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EPO clarifies patentability of diagnostic methods

The Enlarged Board of Appeal (EBA) at the European Patent Office (EPO) issued a decision on 15 February 2010 in case G1/07. This case concerned the patentability of diagnostic methods which (in certain embodiments) involve an invasive intervention with the human or animal body.    

In this case, the claims are directed to MRI imaging methods in which polarized 129Xe gas is “delivered to a predetermined region of the patient’s body”. In particular, the claims encompass embodiments where the gas is delivered to the patient by inhalation, and also by way of direct injection into the heart.

Some EPO case law concludes that any invasive intervention with the human or animal body undertaken as part of a method of curative treatment or of diagnosis constitutes a "surgical method" and is therefore excluded from patentability under Article 53(c) EPC. However, the case law is not uniform on this issue and the Enlarged Board of Appeal were asked to clarify whether it is:

(a) the nature, or

(b) the purpose

of the "surgical step" which is relevant in determining whether or not it should be considered a method of treatment by surgery.

This is important since depending on how it is interpreted, the term "treatment by surgery" could encompass activities which are not remotely surgical e.g. a routine injection of a therapeutic or prophylactic agent, the taking of a drop of blood for a diagnostic test, the swallowing of a pill or inhaling of a preparation.

The full decision in the case can be found here on the EPO website.

The detailed reasoning provided by the Enlarged Board of Appeal provides valuable guidance on some broad issues. By way of summary, it was found that:

A. The exclusions from patentability which are found in the EPC are not required to be construed restrictively or narrowly. Instead, the Enlarged Board states that "...the general rule ... that a treaty shall be interpreted in good faith in accordance with the ordinary meaning to be given to the terms of the treaty in their context and in the light of its object and purpose must apply to the exclusion clauses contained in the EPC in the same manner as to any other provision,..."

The Enlarged Board stated that it was important that a provision (in this case an exclusion to patentability) "... is interpreted in such a manner that it takes its effect fully and achieves the purpose for which it was designed."

B. A method claim is excluded from patentability "... if it comprises or encompasses at least one feature defining a physical activity or action that constitutes a method step for treatment of the human or animal body by surgery or therapy."

C. The three alternative exclusions from patentability in Art 53(c) EPC 2000 (methods of treatment of the human or animal body by surgery, methods of treatment of the human or animal body by therapy, and diagnostic methods practised on the human or animal body) are distinct and independent exclusions, i.e. in order to be patentable a claimed method must neither be a therapeutic nor a surgical nor a diagnostic one.

Therefore, despite what is implied by the ordinary meaning of the word "surgery", the term "treatment by surgery" is not to be interpreted as being confined to surgical methods pursuing a therapeutic purpose.

D. Thus, an invasive step (in this case an injection into the heart) representing a substantial physical intervention on the body which requires professional medical expertise to be carried out, and which entails a health risk even when carried out with the required professional care and expertise, is excluded from patentability as a method of treatment of the human or animal body by surgery.

E. A claim which encompasses an embodiment which is excluded from patentability under Art 53(c) EPC cannot be left to encompass that embodiment. To resolve this, it may be possible to:

(i) omit the feature which is excluded from patentability, or

(ii) disclaim the excluded embodiments (subject to the strict conditions for disclaimers defined in decisions G1/03 and G2/03).

However, the resulting claim must also comply with the remaining requirements of the EPC, in particular Article 84/Rule 43 EPC (claims/form and content of claims) together with Articles 56, 83 and 123(2) EPC (inventive step, disclosure of the invention, and added subject matter respectively).

As a general note, it is strongly recommended that when drafting a method claim including a feature which might be excluded from patentability under Art 53(c) EPC (i.e. a feature which could be interpreted as a method for treatment of the human or animal body by surgery or therapy and diagnostic methods practised on the human or animal body) then in the application as originally filed that feature should either be:

(i) omitted from the claim, or

(ii) referenced as a feature distinct from the claimed method e.g. an agent/object that has been "pre-delivered" or "pre-implanted".

Inclusion of the feature in the claim may be essential for ensuring that it complies with the requirements of Articles 84/56/83 EPC, but it should be done so that protection is not sought for that feature itself.  

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