Methods of implanting an implantation device

Abstract

The implant implantation unit ( 2 ), at a determined position in the tubular element ( 51 ) with a wall comprising a cavity ( 50 ), is pushed there by a catheter ( 60 ) and the unit comprises deformable feelers ( 31 ) to, under the control of remote activation elements ( 42 ), change from a stowed form to a deployed functional form, to detect the cavity ( 50 ) and position itself there with reference to the position of the cavity.

Claims

The invention claimed is: 1. A method of implanting an implantation device for a valve prosthesis relative to a native heart valve, the method comprising: advancing an implantation device in a collapsed configuration to a position proximate a native valve having native valve leaflets, wherein the implantation device comprises a carrier element, a valve prosthesis supported by the carrier element, three feeler elements connected to and expandable radially outwardly relative to the carrier element; allowing the feeler elements to radially expand relative to the carrier element while the carrier element remains in the collapsed configuration; inserting each of the radially expanded feeler elements into a cavity defined by respective native valve leaflets and a wall of a blood vessel to which the native valve leaflets are attached; positioning the carrier element in the collapsed configuration in a space substantially surrounded by the native valve leaflets; and allowing the carrier element to radially expand and exert an outward radial force against the wall of the blood vessel, thereby anchoring the implantation device in position relative to the native heart valve. 2. The method of claim 1 , wherein advancing the implantation device in a collapsed configuration comprises advancing the implantation device via a catheter comprising an outer sleeve and an inner sleeve, and wherein allowing the feeler elements to radially expand comprises releasing the feeler elements from the outer sleeve and allowing the carrier element to radially expand comprises releasing the carrier element from the inner sleeve. 3. The method of claim 1 , wherein the native valve is an aortic valve. 4. A method of implanting an implantation device for a valve prosthesis relative to a native valve, the method comprising: maintaining an implantation device formed from a shape memory material in a collapsed configuration via a catheter; positioning the implantation device in the collapsed configuration relative to a native valve; releasing at least one element of the implantation device to radially expand the at least one element relative to a remainder of the implantation device; engaging the released at least one element with a native valve leaflet; and radially confining the remainder of the implantation device via the catheter to remain in the collapsed configuration during the releasing and engaging of the at least one element. 5. The method of claim 4 , wherein the at least one element comprises at least one arm having a free end, the method further comprising positioning the free end within a cavity defined by the native valve leaflet and a wall of a blood vessel to which the native valve leaflet is attached. 6. The method of claim 5 , further comprising releasing the remainder of the implantation device to radially expand the remainder of the implantation device. 7. The method of claim 6 , wherein releasing the remainder of the implantation device engages the native valve leaflet between the remainder of the implantation device and the at least one element. 8. The method of claim 4 , wherein the at least one element of the implantation device comprises three arms disposed substantially 120 degrees apart from each other, and wherein the method further comprises positioning each arm within an aortic sinus. 9. The method of claim 4 , radially confining the remainder of the implantation device via the catheter comprises radially confining a carrier element configured to support a valve prosthesis, wherein the at least one element is connected to the carrier element. 10. A method of implanting an implantation device relative to a native valve, the method comprising: advancing an implantation device comprising a carrier element and at least one feeler element connected to the carrier element to a position proximate a native valve having native valve leaflets; inserting the at least one feeler element into a cavity defined by one of the native valve leaflets and a wall of a blood vessel to which the native valve leaflet is connected; and positioning the carrier element in a space substantially surrounded by the native valve leaflets. 11. The method of claim 10 , further comprising positioning the carrier element and the at least one feeler element such that the one of the native valve leaflets is between the carrier element and the at least one feeler element. 12. The method of claim 10 , further comprising deploying the carrier element to anchor the implantation device relative to the native valve. 13. The method of claim 12 , wherein deploying the carrier element comprises expanding the carrier element. 14. The method of claim 13 , wherein expanding the carrier element comprises expanding the carrier element via a balloon. 15. The method of claim 13 , wherein expanding the carrier element comprises allowing the carrier element to self-expand. 16. The method of claim 13 , wherein expanding the carrier element comprises radially dilating a valve prosthesis carried by the carrier element. 17. The method of claim 12 , wherein deploying the carrier element comprises deploying the carrier element such that the carrier element exerts a radial force on the native valve leaflets and the wall of the blood vessel to which the native valve leaflets are attached. 18. The method of claim 17 , wherein the radial force is sufficient to anchor the carrier element relative to the native valve. 19. The method of claim 10 , further comprising deploying at least part of the at least one feeler element radially outwardly relative to the carrier element prior to inserting the at least one feeler element. 20. The method of claim 19 , wherein deploying the at least one feeler element comprises deploying the at least one feeler element independently of deploying the carrier element. 21. The method of claim 20 , wherein deploying the at least one feeler element comprises removing a sleeve within which the at least one feeler element is received during advancing of the implantation device. 22. The method of claim 10 , wherein advancing the implantation device comprises advancing an implantation device comprising a valve prosthesis carried by the carrier element. 23. The method of claim 10 , further comprising advancing a valve prosthesis to be carried by the carrier element to the carrier element positioned in the space. 24. The method of claim 10 , wherein advancing the implantation device comprises advancing an implantation device comprising a carrier element and a plurality of feeler elements disposed about the carrier element at spaced angular positions. 25. The method of claim 24 , wherein inserting the plurality of feeler elements comprises inserting each of the plurality of feeler elements into respective cavities defined by respective valve leaflets and the wall of the blood vessel to which the valve leaflets are attached. 26. The method of claim 10 , wherein inserting the at least one feeler element comprises inserting the at least one feeler element such that a free end of the at least one feeler element moves along an inclined base of the cavity and causes rotation of the implantation device. 27. The method of claim 10 , wherein inserting the at least one feeler element comprises inserting the at least one feeler element such that a free end of the at least one feeler element moves along an inclined base of the cavity and causes automatic positioning of the implantation device. 28. The method of claim 10 , wherein inserting the at least one feeler element comprises rotating the implantation device. 29. The method of claim 10 , wherein advancing the implantation device comprises advancing the implantation device to a position proximate an aortic valve. 30. The method of claim 10 , wherein advancing the implantation device comprises advancing the implantation device to a position proximate a native heart valve. 31. The method of claim 10 , wherein advancing the implantation device comprises advancing the implantation device with the at least one feeler element folded toward the carrier element. 32. The method of claim 10 , further comprising containing the carrier element within an inner sleeve and containing the at least one feeler element within an outer sleeve positioned concentrically about the inner sleeve during the advancing of the implantation device. 33. The method of claim 32 , further comprising sequentially deploying the at least one feeler element and the carrier element by sequentially removing the at least one feeler element from the outer sleeve and the carrier element from the inner sleeve. 34. The method of claim 10 , wherein inserting the at least one feeler element comprises inserting the at least one feeler element until a free end of the at least one feeler element substantially reaches a base of the cavity and provides a sensation permitting detection of a location of the implantation device. 35. The method of claim 10 , wherein advancing the implantation device comprises advancing the implantation device within a lumen of the blood vessel. 36. The method of claim 10 , wherein the carrier element comprises a tubular mesh structure, and the method further comprises expanding the tubular mesh structure after the positioning. 37. The method of claim 10 , wherein inserting the at least one feeler element comprises inserting exactly three feeler elements into respective cavities defined by respective native valve leaflets and the wall of the blood vessel. 38. The method of claim 10 , wherein inserting the at least one feeler element further comprises inserting at least one feeler element that extends in an axial direction and radially outwardly relative to the carrier element.
This application is a continuation of U.S. application Ser. No. 12/138,983, filed on Jun. 13, 2008, now U.S. Pat. No. 8,216,301, which is a continuation U.S. application Ser. No. 10/210,085, filed on Aug. 2, 2002, now abandoned, which applications are incorporated herein by reference in their entireties. TECHNICAL FIELD The current invention relates to an implant implantation unit and to a procedure for fitting the unit in a tubular element. The problem at the origin of the invention concerns the implantation of heart valves. Until recently this necessitated open heart surgical operations, with stages such as stopping the heart, the implementation of extra bodily blood circulation and restarting the heart after the implantation of replacement heart valves. These surgical operations are difficult and delicate and present mortal risks related to operating shocks. BACKGROUND Document U.S. Pat. No. 5,824,063 thus describes a unit carrying replacement heart valves, the unit comprising a tubular implant in synthetic material carrying internally a replacement valve in natural material. Documents U.S. Pat. No. 5,855,601 and U.S. Pat. No. 5,868,783 describe new heart valve implantation methods, which offer the advantage of avoiding open heart surgery. These methods provide the implantation, by movement through the blood circulation system, of a heart valve replacement unit comprising a radially expandable intra-vascular cylinder carrying a biological valve internally. An inflatable part of a balloon catheter is placed inside the carrier cylinder and the implantation is done by introduction into a vein and movement as far as the failed valve using A catheter. A two dimensional image screen display allows the detection that the carrier cylinder has reached the required position and the cylinder is then dilated by inflating the balloon through the catheter and maintains its expanded shape. The balloon is then deflated and withdrawn with the catheter. The carrier cylinder presents a sealed casing, which is thus forced against the artery wall, so as to avoid the blood flow bypassing the replacement valve. However, when the aorta is involved this procedure is not applicable because the coronary arteries open close to the failed native valves, so that the carrier cylinder is likely to block them, provoking the death of the patient. SUMMARY The inventors of the present application have therefore thought of providing two corresponding openings in the wall of the carrier cylinder casing. However, so that these openings will be placed opposite the two coronaries, the position of the carrier cylinder in the aorta must be completely controlled. Monitoring on the screen allows the progress, or axial position, of the carrier cylinder to be checked, but the angular position will be neither visible nor controlled. The applicants have therefore found a solution, described below, allowing the position of the carrier cylinder to be controlled. They have therefore thought about the resolution of the more general problem of positioning an implant unit or transport vehicle in a tubular element with difficult access and for which imaging is insufficient or even impossible. The field of application could thus concern other fields than the medical, such as the petroleum or nuclear industries, for installing sensors, valves and other items. The scope of the present application must therefore not be considered as limited to the resolution of the original problem. In a more general way, the invention aims to allow, the placing, in a difficult to access location of a tubular element, of a unit intended to carry an implant, whatever the function of the implant. To this end, the invention concerns in the first place a unit for the implantation in a determined position of a tubular element with a wall comprising a cavity, the unit being arranged to cooperate with means for driving the unit in the tubular element, a unit characterized by the fact that it comprises deformable feelers arranged so that, under the control of means for remote activation, it passes from a stowed to a deployed functional shape, to detect the cavity and position itself there with reference to the position of the cavity. Thus, the unit can be made to advance blind and the feelers allow the automatic detection of the cavity and positioning at it. The final required position can also be reached even through a contraction of the tubular element for example an access artery leading to an artery of larger diameter. The invention also concerns a process, which is not surgical and without therapeutic aim, for implantation of the inventive unit, at a predetermined position in a tubular element presenting a wall comprising a cavity which procedure is characterized by the fact that a user inserts the unit through an open end of the tubular element he activates drive means to make the unit advance to a position before the determined position, he commands the feeler remote activation means and, with the advance continuing, he stops the action of the drive means when he detects a blockage of the advance, indicating that the feeler means are positioned in the cavity. BRIEF DESCRIPTION OF THE DRAWINGS The characteristics and advantages of the present invention will appear more clearly with the aid of the following description of a particular form of the realization of the inventive unit and a variant, as well as the procedure for using it, with reference to the attached drawing, in which: FIG. 1 is a lateral cross section of the inventive unit, representing the feeler positioning and anchoring elements, associated with a cylinder carrying a valve prosthesis, the whole being covered by two removable concentric activation casings, FIG. 2 corresponds to FIG. 1 , the feeler positioning and anchoring elements having been deployed radially by axial withdrawal of the external casing, FIG. 3 corresponds to FIGS. 1 and 2 , with the carrier cylinder surrounded by positioning and anchoring feeler elements having been deployed radially after axial withdrawal of the internal casing, FIG. 4 is a lateral view of the carrier cylinder and the positioning and anchoring feeler elements, FIG. 5 is a lateral perspective view of the positioning and anchoring feeler elements, FIG. 6 is a schematic face view of the inventive unit, and FIG. 7 is a schematic lateral section of the variant. DETAILED DESCRIPTION As shown in FIG. 1 , the present implementation example corresponds to the medical problem, explained at the beginning, of implanting a functioning replacement valve for the native aorta valve. The valve implantation unit 10 comprises a carrier element 20 to hold the implant, joined to a plurality of feeler, or palpation, elements or fingers 30 , 31 , here regularly spaced angularly all around, for positioning and anchoring relative to relief features, specifically a cavity in the aorta wall, unit 10 being linked removably to a positioning catheter 60 . Unit 10 is associated with two concentric sleeves 41 , 42 for successive remote activation, by radial expansion, of feeler elements 30 , 31 then the carrier element 20 . The direction of movement of unit 10 is therefore towards the left in FIGS. 1 to 3 . Reference 62 represents an axis of symmetry and the drive direction of unit 10 and catheter 60 . The implantation valve forms a prosthesis 1 comprising valve units 2 of the valve whose shape and size correspond perfectly, in the operating position, to those of the native aorta valves 50 ( FIG. 2 ). The prosthesis 1 is fixed to the implant holding carrier vehicle element 20 , here comprising a cylindrical mesh in a bio-compatible material such as steel, gold alloys and for preference as here, nitinol, which comprises a shape memory nickel-titanium alloy offering the ability to regain its shape after initial deformation, here by radial compression. The fixing of prosthesis 1 to the cylindrical nitinol mesh is made in well defined locations leaving free those regions that correspond to the valve units 2 after deployment from the stowed position of FIG. 2 , as illustrated below in respect of FIG. 3 . FIG. 4 represents the cylindrical mesh 20 in the deployed form, carrying the valve units 2 also deployed internally, on which are connected the feeler elements 30 , 31 , here in the form of a generally cylindrical exterior ring of wire loops of which one ( 31 ) at least, here in fact three, protrudes laterally and towards the front, opposite the catheter 60 . In this example, the loops 31 extend, in the deployed position, in a direction inclined at about 30 degrees towards the front (direction of movement towards the target position) relative to the axis 62 of the mesh 20 and the ring 30 . The feeler elements 30 , 31 are joined to the cylindrical mesh 20 in such a way that their axial and angular positions relative to it are perfectly defined. The assembly, cylindrical mesh 2 and feeler elements 30 , 31 , is here composed of the auto expandable bio-compatible material mentioned above. The cylindrical carrier mesh 20 is here covered with an impermeable lateral casing intended to be pressed against the aorta wall to avoid bypassing by the blood circulation. FIG. 5 shows the feeler elements 30 , 31 in perspective. FIG. 6 is a schematic view, along the unit 10 axial direction, showing the three loops 31 protruding laterally from the tubular grid 20 that carries them, while the 2 valve units of the valve to be implanted are fixed internally to the carrier cylinder 20 . In addition, if necessary, an inflatable balloon, joined to the catheter 60 , can here be placed inside the carrier cylinder 20 , to be fed with liquid under pressure through catheter pipe 60 so as to cause or assist the radial expansion of the carrier cylinder 20 to the required deployed form. As the feeler elements 30 , 31 are made in a self expanding material such as nitinol, or an equivalent element forming an elastically protruding foot or finger, unit 10 is covered with an inhibition sleeve 42 to hold the feeler elements 30 , 31 in a stowed position, the loops 31 being folded on the ring 30 and thus also on the mesh 20 . Sleeve 42 extends to cover the catheter 60 . A second sleeve 41 , effectively the same length and without effect on the feeler elements 30 , 31 , is here similarly provided to hold the carrier cylinder 20 in the stowed position, so as to avoid unplanned deployment even in the absence of inflation of the balloon 3 . The two sleeves 41 , 42 , are mounted concentrically on the catheter 60 . The sleeves 41 and 42 are accessible from the end of catheter 60 opposite to the unit 10 . Elements 3 , 41 , 42 , and 60 comprise a functional catheter assembly separable from the unit 10 , for the positioning and switching on this latter and the payload ( 2 ). The two sleeves 41 , 42 inhibit the radial deployment or the structure 20 , 30 , 31 until the latter reaches the region of the native aorta valve 50 to be functionally replaced, and thus allow the introduction of unit 10 into the blood circulation system, such as a reduced diameter incised artery. As indicated, the catheter 60 , with balloon 3 , is detachably joined to the implantation unit 10 so as to allow an axial advance of the implantation unit 10 in the blood circulation system up to the implantation location, and the withdrawal of the catheter assembly 3 , 41 , 42 , 60 . To free itself, the catheter 60 comprises, in this example, at the fixed end of carrier cylinder 20 , a spring effect clamp (not shown), with remotely controlled teeth, fitted to rotate radially, for connection to the unit 10 and has a sliding central remote control metal wire to axially push back the claw branches or teeth so as to separate them radially and so free the catheter 60 of the implantation unit 10 according to the sugar claw principle. When the cylindrical mesh 20 is deployed, the pressure on the aorta internal wall is provided by the shape memory effect, which thus ensures the radial dilation of the prosthesis 1 . The failed native valve unit 50 is flattened by being pressed by the tubular grid 20 against the aorta internal wall, each of the three loops 31 protruding laterally having previously been engaged in one, specifically, of the three native valve units 50 and being similarly pressed to confirm its anchorage. The valve units 50 are thus clamped between the mesh 20 , 30 and the respective loops 31 . The implantation procedure for the unit 10 described above, according to the preferred method of implementation, comprises the following steps. After insertion of the implantation unit 10 into the circulatory system, and after having pushed it using the catheter 60 to a position above the final target position, here precisely where the unit 10 arrives in the aorta, and so that a large diameter space is thus offered to it, the following stage consists of freeing the lateral loops 31 , initially pressed against the stowed mesh 20 , 30 . The release of the loops 31 is done by withdrawing the external retention sleeve 42 ( FIG. 2 ), that is to say withdrawn whilst maintaining the thrust on the catheter 60 . The forward movement of the unit 10 continuing, the loops 31 , being then protruded laterally towards the front with respect to the axial direction of forward movement, in opposition to the catheter 60 , they form a sort of tripod and simultaneously penetrate the three respective native valves 50 , effectively identical, comprising an arrangement of connection pockets in a complete ring with each extending over 120 degrees, filling in total the whole of the perimeter of the aorta internal wall 51 . Each native valve unit 50 offers a rounded base. Each lateral protrusion 31 , turned towards the front, presses against the base of the native valve unit 50 concerned, in general in a point distant from the “lowest” point of the base, that is to say, the furthest from the catheter 60 . This is therefore a partial stop because the axial advance of the unit 10 continues by thrust from the catheter 60 , the axial thrust of the unit 10 causing it to slide to the lowest point. The bottom of the valve unit 50 thus comprises a sort of inclined plane guidance track (not orthogonal to the axis ( 62 ) of the aorta) which, in reaction to the axial forward force, creates a circumferential reaction force causing the rotation of the unit 10 until the feeler loop considered 31 reaches the lowest point, which corresponds to a complete end wall (with tangential plane orthogonal to the axis ( 62 ) of the aorta 51 ), and thus corresponds to the final axial and angular position sought for the unit 10 . Each lateral protrusion 31 , with rounded ends, here as a loop, so as to be able to slide in the bottom of the valve unit 50 , thus comprises, by continuous cooperation with the variable depth rounded base of the native valves 50 , means for rotational drive of the feeler elements 30 , 31 and thus also of the cylindrical mesh 20 , to which it is joined. However if the lateral protrusions 31 by chance bump against a native valve unit 50 commissure, the implantation unit 10 can be slightly withdrawn and the operator twists the catheter 60 so that it pivots angularly to be able to restart the positioning and anchoring operation. The assembly, feeler elements 30 , 31 and cylindrical mesh 20 , being positioned axially and at an angle with respect to the specific relief of the aorta comprising the native valve units 50 , it is then automatically positioned with respect to the two coronary openings ( 52 ) for which the axial and angular position with respect to the valve units 50 is determined and known, the valve unit-coronary axial distance evidently depending on the size of the patient. In the case considered here in which the three native valves 50 form a circular circumference to the aorta wall extending over 360 degrees, a single lateral protrusion is sufficient to modulo 120 degrees positioning and anchoring the cylindrical mesh 20 . As stated above, in a general case, there could only be one feeler 30 , 31 working with a row of cavities or pockets covering all the circumference of the tubular element, or even a single pocket of cavity 50 only occupying a sector of the circumference and a plurality of feelers 30 , 31 all around the unit 10 so that one of them fits in the cavity. It will be noted that, in the present example, modulo 120 degrees positioning can be tolerated because the two coronaries ( 52 ) naturally effectively show this angle. If this was not the case, it would be necessary laterally to enlarge two openings or serrations 22 provided in the casing 21 so that they were positioned opposite the coronaries ( 52 ) ( FIG. 4 and position marked on FIG. 3 .), or again to feel, using the feelers 31 , the coronaries ( 52 ) themselves, which also comprise cavities in the aorta 51 , and not to sense the native valve units 50 . This case corresponds to the variant described below. Positioning thus having been effected, the following stage, as show in FIG. 3 , consists of deploying the cylindrical mesh 20 carrying internally the valve units 2 by withdrawing the internal retaining sleeve 41 , to consolidate the anchorage and change the valve units 2 to their operational form. For the clarity of the drawing, in particular the protrusions 31 , the mesh 20 has been represented with a relatively small diameter, whereas in fact it matches that of the aorta 51 , with a slight increase to ensure the required lateral pressure. In the same way, two protrusions 31 have been represented, although in fact they are separated by 120 degrees, with the plane of FIG. 3 only in reality cutting one. For this reason, only a single coronary has been drawn ( 52 ). The three loops 31 protruding however provide by themselves a basic anchorage in the bottom of the pockets comprising the native valves 50 and ensure the positional stability of the prosthesis 1 . After a few weeks, fibrous tissue will cover the prosthesis 1 , combining with the lateral protrusions 31 to further improve the fixing. It will be noted however that, in the deployed position of the feeler elements 31 , it is not necessary that their free ends should be firmly pressed against the aorta 51 wall. It is sufficient that their radial extension should be sufficient that they hook, in passing, onto the valve units 50 . Because of this, when the feeler elements 31 are deployed, before the final position, the later axial translation of the unit 10 , up to this position, is done without “hard” rubbing under pressure, of the part of the loops 31 on the aorta wall 51 . The latter thus does not run any risk of damage due to scratching or piercing, the loops 31 being feelers, that follow the aorta wall 51 to detect the valve units 50 . As described above, rounded feet or lugs can also be suitable. The feeler loops 31 thus do not here have very firm anchoring of the unit 10 in the aorta 51 as their main function, because they do not aim to exert a large radial anchoring pressure. As indicated above, this is only a basic anchoring. It is then the radial deployment of the mesh 20 that creates, by shape memory, a definitive radial anchoring pressure that forces the mesh 20 under pressure against the aorta wall 51 and thus blocks any relative movement, such as the withdrawal of the unit 10 that could be due to blood flow, in a direction opposite to the insertion of the unit 10 . The feeler elements 11 are then functionally superfluous. They however contribute to maintaining position by pinching the valve units 2 . As the mesh offers a relatively high contact surface with the aorta 51 , any risk of damaging the latter is excluded. The shape memory material allows the radial pressure exerted on the aorta 51 to be precisely determined, the diameter of the latter thus increased being then perfectly defined, which eliminates all risk of excessive radial stress. The inventive procedure can be implemented in non-surgical manner and without therapeutic aims, to implant the unit 10 (or equivalent) in a determined position in a tubular elements offering a wall including a cavity, the procedure comprising the following stages: a user inserts the unit ( 10 ) into an open end to the tubular element, the user activates the drive means ( 60 ) (catheter, external magnet or other) to move the unit ( 10 ) up to a position upstream the determined position, the user commands the feeler element ( 30 , 31 ) activation means ( 42 ) and, the forward motion continuing, the user stops the activation of the drive means ( 60 ) when he detects a blockage of the advance, due to the fact that the feeler means ( 30 , 31 ) are positioned in the cavity. To ease the drive of the unit 10 , this one can be associated with a type of precursor rostrum 61 ( FIGS. 1 to 3 ) forming a guide, in the form of a cylindrical element of a limited diameter, joined to the catheter 60 . It will be noted that the implantation unit according to the invention can, first, be implanted alone, without implant or payload, the latter being implanted later on the implantation unit according to the same principle. In a similar case, the inventive unit comprises means for receiving the second support, to come, of the implant, said means being arranged to ensure the positioning and anchorage, both axially, by stopping, and radially, with angular error correction means such as a finger or cavity provided to fit with an element of matching shape in the second support. In the variant shown in FIG. 7 , the implantation unit has the reference 110 and comprises functional elements similar to those of unit 10 , with the same references preceded by the hundred 1 , which have not however all been represented, with the aim of clarity. The cylindrical carrier element 120 is joined to a feeler element 131 which protrudes laterally and which has the same type of construction as the carrier element 120 . In precise fashion, the feeler element 131 appears in the form of a cylinder, stowed radially in the rest position. When the unit 110 is pushed by the catheter 160 , towards the bottom in FIG. 7 , from a position above that shown, it engages in the coronary 52 when the free end is thus released from contact with the internal wall of the aorta 51 . The unit 110 thus comprises a type of fork that locks by stopping in the bifurcation between the aorta 51 and the coronary 52 . When the end position is reached the two cylindrical elements 120 , 131 are deployed by two balloons respectively and form a type of two fingered glove. Thus, during the positioning phase, the feeler 131 presents a radially stowed form, thus with reduced diameter not risking blocking the coronary 52 . Then the feeler 131 is deployed, by inflation of the associated remote control balloon, and constitutes a lining, or internal ‘casing’, pressed against the internal wall of the coronary 52 in accordance with the principle explained above for the carrier cylinder 20 . It will be noted that, as 120 and 131 each occupy a particular branch 51 , 52 , they can be considered as functionally equivalent, with the two principle functions if required. Each of them can in effect be a payload ( 2 ) carrier and can also be considered as being a feeler, because the aorta 51 can be considered (functionally in the context of the present invention) as being a cavity or branch with respect to the coronary 52 . Thus the feeler means comprise a cylindrical element 131 arranged to change from a stowed form to a radially deployed form, supported against a wall of the cavity, here the coronary 52 , under the influence of remote control means (balloon and catheter 160 ), To avoid the risks of movement of the feeler 131 into the coupling position to the coronary 52 , due to an angular error that necessitates several attempts, it can be arranged for a guide wire to be passed into the coronary 52 and the upper part of the aorta 51 , the unit 110 being threaded above it across the feeler 131 that is thus angularly oriented towards the coronary 52 . Another guide wire can at the same time guide cylinder 120 into the aorta 51 .

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