Surgery – Instruments – Means for inserting or removing conduit within body
Reexamination Certificate
1999-08-20
2001-11-13
Schaetzle, Kennedy (Department: 3762)
Surgery
Instruments
Means for inserting or removing conduit within body
C607S126000
Reexamination Certificate
active
06315781
ABSTRACT:
TECHNICAL FIELD
The invention refers to a device for extracting an object featuring a longitudinal inner lumen from its anchoring in a body, in particular a cardiac pacemaker cable having an electrode cable with a spiral coil, with the device having a tube through which a cable extends which, on its distal end projecting from the tube, has an anchoring part which can be inserted into the inner lumen of the object together with the tube, where such anchoring part can be activated through a relative motion between the tube and the cable by means of an actuation device.
BACKGROUND ART
Such a device for extracting a cardiac pacemaker electrode which has grown onto the heart by means of cardiac pacemaker electrode cable with a spiral coil is known from the international patent application WO 91/19532 A1 and has an anchoring part in the form of a split tube segment connected to the distal end of the cable and whose ends facing the tube have been slightly pre-spread towards the outside. By pulling on the cable, the pre-spread, split tube segment is activated, the tube segment halves are spread apart and their free ends engage in the inner side of the spiral coil of the electrode cable.
In a device of this type, depending on the diameter of the inner lumen of the electrode cable, different sizes must be provided for the anchoring part of the extraction device. Another disadvantage is that in case the diameter of the inner lumen is too large, the tube segment halves can fold, as a result of which safe anchoring is no longer ensured.
In addition, such an extraction device only works reliably with multiple-coil electrodes, in particular four-coil electrodes.
U.S. Pat. No. 5,632,749 also describes a device of above type in which the anchoring part is a split sleeve which can be activated by means of a relative motion between the tube and the cable. The sleeve is split along its longitudinal axis and designed in such a way that its diameter can be enlarged for the purpose of activating the device. For that purpose, on the distal end of the tube as well as on the distal end of the cable, conical surfaces facing each other are provided which can be engaged by pulling the cable, causing the split sleeve to enlarge and press against the spiral coil of the electrode cable along a large number of coils in order to achieve traction. Such a type of device has the disadvantage that sufficient traction requires large axial forces on the split sleeve by pulling the cable and holding against it with the tube. Another disadvantage is that only a relatively small enlargement of the diameter of the split sleeve is possible, as a result of which, depending on the diameter of the inner lumen of the spiral coil of the cardiac pacemaker cable, different sizes of extracting devices must be available.
DISCLOSURE OF INVENTION
Based on the state of the art described above, the object of the invention is to produce an extraction device, in particular an extraction device for single-coil or multiple-coil cardiac pacemaker electrodes, which can be used reliably and largely independent of the diameter of the inner lumen and which makes it possible to transmit large extraction forces.
In a device of the type identified above, this task is solved by providing the tube with a contact surface on its distal end and the anchoring part with a stop surface on its side facing the tube, with the contact surface and the stop surface forming an acute angle with each other in such a way that the anchoring part can be tilted towards the anchoring in the inner lumen of the object with respect to the longitudinal axis of the tube, in case the contact surface and the stop surface engage under force.
In a preferred embodiment, the anchoring part comprises a tube segment whose outside diameter corresponds to the outside diameter of the tube and which has been produced by simply cutting off tube segments at an angle. In such a tube segment, which has the shape of a parallelogram in its longitudinal cross section, a tilting moment is produced in a simple manner through the pulling force on the cable and transferred to the anchoring part, as a result of which, after bending the cable and tilting it in top view towards the longitudinal axis of the tube, the outline of the anchoring part are enlarged, which allows it to reliably engage the spiral coil of an electrode cable.
It is obvious that in lieu of a tube segment with one or two ends having been cut off at an angle, anchoring parts of a different shape can be used; it is only important that such anchoring parts are shaped in such a way that they permit, after bending of the cable and tilting the anchoring part, traction or lockup with the interior wall of a cavity of the object to be extracted.
In a preferred embodiment, the stop contact of the anchoring extends at an angle to the longitudinal axis of the tube part prior to its activation, whereas the contact surface of the tube is perpendicular to the longitudinal axis of the tube.
Such an arrangement has the advantage of simple producibility and reliable transmission of large forces.
The distal end face of the tube segment can run transversally to the longitudinal axis of the tube segment or at an angle to the longitudinal axis of the tube segment. Preferably, the end face and the stop surface run parallel to each other. To achieve proper cable guiding, the cable has an outside diameter which is roughly equivalent to that of the interior diameter of the tube segment and of the tube. Preferably, the cable is only fastened on the distal end of the anchoring part, as a result of which the anchoring part can easily be tilted by bending the cable, and no large forces are required for tilting and radial displacement. It is advisable that prior to tilting of the anchoring part, the stop surface and the longitudinal axis of the tube and the cable form an angle between 15 and 75 degrees. In this case, the contact surface of the tube may also be at an angle of less than 90 degrees with respect to the longitudinal axis of the tube.
The actuation device has a threaded bolt connected to the cable; such threaded bolt has an actuation sleeve with an internal thread which can be pulled to create a force against a handle sleeve in which the proximal end of the tube has been fastened. Instead of using a threaded assembly, however, it is also possible to create the tractive force directly with a sleeve which can be locked in a retreated position, e.g. by a bayonet-like connection.
Below, this present invention is explained in detail in a reference example shown in the drawing.
REFERENCES:
patent: 4574800 (1986-03-01), Peers-Trevarton
patent: 4576162 (1986-03-01), McCorkle
patent: 5242430 (1993-09-01), Arenas et al.
patent: 5620451 (1997-04-01), Rosborough
patent: 5632749 (1997-05-01), Goode et al.
patent: 6136005 (2000-10-01), Goode et al.
patent: 0573334 (1993-05-01), None
patent: 91/19532 (1991-12-01), None
patent: 97/17021 (1997-05-01), None
Reinhardt Jorg
Schreiber Siegfried
Baker & Daniels
Schaetzle Kennedy
Vascomed Institute Für Kathetertechnologie GmbH
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