Tip sizer

Abstract

A supported portion (21) and a supported portion (23) are formed at a position closer to the center side than the inner peripheral surface (15) of the cusp size measuring device (1). A hexagonal hole (22) is formed on the upper surface of the supported portion (21), and a hexagonal hole (24) is formed on the upper surface of the supported portion (23). The hole (22) and the hole (24) are inclined relative to the bottom surface. A support rod with a hexagonal cross-section is inserted into the hole (22) or the hole (24). When the support rod (2) is inserted into the hole (22), the surgeon brings the first contact needle portion (13) into contact with the connecting portion located on the right side of the cusp before the cusp is removed. The surgeon rotates the support rod (2) while bringing the outer peripheral surface (10) into contact with the aorta (100) with the first contact needle portion (13) as a base point, and brings the second contact needle portion (14) into contact with the aorta (100).

Description

Technical Field

[0001] The present invention relates to a valve cusp sizer. Background Art

[0002] As an invention for measuring the size of the valve cusp of the aorta, there is a valve cusp sizer disclosed in Patent Document 1, for example. The valve cusp sizer has an arc surface, and stylus parts that contact the connecting part of the valve cusp are provided at both ends of the arc surface. The valve cusp sizer is provided with multiple sizes of arc surface with different lengths, and the multiple valve cusp sizers each have a handle to be held by the user. When measuring the size of the valve cusp, the surgeon inserts the valve cusp sizer into the valve ring part of the aorta, and confirms the nominal diameter of the valve cusp sizer that the positions of the two stylus parts are consistent with the positions of the connecting part.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-77838 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the cusp sizer disclosed in Patent Document 1, a handle is attached to the center of a partial cylinder forming an arc surface. When measuring the size of the cusp, the cusp sizer is pressed against the inner wall of the aorta. However, if the handle is attached to the center of the partial cylinder forming an arc surface, the cusp sizer may be pressed in the radial direction of the aorta. In this case, the aorta will become wider, and the cusp size cannot be accurately measured.

[0008] An object of the present invention is to provide a valve cusp sizer capable of accurately measuring the size of a valve cusp.

[0009] Means for solving problems

[0010] The present invention provides a valve cusp sizer having a back surface that contacts a living body and a hole for inserting a support rod formed on an upper surface at a predetermined distance from the center in the left-right direction to at least one of the left-right directions.

[0011] In the present invention, a supported portion that protrudes from the front side in a direction opposite to the rear side may be provided at an end portion in the left-right direction, and the hole may be formed on an upper surface of the supported portion.

[0012] Furthermore, in the present invention, a hole for inserting the supporting rod may be further provided at a position spaced a predetermined distance from the center in the left-right direction in the direction opposite to the one direction.

[0013] Furthermore, in the present invention, the hole may be configured to be inclined with respect to the bottom surface.

[0014] Effects of the Invention

[0015] According to the present invention, the size of the valve cusp can be accurately measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the valve cusp sizer 1 according to one embodiment of the present invention.

[0017] Figure 2 It is a front view of the valve cusp sizer 1 .

[0018] Figure 3 yes Figure 1 AA line section view.

[0019] Figure 4 This is a diagram when the end portion of the valve cusp sizer 1 is viewed in the radial direction.

[0020] Figure 5 This is a diagram for explaining how to use the valve cusp sizer 1 .

[0021] Figure 6 The diagrams show a valve cusp sizer 1A and a valve cusp sizer 1B according to a modified example.

[0022] Figure 7 The diagrams show valve cusp size measuring devices 1C to 1E according to modified examples.

[0023] Figure 8 This is a diagram showing a state where the valve cusp size measuring devices 1C to 1E are connected.

[0024] Fig. 9 It is a diagram showing a valve cusp sizer 1F and a valve cusp sizer 1G according to a modified example. DETAILED DESCRIPTION

[0025] [Implementation Method]

[0026] Figure 1 is a top view of a valve cusp sizer 1 according to an embodiment of the present invention. Figure 2 This is a front view of the valve cusp size measuring device 1. Figure 3 yes Figure 1 The cusp sizer 1 is a surgical instrument used in aortic valvuloplasty or the like.

[0027] The cusp sizer 1 has a basic shape obtained by dividing a hollow cylinder into three equal parts along the central axis direction. That is, in the cusp sizer 1, the angle formed by a line extending one end face 17 in the circumferential direction (left-right direction) and a line extending another end face 18 in the circumferential direction is 120 degrees. The cusp sizer 1 is formed of a synthetic resin. The raw material of the cusp sizer 1 is not limited to synthetic resin, and may be other raw materials.

[0028] The cusp sizer 1 has an outer peripheral surface 10 (back surface) in contact with the inner wall of the aorta of the patient. When the cusp sizer 1 is viewed from above, the outer peripheral surface 10 is in the shape of an arc. An upper surface 11 is formed at a position closer to the center than the outer peripheral surface 10, extending from the outer peripheral surface 10 to the inner peripheral surface 15 (front surface). When the height of the outer peripheral surface 10 is compared with the height of the inner peripheral surface 15, the height of the outer peripheral surface 10 is higher than the height of the inner peripheral surface 15, and the upper surface 11 is inclined relative to the bottom surface 16. The radial cross section of the upper surface 11 is a straight line, but the radial cross section may also be a curve.

[0029] The cusp sizer 1 has a plurality of sizes, and the circumferential length of each outer peripheral surface 10 is different. The size of the cusp sizer 1 uses, for example, the diameter of a cylindrical shape before being divided into three equal parts as a nominal diameter for determining the size of the cusp, and the nominal diameter is an odd number from 17 to 35. The nominal diameter of the cusp sizer 1 is recorded on the upper surface 11, and the cusp sizer 1 is recorded on the upper surface 11. Figure 1 In the case of the valve cusp sizer 1 shown, the nominal diameter is 19. In addition, the nominal diameter may be an even number, and a configuration having both odd and even numbers may be adopted. In addition, the nominal diameter may be less than 17 or greater than 35.

[0030] A cylindrical first stylus portion 13 is formed at one end of the circumference of the upper surface 11, and a cylindrical second stylus portion 14 is formed at the other end of the circumference of the upper surface 11. Marks 41 are provided at the upper ends of the first stylus portion 13 and the second stylus portion 14 to align with the position of the intersection. The angle formed by the line connecting the center and the mark 41 of the first stylus portion 13 and the line connecting the center and the mark 41 of the second stylus portion 14 is 120 degrees. The first stylus portion 13 and the second stylus portion 14 are the parts that contact the intersection of the cusp when measuring the size of the cusp. The height from the bottom surface 16 to the upper end of the first stylus portion 13 and the height from the bottom surface 16 to the upper end of the second stylus portion 14 are the same height, which is higher than the height from the bottom surface 16 to the upper surface 11. As a result, the upper ends of the first stylus portion 13 and the second stylus portion 14 are brought into contact with the intersection, making it easy to measure the size of the cusp.

[0031] Figure 4This is a diagram of the first stylus portion 13 viewed radially from the center side of the valve cusp sizer 1. When the first stylus portion 13 is cylindrical, preferably half of the cylindrical shape protrudes circumferentially from the circumferential end surface 17. The second stylus portion 14 also has the same structure as the first stylus portion 13.

[0032] In addition, a mark 40 is provided on the upper surface 11. The mark 40 is provided at a position where the angle formed by the end surface 17 and the imaginary line extending from the mark 40 to the center of the cusp size measuring device 1 is 60 degrees. The mark 40 is colored in a color different from other parts. The mark 40 is a mark used when the start position of the suture of the cusp is drawn with a skin marking pen.

[0033] When a reference plane is set which is perpendicular to the central axis of the first stylus portion 13 and the central axis of the second stylus portion 14 and passes through the mark 40, and the intersection point of the reference plane and the first stylus portion 13 is defined as the intersection point ZR, and the intersection point of the reference plane and the second stylus portion 14 is defined as the intersection point ZL, the distance L1 from the intersection point ZR to the upper end of the first stylus portion 13 and the distance L2 from the intersection point ZL to the upper end of the second stylus portion 14 are preferably 4 mm or more. In addition, the lower ends of both ends of the outer peripheral surface 10 in the circumferential direction (the lower end of the outer peripheral surface 10 side of the end surface 17 and the lower end of the outer peripheral surface 10 side of the end surface 18) are preferably located below the reference plane. When the distances L1 and L2 are less than 4 mm and the lower ends of both ends of the outer peripheral surface 10 in the circumferential direction are located above the reference plane, the outer peripheral surface 10 of the cusp sizer 1 is easily tilted relative to the blood vessel wall when the cusp sizer 1 is brought into contact with the aorta. When the outer peripheral surface 10 of the cusp sizer 1 is in contact with the blood vessel wall at an angle, the first contact needle portion 13 and the second contact needle portion 14 are inclined, resulting in measurement of a size different from the actual size. If the distance L1 and the distance L2 are set to 4 mm or more, and the lower ends of both ends of the outer peripheral surface 10 in the circumferential direction are located above the reference plane, the outer peripheral surface 10 of the cusp sizer 1 is not easily inclined with respect to the blood vessel wall, and the first contact needle portion 13 and the second contact needle portion 14 are not inclined, so that the size of the cusp can be accurately measured.

[0034] A supported portion 21 and a supported portion 23 are formed at a position closer to the center side than the inner circumferential surface 15 of the cusp sizer 1. The supported portion 21 is formed to protrude from the position of the inner circumferential surface 15 toward the center direction from the end surface 17 along the circumferential direction with a predetermined width. A hexagonal hole 22 is formed on the upper surface of the supported portion 21. The hole 22 is located at a position spaced a predetermined distance from the center in the left-right direction to the right. The supported portion 23 is formed to protrude from the position of the inner circumferential surface 15 toward the center side from the end surface 18 along the circumferential direction with a predetermined width. A hexagonal hole 24 is formed on the upper surface of the supported portion 23. The hole 24 is located at a position spaced a predetermined distance from the center in the left-right direction to the left. The height of the inner circumferential surface 15 is the same as the height from the bottom surface 16 to the upper ends of the supported portion 21 and the supported portion 23. However, the height from the bottom surface 16 to the upper ends of the supported portions 21 and 23 may be lower than the height of the inner peripheral surface 15 , or may be higher than the height of the inner peripheral surface 15 .

[0035] The hole 22 and the hole 24 are holes for inserting the support rod 2 supporting the cusp sizer 1. The surface of the supported portion 21 having the hole 22 is inclined, and the hole 22 forms a predetermined angle with respect to the bottom surface 16 of the cusp sizer 1. In addition, the surface of the supported portion 23 having the hole 24 is inclined, and the hole 24 forms a predetermined angle with respect to the bottom surface 16 of the cusp sizer 1.

[0036] The support rod 2 is a rod having a hexagonal cross section. When the support rod 2 is inserted into the hole 22 or the hole 24, the cusp sizer 1 is supported by the support rod 2. Since the cusp sizer 1 is supported by the support rod 2, the supported portion 21 and the supported portion 23 only need to have a width wider than the support rod 2 in the circumferential direction, a height that the support rod 2 can be inserted into, and a length in the radial direction that the support rod 2 can be inserted into.

[0037] A convex portion 31 is formed along the circumferential direction on the end surface 17. The convex portion 31 has a circular cross section and protrudes from the end surface 17 by a predetermined length. A circular concave portion 32 is formed along the circumferential direction on the end surface 18 by a predetermined depth. The depth of the concave portion 32 is a depth for the convex portion 31 formed on another cusp sizer 1 to be inserted. The convex portion 31 and the concave portion 32 are an example of a connection unit of the present invention.

[0038] Figure 5 1 is a diagram for explaining the method of using the cusp sizer 1. When performing aortic valvuloplasty, after the cusp is removed from the aortic valve, the cusp sizer 1 supported by the support rod 2 is inserted into the aorta 100. Next, when the support rod 2 is inserted into the hole 22, as shown in FIG. Figure 5As shown in the upper figure of , the surgeon brings the first contact needle portion 13 into contact with the connecting portion K1 located on the right side of the cusp before the cusp is removed, and aligns the position of the mark 41 located on the first contact needle portion 13 with the connecting portion K1. Figure 5 As shown in the middle section of the figure, the surgeon rotates the support rod 2 while making the outer peripheral surface 10 contact the aorta 100 with the first stylus portion 13 as the base point, and Figure 5 As shown in the lower figure of FIG. , the second contact needle part 14 is brought into contact with the aorta 100 .

[0039] The surgeon confirms the position in the aorta 100 where the second contact needle portion 14 contacts. When the position where the mark 41 located on the second contact needle portion 14 contacts is the position of the junction K2 located on the left side of the cusp after resection before the cusp resection, the value recorded by the cusp size measuring device 1 used is the size of the cusp. When the position where the second contact needle portion 14 contacts deviates from the position of the junction K2, the surgeon uses another cusp size measuring device 1 of a different size to measure the size of the cusp. When the position of the mark 41 of the first contact needle portion 13 coincides with the junction K1, and the position of the mark 41 of the second contact needle portion 14 coincides with the junction K2, the surgeon draws a mark indicating the starting position of suturing at the position of the mark 40 with a skin marking pen.

[0040] When the support rod 2 is inserted into the hole 24, the second contact needle portion 14 is brought into contact with the junction K2 after the valve cusp sizer 1 is inserted into the aorta 100. The surgeon rotates the support rod 2, brings the outer peripheral surface 10 into contact with the aorta 100 with the second contact needle portion 14 as a base point, and brings the first contact needle portion 13 into contact with the aorta 100, thereby measuring the size of the valve cusp.

[0041] In addition, regarding the aortic valve, there is a case of congenital two-cusp valve. In the case of two-cusp valve, the surgeon measures the size of the cusp valve with the cusp sizer 1 after removing the cusp valve. For example, in the aortic valve with congenital two-cusp valve, there is sometimes a suture at a position different from the position of the two connecting parts. In this case, the surgeon regards the suture as the connecting part and performs the measurement in the same way as the case with three cusps. In addition, in the case of congenital two-cusp valve without suture, a cusp sizer 1 with a larger nominal diameter corresponding to the cusp size measurement in the case of two cusps can also be prepared. The surgeon obtains the value obtained by adding the measured sizes and dividing it by 3. When the obtained value is consistent with any one of the nominal diameters of the cusp sizer 1, the three cusp sizers 1 with the same nominal diameter are connected in a ring shape. For example, when the value obtained by adding the measured sizes and dividing by 3 is 21, since the nominal diameter of the cusp sizer 1 is an odd number from 17 to 35, there is a cusp sizer 1 corresponding to 21, and therefore three cusp sizers 1 having a nominal diameter of 21 are prepared and connected. In addition, as a cusp sizer to be connected to another cusp sizer, a cusp sizer having the first stylus portion 13 but not the second stylus portion 14 or a cusp sizer having the second stylus portion 14 but not the first stylus portion 13 is prepared. In addition, when providing a cusp sizer 1 having an even number in nominal diameter, if the value obtained by dividing by 3 is an even number, three cusp sizers 1 having an even number in nominal diameter are prepared and connected.

[0042] The surgeon arranges the three cusp sizers 1 to be connected in a ring shape in a ring shape, and inserts the convex portion 31 of each cusp sizer 1 into the concave portion 32 of the adjacent cusp sizer 1, thereby connecting the three cusp sizers 1 in a ring shape. The surgeon inserts the three cusp sizers 1 formed in a ring shape into the aorta, and marks the position of the first contact needle portion 13, the position of the second contact needle portion 14, and the position of the mark 40 on the inner wall of the aorta with a skin marking pen.

[0043] In addition, sometimes the obtained value does not match the nominal diameter of the cusp sizer 1. In this case, three cusp sizers 1 are selected so that the total value of the nominal diameters of the three connected cusp sizers 1 matches the total value of the measured sizes. For example, when the total value of the measured sizes is 65, the value obtained by dividing by 3 does not match the nominal diameters of the cusp sizers 1 of odd numbers from 17 to 35. In this case, for example, three cusp sizers 1 having nominal diameters of 23, 21, and 21 are connected so as to match the total value of the measured values. In addition, in the case of setting cusp sizers 1 having even nominal diameters, cusp sizers 1 having even nominal diameters may be combined.

[0044] When the hole for inserting the support rod 2 is located at the center of the cusp sizer 1 in the left-right direction, the cusp sizer 1 is stable with respect to the support rod 2, so when the outer peripheral surface 10 is to be brought into contact with the aorta 100, the cusp sizer 1 may be pressed toward the aorta 100 unintentionally. According to the present embodiment, the hole for inserting the support rod 2 is located at the end of the cusp sizer 1 in the left-right direction, and the cusp sizer 1 is not left-right even with respect to the support rod 2. Therefore, the cusp sizer 1 is guided to rotate rather than to press the cusp sizer 1 toward the aorta 100. Therefore, the aorta 100 is not easily pressed in the radial direction by the cusp sizer 1, and the aorta 100 does not expand, so that the size of the cusp can be accurately measured. In addition, according to the present embodiment, the supported portion 21 and the supported portion 23 are formed at the end of the circumferential direction when viewed in the circumferential direction, so that the first contact pin portion 13 or the second contact pin portion 14 is easily brought into contact with the interlocking portion at the start of measurement. In addition, according to the present embodiment, the holes for inserting the support rod 2 are located at both ends in the circumferential direction, so that both right-handed surgeons and left-handed surgeons can easily perform the measurement by replacing the holes for inserting the support rod 2. In addition, according to the present embodiment, when performing a three-cusp operation on a patient with two cusps, the three cusp sizers 1 are combined to form a ring shape, and the cusp sizers 1 connected in the ring shape are inserted into the aorta, thereby making it easy to mark the position of the junction and the suture start position of the cusp, thereby facilitating the suture of the cusp.

[0045] [Modifications]

[0046] The embodiments of the present invention are described above, but the present invention is not limited to the above embodiments and can be implemented in various other ways. For example, the above embodiments can be modified as follows to implement the present invention. In addition, the above embodiments and the following modifications can also be combined respectively.

[0047] The shapes of the supported parts 21 and 23 are not particularly limited, but are preferably chamfered rectangular parallelepiped shapes. Although not shown in the drawings, the supported parts 21 and 23 may be shapes other than those shown in the drawings.

[0048] In the above embodiment, the hole 22 and the hole 24 are hexagonal holes, but the shape of the hole 22 and the hole 24 may be a polygon other than a hexagon. In addition, the shape of the hole 22 and the hole 24 is not limited to a polygon, and may be a circle or an ellipse. In addition, the hole 22 and the hole 24 are inclined relative to the bottom surface 16 in the above embodiment, but may also be a non-inclined structure.

[0049] In the present invention, screws may be cut into the support rod 2, the hole 22, and the hole 24 so that when the support rod 2 is inserted into the hole 22 or the hole 24, the support rod 2 is fixed to the supported portion 21 or the supported portion 23 by the screws.

[0050] In the above-described embodiment, the valve cusp sizer 1 includes the supported portion 21 and the supported portion 23 , but may also be configured to include only one of the supported portion 21 and the supported portion 23 .

[0051] In the above embodiment, the valve cusp sizer 1 has a structure having a convex portion 31 and a concave portion 32, but is not limited to a structure having both. Figure 6 The cusp size measuring device 1A shown in the figure does not have the first stylus portion 13 and the second stylus portion 14, but has the convex portion 31 at both ends in the circumferential direction. Figure 6 The cusp sizer 1B shown in FIG. 1 is not provided with the second stylus portion 14 but has the recessed portions 32 at both ends in the circumferential direction. Figure 6 By arranging as shown, the cusp sizer 1, cusp sizer 1A, and cusp sizer 1B can be connected in a ring shape by fitting the convex portion 31 into the concave portion 32 of another adjacent cusp sizer.

[0052] In the above-described embodiment, the valve cusp sizer 1 includes the supported portion 21 and the supported portion 23 , but a configuration without the supported portion 21 and the supported portion 23 may be employed. Figure 7 This is a diagram showing an example of a valve cusp sizer that does not include the supported portion 21 and the supported portion 23 .

[0053] In the cusp sizer 1C, a first contact pin 13C having a semi-cylindrical shape is formed at one end in the circumferential direction, and a second contact pin 14C having a semi-cylindrical shape is formed at the other end in the circumferential direction. In the upper surface of the cusp sizer 1C, a hole 22C for inserting a support rod is formed at one end side in the circumferential direction, and a hole 24C for inserting a support rod is formed at the other end side in the circumferential direction. The hole 22C is formed at a predetermined distance from the center in the left-right direction to the right, and the hole 24C is formed at a predetermined distance from the center in the left-right direction to the left. A concave portion 32C is formed on the end surface of the cusp sizer 1C on the side where the first contact pin 13C is located. In addition, a convex portion 31C is formed on the end surface of the cusp sizer 1C on the side where the second contact pin 14C is located.

[0054] In the cusp sizer 1D, a stylus portion 13D having a fan-shaped cross section is formed at one end in the circumferential direction, and a recess 14D into which the first stylus portion 13C is inserted is formed at the other end in the circumferential direction. In the upper surface of the cusp sizer 1D, a hole 22D into which a support rod is inserted is formed at one end in the circumferential direction, and a hole 24D (not shown) into which a support rod is inserted is formed at the other end in the circumferential direction. The hole 22D is formed at a predetermined distance from the center in the left-right direction to the right, and the hole 24D is formed at a predetermined distance from the center in the left-right direction to the left. The recess 32D is formed on the end surface of the cusp sizer 1D on the side where the stylus portion 13D is located. In addition, a convex portion 31D is formed on the end surface of the cusp sizer 1D on the side where the recess 14D is located.

[0055] In the cusp sizer 1E, a stylus portion 14E having a fan-shaped cross section is formed at one end in the circumferential direction, and a recess 13E into which the second stylus portion 14C is inserted is formed at the other end in the circumferential direction. In the upper surface of the cusp sizer 1E, a hole 22E into which a support rod is inserted is formed at one end in the circumferential direction, and a hole 24E into which a support rod is inserted is formed at the other end in the circumferential direction. The hole 22E is formed at a predetermined distance from the center in the left-right direction to the right, and the hole 24E is formed at a predetermined distance from the center in the left-right direction to the left. A convex portion 31E (not shown) is formed on the end surface of the cusp sizer 1E on the side where the stylus portion 14E is located. In addition, a recess 32E (not shown) is formed on the end surface of the cusp sizer 1D on the side where the recess 13E is located.

[0056] Figure 8 This is a diagram showing a state where the cusp sizers 1C to 1D are connected. When the cusp sizers 1C to 1D are connected, the convex portion provided on the end surface in the circumferential direction is embedded in the concave portion provided along the circumferential direction of the adjacent cusp sizer. In addition, the first contact pin portion 13C is embedded in the concave portion 14D, and the second contact pin portion 14C is embedded in the concave portion 13E, and the contact pin portion 13D is aligned with the contact pin portion 14E, so that the cusp sizers 1C to 1E can be connected in a circular ring shape.

[0057] In addition, it can also be constructed as follows: Figure 7 In the cusp sizer 1D shown, the shape of the stylus portion 13D is the same as the shape of the first stylus portion 13C, and in the cusp sizer 1E, a recessed portion having the same shape as the recessed portion 13E is provided at the position of the stylus portion 14E.

[0058] In the above embodiment, the support rod 2 is inserted into the hole 22 or the hole 24. However, in the case where the cusp sizer 1 is not connected to another cusp sizer 1 and only the cusp size is to be measured, the support rod 2 and the cusp sizer 1 may be integrated.

[0059] In the above-described modification, three cusp sizers are combined to form a circular ring shape, but the configuration in which a plurality of cusp sizers are connected to form a circular ring shape is not limited to the above configuration. Fig. 9 It is a diagram showing an example of a valve cusp sizer 1F and a valve cusp sizer 1G according to a modified example.

[0060] The cusp sizer 1G has a basic shape obtained by dividing a hollow cylinder into three equal parts along the central axis direction. In the cusp sizer 1F, a first contact pin 13F having a semi-cylindrical shape is formed at one end in the circumferential direction, and a second contact pin 14F having a semi-cylindrical shape is formed at the other end in the circumferential direction. A groove 42 serving as a mark for aligning the position of the interlocking portion is formed at the upper end of the first contact pin 13F and the upper end of the second contact pin 14F. In the upper surface of the cusp sizer 1F, a hole 22F for inserting a support rod is formed at one end side in the circumferential direction, and a hole 24F for inserting a support rod is formed at the other end side in the circumferential direction. The hole 22F is formed at a predetermined distance from the center in the left-right direction to the right, and the hole 24F is formed at a predetermined distance from the center in the left-right direction to the left. A recess 60 is formed on the front surface of the cusp sizer 1F, and the recess 60 is formed in a groove shape toward the back side. The opening of the recessed portion 60 opens in the horizontal direction from the vicinity of the first contact pin portion 13F to the vicinity of the second contact pin portion 14F.

[0061] The basic shape of the cusp sizer 1G is a shape obtained by dividing a hollow cylinder into three equal parts along the central axis direction and removing 1 / 3 of the three equal parts. The cusp sizer 1G has a stylus portion 13G at the center in the circumferential direction. A groove 42 is formed on the upper surface of the stylus portion 13G as a mark for aligning the position of the interlocking portion. The arm portion 51 is a plate-shaped protrusion from one end of the cusp sizer 1G in the circumferential direction, and a hole 53 is formed at the front end to penetrate from the upper surface to the lower surface. The arm portion 52 is a plate-shaped protrusion from the other end of the cusp sizer 1G in the circumferential direction, and a hole 54 is formed at the front end to penetrate from the upper surface to the lower surface.

[0062] When the arm 51 and the arm 52 are inserted into the recess 60 and the support rod is passed from the hole 22F through the hole 53 or from the hole 24F through the hole 54, the cusp sizer 1G and the cusp sizer 1F are connected to form a ring shape. In the case of a patient with two cusps, the cusp sizer 1F and the cusp sizer 1G connected to form a ring shape are inserted into the aorta, and any one of the three grooves 42 is brought into contact with any one of the two intersecting parts, and a mark is drawn with a skin marking pen at the positions of the remaining two grooves 42. In addition, in the cusp sizer 1F and the cusp sizer 1G, a recess and a convex portion may be provided on the circumferential end surface, and the convex portion may be inserted into the recess, so that the cusp sizer 1F and the cusp sizer 1G are integrated into a ring shape. In addition, in the cusp sizer 1F and the cusp sizer 1G, when the concave portion and the convex portion are provided on the circumferential end surface similarly to the embodiment, the arm portion 51 and the arm portion 52 may not be provided.

[0063] Description of symbols

[0064] 1. 1A to 1G: cusp size measuring device; 2: support rod; 10: outer peripheral surface; 11: upper surface; 13. 13A to 13C: first contact needle part; 13D: contact needle part; 14. 14C: second contact needle part; 14D: recessed part; 14E: contact needle part; 15: inner peripheral surface; 16: bottom surface; 17, 18: end surface; 21: supported part; 22. 22C to 22E: hole; 23: supported part; 24. 24C to 24E: hole; 31. 31C to 31E: convex part; 32. 32C to 32E: recessed part; 40 to 41: mark; 42: groove; 51, 52: arm part; 53, 54: hole; 100: aorta; K1, K2: connecting part.

Claims

1. A valve cusp size measuring device, the basic shape of which is a shape obtained by dividing a hollow cylinder into three equal parts along the central axis direction, The valve cusp sizer comprises: a back surface that contacts the living body and is an outer peripheral surface of the basic shape having an arc shape when the cusp sizer is viewed from above; and A hole for inserting a support rod is formed on the upper surface at a predetermined distance from the center of the circumferential direction of the back surface to at least one side of the circumferential direction when viewed from above, and the position of the hole in the circumferential direction is located between an imaginary line passing through the center of the circumferential direction of the back surface and the central axis of the hollow cylinder and a line extending the end face of at least one side of the circumferential direction of the basic shape.

2. The valve cusp sizer according to claim 1, wherein: The end portion in the circumferential direction has a supported portion protruding from the front side in a direction opposite to the back side, The hole is formed on the upper surface of the supported portion.

3. The valve cusp sizer according to claim 1 or 2, wherein: A hole for inserting the support rod is further provided at a position spaced a predetermined distance from the center in the circumferential direction in the direction opposite to the one direction.

4. The valve cusp sizer according to claim 1 or 2, wherein: The hole is inclined relative to the bottom surface.

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