Surgical instrument

Abstract

A surgical instrument provided with a housing having an internal space, and a shaft extending from the housing, formed in a cylindrical shape, and communicating with the internal space, the housing having: a flushing port that is a through-hole through which a cleaning liquid flows from the outside into the housing; and at least one opening through which the cleaning liquid flows to the outside, the flushing port being disposed at a position where the central axis of the shaft is sandwiched between the flushing port and the at least one opening.

Description

Technical Field

[0001] The present disclosure relates to surgical instruments. Background Art

[0002] A surgical instrument is known, which includes a sleeve having an internal space, a cylindrical shaft extending from the sleeve, and an end effector such as forceps provided at a front end of the shaft. The surgical instrument is cleaned and sterilized before or after use.

[0003] As a method for cleaning surgical instruments, there is a method of using a cleaning liquid. For example, there is a method of cleaning by supplying a cleaning liquid to the inside of a sleeve or a shaft of a surgical instrument (for example, see Patent Document 1).

[0004] The cleaning liquid is supplied through a flushing port provided in the sleeve and a main flushing port different from the flushing port. The cleaning liquid supplied through the flushing port is supplied to the inside of the sleeve. The inside of the sleeve is cleaned using the cleaning liquid supplied from the flushing port.

[0005] The cleaning liquid supplied through the main flushing port is supplied to the inside of the shaft via a tube extending from the main flushing port. The tube is arranged inside the sleeve in a manner extending from the main flushing port to the inside of the shaft. The cleaning liquid supplied through the main flushing port and the tube cleans the inside of the shaft.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2021-186231 Summary of the invention

[0009] Problem that the invention aims to solve

[0010] The connecting portion connecting the sleeve and the shaft is open. In other words, the inner space of the sleeve and the inner space of the shaft are connected to each other. Most of the cleaning liquid after cleaning the inside of the sleeve will flow out to the outside of the sleeve. On the other hand, a part of the used cleaning liquid after cleaning the inside of the sleeve will flow from the inner space of the sleeve into the inner space of the shaft.

[0011] In most cases, the shaft is not provided with an opening for the cleaning liquid to flow out to the outside. In most cases, the cleaning liquid in the shaft flows out from the shaft through the sleeve to the outside. Therefore, the used cleaning liquid that flows from the sleeve into the shaft needs to return from the shaft to the sleeve and then flow out from the sleeve to the outside. Therefore, the time required to clean the surgical instrument is often long, and the cleaning efficiency is often reduced. In addition, hereinafter, the sleeve of the present disclosure is also referred to as a "housing".

[0012] The present disclosure discloses an example of a surgical instrument that is easy to suppress a decrease in cleaning efficiency.

[0013] Solutions to the problem

[0014] A surgical instrument in one embodiment of the present invention comprises: a shell having an internal space, and a shaft extending from the shell and formed in a cylindrical shape and connected to the internal space, the shell having: a flushing port, which is a through hole for a cleaning fluid to flow into the shell from the outside; and at least one opening portion, through which the cleaning fluid flows out to the outside, and the flushing port is arranged at the following position, with the central axis of the shaft sandwiched between the flushing port and the at least one opening portion.

[0015] According to the surgical instrument disclosed herein, the cleaning fluid flowing into the interior of the housing from the flushing port crosses the central axis of the shaft, so that it is easy to flow out from at least one opening to the outside of the housing. The flow direction of the cleaning fluid is the direction that crosses the central axis of the shaft. Among the components of the flow direction of the cleaning fluid, the component flowing toward the interior of the shaft is easy to be smaller than the component flowing toward at least one opening. In other words, the flow direction of the cleaning fluid is not easy to flow from the internal space of the housing toward the interior of the shaft.

[0016] In the surgical instrument according to one aspect of the present disclosure, it is preferable that the irrigation port be arranged so that an axis line of the irrigation port extends through a position different from the central axis line of the shaft.

[0017] According to the above configuration, the main flow direction of the cleaning liquid flowing from the flushing port along the axis into the housing is likely to be different from the direction toward the inside of the shaft. Therefore, the cleaning liquid supplied to the inside of the housing through the flushing port is not likely to flow from the internal space of the housing into the inside of the shaft. In the following, regarding the positional relationship between the flushing port and the shaft, the positional relationship in which the axis of the flushing port is extended in a manner that passes through a position different from the central axis of the shaft is also referred to as a torsional positional relationship.

[0018] In the surgical instrument according to one aspect of the present disclosure, it is preferable that the irrigation port is arranged in a region of the housing that is closer to the shaft than the at least one opening.

[0019] According to the above configuration, the component of the flow direction of the cleaning liquid flowing from the flushing port into the interior of the housing is likely to increase in the negative direction of the Z axis (the direction away from the shaft along the central axis of the shaft). The cleaning liquid is unlikely to flow from the interior space of the housing into the interior of the shaft.

[0020] A surgical instrument of one embodiment of the present invention comprises: a shell having an internal space, and an axis extending from the shell and formed in a cylindrical shape and connected to the internal space, the shell having a flushing port, which is a through hole for a cleaning liquid to flow into the shell from the outside, and the flushing port is arranged in an area closer to the axis than the center of the shell in the extension direction of the axis.

[0021] According to the surgical instrument disclosed herein, the main flow direction of the cleaning liquid supplied from the flushing port to the inside of the housing is likely to be toward the center of the housing. In other words, the cleaning liquid is likely to flow in a direction away from the axis. The cleaning liquid is unlikely to flow from the internal space of the housing into the inside of the axis.

[0022] In the surgical instrument according to one aspect of the present disclosure, it is preferable that the irrigation port is arranged so that an axis line of the irrigation port extends through a position different from a position where a central axis line of the shaft extends.

[0023] According to the above configuration, the main flow direction of the cleaning liquid flowing into the housing from the flushing port along the axis is likely to be different from the direction toward the inside of the shaft. The cleaning liquid is less likely to flow from the internal space of the housing into the inside of the shaft.

[0024] In a surgical instrument of one embodiment of the present disclosure, the shell preferably has at least one opening, and the cleaning fluid flows out to the outside through the at least one opening, and the at least one opening is preferably arranged at a position where the central axis of the shaft is sandwiched between the at least one opening and the flushing port.

[0025] According to the above configuration, the main flow direction of the cleaning liquid is likely to be the direction toward at least one opening. Therefore, the flow direction of the cleaning liquid is likely to be the direction that crosses the central axis of the shaft. Among the components of the flow direction of the cleaning liquid, the component that flows toward the inside of the shaft is likely to be smaller than the component that flows toward at least one opening. In other words, the flow direction of the cleaning liquid is not likely to flow from the internal space of the shell toward the inside of the shaft.

[0026] Effects of the Invention

[0027] According to the surgical instrument disclosed herein, since the flushing port is arranged at the following position, the central axis of the shaft is sandwiched between the flushing port and at least one opening portion, so the flow direction of the cleaning liquid is not easy to flow from the internal space of the shell toward the inside of the shaft, thereby achieving the effect of easily suppressing the decrease in cleaning efficiency.

[0028] According to the surgical instrument disclosed herein, since the flushing port is arranged in an area closer to the axis than the center of the shell in the extension direction of the axis, the flow direction of the cleaning liquid is not easy to flow from the internal space of the shell toward the inside of the axis, thereby achieving the effect of easily suppressing the decrease in cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view explaining the structure of the surgical instrument of the present disclosure.

[0030] Figure 2 Yes Description Figure 1A three-dimensional view of the external structure of the shell and the cover.

[0031] Figure 3 Yes Description Figure 1 A three-dimensional diagram of the internal structure of the cover.

[0032] Figure 4 Yes Description Figure 1 A three-dimensional diagram of the external structure of the base.

[0033] Figure 5 Yes Description Figure 1 A three-dimensional diagram of the internal structure of the base.

[0034] Figure 6 Yes Description Figure 1 A cross-sectional view of the internal structure of the shaft along the VI-VI line arrow.

[0035] Figure 7 It is a schematic diagram explaining the flow of cleaning fluid in a surgical instrument.

[0036] Figure 8 It is a schematic diagram explaining the flow of the cleaning liquid in the housing.

[0037] Fig. 9 It is a schematic diagram explaining the flow of the cleaning fluid in the shaft.

[0038] Fig.10 is a schematic diagram illustrating the flow of other cleaning fluids in surgical instruments.

[0039] Description of Reference Numerals

[0040] 1…surgical instrument; 10…housing; 16…irrigation port; 16L…axis; 26…tube; 27…opening; 40…axis; 40L…central axis DETAILED DESCRIPTION

[0041] Reference Figures 1 to 8 A surgical instrument 1 according to an embodiment of the present disclosure is described. The surgical instrument 1 in this embodiment is an instrument used for surgery and is an instrument mounted on a master-slave surgical robot. In addition, the surgical instrument 1 may also be mounted on a surgical robot other than a master-slave surgical robot. In addition, the surgical instrument 1 may also be an instrument not mounted on a surgical robot. Figures 1 to 8 The surgical robot is not shown.

[0042] The surgical instrument 1 of this embodiment is an instrument that is operated by a driving force transmitted from the outside. The driving force is generated by an external driving source such as an actuator, and is transmitted to the surgical instrument 1 via a transmission body such as a wire.

[0043] like Figure 1As shown, the surgical instrument 1 is provided with a housing 10 and a shaft 40. In addition, the surgical instrument 1 is provided with an end effector 50.

[0044] Hereinafter, description will be made using the X direction, Y direction, and Z direction described below. The X direction and the Y direction are directions extending along a plane orthogonal to the central axis 40L of the shaft 40, and are directions orthogonal to each other, wherein the central axis 40L of the shaft 40 extends along a plane orthogonal to the central axis 40L of the shaft 40. Figure 1 The plane perpendicular to the central axis 40L of the shaft 40 is Figure 1 The paper plane is orthogonal.

[0045] In other words, the X direction is a direction extending along the mounting surface 22 in the base 21 of the housing 10, and the positive direction of the X direction is relative to Figure 1 In other words, the positive direction of the Y direction is the direction from the base 21 of the housing 10 toward the cover 11. The Z direction is a direction parallel to the central axis 40L, and the positive direction of the Z direction is the direction from the housing 10 toward the end effector 50.

[0046] The housing 10 is a container having an internal space and is a portion of the surgical instrument 1 that is assembled to the surgical robot. Figure 2 As shown, the housing 10 has a cover 11 and a base 21 .

[0047] The cover 11 is a component that forms the outer shape of the housing 10 together with the base 21 and forms the inner space of the housing 10. Figure 2 and Figure 3 As shown, the cover 11 has an upper surface 12 , a front surface 13 , side surfaces 14 , 14 , and a rear surface 15 .

[0048] The upper surface 12 is a surface extending along the ZX plane, and is a surface located on the positive direction side in the Y direction of the cover portion 11. The front surface 13 is a surface extending along the XY plane, and is a surface located on the positive direction side in the Z direction of the cover portion 11. The side surfaces 14, 14 are surfaces extending along the YZ plane, and are surfaces located on the positive direction side and the negative direction side in the X direction of the cover portion 11. The rear surface 15 is a surface extending along the XY plane, and is a surface located on the negative direction side in the Z direction of the cover portion 11.

[0049] In addition, the upper surface 12, the front surface 13, the side surfaces 14, 14 and the rear surface 15 may be surfaces consisting of only a plane, a surface consisting of a combination of a plane and a curved surface, or a surface consisting of only a curved surface. In addition, the upper surface 12, the front surface 13, the side surfaces 14, 14 and the rear surface 15 may be provided with a structure protruding from the above surface or a structure recessed therein.

[0050] like Figure 2 As shown, a flushing port 16 is provided on the cover 11. Specifically, the flushing port 16 is provided on the upper surface 12 of the cover 11. In addition, the flushing port 16 can be provided on the front surface 13 of the cover 11, or can be provided on the side surfaces 14, 14.

[0051] The flushing port 16 is disposed at a position where the central axis 40L is sandwiched between the flushing port 16 of the cover 11 and the base 21. Specifically, the flushing port 16 is disposed at a position where the central axis 40L is sandwiched between the flushing port 16 and an opening 27 of the base 21 described later.

[0052] The flushing port 16 is a through hole that penetrates the cover 11 and is used when the cleaning liquid is supplied from the outside of the housing 10 to the internal space thereof. The flushing port 16 penetrates the upper surface 12 of the cover 11.

[0053] In the Z direction, the flushing port 16 is arranged at a position closer to the positive direction side than the center of the cover 11. In other words, the flushing port 16 is arranged in an area of ​​the cover 11 that is closer to the shaft 40 than the center of the cover 11. Specifically, the flushing port 16 is arranged in an area of ​​the upper surface 12 that is closer to the shaft 40 than the center in the Z direction.

[0054] When viewed from the Y direction, the flushing port 16 is arranged so that the axis 16L of the flushing port 16 extends through a position different from the central axis 40L. In other words, the flushing port 16 is arranged at a position different from the position where the central axis 40L extends.

[0055] Specifically, the flushing port 16 is disposed at a position offset from the central axis 40L in the negative direction in the X direction when viewed from the Y direction. Alternatively, the flushing port 16 may be disposed at a position offset from the central axis 40L in the positive direction in the X direction.

[0056] The axis 16L is an axis passing through the center of the flushing port 16 as a through hole. When the through hole has a cylindrical shape or a columnar shape, the central axis of the cylindrical shape or the columnar shape is the axis 16L.

[0057] like Figure 4 As shown, the base 21 is a plate-shaped component that forms the outer shape of the housing 10 together with the cover 11, and is the part of the surgical instrument 1 that is assembled to the surgical robot. The cover 11 is arranged on the positive direction side of the base 21 in the Y direction. The surface of the base 21 on the negative direction side in the Y direction is the mounting surface 22. The mounting surface 22 is a surface for mounting the surgical instrument 1 on the surgical robot, and is a surface that contacts the surgical machine. Figure 4 The surgical robot is not shown.

[0058] For example Figure 1 and Figure 5 As shown in the figures, a shaft mounting portion 23 is provided at the end of the base 21 on the positive direction side in the Z direction, and the shaft 40 is mounted on the shaft mounting portion 23. The shaft mounting portion 23 is provided at a portion of the base 21 that protrudes toward the cover 11 side (in other words, the positive direction side in the Y direction). The shaft mounting portion 23 is provided at the center of the base 21 in the X direction. The shaft mounting portion 23 has a cylindrical shape that protrudes toward the positive direction side in the Z direction. The shaft 40 is inserted and held inside the shaft mounting portion 23.

[0059] A main flushing port 25 is provided at an end portion of the base 21 on the negative direction side in the Z direction. The main flushing port 25 is a through hole used when a cleaning liquid is supplied from the outside of the housing 10 to the inside of the shaft 40.

[0060] The main flushing port 25 is provided on the side of the base 21 opposite to the shaft 40, and is provided in a portion extending toward the cover 11 side (in other words, the positive direction side in the Y direction). The main flushing port 25 is a through hole extending along the Z direction. The main flushing port 25 may be arranged at a position away from the central axis 40L of the shaft 40, or may be arranged at a position on the central axis 40L.

[0061] The main flushing port 25 is connected to a tube 26 (see Figure 5 The tube 26 is a member used together with the main flushing port 25 when supplying the cleaning liquid to the inside of the shaft 40 .

[0062] The tube 26 is a cylindrical member formed of a flexible material such as resin. The tube 26 is arranged along the Z direction. The tube 26 may be arranged in a straight line, a combination of a straight line and a curve, or a curve.

[0063] The tube 26 is disposed between the flushing port 16 and the base 21. Specifically, the tube 26 is disposed between the flushing port 16 and an opening 27 of the base 21 described later.

[0064] When viewed from the Y direction, the tube 26 is arranged so that the axis 16L of the flushing port 16 extends through a position different from the central axis 40L. Specifically, when viewed from the Y direction, the tube 26 is arranged at a position deviated from the flushing port 16 to the positive direction side in the X direction. Alternatively, the tube 26 may be arranged at a position deviated from the flushing port 16 to the negative direction side in the X direction.

[0065] The end portion of the tube 26 on the negative direction side in the Z direction is connected to the main flushing port 25. The end portion of the tube 26 on the positive direction side in the Z direction is arranged inside the shaft 40.

[0066] like Figure 4As shown, three openings 27, 27, 27 and three slides 28, 28, 28 are provided on the base 21. In the following, sometimes only one opening 27 is described, but the other two openings 27, 27 also have the same structure. In the following, the opening 27 is also referred to as a driven groove. In addition, in the following, sometimes only one slide 28 is described, but the other two slides 28, 28 also have the same structure.

[0067] The opening 27 is a through hole that allows the internal space of the housing 10 to communicate with the outside. The opening 27 is a through hole provided in the base 21 and is a long hole extending in the Z direction. The three openings 27, 27, 27 are provided at equal intervals in the X direction.

[0068] In the X direction, the three openings 27, 27, 27 are arranged in the central area of ​​the base 21. The flushing port 16 is arranged at a position closer to the positive direction side of the Z direction than the three openings 27, 27, 27. In other words, the flushing port 16 is arranged in an area closer to the axis 40 than the three openings 27, 27, 27.

[0069] The number of openings 27 can be specified based on the movement of the joint and / or forceps in the end effector 50. In other words, the number of openings 27 can be specified based on the movement according to the specifications required for the surgical instrument 1. The number of openings 27 may be more than three or less than three depending on the required specifications.

[0070] The slide body 28 is configured to receive a driving force from the surgical robot and transmit the driving force to the end effector 50. The slide body 28 is configured to be attachable to and detachable from the surgical robot.

[0071] The slider 28 is disposed so as to be relatively movable with respect to the base 21. Specifically, the slider 28 is disposed so as to be relatively movable along a linear direction with respect to the base 21. In addition, the slider 28 may be disposed so as to be rotatable with respect to the base 21.

[0072] One slide 28 is disposed in each of the three openings 27, 27, 27, and one slide 28 is disposed so as to be movable in the Z direction inside one opening 27. In other words, the slide 28 is disposed so as to be relatively movable in the linear direction relative to the base 21. One slide 28 may be disposed in each of all the openings 27, 27, 27, or may be disposed in only a part of the openings 27.

[0073] like Figure 5As shown, three wires 29, 29, 29 are provided on the base 21. The wire 29 is configured to transmit the driving force transmitted to the slide 28 to the end effector 50. One or two wires 29 are arranged on one slide 28. In the following, sometimes only one wire 29 is described, but the other two wires 29, 29 also have the same structure.

[0074] The wire 29 is a long wire made of a conductive material and can be made of a metal material used in the manipulator of a surgical robot system, such as stainless steel, tungsten, an alloy containing tungsten, or piano wire (such as wire specified in JIS G 3522).

[0075] like Figure 1 As shown, the shaft 40 is a member extending from the base 21 of the housing 10 in the Z direction and formed in a cylindrical shape. The shaft 40 may have a cylindrical shape other than a cylindrical shape.

[0076] An end effector 50 is disposed at the end of the shaft 40 on the positive side in the Z direction. Figure 5 As shown, the end of the shaft 40 on the negative side in the Z direction is mounted on the shaft mounting portion 23 of the base 21. The shaft 40 having a cylindrical shape has its inner space connected to the inner space of the housing 10.

[0077] like Figure 6 As shown, the tube 26, the plurality of wires 29, and the electric connection 51 are arranged inside the shaft 40. The electric connection 51 is used to supply electric current to the end effector 50.

[0078] The tube 26 is arranged at a position near the center of the shaft 40. A plurality of wires 29 and an electric wire 51 are arranged around the tube 26. Specifically, six wires 29 and one electric wire 51 are arranged around the tube 26.

[0079] Figure 1 The end effector 50 shown is an instrument used in surgery. The end effector 50 has the functions of a monopolar electric knife and a forceps. The end effector 50 may have only one of the functions of an electric knife and a forceps, or may have other functions.

[0080] like Figure 6 As shown, six wires 29 and one electric wire 51 are connected to the end effector 50, and the six wires 29 and the electric wire 51 are arranged to pass through the inside of the shaft 40. The end effector 50 has a structure for opening and closing the forceps and changing the direction of the forceps using the six wires 29. The end effector 50 has a structure for transmitting the high-frequency current supplied by the electric wire 51 to the forceps.

[0081] Next, refer to Figure 7 and Figure 8 The flow of the cleaning liquid when the surgical instrument 1 having the above-described structure is cleaned will be described. First, the flow of the cleaning liquid supplied from the flushing port 16 will be described.

[0082] like Figure 7 As shown, the cleaning liquid supplied from the flushing port 16 flows from the outside into the internal space of the housing 10. At this time, the cleaning liquid flows from the positive direction side to the negative direction side in the Y direction. The cleaning liquid diffuses in the internal space of the housing 10 and flows in the internal space of the housing 10. The cleaning liquid removes dirt and the like existing in the internal space of the housing 10, in other words, cleans the dirt and the like existing in the internal space of the housing 10.

[0083] The cleaning liquid flowing into the internal space of the housing 10 flows inside the housing 10 toward a position communicating with the outside of the housing 10. Specifically, the cleaning liquid flows toward the plurality of openings 27, 27, 27, the joint between the cover 11 and the base 21, and the like.

[0084] The ease with which the cleaning liquid flows is different when comparing the plurality of openings 27, 27, 27 and the joint between the cover 11 and the base 21. That is, the ease with which the cleaning liquid flows out of the plurality of openings 27, 27, 27 to the outside of the housing 10 is different from the ease with which the cleaning liquid flows out of the joint to the outside of the housing 10.

[0085] The flow resistance at the portion where the cleaning liquid flows through the plurality of openings 27, 27, 27 is smaller than the flow resistance at the joint. Therefore, after the cleaning liquid diffuses in the internal space of the housing 10, it tends to flow toward the plurality of openings 27, 27, 27, but is not easy to flow in other directions.

[0086] like Figure 7 and Figure 8 As shown, the cleaning liquid flowing into the inner space of the housing 10 flows from the flushing port 16 toward the negative direction of the Y direction and tends to flow toward the negative direction of the Z direction. In other words, the cleaning liquid flowing into the inner space of the housing 10 does not easily flow toward the positive direction of the Z direction.

[0087] In the Z direction, the shaft 40 is arranged on the positive side with respect to the flushing port 16 . Therefore, the cleaning liquid that has flowed into the internal space of the housing 10 is unlikely to flow toward the shaft 40 , and thus is unlikely to flow into the shaft 40 .

[0088] A portion of the cleaning liquid that has flowed into the internal space of the housing 10 is also likely to flow toward the positive direction side of the X direction. The shaft 40 is configured to extend along the Z direction, and the flow toward the positive direction side of the X direction flows in a direction that crosses the shaft 40, rather than flowing toward the inside of the shaft 40. Therefore, the cleaning liquid that has flowed into the internal space of the housing 10 is unlikely to flow toward the inside of the shaft 40, and is unlikely to flow into the inside of the shaft 40.

[0089] In addition, the cleaning liquid flows from the flushing port 16 into the internal space of the housing 10 without colliding with other components or with the tube 26. Hereinafter, the case where the cleaning liquid collides with the tube without colliding with other components is also referred to as "direct collision". Therefore, the flow direction of the cleaning liquid is less likely to be changed to the direction toward the inside of the shaft 40 due to the direct collision with the tube 26.

[0090] Next, the flow of the cleaning liquid supplied from the main flushing port 25 will be described. Figure 7 and Figure 8 As shown, the cleaning liquid supplied from the main flushing port 25 flows into the tube 26. The cleaning liquid is introduced into the interior of the shaft 40 through the tube 26.

[0091] like Fig. 9 As shown, the cleaning liquid introduced by the tube 26 flows into the interior of the shaft 40. The end of the shaft 40 on the positive direction side in the Z direction is closed, and the cleaning liquid flowing out of the tube 26 in the positive direction of the Z direction changes its flow direction inside the shaft 40 to the negative direction of the Z direction.

[0092] The cleaning liquid having changed its flow direction removes dirt and the like present inside the shaft 40. In other words, the inside of the shaft 40 is cleaned. The cleaning liquid returned to the internal space of the housing 10 flows out to the outside of the housing 10 through the plurality of openings 27, 27, 27, etc.

[0093] In addition, if Fig.10 As shown, a discharge hole 55 for discharging the cleaning liquid to the outside may also be provided on the shaft 40. Fig.10 In the embodiment, a discharge hole 55 is provided at a position on the shaft 40 where the end effector 50 is installed. The position where the discharge hole 55 is provided may also be different from the position where the end effector 50 is installed.

[0094] According to the surgical instrument 1 configured as above, the cleaning liquid flowing into the internal space of the housing 10 from the flushing port 16 crosses the central axis 40L of the shaft 40, and is easily discharged to the outside of the housing 10 through the plurality of openings 27, 27, 27. In other words, the main flow direction of the cleaning liquid is easily directed toward the plurality of openings 27, 27, 27. The direction in which the cleaning liquid flows is easily directed to cross the central axis 40L of the shaft 40.

[0095] The cleaning liquid tends to flow toward the inside of shaft 40 less than the plurality of openings 27, 27, 27. That is, the cleaning liquid tends not to flow from the interior of housing 10 toward the inside of shaft 40.

[0096] In addition, the cleaning liquid supplied from the flushing port 16 to the inside of the housing 10 tends to flow toward the center of the housing 10. In other words, the component in the negative direction of the Z axis tends to increase among the components of the flow direction of the cleaning liquid flowing from the flushing port 16 toward the plurality of openings 27, 27, 27. For example, the cleaning liquid tends to flow in a direction away from the shaft 40, so it is difficult for the cleaning liquid to flow from the internal space of the housing 10 into the inside of the shaft 40.

[0097] Since the axis 16L of the flushing port 16 extends through a position different from the central axis 40L of the shaft 40, the main flow direction of the cleaning liquid flowing in from the flushing port 16 along the axis 16L tends to be different from the direction toward the shaft 40. Therefore, the cleaning liquid is less likely to flow from the internal space of the housing 10 into the interior of the shaft 40.

[0098] Therefore, the necessity of returning the cleaning liquid that has flowed into the interior of the shaft 40 after cleaning the interior space of the housing 10 from the interior of the shaft 40 to the interior space of the housing 10 and then flowing out to the outside of the housing 10 is reduced. As a result, the time required for cleaning the surgical instrument 1 is less likely to increase, and a decrease in cleaning efficiency can be easily suppressed.

Claims

1. A surgical instrument comprising: a housing having an internal space, and a shaft extending from the housing and formed into a cylindrical shape and communicating with the internal space, wherein: The housing has: a flushing port, the flushing port being a through hole for a cleaning liquid to flow from the outside into the housing; and at least one opening through which the cleaning liquid flows to the outside, and The flushing port is arranged at a position where the central axis of the shaft is sandwiched between the flushing port and the at least one opening.

2. The surgical instrument according to claim 1, characterized in that: The flushing port is arranged so that an axis of the flushing port extends through a position different from the central axis of the shaft.

3. The surgical instrument according to claim 1 or 2, characterized in that: The flushing port is disposed in a region of the housing that is closer to the shaft than the at least one opening.

4. A surgical instrument comprising: a housing having an internal space, and a shaft extending from the housing and formed into a cylindrical shape and communicating with the internal space, wherein: The housing has a flushing port, which is a through hole for a cleaning liquid to flow into the housing from the outside. The flushing port is arranged in a region closer to the shaft than to a center of the housing in an extending direction of the shaft.

5. The surgical instrument according to claim 4, characterized in that: The flushing port is arranged so that the axis of the flushing port extends through a position different from the position where the central axis of the shaft extends.

6. The surgical instrument according to claim 4, characterized in that: The housing has at least one opening, and the cleaning liquid flows out to the outside through the at least one opening. The at least one opening is arranged at a position where the central axis of the shaft is sandwiched between the at least one opening and the flushing port.

Images