Apparatus for forming curvilinear profile of distal part of bowden of implanted auricle electrode

FIELD: medical technique.

SUBSTANCE: apparatus includes base supporting guides and carriage mounted with possibility of motion along guides. Rotary platform is mounted on base behind horizontal guides of carriage. On one edge of platform there is opening in which vertical shaping pin is arranged. Said pin is secured to base. On other edge of platform there is indicator of platform rotation angle. Guiding tube is mounted between said edges and pressing spring if arranged in parallel relative to said tube with possibility of axial motion. Adjusting and pressing screws are mounted respectively at both ends of said spring. Carriage includes clamping mechanism and handle moving carriage on guides. Member for controlled limitation of horizontal motion of carriage is mounted on base between horizontal guides of carriage.

EFFECT: possibility for simplified forming of curvilinear profile of distal part of bowden.

1 dwg

 

The invention relates to medical equipment, namely, devices for forming curvilinear profile of the distal portion atrial implantable electrode for pacing the heart. The device will find effective application in the manufacture of implantable atrial electrodes of different designs.

Implantable endocardial atrial electrode is a complex medico-technical device, consisting of the distal part, directly introduced into the cavity of the heart and introduced into the tissue of the myocardium, and the proximal portion connecting with the contacts of the stimulator and the conductive part made in the form of spiral springs - Bowden, located in silicon isolation. Curved element distal portion of the electrode plays an important role in ensuring the fixation of the electrode in the atrium and transmitting electrical pulses from the pacemaker to the heart and the reverse detection of electrical impulses from the heart to the control element of the stimulator.

One of the most important structural elements atrial implantable electrodes is curved part that ensures that the distal portion of the electrode on the inner side of the atrium. The correct location and reliable fixation of the distal portion of the electrode for shatterbone curvilinear profile of the distal portion of the Bowden is a necessary and crucial challenge for the effective stimulation of the Atria (see Youedit, Addreview, LII “Programmable electrical stimulation of the heart. - M.: Medicine, 1989, p.7-24). The radius of curvature and angle of turn of the distal portion of the electrode ensures the stability of the mounting of the electrode in the atrium. The curved distal portion of the electrode prevents tension, thereby preventing the displacement of its end, and avoids sharp bends in the contraction of the heart and, therefore, fractures of the electrode. The loop is particularly necessary when making endocardial of electrical stimulation in children. In these cases, the loop serves as a reserve length with the growth of the child (page 17 of the book “Programmed electrical stimulation”).

The formation of the curvilinear profile of the distal portion of the Bowden electrode is a complex technological challenge due to lack of specialized devices for these purposes.

A device for winding a coil spring on the mandrel (see N..Sobolev Machines accurate industry”, “national Defense Industry publishing house”. - M.: 1953, str, RES, Annex).

The device comprises a mandrel on which is wound a spiral. For the manufacture of a spring fixed end of the wire in the hole of the clamp and rotate the mandrel together with the buckle.

A significant disadvantage of this device is that it is precisely suitable for the manufacture of single spiral springs, electrical parameters which do not meet the requirements of modern implantable electrodes. In addition, the distal portion of the Bowden electrode of the spiral springs made on this device, will have a straight profile, and not curved loop, which does not allow for reliable mounting of the electrode in the atrium.

It is also known a device for coiling springs of small diameter (Neproblem “Machines accurate industry”, str-273 RIS, 218a Centralnaya street, Annex), the closest to the technical nature of the patented device and is taken as a prototype.

The device consists of the following main parts: the front of headstock, tailstock, carriage and frame. The front spindle headstock is driven by a motor. The tailstock spindle has a jam Chuck with a hole for fixing the end of the wire. The tailstock spindle receives motion from the front spindle headstock through a system of gears. Front and tailstock are connected by two cylindrical rails moves the carriage. A mandrel for winding the spring is first clamped in Cams cartridge front grandmother, and then the Cams Chuck tailstock. The wire is placed on an axis fixed in brackets connected with the base of the carriage.

From the coil wire of the IDA is to the mandrel through the guide rollers, the holes in the rack and knife and rollers.

This device makes it possible to produce single spring type and has significant design flaws which limit the scope of its practical use. Thus, in particular, made coil springs do not meet the technical requirements bodenham for implantable pacing electrodes, because they have a lower electric conducting, low mechanical strength and elasticity.

A significant drawback of the known device is that Bowden of coil springs made on this machine, will have a rectilinear shape, which does not meet the requirements to designs distal atrial implantable electrode. Rectilinear profile of the distal portion of the electrode is not possible to provide the fastening head cardioelectric in the front wall of the atrium, significantly increases the risk of fracture of Bowden in the process of operation of an implantable electrode.

The present invention solves the task of developing a device for forming a curved profile of the distal portion atrial implantable electrode.

The solution of this problem is achieved as follows.

In the device containing the grounds that there are guides and coaches the and, mounted for movement along the guides, according to the present invention on the basis of a horizontal guide carriage is mounted a turntable. On one edge of the turntable is made of the hole, which is a vertical molding pin secured on the base, at the other end - the index of the turn angle of the platform, and between fixed guide tube. Parallel to the pipe is mounted with the possibility of axial movement, the presser spring, the edges of which are mounted the adjusting and clamping screws. Thus according to the invention, the carriage includes a locking mechanism and a handle for moving the carriage along the guide rails, and between the horizontal rails of the carriage on the base mounted adjustable stop horizontal movement of the carriage.

The technical result of the present invention is realized the possibility of manufacturing the distal part of boudinov implantable cardioelectric with varying degrees of curvature and shape of the loop. The developed device allows the appropriate changes inter-turn spacing of the coil spring locally in the distal part of Bowden and thereby to form the desired curved profile of the distal portion. If there is a loop in the distal katibougou implantable electrode provides high mechanical reliability of fastening of a head of the electrode in the heart muscle, virtually eliminates the possibility of fracture of Bowden in the process of wearing the device by the patient.

The invention is illustrated by the example of a specific implementation of the device for forming a curved profile of the distal portion of the Bowden electrode and drawing, which presents the developed device (top view).

Apparatus for forming curved profile of the distal portion of the Bowden comprises a base 1 on which is mounted the carriage 2 horizontal movement of the pushrods. The base 1 includes a horizontal rails 3 to move the carriage 2 and the stopper 4 horizontal movement of the carriage. In rails 3 mounted rollers 5 horizontal movement of the carriage.

The carriage 2 includes rollers 6 for vertical movement of the carriage, the clamping mechanism 7, the handle 8 to move the carriage 2.

The clamping mechanism 7 fixation of the rectilinear part of the Bowden operation and can be performed, for example, in the form of two parallel clamping jaw and a screw clamp.

On the basis of 1 for horizontal rails 3 with the rotary platform 9, one edge of which is a hole in which is located a vertical molding pin 10 is secured on the base 1, which allows you to set the platform 9 under various planetnotion axis Bowden, fixed in the clamping mechanism 7 of the carriage 2. Vertical molding pin 10 is designed to be deformed straight part of Bowden in a given area of its distal part.

On the rotary platform 9 is mounted hollow guide tube 12 and parallel to it pressing spring 11. Pressing spring 11 serves to deform the straight part of Bowden. On the inner surface of the compression spring 11 is located a friction protrusion, which is in the process of working directly presses Bowden to the lateral surface of the forming pin 10 and creates a force to deform the straight part of Bowden.

On the rotary platform 9 are mounted adjustment 13 and 14 clamping screws, which provide an appropriate contact force of the spring 11 to the forming pin 10 and the corresponding deflection of the distal portion of Bowden.

At the lower edge of the platform 9 is the index of the angle of turn 15 the rotary platform 9 that allows you to adjust the change in the bend radius of the curved part of the atrial electrode.

The formation of the curvilinear profile of the distal portion of the Bowden is as follows.

The carriage 2 is set in the extreme right position (close to the rotary platform 9). Bowden is inserted through the hole of the guide tube 12 from the side of the pointer is the depth of the pivot 15 of the platform 9 to the molding pin 10, go around it and fill in the clamping mechanism 7 and clamp. Thus, the straight portion 16 of the Bowden side of the clamping mechanism 7, and its curved part 17 - in the field of molding pin 10 and the guide tube 12.

Set the turntable 9 on the estimated angle spread. The turn angle is controlled by the pointer angle of turn 15. Clamping screw 14 and the adjusting screw 13 carried out moving the clamping spring 11 with friction ridges provide the desired contact pressure of the pushrods to the side surface of the pin 10.

Set the limiter 4 horizontal movement of the carriage 2 on the calculated distance. Handle 8 moves the carriage 2 to the left to the stop 4. In the process of moving the carriage 2, and accordingly movement of the Bowden relative to the forming pin 10 is formed with a curvilinear profile of the distal portion of Bowden.

The magnitude of the horizontal movement of the carriage 2, the force pressing the spiral of pushrods to the lateral surface of the forming pin 10 and the turn angle of the rotary platform 9 achieved the prescribed geometric dimensions of the curved profile of the distal portion of Bowden.

Operation of prototypes patented device for forming a curved profile of the distal part of the atrioventricular what about the electrode has confirmed their high technological efficiency. This device allows to form the curvilinear profile of the distal part of the atrial electrode with different predetermined degree of bending. The device is compact and easy design implementation, does not require significant effort to be deformed Bowden. High performance patented device guarantees him a wide and effective use of the manufacturers of implantable atrial electrodes.

Apparatus for forming curved profile of the distal portion of the Bowden implantable atrial electrode containing a base on which are rails and a carriage mounted for movement along the guide rails, characterized in that on the base, a horizontal guide carriage is mounted a turntable, on one edge of the platform made a hole in which is located a vertical molding pin secured on the base, at the other end - the index of the turn angle of the platform, and between fixed guide tube, which is set in parallel with the axial movement of the presser spring, the edges of which are mounted the adjusting and clamping screws, carriage contains the clamping mechanism and the handle to move the carriage along the guide rails, and between the horizontal rails of the carriage on the base mounted adjustable stop horizontal movement of the carriage.



 

Same patents:

FIELD: medical technique.

SUBSTANCE: apparatus includes base supporting guides and carriage mounted with possibility of motion along guides. Rotary platform is mounted on base behind horizontal guides of carriage. On one edge of platform there is opening in which vertical shaping pin is arranged. Said pin is secured to base. On other edge of platform there is indicator of platform rotation angle. Guiding tube is mounted between said edges and pressing spring if arranged in parallel relative to said tube with possibility of axial motion. Adjusting and pressing screws are mounted respectively at both ends of said spring. Carriage includes clamping mechanism and handle moving carriage on guides. Member for controlled limitation of horizontal motion of carriage is mounted on base between horizontal guides of carriage.

EFFECT: possibility for simplified forming of curvilinear profile of distal part of bowden.

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FIELD: manufacture of springs, possibly for furniture, particularly manufacture of springy mattresses for soft furniture.

SUBSTANCE: method comprises steps of feeding round cross section wire; forming and binding knots on supporting turns due to twisting wire end under predetermined pressure around supporting turn; before forming spring blank, imparting to wire out-off-round cross section or making spring blank from wire having out-off-round cross section. When wire end portion is twisted around supporting turn in contact zone of twisted wire and wire of supporting turn recesses are formed on portions of supporting turn wire having positive deflection from out-off-roundness due to creation of pressure exceeding preset value. Twisted wire is pressed-in to said recesses.

EFFECT: enhanced strength of knots, increased useful time period of spring, operational reliability of articles.

2 cl

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