Patent ID: 7273456

Claim:
Apparatus for analyzing surgery on a duct forming part of a human or animal body, wherein the apparatus comprises: gathering means for gathering at least one series of measurements of a physical phenomenon associated with the surgery or likely to be associated therewith comprising measurements of flow rate for a fluid flowing in the duct; and determining means for using a predetermined mother wavelet Ψ to determine for at least one value of a predetermined parameter a: the partition function Z(q,a) such that: Z ⁡ ( q , a ) = ∑ b i ⁢ ⁢  T Ψ ⁡ [ s ] ⁢ ( b i , a )  q where: a is the scale parameter of the wavelet transform and is positive; q represents the moments of the measure distributed on the wavelet transform modulus maximum (WTMM) tree; s is a signal representing variation in the measurements of the series as a function of a variable such as time; T Ψ ⁡ [ s ] ⁢ ( b , a ) = 1 a ⁢ ∫ Ψ _ ⁡ ( x - b a ) ⁢ s ⁡ ( x ) ⁢ ⅆ x where Ψ is the complex conjugate of the function Ψ(x) in an orthonormal base; b is a position parameter; x is a variable in function of which the signal s is recorded; and {(b i ,a)} i is the set of local maxima in T as a function of a; the spectrum of the function T (q) such that: Z(q,a)≈a T(q) in the limit a → 0 + ; the spectrum of the function D(h) such that: D ⁡ ( h ) = min q ⁢ ( qh - τ ⁡ ( q ) ) ⁢ ⁢ and and an index l(a) depending on said spectrum of the function D(h), which index is calculated by a predetermined formula, index l(a) permitting determination of the level of perturbations in the signal.