Medical connectors and coronary artery bypass surgery instruments

Abstract

To provide a medical connector which allows a user to detect that a connection state is stabilized, and a treatment instrument for a coronary artery bypass operation.SOLUTION: A medical connector 200 comprises a first connector (a detachable connector 50) and a second connector (a cap 70) connected to the detachable connector 50. The medical connector 200 also comprises a notification mechanism IN which indicates the connection of the detachable connector 50 with the cap 70 by a method detectable with a sense of touch and / or a sense of hearing.SELECTED DRAWING: Figure 7

Description

Technical Field

[0005]

[0001] The present invention relates to a medical connector and a treatment tool for coronary artery bypass surgery.

Background Art

[0002] Patent Document 1 describes a medical connector including a first connector portion having an internal thread and a second connector portion having a threaded portion connected to the first connector portion (also referred to as a male connector). In the medical connector of this document, the first connector portion and the second connector portion are connected by screwing together an internal thread disposed around the first connector portion and a thread formed on the outer peripheral surface of the second connector portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the medical connector described in Patent Document 1, even when the user recognizes that the first connector portion and the second connector portion are screwed together (connected), in reality, they are not screwed straight and may be connected in a state where they are easily disconnected. Therefore, there is room for improvement in making the user perceive that the connection state (screwed state) is stable.

[0005] The present invention has been made in view of the above problems, and provides a medical connector and a treatment tool for coronary artery bypass surgery that enable the user to perceive that the connection state is stable.

Means for Solving the Problems

[0006] The present invention relates to a medical connector comprising a first connector portion and a second connector portion connected to the first connector portion, wherein the second connector portion has an engaging screw portion that screws into an engaging recess formed on the inner circumferential surface of the first connector portion, the first connector portion is connected to the second connector portion by screwing, and is equipped with a notification mechanism that indicates the connection between the first connector portion and the second connector portion in a manner that can be detected by touch and / or hearing, the first connector portion has a projection, and the second connector portion is provided with a connection path through which the projection passes when connected to the first connector portion, on the connection path A housing portion is provided for housing the projection, and the projection is pressed against the peripheral portion of the housing portion at an intermediate position in the connection path between the first connector portion and the second connector portion, and the pressing state by the peripheral portion is released at a position beyond the intermediate position in the connection path and the projection is housed in the housing portion, thereby functioning as the notification mechanism, the projection is provided on the end face facing the second connector portion, the housing portion is provided on the end face facing the first connector portion, and the engagement screw portion advances through the engagement recess so that the end face of the second connector portion approaches the end face of the first connector portion and the projection 、 In side view The end face of the first connector portion is formed to serve as the base. right triangle shape Having The angle of the portion of the projection that is on the rear side in the relative direction of travel when the projection rotates to connect to the second connector portion, with respect to the end face of the first connector portion, The right angle of the aforementioned right-angled triangle, and The projection is formed at an angle greater than the angle of the portion facing forward in the direction of travel, and the housing portion is, in side view The end face of the second connector portion is formed to have one long side. rectangle This constitutes the longer side of the rectangle in the housing section. The length dimension is the projection The base of the right-angled triangle Larger than the length dimension, The shorter side of the rectangle in the housing section The length dimension is the projection The height of the right-angled triangular shape in Larger than the length dimension Furthermore, the first connector portion rotates relative to the second connector portion so that the projection engages with the housing portion, and the first connector portion can be rotated to move the projection in the direction of travel within the housing portion. This invention provides a medical connector characterized by the following features.

[0007] Furthermore, the present invention comprises a flexible tube, a joint portion having a suction passage and connectable to the flexible tube, and a cap connectable to a detachable connector portion of the flexible tube, wherein the flexible tube has a suction cup portion at its distal end having an opening communicating with the flexible tube, the flexible tube is configured to be connectable to the joint portion when the connection with the cap is released, the cap has an engaging screw portion that screws into an engaging recess formed on the inner circumferential surface of the detachable connector portion, the detachable connector portion is connected to the cap by screwing, and the invention includes a notification mechanism that indicates, by touch and / or hearing, that the flexible tube and the cap are connected. The detachable connector portion has a projection, the cap is provided with a connection path through which the projection passes when connecting to the detachable connector portion, and a housing portion is provided on the connection path to accommodate the projection, the projection presses against the peripheral portion of the housing portion at an intermediate position in the connection path between the detachable connector portion and the cap, and the press-fit state by the peripheral portion is released at a position beyond the intermediate position in the connection path and the projection is housed in the housing portion, thereby functioning as the notification mechanism, the projection is provided on the end face facing the cap, the housing portion is provided on the end face facing the detachable connector portion, the engaging screw portion screws into the engaging recess so that the end face of the cap approaches the end face of the detachable connector portion and the projection 、 In side view The end face of the detachable connector portion is formed to serve as the base. right triangle shape It has, The angle of the portion of the projection that is on the rear side in the relative direction of travel when the projection rotates to connect to the cap, with respect to the end face of the detachable connector portion, The right angle of the aforementioned right-angled triangle, and The projection is formed at an angle greater than the angle of the portion facing forward in the direction of travel, and the housing portion is, in side view The end face of the cap is formed to have one long side. rectangle o , The longer side of the rectangle in the aforementioned storage section The length dimension is the projection The base of the right-angled triangle Larger than the length dimension, The shorter side of the rectangle in the housing section The length dimension is the projection The height of the right-angled triangular shape in Larger than the length dimension The detachable connector portion rotates relative to the cap, causing the projection to engage with the housing portion, and further rotation of the detachable connector portion allows the projection to move in the direction of travel within the housing portion. This invention provides a surgical instrument for coronary artery bypass surgery characterized by the following features.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide a medical connector and a treatment tool for coronary artery bypass surgery that enable a user to sense that the connection state is stable.

Brief Description of the Drawings

[0009] [Figure 1] It is a schematic overall view of a treatment tool for coronary artery bypass surgery according to the present embodiment. [Figure 2] It is a schematic diagram of a joint part. [Figure 3] It is a schematic diagram of a part for a treatment tool. [Figure 4] It is an enlarged view of a detachable part. [Figure 5] It is a perspective view showing the appearance of a detachable part. [Figure 6] It is a cross-sectional view showing the cross-section of a detachable part. [Figure 7] It is an explanatory diagram for explaining the state when a cap is connected to a detachable connector. (a) is a diagram showing the state before these are connected, and shows a state where the protrusion of the detachable connector abuts on the end face of the cap (the peripheral part of the housing part). (b) is a diagram showing the state after these are connected, and shows a state where the protrusion of the detachable connector is accommodated in the housing part of the cap. [Figure 8] It is a schematic diagram showing a subject for explaining an example of a treatment using the treatment tool for coronary artery bypass surgery according to the present embodiment. [Figure 9] It is an explanatory diagram for explaining the state when a cap is connected to a detachable connector according to the second embodiment. (a) is a diagram showing the state before these are connected. (b) is a diagram showing the state after covering the cap on the detachable connector from the state of (a). (c) is a diagram showing the state after rotating the cap in the circumferential direction with respect to the detachable connector from the state of (b).

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0011] 〔First Embodiment〕 The first embodiment will be described with reference to FIGS. 1 to 8. <Overview> First, an overview of the medical connector 200 and the treatment tool 100 for coronary artery bypass surgery according to the embodiments of the present invention will be described. As shown in FIGS. 4 to 6, the medical connector 200 according to the present embodiment includes a first connector portion (detachable connector 50) and a second connector portion (cap 70) connected to the detachable connector 50. The medical connector 200 includes a notification mechanism IN that indicates in a way that the connection between the detachable connector 50 and the cap 70 can be sensed by touch and / or hearing.

[0012] Although details will be described later, as shown in FIG. 7, the notification mechanism IN according to the present embodiment is composed of a protrusion 50b of the detachable connector 50, a peripheral portion 70e of the accommodating portion 70d that presses against the protrusion 50b, and an accommodating portion 70d that accommodates the protrusion 50b at a position ahead of the peripheral portion 70e (the position shown in FIG. 7(b)).

[0013] With this notification mechanism IN, the user (surgeon) can tactilely feel that the cap 70 has rotated until the protrusion 50b reaches the accommodating portion 70d on the connection path 70b. Also, at this time, the user (surgeon) can aurally feel that the cap 70 has rotated until the protrusion 50b reaches the accommodating portion 70d of the connection path 70b due to the sound generated by the collision between the detachable connector 50 and the cap 70.

[0014] As shown in FIG. 1, the treatment tool 100 for coronary artery bypass surgery according to the present embodiment includes a flexible tube 11, a joint portion 20 having a suction path 21 and connectable to the detachable connector 50 of the flexible tube 11, and a cap 70 connectable to the detachable connector 50 of the flexible tube 11. The flexible tube 11 has a suction cup portion 12 at its distal end 11a, which has an opening 12a (see Figure 3) communicating with the flexible tube 11. The flexible tube 11 is configured to be connectable to the joint-side connector 40 of the joint portion 20 (see Figure 2) when it is disconnected from the cap 70.

[0015] The coronary artery bypass surgery instrument 100 is equipped with a notification mechanism IN (see Figure 7) that indicates, by touch and / or hearing, that the flexible tube 11 and the cap 70 have been connected. According to the above configuration, similar to the medical connector 200 described above, the user can confirm by touch and / or hearing that the flexible tube 11 and the cap 70 are connected by the notification mechanism IN. Furthermore, the present invention is not limited to medical connectors used in coronary artery bypass surgery devices 100, but is applicable to medical connectors in general.

[0016] The cap 70 has a soft cover 71 and an insertion projection 72 that protrudes from the soft cover 71. As shown in Figure 6, the detachable connector 50 has a hollow housing portion 52 that accommodates the insertion projection 72. An engagement screw portion 72a is formed on one of the outer circumferential surfaces of the insertion projection 72 and the inner circumferential surface 54 of the housing portion 52, and an engagement recess 56 is formed on the other. Then, the cap 70 and the detachable connector 50 are connected by screwing the engaging screw portion 72a and the engaging recess 56 together.

[0017] Furthermore, as shown in Figure 1, the coronary artery bypass surgery instrument 100 according to this embodiment is equipped with the medical connector 200 according to this embodiment. Furthermore, the individual components of the medical connector 200 and the coronary artery bypass surgery instrument 100 according to this embodiment do not need to be independent entities. It is permissible for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be part of another component, for a part of one component to overlap with a part of another component, and so on.

[0018] <Details> The embodiment will be described in more detail below. (Procedural instruments for coronary artery bypass surgery) First, the coronary artery bypass surgery instrument 100 will be described as a whole, mainly referring to Figures 1 to 3. Figure 1 is a schematic overall view of the coronary artery bypass surgery instrument 100 according to this embodiment, Figure 2 is a schematic view of the joint portion 20, and Figure 3 is a schematic view of the instrument component 10.

[0019] As shown in Figure 1, the coronary artery bypass surgery instrument 100 is used in off-pump coronary artery bypass surgery to move the heart 94 to a desired position. The coronary artery bypass surgery instrument 100 comprises, for example, a plurality (e.g., three) instrument components 10, a joint 20, and a suction source 30. Of these, the treatment instrument component 10 is equipped with a medical connector 200. Therefore, the coronary artery bypass surgery treatment instrument 100 is also equipped with a medical connector 200.

[0020] A suction tube 31 is led out from the suction source 30. The distal end of the suction tube 31 is connected to the proximal end of the joint 20 (the proximal end of the main tube 22, which will be described below).

[0021] (Joint section) As shown in Figure 2, the joint section 20 comprises, for example, a main pipe 22 and multiple (for example, three) sub-pipes 23 that branch off from the distal end of the main pipe 22 (for example, branching into three). The main pipe 22 is a tubular member through which gas can flow from its distal end to its proximal end. Furthermore, the sub-pipe 23 is a tubular member through which gas can flow from its distal end to its proximal end. The proximal end of each branch pipe 23 is in communication with the distal end of the main pipe 22. Therefore, a series of suction passages 21 are formed in the joint section 20, extending from the proximal end of the main pipe 22 to the distal end of each branch pipe 23. Each branch pipe 23 is provided with a three-way valve 24 for switching between an open state, which allows gas to flow through the branch pipe 23, and a closed state, which blocks the flow of gas within the branch pipe 23.

[0022] Each sub-pipe 23 has a distal end (i.e., the distal end of the joint section 20) equipped with a joint-side connector 40, which communicates with the suction passage 21. In other words, the joint-side connector 40 is located at the distal end of the suction passage 21 of the joint section 20.

[0023] As shown in Figure 2, the joint-side connector 40 comprises a male lure 43 protruding from its end and a cylindrical portion 44 arranged around the male lure 43. A spiral threaded portion (not shown) is formed on the inner circumferential surface of the cylindrical portion 44. In other words, the cylindrical portion 44 has a female thread shape.

[0024] (Parts for medical instruments) As shown in Figure 3, the treatment device component 10 includes, for example, a flexible tube 11, a suction cup portion 12 provided at the distal end 11a of the flexible tube 11, and a detachable connector 50 provided at the proximal end 11b of the flexible tube 11. As shown in Figure 3, the coronary artery bypass surgery instrument 100 (instrument component 10) comprises a cap 70 and a flexible linear body 60 that can be connected to the distal end 11a of the flexible tube 11 and the cap 70.

[0025] For example, a connecting member 13 is integrally formed on the suction cup portion 12. The suction cup portion 12 is provided on the distal end 11a of the flexible tube 11 via the connecting member 13.

[0026] One end 60a of the linear body 60 is inserted into the connecting member 13, thereby fixing the one end 60a. In other words, in this embodiment, one end 60a of the linear body 60 is fixed to the distal end 11a of the flexible tube 11 via the connecting member 13, and is also fixed to the suction cup portion 12 via the connecting member 13.

[0027] The suction cup portion 12 is formed in a bowl shape and has an opening 12a (see Figure 3). It is also preferable that the inside of the suction cup portion 12 has an uneven surface, if necessary. The opening 12a of the suction cup portion 12 is in communication with the internal space of the flexible tube 11 via the internal space of the suction cup portion 12 and the internal space of the connecting member 13.

[0028] With the opening 12a of the suction cup portion 12 in contact with the living body's heart 94, the gas in the internal space of the suction cup portion 12 is drawn in by the suction source 30 through the internal space of the connecting member 13, the internal space of the flexible tube 11, the internal space of the detachable connector 50, the internal space of the joint portion side connector 40, the suction passage 21 inside the joint portion 20, and the suction tube 31, causing the suction cup portion 12 to adhere to the heart 94 (see Figure 8). In this state, the practitioner can maintain the heart 94 in the desired position by pulling the flexible tube 11 and the linear body 60 to hold the suction cup portion 12 in the desired position. The linear body 60 is used to adjust the position of the heart 94 by being pulled by the surgeon, and is solid in shape.

[0029] (cap) Next, the cap 70 and the detachable connector 50 that constitute the detachable part 150 will be described, mainly with reference to Figures 4 to 7. Figure 4 is an enlarged view of the detachable part 150. Figure 5 is a perspective view showing the external appearance of the detachable part 150, and Figure 6 is a cross-sectional view showing a cross-section of the detachable part 150. Figure 7 is an explanatory diagram illustrating the state when connecting the cap 70 to the detachable connector 50. Figure 7(a) shows the state before connection, where the projection 50b of the detachable connector 50 is in contact with the end face of the cap 70 (the peripheral part 70e of the housing part 70d). Figure 7(b) shows the state after connection, where the projection 50b of the detachable connector 50 is housed in the housing part 70d of the cap 70. In Figures 5 and 7, the illustration of the flexible cover 71, which will be described later, is omitted.

[0030] The cap 70 is designed to prevent bodily fluids from flowing into the flexible tube 11 from its proximal end 11b when the flexible tube 11 is passed through the body, while also minimizing invasiveness. The cap 70 is provided on the other end 60b side of the linear body 60 and can be connected to the proximal end 11b side (detachable connector 50) of the flexible tube 11, as shown in Figure 4. The first connector portion or the second connector portion (the second connector portion in this embodiment) is a cap 70. An insertion portion 71a (through hole) is formed in the circumferential surface 70a of the flexible cover 71 around the axis, and it penetrates radially from the inside to the outside of the flexible cover 71. The linear body 60 is led out from the inside of the flexible cover 71 to the outside through the insertion portion 71a.

[0031] At least one of the first connector section (detachable connector 50) or the second connector section (cap 70) comprises a flexible section (flexible cover 71) and a rigid section (insertion projection 72) provided on the mutual connection side (the other end side of the cap 70) of the flexible cover 71. The insertion projection 72 (and its flange portion 72b) is formed so as to separate the end face of the soft cover 71 from the other side of the detachable connector 50 or the cap 70. Specifically, the flange portion 72b in this embodiment is positioned distal to the distal end face of the flexible cover 71 in the axial direction of the cap 70, thereby separating the end face of the flexible cover 71 from the detachable connector 50. In other words, the detachable connector 50 and the flexible cover 71 are configured not to come into contact with each other due to the flange portion 72b.

[0032] According to the above configuration, the insertion projection 72, which is harder than the soft cover 71, separates the end face of the soft cover 71, thereby preventing the detachable connector 50 and the cap 70 from being elastically connected. Furthermore, by avoiding the resultant force of the elastic restoring force of the soft cover 71 and the torsional restoring force of the linear body 60 (described later), it is possible to prevent the screw engagement between the engaging screw portion 72a and the engaging recess 56 (described later) from loosening and the detachable connector 50 and the cap 70 from coming off.

[0033] For example, in this embodiment, the cap 70 comprises a flexible portion (flexible cover 71) and a rigid portion (insertion projection 72) provided on the proximal end 11b side of the flexible tube 11, relative to the flexible cover 71. The end of the flexible cover 71 opposite the insertion projection 72 is formed in a tapered shape.

[0034] As shown in Figure 6, the insertion projection 72 is inserted into and connected to the detachable connector 50, and is a projection formed to protrude in one direction (distal direction) from the flexible cover 71. The flexible cover 71, the proximal end of the insertion projection 72, the flange portion 72b, and the other end 60b of the linear body 60 are bonded together with an adhesive containing an organic solvent such as cyclohexanone.

[0035] A linear notch 72d is formed at the proximal end of the insertion projection 72 for passing the linear body 60 through. The linear notch 72d has a U-shaped cross-section and extends diagonally toward the proximal side with respect to the axial direction of the insertion projection 72, continuously from the portion of the soft cover 71 facing the insertion portion 71a. The linear notch 72d thus formed forms a accommodating space between itself and the inner wall surface of the soft cover 71, along the other end 60b (proximal end) of the inserted linear body 60.

[0036] In this way, the linear notch 72d is formed, which limits the area where the adhesive remains, thereby preventing the adhesive from remaining in areas without the linear body 60. In other words, the space between the linear notch 72d and the other end 60b of the linear body 60 is suitable for bonding the linear body 60 to the insertion projection 72 with the adhesive. As shown in Figures 6 and 7, an engaging screw portion 72a is formed on the outer circumferential surface of the insertion projection 72, which engages with an engaging recess 56 formed on the inner circumferential surface 54 of the detachable connector 50.

[0037] As shown in Figure 7, the second connector portion (cap 70) is provided with a connection path 70b through which the projection 50b passes when connecting to the detachable connector 50, which will be described later, and a housing portion 70d for accommodating the projection 50b, which will be described later, is provided on the connection path 70b. The "connection path 70b" is the route along which the projection 50b moves relative to the cap 70 when connecting the cap 70 to the detachable connector 50, and is the route leading to the housing portion 70d.

[0038] In this embodiment, the housing portion 70d is provided on the end face (distal end face 70g) facing the first connector portion (detachable connector 50). In other words, the housing portion 70d is arranged such that its open side faces the distal end face 70g of the detachable connector 50.

[0039] The rigid portion (insertion projection 72) of the cap 70 is formed so as to separate the end face of the flexible portion (flexible cover 71) from the distal end 11a (detachable connector 50) of the flexible tube 11, and has a flange portion 72b at its distal end that is larger in diameter than other parts. The flange portion 72b has a through portion 72c formed therein for passing the other end 60b of the linear body 60 through. In other words, the flange portion 72b is not formed to encircle the entire cap 70, but is partially cut out by the through portion 72c, forming a C-shape in an axial view.

[0040] As described above, since a through-hole 72c for passing the linear body 60 is formed in the flange portion 72b, even if the linear body 60 is placed near the flange portion 72b, it is possible to prevent the linear body 60 from riding up onto it. Therefore, the area around the cap 70 can be made compact, and the invasiveness when passing it through the body can be reduced.

[0041] The housing portion 70d in this embodiment is a groove formed in a fan shape in an axial view, cut out from the distal end face of the flange portion 72b towards the proximal side and radially inward from the circumferential surface. In other words, the edge surface 70f, which is the side wall of the housing portion 70d, lies on a virtual straight line that extends radially from the axis in an axial view, and is formed to extend in the axial direction. Furthermore, in this embodiment, the housing portion 70d is formed in two locations at positions offset by 180 degrees from the axis. Note that the number of housing portions 70d should be equal to the number of projections 50b described later.

[0042] (Detachable connector) Next, the detachable connector 50 that constitutes the detachable section 150 will be described. The detachable connector 50 is formed in a tubular shape overall. That is, a through hole 50a (see Figure 6) is formed from one end to the other of the detachable connector 50. A portion of the detachable connector 50 in the axial direction (the axial direction of the through hole 50a) constitutes the housing portion 52.

[0043] An opening 53 is formed at one end 52a of the housing section 52. The insertion projection 72 of the cap 70 is inserted into the housing section 52 through this opening 53. A spiral-shaped engaging recess 56 (spiral groove) is formed on the inner circumferential surface 54 of the housing portion 52. The engaging recess 56 is formed on the outer circumferential surface of the insertion projection 72 so as to be able to screw into the engaging threaded portion 72a. The detachable connector 50 and the cap 70 are detachably connected when the engaging recess 56 of the housing portion 52 and the engaging screw portion 72a of the insertion projection 72 are screwed together.

[0044] However, the present invention is not limited to this example, and may be configured such that an engaging recess 56 is formed on the outer circumferential surface of the insertion projection 72, while an engaging screw portion 72a is formed on the inner circumferential surface 54 of the housing portion 52, and the detachable connector 50 and the cap 70 are connected by screwing the engaging recess 56 and the engaging screw portion 72a together.

[0045] In this manner, the insertion projection 72 is inserted through the opening 53 formed at one end 52a of the housing portion 52. Furthermore, a second engagement screw portion 58 (see Figure 5) is formed near one end 52a of the housing portion 52 on the outer circumferential surface of the housing portion 52. This second engagement screw portion 58 allows the detachable connector 50 to be connected to the joint-side connector 40 as well. Specifically, a threaded portion (not shown) formed on the inner circumferential surface of the cylindrical portion 44 of the joint-side connector 40 is screwed into the second engagement screw portion 58 of the housing portion 52. The male lure 43 (see Figure 2) of the connector 40 on the joint side is formed in a shape that fits into the housing 52.

[0046] The first connector portion (detachable connector 50) has a projection 50b. The projection 50b presses against the peripheral portion 70e of the housing portion 70d at an intermediate position 70c of the connection path 70b between the detachable connector 50 and the cap 70. Beyond the intermediate position 70c of the connection path 70b, the press-fit state by the peripheral portion 70e is released, and the projection 50b is housed within the housing portion 70d, thereby functioning as the notification mechanism IN described later.

[0047] Specifically, as the engaging screw portion 72a shown in Figure 6 is screwed into the engaging recess 56, the cap 70 moves closer to the detachable connector 50, and the peripheral portion 70e (distal end face 70g) of the housing portion 70d of the cap 70 comes into contact with the projection 50b and then moves closer, causing the two to press against each other. Then, the projection 50b, which was pressed against the peripheral portion 70e of the housing portion 70d, is released from the press-fit state and is housed within the housing portion 70d, causing the cap 70 and the detachable connector 50 to move in a direction toward each other. Here, "release of the press-fit state" is not limited to a state in which there is no pressing force at all, but also includes a state in which the pressing force is reduced. Therefore, the user (operator) can sense by touch that the cap 70 has rotated to a position where the projection 50b reaches the housing portion 70d of the connection path 70b, based on the change in the speed of proximity between the cap 70 and the detachable connector 50 or the change in resistance (friction).

[0048] As shown in Figures 5 and 7, the projection 50b is provided on the end face (proximal end face 50c) facing the second connector portion (cap 70). More specifically, the projection 50b is formed to protrude axially proximally from the proximal end face 50c of the detachable connector 50. As described above, the housing portion 70d is provided on the distal end face 70g facing the detachable connector 50, and the projection 50b is provided on the end face facing the cap 70, so that the state in which the projection 50b is housed in the housing portion 70d and the state in which it is not housed can be visually confirmed.

[0049] The projection 50b, together with the peripheral portion 70e of the housing portion 70d with which it abuts, and the engaging recess 56 and engaging screw portion 72a that screw into each other, constitute the notification mechanism IN. The projection 50b is formed in a triangular shape when viewed from the side, and in this embodiment, two projections 50b are formed. The two projections 50b are formed point-symmetric with respect to the center point when viewed from above (in the axial direction), and line-symmetric with respect to the central axis when viewed from the side.

[0050] Furthermore, the projections 50b according to the present invention are not limited to being provided in pairs. In other words, there should be multiple projections 50b arranged in the circumferential direction of the detachable connector 50. Similarly, there should be at least the same number of housing portions 70d as the number of projections 50b, and they should be provided in the circumferential direction of the cap 70 at the same intervals as the projections 50b.

[0051] With this configuration, when the detachable connector 50 and the cap 70 are rotated relative to each other and screwed together, each projection 50b can contact the distal end face 70g of the cap 70 (see Figure 7; peripheral portion 70e of the housing portion 70d) at the same time, and can be housed in the housing portion 70d at the same time. Therefore, when the engaging screw portion 72a and the engaging recess 56 (see Figure 6) are screwed together, it is possible to prevent them from connecting at an angle and hindering screwing.

[0052] In the projection 50b, when it rotates to connect to the cap 70, the angle between the proximal end face 50c and the portion that is relatively in front in the direction of travel is formed as an acute angle. At this time, the angle between the proximal end face 50c and the portion that is relatively in rear in the direction of travel is formed as a larger angle (90 degrees in this embodiment) than the angle of the portion that is in front.

[0053] When the projection 50b moves relative to the first connector part (detachable connector 50) and the second connector part (cap 70) in a direction that loosens the connection, the projection 50b is configured to be able to come into contact with the edge surface 70f of the housing part 70d. In particular, the edge surface 70f of the housing portion 70d is formed perpendicular to the circumferential direction of the cap 70. Therefore, when the projection 50b comes into contact with the edge surface 70f and receives a resistive force from the edge surface 70f, the component force of that resistive force does not occur in the axial direction perpendicular to the circumferential direction, and does not act on the projection 50b in a direction that would cause it to overcome the edge surface 70f.

[0054] In this embodiment, the cap 70 is rotated circumferentially relative to the cap to screw the engaging screw portion 72a into the engaging recess 56 of the detachable connector 50. One end 60a of the linear body 60 is connected to the other end of the flexible tube 11 via a connecting member 13, and the other end 60b of the linear body 60 is fixed to the cap 70. Therefore, when the cap 70 is rotated relative to the flexible tube 11, the linear body 60 is twisted, and a torsional moment (torque) is generated in the linear body 60 in the direction that restores the twist. Even if torque is generated in this way, if the contact state between the projection 50b and the edge surface 70f of the housing portion 70d can be maintained as described above, the loosening of the engagement (connection) between the engaging screw portion 72a (cap 70) and the engaging recess 56 (detachable connector 50) can be limited. In other words, the mating strength can be increased.

[0055] (The function of the notification mechanism) As shown in Figure 7, the notification mechanism IN consists of a projection 50b on the detachable connector 50, a peripheral portion 70e of the housing portion 70d that presses against the projection 50b at an intermediate position 70c (the position shown in Figure 7(a)) of the connection path 70b for connecting the detachable connector 50 and the cap 70, and a housing portion 70d that accommodates the projection 50b at a position beyond the intermediate position 70c (the position shown in Figure 7(b)) where the press-fit state by the peripheral portion 70e is released.

[0056] At an intermediate position 70c of the connection path 70b, the frictional force applied when screwing the cap 70 onto the detachable connector 50 by pressing the projection 50b against the peripheral portion 70e is eliminated when the projection 50b is housed in the housing portion 70d. As described above, when the projection 50b is housed in the housing portion 70d, the cap 70 and the detachable connector 50 move in a direction that brings them closer together. The user (operator) can sense by touch that the cap 70 has rotated to a position where the projection 50b reaches the housing portion 70d of the connection path 70b, based on a change in the speed of proximity or a change in resistance between the cap 70 and the detachable connector 50.

[0057] Furthermore, at this time, a "click" sound is produced when the surface of the detachable connector 50 facing the cap 70 and the surface of the cap 70 (peripheral portion 70e) facing the detachable connector 50 collide. Therefore, the user (operator) can perceive by hearing the impact sound that the cap 70 has rotated to a position where the projection 50b reaches the housing portion 70d of the connection path 70b.

[0058] For example, the notification mechanism IN may notify the user that the detachable connector 50 and the cap 70 have been connected solely through touch. In other words, if the user can sense the change in frictional force, then, for example, if at least one of the surfaces of the detachable connector 50 facing the cap 70 and the surface of the cap 70 facing the detachable connector 50 is formed of a cushioning material, then no sound may be produced when they collide.

[0059] For example, the notification mechanism IN may notify the user that the detachable connector 50 and the cap 70 have been connected, solely through auditory means. In other words, if the user can perceive the aforementioned collision sound, then, for example, if the pressure force between the projection 50b and the peripheral portion 70e is small, the change in frictional force between the intermediate position 70c in contact with the peripheral portion 70e and the position where it is housed in the housing portion 70d may be small enough that the user cannot perceive it. With this configuration, the user can confirm by touch and / or hearing that the first connector part (detachable connector 50) and the second connector part (cap 70) are connected, thanks to the notification mechanism IN.

[0060] As described above, the two protrusions 50b are formed point-symmetric with respect to the center point in a plan view (axial view), and line-symmetric with respect to the central axis in a side view. This arrangement allows the pressure load between the protrusions 50b and the peripheral portion 70e of the housing portion 70d to be distributed among multiple points, while simultaneously allowing the protrusions 50b to be retracted into the housing portion 70d at the same time. As a result, the detachable connector 50 and the cap 70 are not connected in an inclined position. Note that the number of protrusions 50b is not limited to two, and more may be provided.

[0061] Furthermore, as described above, when the cap 70 is rotated in the connection direction, the angle of the projection 50b with respect to the proximal end face 50c of the portion that is relatively in front of the direction of travel is formed as an acute angle, and the angle of the portion that is in rear of this direction with respect to the proximal end face 50c is formed as a larger angle (90 degrees in this embodiment) than the angle of the portion that is in front.

[0062] When the cap 70 rotates in the opposite direction from the state in which it is housed in the housing 70d (see Figure 7(b)), the projection 50b formed in this manner will come into contact with the edge surface 70f of the housing 70d at a point perpendicular (including approximately perpendicular) to the direction of rotation on the front side in the reverse direction (in other words, the rear side in the direction of travel). This prevents the projection 50b from unintentionally falling out of the housing 70d and improves the connection strength (fitting strength) between the detachable connector 50 and the cap 70.

[0063] When intentionally removing the cap 70 from the detachable connector 50, the detachable connector 50 and the cap 70 should be pulled away from each other while the cap 70 is rotated in the opposite direction relative to the detachable connector 50, so that the projection 50b moves over the edge surface 70f.

[0064] As described above, a projection 50b having a triangular shape in side view and the above-mentioned angle (especially a right-angled triangle) is preferable in that it can improve the connection strength between the detachable connector 50 and the cap 70, but the configuration is not limited to this. Furthermore, it is preferable that the projection 50b has a trapezoidal shape in side view, and that when connecting the detachable connector 50 and the cap 70, a portion of the front side in the rotational direction has a surface that is inclined with respect to the rotational direction (a surface that is inclined at an acute angle with respect to the proximal end face 50c). However, the projection 50b is not limited to this configuration, and a curved portion may be included in part.

[0065] In the above description, the notification mechanism IN, which includes a projection 50b and a housing portion 70d, was described as having the projection 50b provided on the detachable connector 50 side and the housing portion 70d provided on the cap 70 side. However, the present invention is not limited to this configuration. In other words, it is sufficient if a projection 50b is provided on one of the opposing end faces of the detachable connector 50 and the cap 70, and a housing portion 70d is provided on the other.

[0066] The above configuration is preferable because, since the projection 50b and the cap 70 are provided on their opposing end faces, it is possible to suppress the radial increase in the size of the detachable connector 50 or the cap 70 in order to arrange them. However, the present invention is not limited to this configuration.

[0067] For example, a configuration may be provided in which a projection 50b is provided on one of the "opposing circumferential surfaces" of the detachable connector 50 and the cap 70, and a housing portion 70d is provided on the other. In other words, the projection 50b may protrude radially from either the detachable connector 50 or the cap 70, and the housing portion 70d may be formed as a radial recess on the other of the detachable connector 50 or the cap 70 along the connection path of the projection 50b when the cap 70 is screwed in.

[0068] (material) Examples of materials for each component of the coronary artery bypass surgery instrument 100 will be described. The auxiliary pipe 23, the flexible tube 11, and the linear body 60 are made of, for example, a soft resin, and are flexible and can be bent flexibly. The suction cup portion 12 is made of, for example, a soft resin. The three-way valve 24, the joint-side connector 40, and the detachable connector 50 are each made of, for example, a rigid resin. The connecting member 13 is made of, for example, resin (hard resin or soft resin).

[0069] The soft cover 71 of the cap 70 is made of, for example, a soft resin (soft polyvinyl chloride), and the insertion projection 72 is made of, for example, a hard resin (hard polyvinyl chloride). In particular, it is preferable that the cap 70 contains barium sulfate or other contrast agent. Thus, because the cap 70 contains a contrast agent, its position becomes clear when irradiated with X-rays, making it easier to grasp the cap 70 with forceps (not shown) and pull it out through the small incision 95 (see Figure 8), which will be described later. Furthermore, it is preferable that the rigid insertion projection 72 contains barium sulfate. With the above configuration, when inserting the cap 70 into the body, the position of the cap 70 can be determined by irradiating it with X-rays to visualize it, making the procedure easier.

[0070] (Treatment) Next, with reference to Figures 1 to 3 and Figure 8, an example of a procedure using the coronary artery bypass surgery instrument 100 will be described. Figure 8 is a schematic diagram showing a subject 92 for illustrating an example of a procedure using the coronary artery bypass surgery instrument 100 according to this embodiment.

[0071] As shown in Figure 8, an incision 93, which is an opening reaching the thoracic cavity 96, is formed in the chest wall 97 of a subject 92 such as a human body, and the heart 94 is exposed to the outside. On the other hand, several small incisions 95 smaller than the incision 93 are formed in the chest wall 97 around the incision 93. The number of small incisions 95 can be equal to the number of instrument components 10 provided by the coronary artery bypass surgery instrument 100, for example, three in this embodiment.

[0072] Next, the instrument component 10, which is separated from the joint 20 and has a detachable connector 50 and a cap 70 connected to each other, is passed through the opening 93 and positioned near the small incision 95 in the thoracic cavity 96.

[0073] Next, the tip of a forceps (not shown) is inserted into the thoracic cavity 96 from the outside of the subject 92 through a small incision 95, and the tip of the soft cover 71 of the cap 70 is grasped with the forceps. Then, by pulling the forceps, the attachment / detachment part 150 (cap 70 and attachment / detachment connector 50), the linear body 60, and a portion of the flexible tube 11 are pulled out of the body from the thoracic cavity 96 through the small incision 95. In this state, the suction cup part 12 and the connecting member 13 side of the treatment instrument component 10 are located inside the thoracic cavity 96. The suction cup part 12 is positioned near the desired suction site on the heart 94.

[0074] Next, the cap 70 is separated from the detachable connector 50. Then, outside the subject 92, the detachable connector 50 is connected to the joint-side connector 40 of the joint 20. This process is repeated for each treatment instrument component 10. As a result, each of the joint-side connectors 40 of the joint section 20 is connected to the treatment tool component 10 (see Figure 1). Subsequently, the suction cup portion 12 of each treatment instrument component 10 is placed against the desired suction site on the heart 94, and the suction source 30 is activated to cause each suction cup portion 12 to adhere to the heart 94. In this way, the heart 94 can be held in the desired position. After that, coronary artery bypass surgery can be performed.

[0075] With the above configuration, each treatment instrument component 10 can be separated from the joint 20, allowing each treatment instrument component 10 to be handled individually. Furthermore, each treatment instrument component 10 can be inserted into the pleural cavity 96 through the attachment / detachment section 150, and after the cap 70, attachment / detachment connector 50, linear body 60, and flexible tube 11 are pulled out of the pleural cavity 96 through each small incision 95 using forceps or the like, the treatment instrument component 10 can be connected to the joint 20. Therefore, the attachment / detachment portion 150 of each treatment instrument component 10, the flexible tube 11, and a portion of the linear body 60 can be pulled out from the corresponding small incision 95.

[0076] Therefore, the flexible tube 11 and linear body 60 can be avoided when positioning each suction cup 12 in the desired location and during subsequent coronary artery bypass surgery. Therefore, even if the incision 93 is made more compact than in conventional methods, coronary artery bypass surgery and its preparation (such as the placement of the suction cup portion 12) can be performed smoothly, thereby reducing the burden on the body.

[0077] In the above embodiment, the cap 70 was described as being rotated relative to the detachable connector 50 and connected by screwing, but the present invention is not limited to this configuration. In other words, it is sufficient that the detachable connector 50 and 70 can rotate relative to each other, and the two may be connected by rotating the detachable connector 50 relative to the cap 70.

[0078] [Second Embodiment] Finally, with reference to Figure 9, the attachment / detachment portion 150X of the medical connector 200X according to the second embodiment will be described. Figure 9 is an explanatory diagram illustrating the state when connecting the cap 70X to the detachable connector 50X according to the second embodiment. Figure 9(a) shows the state before connection, Figure 9(b) shows the state after the cap 70X is placed over the detachable connector 50X from the state in Figure 9(a), and Figure 9(c) shows the state after the cap 70X is rotated circumferentially relative to the detachable connector 50X from the state in Figure 9(b).

[0079] The medical connector 200X according to this embodiment comprises a first connector portion (detachable connector 50X) and a second connector portion (cap 70X) connected to the first connector portion. The detachable connector 50X according to this embodiment is provided with a cylindrical projection 50e that protrudes radially outward on the proximal end side of its outer circumferential surface.

[0080] The cap 70X has a connecting path 70i that guides the projection 50e to the housing 70k at its end. The connecting path 70i is formed with a width greater than the diameter of the projection 50e, and is an inverted L-shaped notch that extends from the distal end of the cap 70X toward the proximal end, then bends circumferentially, and penetrates in the thickness direction of the cap 70X. At the end of the connecting path 70i, two opposing elastic projections 70j are formed to narrow the connecting path 70i. For example, the elastic projections 70j are made of elastic rubber or resin.

[0081] When attaching the cap 70X configured in this way to the detachable connector 50X, the user first adjusts the relative position of the cap 70X and the detachable connector 50X so that the projection 50e is located on the extension of the connection path 70i, as shown in Figure 9(a).

[0082] Next, bring the cap 70X closer to the detachable connector 50X and pass the projection 50e through the connection path 70i, as shown in Figure 9(b). The user then rotates the cap 70X circumferentially relative to the detachable connector 50X, pushing in such a mechanism that the projection 50e elastically deforms the two elastic projections 70j. By applying a torque greater than a predetermined amount to the cap 70X, the elastic projection 70j overcomes the projection 50e and is housed in the accommodating section 70k, which is the space located at the end of the projection 50e.

[0083] In this way, the frictional load applied via the elastic projection 70j when the projection 50e makes contact is reduced as the projection 50e overcomes the elastic projection 70j, and the cap 70 moves with circumferential acceleration. As a result, the user can perceive, through the sound of impact and tactile sensation, that the cap 70 has rotated to a position where the projection 50e reaches the housing portion 70k of the connection path 70i, due to the change in the rotational speed of the cap 70.

[0084] At this time, a "click" sound is produced when the projection 50e collides with the wall surface that defines the end of the connection path 70i of the cap 70X. Therefore, the user can perceive by hearing that the cap 70X has rotated to a position where the projection 50e reaches the housing section 70k located on the connection path 70i. In other words, in this embodiment, the notification mechanism IN is composed of at least the projection 50e and the elastic projection 70j, or the projection 50e, the elastic projection 70j, and a wall surface defining the end of the connection path 70i.

[0085] The present invention is not limited to this configuration, and a projection 50e may be provided on the cap 70X side, and a connection path 70i and an elastic projection 70j may be provided on the detachable connector 50X side. Although each embodiment has been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted.

[0086] For example, the cap 70 and the linear body 60 shown in Figure 4 may be connected in a configuration that allows them to rotate axially relative to each other with the axial direction of the cap 70 as coaxial, while maintaining their mutual connection state. With this configuration, when the operator screws the engaging thread portion 72a of the cap 70 to attach the cap 70 to the detachable connector 50, twisting of the linear body 60 can be suppressed. In other words, it is possible to avoid generating a torsional moment in the linear body 60 that would cause it to return to its original state from being twisted, thereby making the connection between the cap 70 and the detachable connector 50 more stable. Furthermore, the above embodiments can be combined as appropriate without departing from the spirit of the present invention.

[0087] This embodiment encompasses the following technical concepts. (1) A medical connector comprising a first connector portion and a second connector portion connected to the first connector portion, A medical connector characterized by comprising a notification mechanism that indicates, in a manner that can be detected by touch and / or hearing, that the first connector portion and the second connector portion are connected. (2) The first connector portion has a protrusion, The second connector portion is provided with a connection path through which the projection passes when connecting to the first connector portion, and a housing portion is provided on the connection path for housing the projection. The medical connector according to (1), wherein the projection presses against the peripheral portion of the housing portion at an intermediate position in the connection path between the first connector portion and the second connector portion, and the press-fit state by the peripheral portion is released at a position beyond the intermediate position in the connection path, thereby housing within the housing portion and functioning as the notification mechanism. (3) The projection is provided on the end face facing the second connector portion, The medical connector as described in (2), wherein the housing portion is provided on the end face facing the first connector portion. (4) The medical connector according to (2) or (3), wherein the projection is configured to contact the edge surface of the housing when the projection moves relative to it in a direction that loosens the connection between the first connector portion and the second connector portion. (5) At least one of the first connector portion or the second connector portion comprises a flexible portion and a rigid portion provided on the connection side of the flexible portion, The medical connector according to any one of (1) to (4), wherein the rigid portion is formed so as to separate the end face of the soft portion from the other of the first connector portion or the second connector portion. (6) Either the first connector portion or the second connector portion is a cap, The cap is a medical connector according to any one of (1) to (5), containing a contrast agent. (7) Flexible tube and A joint portion having a suction passage and connectable to the flexible tube, The flexible tube comprises a cap that can be connected to the aforementioned flexible tube, The aforementioned flexible tube is The suction cup portion has an opening at its distal end that communicates with the aforementioned flexible tube, The flexible tube is configured to be connectable to the joint portion when the connection to the cap is released. A coronary artery bypass surgery instrument characterized by comprising a notification mechanism that indicates, in a manner that can be detected by touch and / or hearing, that the flexible tube and the cap have been connected. (8) The flexible tube further comprises a linear body connectable to the distal end and the cap, The cap is connectable to the proximal end of the flexible tube and comprises a soft portion and a hard portion located on the proximal end side of the flexible tube, The rigid portion has a flange portion formed so as to separate the end face of the flexible portion from the distal end of the flexible tube, The flange portion is formed with a passage for passing the linear body through it, as described in (7) for coronary artery bypass surgery instrument. [Explanation of Symbols]

[0088] 10. Parts for medical devices (medical equipment) 11 Flexible Tube 11a Distal end 11b Proximal end 12 Suction cup part 12a opening 13 Connecting member 20 Joint section 21 Suction channel 21a Distal end 22 Master 23 Secondary pipe 24 Three-way valve 30 Suction source 31 Suction tube 40. Joint side connector 43 Male Lures 44 Cylinder part 50, 50X Detachable Connector (First Connector Section) 50a through hole 50b protrusion 50c proximal end face 50e protrusion 52 Storage Unit 52a one end 53 Aperture 54 Inner peripheral surface 56 Engaging recess (spiral groove) 58 Second engagement thread section 60 linear body 60a One end 60b Other end side 70, 70X cap (second connector section) 70a circumferential surface 70b Connection Route 70c midway position 70d Storage compartment (position ahead) 70e Peripheral area 70f edge surface 70g distal end face 70i Connection Path 70j elastic protrusion 70k storage area 71. Soft cover (soft part) 71a Insertion part 72 Insertion projection (hard part) 72a Engaging thread portion 72b Flange section 72c Through section 72d Linear notch 92 Subjects 93 Retraction Department 94 Heart 95 Small incision hole 96 Thoracic cavity 97 Battlements 150, 150X detachable part 100 Coronary Artery Bypass Surgery Instruments 200, 200X Medical Connectors IN (Information about the notification system)

Claims

1. A medical connector comprising a first connector portion and a second connector portion connected to the first connector portion, The second connector portion has an engaging screw portion that engages with an engaging recess formed on the inner circumferential surface of the first connector portion, and the first connector portion is connected to the second connector portion by screwing. It is equipped with a notification mechanism that indicates, in a manner that can be detected by touch and / or hearing, that the first connector portion and the second connector portion are connected. The first connector portion has a protrusion, The second connector portion is provided with a connection path through which the projection passes when connecting to the first connector portion, and a housing portion is provided on the connection path for housing the projection. The projection presses against the peripheral portion of the housing portion at an intermediate position in the connection path between the first connector portion and the second connector portion, and the press-fitting state by the peripheral portion is released at a position beyond the intermediate position in the connection path, and the projection is housed within the housing portion, thereby functioning as the notification mechanism. The projection is provided on the end face facing the second connector portion, The housing portion is provided on the end face facing the first connector portion, As the engaging screw portion advances through the engaging recess, the end face of the second connector portion approaches the end face of the first connector portion. The projection has a right-angled triangular shape formed such that the end face of the first connector portion is the base when viewed from the side. The angle between the portion of the projection that is on the rear side in the relative direction of travel when the projection rotates to connect to the second connector portion and the end face of the first connector portion is the right angle of the right triangle and is formed at a larger angle than the angle of the portion of the projection that is on the front side in the direction of travel. The housing portion is a rectangle formed such that, in a side view, the end face of the second connector portion forms one of its long sides. The length of the longer side of the rectangle in the housing portion is greater than the length of the base of the right-angled triangular shape in the projection. The length dimension of the shorter side of the rectangle in the housing portion is greater than the length dimension corresponding to the height of the right-angled triangular shape in the projection. A medical connector in which the first connector portion rotates relative to the second connector portion so that the projection engages with the housing portion, and the first connector portion can be rotated to move the projection in the direction of travel within the housing portion.

2. The medical connector according to claim 1, wherein the projection is configured to contact the edge surface of the housing portion when the projection moves relative to it in a direction that loosens the connection between the first connector portion and the second connector portion.

3. At least one of the first connector portion or the second connector portion comprises a flexible portion and a rigid portion provided on the connection side of the flexible portion, The medical connector according to claim 1 or 2, wherein the rigid portion is formed so as to separate the end face of the soft portion from the other of the first connector portion or the second connector portion.

4. Either the first connector portion or the second connector portion is a cap, The medical connector according to any one of claims 1 to 3, wherein the cap contains a contrast agent.

5. Flexible tube and A joint portion having a suction passage and connectable to the flexible tube, The flexible tube comprises a cap that can be connected to the detachable connector portion, The aforementioned flexible tube is The suction cup portion has an opening at its distal end that communicates with the aforementioned flexible tube, The flexible tube is configured to be connectable to the joint portion when the connection to the cap is released. The cap has an engaging screw portion that engages with an engaging recess formed on the inner circumferential surface of the detachable connector portion, and the detachable connector portion is connected to the cap by screwing. The system includes a notification mechanism that indicates, in a manner that can be detected by touch and / or hearing, that the flexible tube and the cap are connected. The aforementioned detachable connector portion has a protrusion, The cap is provided with a connection path through which the projection passes when connecting to the detachable connector portion, and a housing portion is provided on the connection path for housing the projection. The projection presses against the peripheral portion of the housing portion at an intermediate position in the connection path between the detachable connector portion and the cap, and the pressure by the peripheral portion is released at a position beyond the intermediate position in the connection path, thereby housing the projection within the housing portion and functioning as the notification mechanism. The projection is provided on the end face facing the cap, The housing portion is provided on the end face facing the detachable connector portion, As the engaging screw portion advances through the engaging recess, the end face of the cap approaches the end face of the detachable connector portion. The projection has a right-angled triangular shape formed such that, in a side view, the end face of the detachable connector portion is the base. The angle between the portion of the projection that is on the rear side in the relative direction of travel when the projection rotates to connect to the cap and the end face of the detachable connector portion is the right angle of the right triangle and is formed at a larger angle than the angle of the portion of the projection that is on the front side in the direction of travel. The housing portion is a rectangle formed such that, in a side view, the end face of the cap forms one of its long sides. The length of the longer side of the rectangle in the housing portion is greater than the length of the base of the right-angled triangular shape in the projection. The length dimension of the shorter side of the rectangle in the housing portion is greater than the length dimension corresponding to the height of the right-angled triangular shape in the projection. A coronary artery bypass surgery instrument, wherein the detachable connector portion rotates relative to the cap so that the projection engages with the housing portion, and the detachable connector portion can be rotated to move the projection in the direction of travel within the housing portion.

6. The flexible tube further comprises a linear body connectable to the distal end and the cap, The cap is connectable to the proximal end of the flexible tube and comprises a soft portion and a hard portion located on the proximal end side of the flexible tube, The rigid portion has a flange portion formed so as to separate the end face of the flexible portion from the distal end of the flexible tube, The coronary artery bypass surgery instrument according to claim 5, wherein the flange portion has a through portion for passing the linear body through.

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