Abstract:
Disclosed herein is a medical device including: a positioning catheter to be inserted into a blood vessel in the vicinity of an affected region; a treatment catheter to be inserted to reach the affected region; and attracting means provided at respective predetermined positions of both the catheters to apply a magnetic force in a direction of attracting each other; wherein the magnetic force of the attracting means restricts floating of the treatment catheter.

Description:
CROSS REFERENCES TO RELATED APPLICATIONS 
       [0001]    The present invention contains subject matter related to Japanese Patent Application JP 2006-268628 filed in the Japan Patent Office on Sep. 29, 2006, the entire contents of which being incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a medical device and using method thereof to cure a valve body of a human heart or the like. 
         [0004]    2. Description of the Related Art 
         [0005]    One of recent problematic heart diseases is such that blood does not flow normally because of incomplete closing of a heart valve body. Examples of such heart diseases include mitral insufficiency in which blood flows back from the left ventricle into the left atrium because of the incomplete closing of a mitral valve and aortic insufficiency in which blood flows back from the aorta into the left ventricle because of incomplete closing of the aortic valve. 
         [0006]    These diseases are curable by narrowing an opening portion formed in the heart valve body. Examples of such treatments include a drug treatment and an open-heart operation. In order to cure a heart disease caused by structure only by a drug treatment, it is difficult to adjust the dosage of drugs and there is a problem with fast-acting property. Therefore, these diseases are cured by an open-heart operation. The permanent operation eliminates the risk of relapse though it is invasive. However, inclusively taking into account a risk resulting from the extracorporeal circulation of blood during the operation and the magnitude of invasion resulting from thoracotomy, it is desired to perform the operation through percutaneous catheterization which provides the same effect as that of the open-heart operation. 
         [0007]    To meet the desire, the medical device described in U.S. Pat. No. 6,542,766 B2 (see abstract, columns 2 and 3, FIGS. 2A and 16, etc.) has been proposed recently. This medical device is used for treatment as below. A tubular magnetic elongate element is led to a heart using a catheter. A magnetic line is applied to the elongate element from outside so as to orient it in a predetermined direction. Thereafter, an electric current is applied from the magnetic elongate element to an affected area for removal or a drug solution is directly applied to the affected area. 
         [0008]    U.S. Pat. No. 6,890,353 B2 (see abstract, etc.) discloses a device which sort of reinforces a mitral valve by implanting a tunnel member in the coronary vein of the heart. 
         [0009]    U.S. Pat. No. 6,840,246 B2 (see abstract, etc.) discloses a device which is used to narrow an opening portion by sewing a mitral valve while visually observing the inside of the heart with an endoscope. 
         [0010]    In the device disclosed in U.S. Pat. No. 6,542,766 B2, it is difficult to perform the following procedure. A procedure catheter is placed in constantly flowing blood as in the heart and a magnetic line is applied from outside to the procedure catheter to prohibit it from floating. In addition, the treatment using a treatment catheter is limited so that also the treatment has a problem in view of accuracy. In the device disclosed in U.S. Pat. No. 6,890,353 B2, since a foreign object is implanted in the blood vessel, it is probable to impede the smooth flow of the blood. In the device disclosed in U.S. Pat. No. 6,840,246 B2, since the inside of the heart is visually observed with an endoscope, a large amount of normal saline must be allowed to flow to ensure a range of view. However, despite this, it is probably not to perform the accurate visual observation. 
       SUMMARY OF THE INVENTION 
       [0011]    It is an object of this invention to provide a medical device which has a simple configuration and which restricts floating of a treatment catheter even in blood flow to bring it into positional fixation, sufficiently ensures an assistant force needed to treat an affected area, and simplifies a correct treatment. 
         [0012]    It is an object of this invention to provide a medical device that includes: a positioning catheter to be inserted into a blood vessel in the vicinity of an affected region; a treatment catheter to be inserted to reach the affected region; and attracting means provided at respective predetermined positions of both the catheters to apply a magnetic force in a direction of attracting each other; wherein the magnetic force of the attracting means restricts floating of the treatment catheter. 
         [0013]    It is an object of this invention to provide a using method of the medical device restrict floating of a treatment catheter by a magnetic force of the attracting means, including the steps of: inserting a positioning catheter in a blood vessel close to an affected region; inserting the treating catheter to reach the affected region; and allowing both the catheters to attract each other by the attracting means which are provided at respective predetermined positions of both the catheters to apply a magnetic force. 
         [0014]    In the present invention, the positioning catheter to be inserted into a blood vessel (a coronary vein) in the vicinity of an affected region and the treatment catheter to be inserted to reach the affected region are each provided with the attracting means for applying a magnetic force in a direction of attracting each other. The magnetic force can be applied to the positioning catheter from a position extremely close to the treatment catheter so that the treatment catheter can more forcibly be pulled to restrict the floating thereof. Thus, even if cure is performed under the condition where a quantity of blood flows, the treatment catheter will not be floated by the blood, which enhances the operability encountered when a predetermined procedure is carried out. In addition, the treatment can be performed easily and quickly, with a high degree of accuracy. In particular, the magnetic force is strengthened in inverse proportion to distance squared. If the magnetic adsorption force is used, it is necessary to reduce the distance therebetween as much as possible. For example, the distance between the coronary vein and the coronary artery in the heart is about  2 . 5  mm. The magnetic force applied between both the catheters at such a distance provides a fixation force stronger than that obtained by inducing the treatment catheter with a magnetic field outside a body or the heart. 
         [0015]    The treatment catheter uses the magnetic force of the attracting means to take a position conforming to the positioning catheter; therefore, sort of an initial position is specified. Also in this point, the operability during the treatment is enhanced. In particular, if the procedure in which the treatment catheter punctures a valve body or the like is performed, the magnetic force attracting the treatment catheter assists force needed for the procedure. Also in this point, the high-accuracy, speeding-up, and facilitation of the treatment can be promoted. 
         [0016]    If the clip member or the anchor member is used as the inosculating means for narrowing the opening portion of the mitral valve or aortic valve, it is necessary to ensure force adapted to pass the valve body through the narrowed opening portion. If the positioning catheter forcibly pulls the treatment catheter at close range, the magnetic force assists the force needed for the puncture of the clip member or anchor member. Further, the treatment catheter which serves to hold such inosculating means can positionally be fixed. In this way, the procedure is performed in this fixed state, which can assist the procedure itself of the inosculating means. 
         [0017]    If the positioning catheter and treatment catheter are each provided with the markers at its leading end, the positions of both the catheters can be identified, whereby the high-accuracy, speeding-up, and facilitation of the treatment can further be promoted. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         [0018]      FIG. 1  is a schematic cross-sectional view illustrating usage of a medical device according to an embodiment of the present invention; 
           [0019]      FIG. 2  is a schematic cross-sectional view of a main portion of the embodiment; 
           [0020]      FIG. 3  is a cross-sectional view taken along line  3 - 3  of  FIG. 2 ; 
           [0021]      FIG. 4  is a cross-sectional view taken along line  4 - 4  of  FIG. 2 ; 
           [0022]      FIG. 5  is a schematic perspective view illustrating application example 1 of the adsorption section; 
           [0023]      FIG. 6  is a schematic cross-sectional view of application example 2 of the adsorption section; 
           [0024]      FIG. 7  is a schematic perspective view of application example 3 of the adsorption section; 
           [0025]      FIG. 8  is a schematic perspective view of application example 4 of the adsorption section; 
           [0026]      FIGS. 9A ,  9 B and  9 C are schematic views of a main portion of the mitral valve, illustrating an abnormal state, a treatment state by inosculating section and a treatment completion state, respectively; 
           [0027]      FIGS. 10A ,  10 B and  10 C are schematic views illustrating usage example 1 of the inosculating section,  FIG. 10A  illustrating a state where the inosculating section punctures one of the mitral valves,  FIG. 10B  illustrating a state where the inosculating section punctures both the mitral valves, and  FIG. 10C  illustrating a state where the inosculation is complete; 
           [0028]      FIG. 11  is a schematic cross-sectional view illustrating usage example 2 of the inosculating section; 
           [0029]      FIG. 12  is an enlarged cross-sectional view of a main portion of  FIG. 11 ; 
           [0030]      FIGS. 13A and 13B  are cross-sectional views taken along line  13 - 13  of  FIG. 12 , illustrating a guide catheter provided with adsorption section at its tip; 
           [0031]      FIG. 14  illustrates an anchor member by way of example; 
           [0032]      FIG. 15  is an enlarged cross-sectional view of a main portion of fastening section included in the anchor member; 
           [0033]      FIG. 16  is a schematic cross-sectional view illustrating a puncturing state of the anchor member; and 
           [0034]      FIG. 17  is a schematic cross-sectional view illustrating usage example 3 of the inosculating section. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0035]    Preferred embodiments of the present invention will hereinafter be described in detail with reference to the accompanying drawings. 
         [0036]    As shown in  FIG. 1 , a medical device of the present embodiment is used to cure mitral insufficiency and adapted to reduce the area of a mitral orifice O surrounded by a mitral valve Mv of a heart H. 
         [0037]    The medical device generally includes a positioning catheter  10 , a treatment catheter  20  and an adsorption section  30 . The positioning catheter  10  is disposed in a coronary vein (or a coronary artery) close to the mitral valve Mv which is an affected region. The treatment catheter  20  is inserted very close to the affected region. The adsorption section  30  is attached to the tips of the positioning catheter  10  and treatment catheter  20  to apply a magnetic force in the direction of attracting each other. The magnetic force of the adsorption section  30  pulls the treatment catheter  20  toward the positioning catheter  10  to restrict floating of the treatment catheter  20 . Thus, the position of the treatment catheter  20  is brought into a fixedly stationary state, thereby achieving the smoothness, speeding-up, facilitation and accuracy of treatment. 
         [0038]    The further detailed description is made. The positioning catheter  10  is a thin tube inserted into a blood vessel, e.g. a coronary vein  11  located close to the mitral valve Mv which is the affected region. The positioning catheter  10  is formed of a material such as vinyl chloride, PCB (polychlorobiphenyl), polypropylene, polyimide, or the like so as to have a usual outer diameter of about 0.9 mm. An insertion method involves inserting the positioning catheter  10  into an inferior vena cava of a femur and allowing it to reach a coronary vein  11  present along the outer circumference of the heart H from the outside. Although any method may be adopted, the tip of the positioning catheter  10  will be implanted in the coronary vein  11 . 
         [0039]    Referring to  FIG. 2 , the positioning catheter  10  is provided at its leading end with a plurality of permanent magnets  31  axially spaced apart from each other, which serves as the adsorption section  30 . The plurality of permanent magnets  31  are provided to be axially spaced apart from each other so that the treatment catheter  20  described later can be superposed on, be commensurate with, attracted to and held by the linear positioning catheter  10 . Consequently, floating of the treatment catheter  20  can be restricted more forcibly. In particular, a magnetic force is strengthened in inverse proportion to distance squared. Therefore, if the distance between the positioning catheter  10  and the treatment catheter  20  is reduced as much as possible, a fixation force can be provided which is stronger than that obtained by inducing the treatment catheter with a magnetic field outside a body or the heart. The distance between the coronary vein  11  and the inside of the atrium is about 2.5 mm. With this distance, if a magnetic force is applied between the catheters  10 ,  20 , an extremely intense magnetic force can be applied. Consequently, a fixation force can be provided which is stronger than that obtained by inducing the treatment catheter from outside a body or the heart with a magnetic field. 
         [0040]    Referring to  FIG. 3 , the permanent magnet  31  is formed of a tubular hollow body received in the catheter  10  for the purpose of weight reduction. However, the permanent magnet  31  may be formed of a solid body. Alternatively, a thin circular permanent magnet may be stuck on the external surface of the catheter  10  in some situations. 
         [0041]    On the other hand, as shown in  FIGS. 2 and 4 , the treatment catheter  20  includes a guide catheter  20   a , a procedure catheter  20   b  inserted into the guide catheter  20   b , and inosculating section B provided in the procedure catheter  20   b . These catheters  20   a ,  20   b  are formed of the same material as that of the positioning catheter  10 . Although not restrictive, for example, the outer diameter of the guide catheter  20   a  is about 2 mm to 4 mm and the outer diameter of the procedure catheter  20   b  is about 0.5 mm to 2 mm. 
         [0042]    In the embodiment, the procedure catheter  20   b  is loosely fitted into the guide catheter  20   a ; therefore, it can freely be moved forward or backward or operatively turned in the guide catheter  20   a  so as to enhance the procedure operability. Thus, the accuracy, smoothness, speeding-up, and facilitation of the treatment can be enabled. 
         [0043]    As shown in  FIG. 2 , the guide catheter  20   a  is provided at its leading end with a plurality of to-be-attracted members  32  as the adsorption section  30  axially spaced apart from each other. The to-be-attracted member  32  is made of a metal material with magnetically attracted performance such as stainless steel. As shown in  FIG. 4 , a thin circular member stuck on the external surface of the guide catheter  20   a  is used as the to-be-attracted member  32 . Preferably, the to-be-attracted member  32  is provided on the external surface of the guide catheter  20   a  in order to make it easy to be attracted by the magnetic force (broken line arrows in  FIG. 2 ) of the permanent magnets  31 . However, the to-be-attracted member  32  may be provided on the inner surface of or in a wall thickness portion of the guide catheter  20   a.    
         [0044]    Needless to say, the adsorption section  30  is not necessarily configured such that the positioning catheter  10  is provided with the permanent magnets  31  and the treatment catheter  20  is provided with the to-be-attracted member  32  and it may be configured vice versa. Specifically, the following examples are applicable. 
         [0045]    Application example 1 shown in  FIG. 5  is configured such that a sheet-like permanent magnet  31  is fitted and bonded to a recessed portion  33  formed by partially removing the positioning catheter  10  or the guide catheter  20   a.    
         [0046]    Application example 2 shown in  FIG. 6  is configured such that a sheet-like permanent magnet  31  is placed on the surface of the positioning catheter  10  or guide catheter  20   a  and covered by a thin sheet  34 . 
         [0047]    Application example 3 shown in  FIG. 7  is configured such that a so-called magnet chip  35  is buried in or bonded to a hole portion  36  bored in the catheter  10  or guide catheter  20   a.    
         [0048]    Application example 4 shown in  FIG. 8  is configured such that a flat formed induction coil  37  is bonded to the front surface of the positioning catheter  10  or guide catheter  20   a  and current-controlled by a control unit  38  from the outside. However, these adsorption sections  30  are only exemplary and the present invention is not limited to such an adsorption section  30 . 
         [0049]    The so-called markers m made of a radiopaque material (e.g. gold, silver, platinum, tungsten, palladium or the alloy thereof) is provided in the vicinities of the adsorption section  30  included in the positioning catheter  10  and treatment catheter  20 . With such markers, the respective tips of the catheters  10 ,  20  can accurately be led to and implanted at a predetermined position in the coronary vein  11  close to the mitral valve Mv or at a position very close to the mitral valve Mv which is an affected region, while confirming the positions of the catheters  10 ,  20  in the living body. 
         [0050]    In this way, the adsorption section  30  and the markers m are provided for each of the treatment catheter  20  and positioning catheter  10 . The catheters  10 ,  20  can independently be inserted into a living body from different positions by an operator manipulating them. This can achieve the smoothness, speeding-up, facilitation and accuracy of the procedure. 
         [0051]    The inosculating section B provided in the treatment catheter  20  is used to reduce the area of the mitral orifice O surrounded by a mitral valve Mv. If normal, the mitral valve Mv is such that a pair of valve bodies is superposed with each other so as to allow blood to flow in one direction. If abnormal, the mitral valve Mv has a large opening portion O as shown in  FIG. 9A . The mitral valve Mv is cured by inosculating both lateral portions of the opening portion O so as to come close to each other by use of line members  40 , thereby making the opening portion O small as shown in  FIG. 9C . 
         [0052]    The following section can be used as the inosculating section B by way of examples. 
       USAGE EXAMPLE 1  
       [0053]    The inosculating section B 1  of usage example 1 includes the line member  40  inserted in the procedure catheter  20   b  and fracture section  41  (schematically shown in  FIG. 10C ) which fractures or cuts the line member  40  every predetermined length. 
         [0054]    The line member  40  is made of a shape memory alloy so as to be extremely thin. After punctured the affected region, if the line member is fractured or cut by the fracture section  41 , it functions as a loop-like clip member  40   a  which self-deforms arcuately. This clip member  40   a  self-deforms to narrow the opening portion O. 
         [0055]    The fracture section  41  is composed of a remote-controllable scissors-like member. However any member will be applicable as long as it can fracture or cut the line member  40 . If the line member  40  is preliminarily formed with weakened portions (not shown) such as notches every predetermined length, fracture can easily be done by the fracture section  41  and thus the procedure can smoothly be performed. However, it is not necessarily needed to use the fracture section in the present embodiment. For example, if the fracture section fractured every predetermined length is continuously inserted into the procedure catheter  20   b , inosculation can be performed only by sequentially feeding the line member from the procedure catheter  20 . 
         [0056]    The inosculating procedure is performed as below. As shown in  FIG. 10A , the line member  40  is slightly fed from the end of the procedure catheter  20   b . In the state where the thin line member  40  is slightly projected from the end of the procedure catheter  20   b , the line member  40  exhibits extremely high rigidity and functions similarly to a needle. This makes it possible to puncture one of the valve bodies of the mitral valve Mv. After one end of the line member  40  punctures one of the valve bodies of the mitral valve Mv, the line member  40  is fed from the procedure catheter  20   b  or fractured by the fracture section  41 . At this time, as shown in  FIG. 10B , the line member  40  self-deforms circularly and the other end of the line member  40  moves toward and punctures the other valve body of the mitral valve Mv. Then, the line member  40  deforms so as to be wound or to make a U-turn. In short, the line member  40  exhibits a loop by itself to thereby function as a clip member  40   a  which inosculates the mitral orifice O surrounded by a mitral valve Mv, reducing the area of the mitral orifice O small. 
       USAGE EXAMPLE 2  
       [0057]    The inosculating section B 2  of usage example 2 is configured as below. A procedure catheter  20   b  projects from an opening  42  (see  FIG. 12 ) bored at an end portion of a guide catheter  20   a . An anchor member  43  provided at an end of the procedure catheter  20   b  makes a puncture in a mitral valve Mv. Thereafter, the anchor member  43  is made small by the fastening section  49  (see  FIG. 15 ) and released from the procedure catheter  20   b . Incidentally, if a guide member  45  (indicated with a chain line) is provided close to the opening  42  of the guide catheter  20   a , it is preferred that the procedure catheter  20   b  easily comes out of the opening  42 . 
         [0058]    The treatment catheter  20  is not necessarily needed to be installed parallel to the axis of the positioning catheter  10 . If the easiness of the procedure or technique is ensured, the treatment catheter  20  may be arranged perpendicularly to the axis of the positioning catheter  10 . To provide such arrangement, an adsorption section  30  provided for the guide catheter  20   a  is preferably configured such that for example a permanent magnet  31  or a to-be-attracted member  32  is provided at the tip of the guide catheter  20   a . To attach the permanent magnet  31 , as shown in  FIG. 13A , a stepped portion  46  may be formed at the tip of the guide catheter  20   a  and the permanent magnet  31  may be secured to the stepped portion  46  with an adhesive or the like. To attach the to-be-attracted member  32 , similarly the to-be-attracted member  32  may be secured to the stepped portion  46  with an adhesive or the like as shown in  FIG. 13B . 
         [0059]    As described above, the tip of the guide catheter  20   a  is closed and the procedure catheter  20   b  provided inside the guide catheter  20   a  is projected from the lateral side of the guide catheter  20   a . This facilitates positioning of the procedure catheter  20   b  relative to the mitral valve Mv, whereby the procedure is made further reliable and accurate. 
         [0060]    The inosculating section B 2  uses an anchor member  43  which includes an almost-U-bent line member  47  and arrow portions  48  provided at tips of the line member  47 , as shown in  FIG. 14 . The anchor member  43  is attached to fastening section  49  provided at the tip of the procedure catheter  20   b . The anchor member  43  is punctured into the mitral valve Mv, and then fastened to be made small, and thereafter released together with the fastening section  49  from the procedure catheter  20   b.    
         [0061]    Referring to  FIG. 15 , the fastening section  49  is configured as below. A turn-up portion  51  is provided at the tip of the procedure catheter  20   b  and a through-hole  52  is formed at the center of the turn-up portion  51 . An arcuate protruding head portion  43   a  formed in the anchor member  43  is grasped by the inner circumferential portion of the turn-up portion  51 . A string like member  50  is joined to the protruding head portion  43   a.    
         [0062]    The inosculation is performed by the fastening section  49  as below. After the puncture of the anchor member  43 , the procedure catheter  20   b  is pulled axially rearward, whereby the inner circumferential portion of the turn-up portion  51  makes the anchor member  43  small. As shown with outline arrows in  FIG. 16 , this allows the valve bodies of the mitral valve Mv to be abutted against each other, which reduces the opening area of the opening portion O. When the procedure catheter  20   b  is further pulled rearward, the stringlike member  50  is overcome by the state of the engagement between the anchor member  43  and the mitral valve Mv to fracture or to be withdrawn. Consequently, the anchor member  43  and the fastening section  49  are released from the procedure catheter  20   b.    
         [0063]    If the fastening section  49  is used for the puncture as described, the arrow portions  48  of the anchor member  43  puncture both the valve bodies of the mitral valve Mv at the same time. After the puncture, if the procedure catheter  20   b  is pulled rearward, the anchor member  43  can be implanted on the mitral valve Mv, which makes the procedure easy. 
         [0064]    In particular, when the anchor member  43  punctures the mitral valve Mv, the puncture force direction of the anchor member  43  may be coincident with the attractive force direction of the to-be-attracted members  32  of the guide catheter  20   a  depending on the procedure or puncture position. The adsorption section  30  directly assists the puncture of the anchor member  43 , which makes the procedure extremely smooth. 
       USAGE EXAMPLE 3  
       [0065]    The inosculating section described above uses the clip member  40   a  or the anchor member  43  to make the mitral orifice O surrounded by a mitral valve Mv small. The present usage example uses a fusion member  53  to perform fusion or thermocoagulation through electric section. 
         [0066]    The inosculating section B 3  is configured to include a fusion member  53 , specifically an RF (radio frequency) electrode, provided at the tip of a procedure catheter  20   b . The fusion member  53  of the procedure catheter  20   b  is inserted between the valve bodies of a mitral valve Mv. Radio-frequency current is then applied from external control section (not shown) to the fusion member for heating while controlling the temperature of the RF electrode. Thus, the tissues of both the valve bodies of the mitral valve Mv are heat-sealed or heat-coagulated for joining. 
         [0067]    Preferably, also the fusion member  53  is made of a shape memory alloy. At first the fusion member  53  is linear when located inside the guide catheter  20   a . This makes it easy for the fusion member  53  to move inside the guide catheter  20   a . When the fusion member  53  reaches the mitral valve Mv, it bends at a predetermined angle and is easily inserted between the valve bodies of the mitral valve Mv. Thus, the use of the memory shape alloy can make the procedure smooth and is preferable in view of operability. 
         [0068]    Incidentally, the fusion member  53  can use e.g. ultrasonic sound, laser, microwaves or the like as an energy source. A gripping member may be provided near the RF electrode to enable the constant application of a press-fitting force to the tissue contracted by the heating. 
         [0069]    A description is next made of the function of the embodiment of the present invention. 
         [0070]    At first, an operator inserts a guide wire (not shown) into a living body, passes the positioning catheter  10  through the living body using the guide wire as a guide and inserts it into the coronary vein  11  of the heart. When the positioning catheter  10  reaches the vicinity of the mitral valve Mv, it is maintained at the position. 
         [0071]    Next, the operator inserts a guide wire (not shown) into the living body from an inferior vena cava J (see  FIG. 1 ). The operator passes the treatment catheter  20  through the living body using the guide wire as a guide, inserts it from the right atrium R of the heart through a valve-like portion (not shown) of a membrane S between the right atrium R and the left ventricle L and delivers it to the position of the mitral valve Mv. 
         [0072]    Incidentally, the insertion of the catheters  10 ,  20  can be performed while confirming the positions of the markers m with X-ray irradiation or the like; therefore, the positions of the catheters  10 ,  20  in the living body can accurately be grasped. 
         [0073]    The treatment catheter  20  is attracted to an appropriate position by the adsorption section  20  of the positioning catheter that has preliminarily been inserted. Thus, although under the condition where the heart H acts to pump a quantity of blood, the treatment catheter  20  does not float but can be held position-fixedly. 
         [0074]    In other words, the thin positioning catheter  10  that is easily inserted into the heart H is used, inserted into a relatively narrow portion or the coronary vein  11  and brought into an immovable state. The treatment catheter  20  that is similarly easily inserted into the heart H is fixed in position by using the positioning catheter  11 . Although in blood, the floating of the treatment catheter  20  is restricted by the positioning catheter  10 . Thus, the procedure by the treatment catheter  20  is significantly simplified and becomes accurate. 
         [0075]    In addition, if the treatment catheter  20  holding the inosculating section B is positionally fixed, the direction of force adapted to insert the inosculating section B into the valve body may be coincident with the direction of attracting force of the adsorption section  30 . Thus, the adsorption section  30  will exhibit a large assistant force for the procedure. 
         [0076]    When the procedure catheter  20   b  projects from the tip of the treatment catheter  20 , the guide wire is withdrawn and the inosculating section B inserted into the procedure catheter  20   b  is operated to start the procedure. 
         [0077]    For example, for the inosculating section B 1 , the line member  40  is allowed to project from the tip of the procedure catheter  20   b  and operated to puncture both the valve bodies of the mitral valve Mv. After the puncture, the line member  40  comes into a wound state by itself to move toward the other valve body for puncture. After the confirmation of the puncture, the line member  40  is fractured by the fracture section  41  to come into a loop state by itself, functioning as the clip member  40   a  to inosculate the mitral orifice O surrounded by a mitral valve Mv , thereby reducing its area of the mitral orifice O. Incidentally, if the line member  40  is fed every predetermined length without fracture, it is preferred that the line member be fed gradually while confirming the puncture to the other valve body of the mitral valve Mv. 
         [0078]    For the inosculating section B 2 , the procedure catheter  20   b  is allowed to project from the opening  42  bored at the leading end portion of the guide catheter  20   a . The anchor member  43  provided at the tip of the procedure catheter  20   b  punctures the mitral valve Mv and then is fastened by the fastening section for inosculation. 
         [0079]    For the inosculating section B 3 , the fusion member  53  provided at the tip of the procedure catheter  20   b  is inserted between the valve bodies of the mitral valve Mv. Radio-frequency current is then applied from the external control section to the mitral valve Mv for heating while controlling the temperature of the RF electrode. Thus, the tissues of both the valve bodies of the mitral valve Mv are heat-sealed or heat-coagulated for joining. 
         [0080]    After the procedure is completed as described above, the procedure catheter  20   b  is moved backward in the guide catheter  20   a  to withdraw the entire treatment catheter  20  from the living body and also the positioning catheter  10  is withdrawn from the living body. 
         [0081]    The present invention is not limited to the embodiments described above but can be modified or altered in various ways by those skilled in the art in the scope of the technical concept of the invention. For example, the embodiments described above can be used to cure the mitral valve Mv but the invention is not limited to this. The invention can be used for the case where the closing conditions of various valve bodies such as an aortic valve are poor, or for the cure not only for the heart but also for a portion where a relatively thick blood vessel exists close to an affected region. 
         [0082]    The present invention can be used as a medical device that can inosculate the opening portion of a mitral valve simply and safely. 
         [0083]    While preferred embodiments of the present invention have been described using specific terms, such description is for illustrative purposes, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.