Surgical instrument

Abstract

A surgical instrument includes a housing having an internal space, a shaft extending from the housing and formed in a cylindrical shape and communicating with the internal space, and the housing has a flush port that is a through-hole for a cleaning liquid to flow into the housing from the outside, and at least one opening portion through which the cleaning liquid flows to the outside, and the flush port is disposed at a position where a center axis of the shaft is interposed between the flush port and the at least one opening portion.

Description

Technical Field

[0001] This disclosure relates to surgical instruments. Background Technology

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

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

[0004] Cleaning fluid is supplied through a flushing port located on the sleeve and a main flushing port, which is separate from the flushing port. The cleaning fluid supplied through the flushing port is then fed into the interior of the sleeve. The interior of the sleeve is cleaned using the cleaning fluid supplied from the flushing port.

[0005] The cleaning fluid supplied through the main flush port is delivered to the interior of the shaft via a tube extending from the main flush port. This tube is positioned inside the sleeve such that it extends from the main flush port into the interior of the shaft. The interior of the shaft is cleaned using the cleaning fluid supplied through the main flush port and the tube.

[0006] Existing technical documents

[0007] Patent documents

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

[0009] Problem to be solved by the invention

[0010] The connection between the sleeve and the shaft is open. In other words, the internal space of the sleeve and the internal space of the shaft are interconnected. Most of the cleaning fluid used to clean the inside of the sleeve flows out of the sleeve. On the other hand, some of the used cleaning fluid used to clean the inside of the sleeve flows from the internal space of the sleeve into the internal space of the shaft.

[0011] In most cases, the shaft does not have an opening for the cleaning fluid to flow out. In most cases, the cleaning fluid inside the shaft flows out through the sleeve. Therefore, the used cleaning fluid that flows from the sleeve into the shaft needs to return from the shaft to the sleeve and then flow out through the sleeve again. Consequently, the time required to clean surgical instruments is often longer, and the cleaning efficiency is often reduced. Furthermore, in the following text, the sleeve of this disclosure will also be referred to as the "housing".

[0012] This disclosure provides an example of a surgical instrument that is easy to suppress the decline in cleaning efficiency.

[0013] Method of solving the problem

[0014] One aspect of the surgical instrument disclosed herein comprises: a housing having an internal space, and a shaft extending from the housing and formed in a cylindrical shape and communicating with the internal space, the housing having: a flushing port, the flushing port being a through-hole for a cleaning fluid to flow into the housing from the outside; and at least one opening through which the cleaning fluid flows out to the outside, and the flushing port being disposed in a position such that the central axis of the shaft is sandwiched between the flushing port and the at least one opening.

[0015] According to the surgical instrument of this disclosure, the cleaning fluid flowing into the interior of the housing from the irrigation port crosses the central axis of the shaft, thereby facilitating its outflow from at least one opening to the exterior of the housing. The flow direction of the cleaning fluid is the direction that crosses the central axis of the shaft. Of the components of the flow direction of the cleaning fluid, the component flowing towards the interior of the shaft is more likely to be smaller than the component flowing towards the at least one opening. In other words, the flow direction of the cleaning fluid is less likely to be from the interior space of the housing towards the interior of the shaft.

[0016] In one embodiment of the surgical instrument of this disclosure, the irrigation port is preferably configured such that the axis of the irrigation port extends through a location different from the central axis of the axis.

[0017] Based on the above configuration, the main flow direction of the cleaning fluid flowing into the housing from the flushing port along this axis is prone to become a direction different from the direction towards the interior of the shaft. Therefore, the cleaning fluid supplied to the interior of the housing through the flushing port is less likely to flow from the interior space of the housing into the interior of the shaft. In the following text, regarding the positional relationship between the flushing port and the shaft, the positional relationship in which the axis of the flushing port is extended through a position different from the central axis of the shaft is also referred to as a torsional positional relationship.

[0018] In one embodiment of the surgical instrument of this disclosure, the irrigation port is preferably located in a region of the housing that is closer to the axis than the at least one opening.

[0019] Based on the above configuration, in the component of the flow direction of the cleaning fluid flowing from the flushing port into the interior of the housing, the negative component of the Z-axis (the direction away from the central axis of the shaft) tends to increase. This makes it difficult for the cleaning fluid to flow from the interior space of the housing into the interior of the shaft.

[0020] One aspect of the surgical instrument disclosed herein includes: 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, the housing having a flushing port, the flushing port being a through-hole for a cleaning fluid to flow into the housing from the outside, the flushing port being disposed in a region closer to the shaft than to the center of the housing in the direction of extension of the shaft.

[0021] According to the surgical instrument of this disclosure, the primary flow direction of the cleaning fluid supplied from the irrigation port to the interior of the housing is preferably towards the center of the housing. In other words, the cleaning fluid is preferably flowed away from the shaft. The cleaning fluid is less likely to flow from the interior space of the housing into the interior of the shaft.

[0022] In one embodiment of the surgical instrument of this disclosure, the irrigation port is preferably configured such that the axis of the irrigation port extends through a position different from the position extending from the central axis of the axis.

[0023] Based on the above configuration, the main flow direction of the cleaning fluid flowing into the housing from the flushing port along the axis is prone to become a different direction from the direction towards the interior of the shaft. The cleaning fluid does not easily flow from the interior space of the housing into the interior of the shaft.

[0024] In one embodiment of the surgical instrument disclosed herein, the housing preferably has at least one opening through which the cleaning fluid flows out to the outside, and preferably the at least one opening is positioned such that the central axis of the shaft is sandwiched between the at least one opening and the rinsing port.

[0025] Based on the above configuration, the main flow direction of the cleaning fluid tends to be towards at least one opening. Therefore, the flow direction of the cleaning fluid tends to be across the central axis of the shaft. Of the components of the cleaning fluid flow direction, the component flowing towards the interior of the shaft tends to be smaller than the component flowing towards at least one opening. In other words, the flow direction of the cleaning fluid does not tend to be from the interior space of the housing towards the interior of the shaft.

[0026] Effects of the invention

[0027] According to the surgical instrument of this disclosure, since the irrigation port is positioned such that the central axis of the shaft is sandwiched between the irrigation port and at least one opening, the flow direction of the cleaning fluid is not easily from the internal space of the housing towards the interior of the shaft, thereby effectively suppressing the decrease in cleaning efficiency.

[0028] According to the surgical instrument disclosed herein, since the irrigation port is located in a region closer to the shaft than the center of the housing in the direction of shaft extension, the flow direction of the cleaning fluid is less likely to be from the interior space of the housing toward the interior of the shaft, thereby easily suppressing the decrease in cleaning efficiency. Attached Figure Description

[0029] Figure 1 This is a front view illustrating the composition of the surgical instruments disclosed herein.

[0030] Figure 2 This is an explanation Figure 1A three-dimensional view of the exterior of the shell and cover.

[0031] Figure 3 This is an explanation Figure 1 A three-dimensional diagram of the internal structure of the cover.

[0032] Figure 4 This is an explanation Figure 1 A three-dimensional view of the exterior of the base.

[0033] Figure 5 This is an explanation Figure 1 A three-dimensional diagram of the internal structure of the base.

[0034] Figure 6 This is an explanation Figure 1 A cross-sectional view of the interior structure of the axis along the arrow of line VI-VI.

[0035] Figure 7 This is a schematic diagram illustrating the flow of cleaning fluid in surgical instruments.

[0036] Figure 8 This is a schematic diagram illustrating the flow of cleaning fluid within the casing.

[0037] Figure 9 This is a schematic diagram illustrating the flow of cleaning fluid in the shaft.

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

[0039] Explanation of reference numerals

[0040] 1…surgical instrument; 10…housing shell; 16…irrigation port; 16L…axis; 26…tube; 27…opening; 40…shaft; 40L…central axis Detailed Implementation

[0041] Reference Figures 1 to 8 This invention describes a surgical instrument 1 according to one embodiment of the present disclosure. The surgical instrument 1 in this embodiment is a surgical instrument and is mounted on a master-slave surgical robot. Alternatively, the surgical instrument 1 may also be mounted on a surgical robot other than a master-slave type. Furthermore, 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 a device that operates by a driving force transmitted from the outside. The driving force is generated by an external driving source such as an actuator and 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] In the following description, the X, Y, and Z directions will be used as described below. The X and Y directions are directions extending along a plane orthogonal to the central axis 40L of axis 40, and are orthogonal to each other, wherein the central axis 40L of axis 40 is along... Figure 1 The paper extends from the plane. The plane orthogonal to the central axis 40L of axis 40 and... Figure 1 The paper surfaces are orthogonal.

[0045] In other words, the X direction is the 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 The Y direction is the direction that the paper tends to move towards the front. In other words, the positive direction of the Y direction is from the base 21 of the housing 10 toward the cover 11. The Z direction is the direction parallel to the central axis 40L, and the positive direction of the Z direction is from the housing 10 toward the end actuator 50.

[0046] The housing 10 is a container with internal space and is the part of the surgical instrument 1 that is assembled into the surgical robot. For example... Figure 2 As shown, the housing 10 has a cover 11 and a base 21.

[0047] The cover 11, together with the base 21, forms the external shape of the housing 10 and the internal space of the housing 10. For example... 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 located on the positive Y-direction side of the cover 11. The front surface 13 is a surface extending along the XY plane and is located on the positive Z-direction side of the cover 11. The side surfaces 14 are surfaces extending along the YZ plane and are located on the positive and negative X-direction sides of the cover 11. The rear surface 15 is a surface extending along the XY plane and is located on the negative Z-direction side of the cover 11.

[0049] Furthermore, the upper surface 12, the front surface 13, the side surfaces 14, 14, and the rear surface 15 can be surfaces composed solely of planes, surfaces composed of a combination of planes and curved surfaces, or surfaces composed solely of curved surfaces. In addition, structures protruding from or recessed from the aforementioned surfaces can be provided on the upper surface 12, the front surface 13, the side surfaces 14, 14, 14, and the rear surface 15.

[0050] likeFigure 2 As shown, a rinsing port 16 is provided on the cover portion 11. Specifically, the rinsing port 16 is provided on the upper surface 12 of the cover portion 11. Alternatively, the rinsing port 16 may be provided on the front surface 13 of the cover portion 11, or on the side surfaces 14, 14.

[0051] The flushing port 16 is positioned such that a central axis 40L is sandwiched between the flushing port 16 of the cover 11 and the base 21. Specifically, the central axis 40L is positioned such that a central axis 40L is sandwiched between the flushing port 16 and the opening 27 of the base 21, which will be described later.

[0052] The flushing port 16 is a through-hole penetrating the cover portion 11 and is used to supply cleaning fluid from the outside of the housing 10 to its internal space. The flushing port 16 penetrates the upper surface 12 of the cover portion 11.

[0053] In the Z direction, the flushing port 16 is located closer to the positive direction side than the center of the cover 11. In other words, the flushing port 16 is located in the region of the cover 11 that is closer to the axis 40 than the center of the cover 11. Specifically, the flushing port 16 is located in the upper surface 12 in the region that is closer to the axis 40 than the center in the Z direction.

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

[0055] Specifically, when viewed from the Y direction, the flushing port 16 is positioned at a location offset in the negative X direction compared to the central axis 40L. Alternatively, the flushing port 16 can also be positioned at a location offset in the positive X direction compared to the central axis 40L.

[0056] The axis 16L is the axis that passes through the center of the flushing port 16, which serves as a through-hole. When the through-hole has a cylindrical or cylindrical shape, the central axis of the cylindrical or cylindrical shape is the axis 16L.

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

[0058] For exampleFigure 1 and Figure 5 As shown, a shaft mounting portion 23 is provided at the end of the base 21 on the positive direction side in the Z direction, and a 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 portion 11 (in other words, the positive direction side in the Y direction). The shaft mounting portion 23 is located 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 into and held inside the shaft mounting portion 23.

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

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

[0061] A tube 26 is connected to the main flushing port 25 (see reference). Figure 5 Pipe 26 is a component used in conjunction with the main flush port 25 when supplying cleaning fluid to the interior of shaft 40.

[0062] Tube 26 is a cylindrical component made of a flexible material such as resin. Tube 26 is arranged along the Z direction. Tube 26 can be arranged in a straight shape, a combination of straight and curved shapes, or a curved shape.

[0063] The pipe 26 is disposed between the flushing port 16 and the base 21. Specifically, it is disposed between the flushing port 16 and the opening 27 of the base 21, which will be described later.

[0064] When viewed from the Y direction, the tube 26 is configured such 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 positioned at a location offset to the positive direction in the X direction compared to the flushing port 16. Alternatively, the tube 26 may be positioned at a location offset to the negative direction in the X direction compared to the flushing port 16.

[0065] The negative Z-direction end of tube 26 is connected to the main flushing port 25. The positive Z-direction end of tube 26 is disposed inside the shaft 40.

[0066] like Figure 4As shown, the base 21 has three openings 27, 27, 27 and three sliding bodies 28, 28, 28. In the following description, sometimes only one opening 27 will be used, but the other two openings 27, 27 also have the same structure. In the following description, opening 27 will also be referred to as the driven groove. Furthermore, in the following description, sometimes only one sliding body 28 will be used, but the other two sliding bodies 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 on the base 21 and is an elongated hole extending along the Z direction. The three openings 27, 27, 27 are provided at equal intervals in the X direction.

[0068] In the X direction, three openings 27, 27, 27 are disposed in the central region of the base 21. A flushing port 16 is disposed closer to the positive direction side in the Z direction than the three openings 27, 27, 27. In other words, the flushing port 16 is disposed in the region closer to the axis 40 than the three openings 27, 27, 27.

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

[0070] The slider 28 is configured to receive driving force from the surgical robot and transmit the driving force to the end effector 50. Furthermore, the slider 28 has a configuration that allows it to be mounted to and detached from the surgical robot.

[0071] The slider 28 is configured to move relative to the base 21. Specifically, the slider 28 is configured to move relative to the base 21 in a straight line. Alternatively, the slider 28 may be configured to rotate relative to the base 21.

[0072] A slider 28 is disposed in each of the three openings 27, 27, 27, and the slider 28 is configured to move along the Z direction inside the opening 27. In other words, the slider 28 is configured to move relative to the base 21 in a straight line. A slider 28 may be disposed in each of all the openings 27, 27, 27, or may be disposed in only a portion of the openings 27.

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

[0074] Wire 29 is made of a conductive material and formed into a long strip. Wire 29 can be formed from a metallic material used in the robotic arms of a surgical robot system, such as stainless steel, tungsten, an alloy containing tungsten, or piano wire (e.g., wire specified in JIS G 3522).

[0075] like Figure 1 As shown, shaft 40 is a component that extends from the base 21 of housing 10 along the Z direction and is formed into a cylindrical shape. Shaft 40 may also have a cylindrical shape other than a cylindrical shape.

[0076] An end effector 50 is disposed at the end of shaft 40 on the positive direction side in the Z direction. For example... Figure 5 As shown, the negative Z-direction end of the shaft 40 is mounted on the shaft mounting portion 23 of the base 21. The cylindrical shaft 40 has its internal space communicating with the internal space of the housing 10.

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

[0078] The tube 26 is positioned near the center inside the shaft 40. Multiple wires 29 and an electrical connection 51 are arranged around the tube 26. Specifically, six wires 29 and one electrical connection 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 electrosurgical unit and forceps. The end effector 50 may have only the functions of an electrosurgical unit and forceps, or it may have other functions.

[0080] like Figure 6 As shown, the end effector 50 is connected to six wires 29 and one electrical connection 51, which are arranged to pass through the interior of the shaft 40. The end effector 50 is configured to open and close the pliers and change the direction of the pliers using the six wires 29. The end effector 50 is configured to transmit a high-frequency current supplied by the electrical connection 51 to the pliers.

[0081] Next, refer to Figure 7 andFigure 8 The flow of the cleaning fluid when cleaning the surgical instrument 1 having the above-described configuration will be explained. First, the flow of the cleaning fluid supplied from the rinsing port 16 will be explained.

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

[0083] The cleaning fluid flowing into the interior space of the housing 10 flows towards a location communicating with the outside of the housing 10. Specifically, the cleaning fluid flows to multiple openings 27, 27, 27, the joint between the cover 11 and the base 21, etc.

[0084] Comparing the multiple openings 27, 27, 27 and the joint between the cover 11 and the base 21, the ease of cleaning fluid flow is different. That is, the ease with which cleaning fluid flows out of the multiple openings 27, 27, 27 to the outside of the housing 10 is different from the ease with which cleaning fluid flows out of the aforementioned joint to the outside of the housing 10.

[0085] The flow resistance at the portions through which the cleaning fluid flows in the multiple openings 27, 27, 27 is less than the flow resistance at the joints. Therefore, after the cleaning fluid diffuses within the internal space of the housing 10, it is easier to flow toward the multiple openings 27, 27, 27, and less likely to flow in other directions.

[0086] like Figure 7 and Figure 8 As shown, the cleaning fluid flowing into the internal space of the housing 10 flows from the rinsing port 16 toward the negative Y direction and readily flows toward the negative Z direction. In other words, the cleaning fluid flowing into the internal space of the housing 10 does not readily flow toward the positive Z direction.

[0087] In the Z direction, the shaft 40 is positioned on the positive side relative to the flushing port 16. Therefore, the cleaning fluid flowing into the interior space of the housing 10 does not easily flow toward the shaft 40, and thus does not easily flow into the interior of the shaft 40.

[0088] A portion of the cleaning fluid flowing into the interior space of the housing 10 also tends to flow towards the positive direction in the X direction. The shaft 40 is configured to extend along the Z direction, and the flow towards the positive direction in the X direction is in a direction traversing the shaft 40, rather than flowing towards the interior of the shaft 40. Therefore, the cleaning fluid flowing into the interior space of the housing 10 does not tend to flow towards the interior of the shaft 40, thus preventing it from easily entering the interior of the shaft 40.

[0089] Furthermore, the cleaning fluid flows from the rinsing port 16 into the interior space of the housing 10 without colliding with other components or with the pipe 26. In the following text, the situation where the cleaning fluid collides with the pipe but not with other components is also referred to as "direct collision." Therefore, the flow direction of the cleaning fluid is unlikely to change towards the interior of the shaft 40 due to a direct collision with the pipe 26.

[0090] Next, the flow of the cleaning fluid supplied from the main flushing port 25 will be explained. For example... Figure 7 and Figure 8 As shown, the cleaning fluid supplied from the main flushing port 25 flows into the pipe 26. The cleaning fluid is then introduced into the interior of the shaft 40 through the pipe 26.

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

[0092] The cleaning fluid, whose flow direction has been changed, removes dirt and other contaminants present inside the shaft 40. In other words, the inside of the shaft 40 is cleaned. The cleaning fluid, which returns to the interior space of the housing 10, flows out to the outside of the housing 10 through multiple openings 27, 27, 27, etc.

[0093] In addition, such as Figure 10 As shown, a discharge hole 55 for discharging cleaning fluid to the outside can also be provided on the shaft 40. Figure 10 In this configuration, a discharge hole 55 is provided at the location on the shaft 40 where the end actuator 50 is mounted. The location of the discharge hole 55 may also differ from the location where the end actuator 50 is mounted.

[0094] According to the surgical instrument 1 configured as described above, the cleaning fluid flowing into the internal space of the housing 10 from the irrigation port 16 crosses the central axis 40L of the shaft 40, thereby easily flowing out of the housing 10 through the multiple openings 27, 27, 27. In other words, the main flow direction of the cleaning fluid is easily towards the multiple openings 27, 27, 27. The direction of the cleaning fluid flow is easily oriented across the central axis 40L of the shaft 40.

[0095] In the flow direction component of the cleaning fluid, the flow component flowing toward the interior of shaft 40 is more likely to be smaller than the flow component flowing toward the plurality of openings 27, 27, 27. In other words, the flow direction of the cleaning fluid is less likely to be from the interior space of housing 10 toward the interior of shaft 40.

[0096] Furthermore, the cleaning fluid supplied from the flushing port 16 to the interior of the housing 10 tends to flow towards the center of the housing 10. In other words, the component of the flow direction of the cleaning fluid flowing from the flushing port 16 toward the plurality of openings 27, 27, 27 tends to increase in the negative Z-axis direction. For example, the cleaning fluid tends to flow in a direction away from the shaft 40, so the cleaning fluid is less likely to flow from the interior space of the housing 10 into the interior of the shaft 40.

[0097] Because 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 fluid flowing in from the flushing port 16 along the axis 16L is prone to become a different direction from the direction toward the shaft 40. Therefore, the cleaning fluid is less likely to flow from the interior space of the housing 10 into the interior of the shaft 40.

[0098] Therefore, the necessity of returning the cleaning fluid that flowed into the shaft 40 after cleaning the interior space of the housing 10 to the interior space of the housing 10 and then out to the outside of the housing 10 is reduced. As a result, the time required to clean the surgical instrument 1 is not easily increased, thereby making it easier to suppress the decrease in cleaning efficiency.

Claims

1. A surgical instrument having a housing having an internal space, and a shaft extending from the housing and formed in a cylindrical shape and communicating with the internal space, the surgical instrument characterized in that, the housing has a lid, and a base portion which is a plate-like member, and the housing has: a flush port which is a first through-hole for a cleaning liquid to flow into the housing from the outside; at least one opening portion through which the cleaning liquid flows to the outside; a main flush port which is a second through-hole for a cleaning liquid supplied to the inside of the shaft to flow into the housing; and a tube which is disposed in the internal space, supplies the cleaning liquid flowing in from the main flush port to the inside of the shaft, and the flush port is disposed at a position at which a central axis of the shaft is interposed between the flush port and the at least one opening portion, and the flush port is disposed at the lid such that an axis of the flush port extends through a position different from the central axis, the flush port is disposed in a region of the lid closer to the shaft than the at least one opening portion, and the flush port is disposed at a position deviated from the central axis to one side in an X direction when the housing is viewed in a Y direction, one of the at least one opening portion is disposed at a position deviated from the central axis to a side opposite to the one side in the X direction in the base portion when the housing is viewed in the Y direction, the X direction and the Y direction are directions extending along a plane orthogonal to the central axis, the X direction is a direction extending along the base portion, and the Y direction is a direction orthogonal to the X direction, an end portion of one side of the tube is connected to the main flush port, and an end portion of the other side of the tube is disposed in the inside of the shaft.

2. The surgical instrument according to claim 1, characterized in that, the flush port is disposed closer to the shaft than a center of a length of the shaft in the housing in an extending direction of the shaft. ​

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