Surgery – Truss – Pad
Patent
1994-08-01
1996-11-12
Hindenburg, Max
Surgery
Truss
Pad
A61B 500
Patent
active
055730108
DESCRIPTION:
BRIEF SUMMARY
Probes of this kind are used in various fields of medicine, namely for therapeutic or diagnostic purposes in body cavities of the body to be treated, in particular for the introduction into the digestive or excretory tract.
Such a probe has a basic function, namely a relative displacement between the sheath and the core for the purpose of carrying out a specific function or manipulation in the body cavity.
With a probe having a sclerosation cannula a forwardly directed thrusting movement of the core is utilized for the purpose of injection. To this end, the core is manually advanced inside the sheath.
With a so-called controllable guiding probe with a deflectable probe tip, which is suitable in particular for seeking and introduction into bodily cavities progressing transversely, a driving device effective between the sheath and core is provided at the rearward end of the probe, by means of which driving device a pulling force and displacement directed to the rear can be effected manually upon the core, to bring about the deflection at the probe tip. For the purpose of retracting the probe tip, the core is manually pushed forwards with the aid of the driving device.
A configuration comparable in principle with the one described above is also present in a so-called biopsy probe, wherein the biopsy forceps are opened by means of the driving device through manual forward displacement of the core, and the biopsy forceps are closed by manually pulling the core backwards.
With so-called stiffening probes an axial compression of the sheath, consisting of elements arranged one after the other, is achieved by pulling action on the core, to the rear, producible manually by a tensioning device arranged at the rearward end of the probe. Here, the core exercises a tensioning force on the sheath, in the forward region of the sheath, whilst the sheath is supported in the rearward region by the separate tensioning device.
In many cases the probe, in its condition as inserted into the body cavity, is used as guiding element or guide rail for numerous medical instruments, such as in angiography catheters or dilatation instruments, which are advanced into the desired area of the body on the probe.
To carry out the relevant procedure, the probe is firstly inserted into the desired cavity structure of the body, e.g. inserted into the bile duct from the duodenum by means of an endoscope which is perorally introduced. The appropriate instrument is then advanced along the probe into the desired target area. In the case of the bile duct the instruments are often hollow probes (drains) which, in the case of tumorous constriction of the bile duct (malign stenosis), are pushed through the constriction and left in place. They bridge the stenosis thereby to ensure the drainage of the gall bladder.
There are two main requirements of such a probe, namely on the one hand a high degree of flexibility, for low risk introduction and placing of the probe, and on the other hand a certain rigidity, especially for guiding purposes, e.g. stable guiding when carrying out bougienage, placing drains, etc. By means of purposive stiffening of the probe the difficulty of a loop forming can be overcome, e.g. when traversing the stomach.
Such a known probe, as described in the EP-A-0 131 847, ideally fulfils the above-described conflicting requirements. In a relaxed state the probe makes possible an atraumatic placing thereof, and by tensioning the desired rigidity of the probe can be set. The probe consists of an elastic flexible sheath, in which a core is longitudinally displaceably guided, the length of the core being considerably greater than the length of the sheath. The core has a ball-like stop part on its forward end and a disc-like stop on its rearward end, whereby both parts are rigidly attached to the core. The extra length of the core is required to enable a tensioning device to be applied between the sheath and the core, and to be able to pull the core in its longitudinal direction, in order to draw the stop part of the core, in its forward
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patent: 4757827 (1988-07-01), Buchbinder et al.
patent: 4811743 (1989-03-01), Stevens
patent: 4886067 (1989-12-01), Palermo
patent: 4940062 (1990-07-01), Hampton et al.
patent: 5001825 (1991-03-01), Halpern
patent: 5133364 (1992-07-01), Palermo et al.
Eckart Frimberger
Hindenburg Max
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