 Date 2007-05-03