Obturator and trocar

Abstract

An obturator includes a shaft that is inserted into a cannula and has a pointed tip for piercing a body wall, a handle that is attached to a proximal end of the shaft and is held by an operator, and recesses that are formed in the handle and are engaged by fingers of the operator.

Description

Technical Field

[0001] The present invention relates to an obturator and a trocar. Background Technology

[0002] A cannula is used in surgical procedures. A cannula consists of a cannula and an occluder. The cannula is cylindrical with an insertion port for guiding an endoscope and / or treatment instrument into the body cavity. The occluder has: a shaft, inserted into the insertion port of the cannula, and pointed at the tip to allow penetration into the patient's body wall; and a handle, with the base of the shaft attached for the operator to hold. After the operator penetrates the occluder along with the cannula into the body wall, the occluder is removed from the cannula, leaving only the cannula in the body wall.

[0003] Japanese Patent Application Publication No. 2003-047618 describes a type of blocker that has a recess formed on one side of a frustum-shaped handle. Summary of the Invention

[0004] The technical problem to be solved by the invention

[0005] According to the blocking device described in Japanese Patent Application Publication No. 2003-047618, the operator can, for example, hook their thumb into a recess in the handle to operate it. However, since only one recess is formed on one side of the handle, there is room for improvement in terms of operational stability.

[0006] One embodiment of the present invention provides a stopper and cannula that further improves operational stability.

[0007] means for solving technical problems

[0008] The occluder of the present invention comprises: a shaft inserted into a sleeve and pointed at the front end in a needle shape for piercing into the body wall; a handle on which the base end of the shaft is mounted for the operator to hold; and at least two recesses formed in the handle for the operator's fingers to hook.

[0009] Preferably, two recesses are formed at the opposite position of the handle.

[0010] The preferred recess has at least: a first surface formed along the axial direction of the shaft; and a second surface connected to and intersecting the first surface at one end of the handle on which the base end of the shaft is mounted, i.e., the connecting end side.

[0011] Preferably, the first and second surfaces are connected by curved surfaces.

[0012] Preferably, at least one of the first and second faces contains a curved surface.

[0013] Preferably, the first surface extends from the front side of the connecting end to the other end of the handle, i.e., the release end, on the side opposite to the connecting end.

[0014] When one end of the handle with the shaft mounted on it is designated as the connecting end, and the other end of the handle on the opposite side of the connecting end is designated as the releasing end, it is preferable that the handle is tapered in shape from the connecting end toward the releasing end.

[0015] The handle is preferably shaped like a frustum, formed by cutting a portion of an elongated ellipse along its minor axis.

[0016] The handle is preferably cylindrical.

[0017] Preferably, the length of the handle along the axial direction of the shaft is more than 1.2 times and less than 1.5 times the length of the handle along the radial direction of the shaft.

[0018] Preferably, the length of the handle along the axial direction of the shaft is 40 mm or more and less than 70 mm.

[0019] The preferred handle has a notch that accommodates at least a portion of a button for disengaging the sleeve, and is positioned differently from the recess in the circumferential direction of the shaft.

[0020] The preferred handle has a protrusion that is connected to the sleeve and is positioned in the circumferential direction of the shaft corresponding to the recess.

[0021] The cannula of the present invention comprises: a plug as described in any of the above claims; and a cannula for detachably inserting the plug.

[0022] The preferred sleeve has: a cylindrical sleeve body with an insertion hole for shaft insertion; and a connecting part with a base end of the sleeve body for detachable connection to a handle, and a length along the axial direction of the shaft that is shorter than that of the handle.

[0023] Invention Effects

[0024] According to the technology of the present invention, a plug and cannula needle with further improved operational stability can be provided. Attached Figure Description

[0025] Figure 1 This is a 3D view of the cannula.

[0026] Figure 2 This is an exploded 3D view of the cannula.

[0027] Figure 3 This is a plan view of the cannula.

[0028] Figure 4 These are the side and front views of the blocker.

[0029] Figure 5This diagram shows the situation just before the shaft of the plug, along with the sleeve, is pierced into the body wall.

[0030] Figure 6 This diagram illustrates the situation where the plug is removed from the cannula while only the cannula remains in the body wall.

[0031] Figure 7 This is a flowchart showing the operating sequence of the cannula.

[0032] Figure 8 This is a diagram showing a handle having a first surface composed of curved surfaces that bulge inwards.

[0033] Figure 9 This is a diagram showing a handle with a first surface consisting of a curved surface that bulges outwards.

[0034] Figure 10 This is a diagram showing a handle having a second surface formed by a curved surface protruding towards the connecting end.

[0035] Figure 11 This is a diagram showing a handle with a first surface that tilts inwards as it faces the connecting end.

[0036] Figure 12 It is a diagram showing a handle with a deep-digging face that is dug inward from the connection between the first and second faces.

[0037] Figure 13 This is a diagram showing a frustum-shaped handle.

[0038] Figure 14 This is a diagram showing a frustum-shaped handle with a first surface consisting of curved surfaces convex inwards.

[0039] Figure 15 It is a diagram showing a frustum-shaped handle having a first surface extending from the front side of the connection end to the release end.

[0040] Figure 16 This is a diagram showing a cylindrical handle.

[0041] Figure 17 It is a diagram showing a cylindrical handle with a first surface consisting of curved surfaces convex inwards.

[0042] Figure 18 This is a diagram showing another example of a handle. Detailed Implementation

[0043] As an example, such as Figure 1 and Figure 2 As shown, the cannula 10 consists of a cannula 11 and a plug 12. The cannula 11 has a cannula body 13 and a connecting portion 14. The plug 12 has a shaft 15 and a handle 16. Additionally, Figure 1 This indicates that the sleeve 11 is installed in the plug 12. Figure 2 This indicates that the sleeve 11 has been separated from the blocker 12.

[0044] The sleeve body 13 is cylindrical with an insertion hole 17 for the shaft 15 to pass through. The connecting part 14 is also cylindrical with an insertion hole 18 connected to the insertion hole 17. The insertion holes 17 and 18 are approximately the same diameter. The connecting part 14 has a diameter that is one size larger than that of the sleeve body 13 and is mounted on the base end 19 of the sleeve body 13. The handle 16 is detachably connected to the connecting part 14.

[0045] A button 20 is provided on the connecting part 14. The button 20 is operated by the operator when the sleeve 11 is separated from the blocker 12. Furthermore, two grooves 21 are formed on the connecting part 14 along the axial direction AD of the shaft 15. The two grooves 21 are positioned 180° apart when viewed from the axial direction AD of the shaft 15, i.e., opposite each other. Additionally, a port 29 for introducing gases such as carbon dioxide into the body cavity is provided on the connecting part 14. Although figures and detailed descriptions are omitted, the connecting part 14 includes a latching mechanism for detachably retaining the handle 16, and seals to prevent gas and liquid from leaking from the body cavity to the outside. The body cavity is, for example, the abdominal cavity.

[0046] The shaft 15 is an elongated rod-shaped part with a front end 22 and a base end 23, and is made of a metal such as titanium alloy. The front end 22 is designed to pierce the patient's body wall (BW) (see reference). Figure 5 and Figure 6 It is pointed into a needle shape. The length of the shaft 15 along the axial direction AD is longer than the length of the sleeve body 13 along the axial direction AD. Therefore, when the sleeve 11 is installed in the plug 12, as Figure 1 As shown, the front end 22 of the shaft 15 protrudes from the sleeve body 13. Alternatively, the shaft 15 can also be made of resin such as ABS (Acrylonitrile-Butadiene-Styrene). Furthermore, the shaft 15 can be made of different materials; for example, the front end 22 could be made of ABS resin, while the rest of the shaft could be made of stainless steel.

[0047] Handle 16 is mounted on the base end 23 of shaft 15. The corners of handle 16 are rounded by R-beveling. Handle 16 is provided for the operator to grip (see reference). Figure 5 and Figure 6Two recesses 24 are formed on the handle 16. The two recesses 24 extend from the front side of the connecting end 25 (where the base end 23 of the shaft 15 is mounted) of the handle 16 to the front side of the release end 26 (on the opposite side of the connecting end 25). The two recesses 24 are positioned 180° apart when viewed from the axis AD of the shaft 15, i.e., opposite to each other. The operator's fingers hook onto the recesses 24 (see reference). Figure 5 and Figure 6 Therefore, the recess 24 can also be described as a finger hook portion. Furthermore, the operator refers to all personnel who operate the cannula 10, such as doctors performing surgical procedures using the cannula 10.

[0048] A notch 27 is provided at the connecting end 25. The notch 27 accommodates approximately half of the button 20. The notch 27 is positioned differently from the recess 24 on the circumferential direction CD of the shaft 15. Specifically, the notch 27 is positioned between the two recesses 24. In other words, the notch 27 is positioned 90° apart from the two recesses 24, which are positioned 180° apart when viewed from the axial direction AD of the shaft 15 over the handle 16.

[0049] Furthermore, two protrusions 28 are provided at the connecting end 25 (see also...). Figure 4 The two protrusions 28 and the recesses 24 are similarly positioned at a 180° interval when viewed from the axial direction AD of the shaft 15 over the handle 16, i.e., opposite each other. That is, the two protrusions 28 are positioned on the circumferential direction CD of the shaft 15 corresponding to the recesses 24. When installing the sleeve 11 onto the blocker 12, the positions of the sleeve 11 and the blocker 12 on the circumferential direction CD are adjusted so that the protrusions 28 engage with the grooves 21. That is, the grooves 21 and the protrusions 28 serve to position the sleeve 11 installed on the blocker 12 on the circumferential direction CD.

[0050] As an example, such as Figure 3 and Figure 4 As shown, the recess 24 has a first surface 30 and a second surface 31. The first surface 30 is formed along the axial direction AD. Specifically, the first surface 30 is a surface that is substantially parallel to the axial direction AD. In contrast, the second surface 31 is formed along the radial direction RD of the axis 15. Specifically, the second surface 31 is a surface that is substantially parallel to the radial direction RD. That is, the first surface 30 and the second surface 31 intersect. The second surface 31 is connected to the first surface 30 at the connecting end 25 side via a connecting surface 32. The connecting surface 32 is a curved surface that smoothly connects the first surface 30 and the second surface 31, and is an example of a "curved surface" involved in the technology of this invention. In addition, although there are multiple radial directions RD, the direction orthogonal to the first surface 30 is defined as radial direction RD here.

[0051] The handle 16 is tapered in shape, tapering from the connecting end 25 towards the releasing end 26. More specifically, as... Figure 4 As shown, the handle 16 is shaped by virtually cutting a portion (approximately half) of the elongated elliptic PS (shown by the double-dotted line) along the same direction as the radial direction RD, i.e., the minor axis direction SAD. In the following description, the portion of the handle 16 on the release end 26 side that has a tapered surface is referred to as the tapered portion 33. Furthermore, the elongated elliptic PS refers to a solid obtained by rotating an ellipse about its major axis; a rugby ball is a representative example.

[0052] like Figure 4 As shown by the shaded line HC, the recess 24 is formed by carving out or cutting away a portion of the handle 16, which is shaped by cutting approximately half of the elongated ellipse PS along the minor axis direction SAD. Therefore, the recess 24 can also be described as a carved-out portion or a cut-away portion. Furthermore, the recess 24 is a stepped difference created by carving out or cutting away a portion of the handle 16. Therefore, the recess 24 can also be described as a stepped difference portion.

[0053] like Figure 3 As shown, the length LCAD of the connecting portion 14 along the axial direction AD is shorter than the length LGAD of the handle 16 along the axial direction AD (LCAD < LGAD). Furthermore, as... Figure 4 As shown, the length LGAD of the handle 16 along the axial direction AD is more than 1.2 times and less than 1.5 times the length LGRD of the handle 16 along the radial direction RD (1.2LGRD≤LGAD<1.5LGRD). Furthermore, the length LGAD of the handle 16 along the axial direction AD is more than 40 mm and less than 70 mm (40mm≤LGAD<70mm). For example, the length LGAD of the handle 16 along the axial direction AD is 57 mm, and the length LGRD of the handle 16 along the radial direction RD is 42 mm. In this case, LGAD≈1.36LGRD, thus satisfying the condition 1.2LGRD≤LGAD<1.5LGRD mentioned above. Furthermore, the condition 40mm≤LGAD<70mm also applies.

[0054] As an example, such as Figure 5 As shown, when operating the cannula 10, the operator hooks their finger F of hand H onto the recess 24 of handle 16. Figure 5 The example illustrates a case where the thumb is hooked onto one of the recesses 24 and the fingers other than the thumb are hooked onto the other recess 24. More specifically, the tip of the thumb abuts against the second surface 31 of one of the recesses 24, and the pad of the thumb contacts the first surface 30 and the connecting surface 32 of one of the recesses 24. Furthermore, the tip of at least one finger other than the thumb, such as the middle finger, abuts against the second surface 31 of the other recess 24, and the pad of the other finger contacts the first surface 30 and the connecting surface 32 of the other recess 24.

[0055] Figure 5 This describes the situation just before the shaft 15, along with the cannula 11, is pierced into the body wall BW. The operator approaches the body wall BW with a forceful downward drop from a roughly vertical direction. Depending on the situation, the cannula 10 is rotated circumferentially CD until the connecting portion 14 reaches the surface of the body wall BW, thus piercing the shaft 15 into the body wall BW. The portion of the body wall BW that pierces the shaft 15 can also be pre-cut with a scalpel. The body wall BW can be, for example, the abdominal wall.

[0056] Figure 6 This refers to the situation where the shaft 15 is pierced into the body wall BW until the connecting part 14 reaches the surface of the body wall BW, and then the plug 12 is separated from the sleeve 11, leaving only the sleeve 11 in the body wall BW. At this time, the operator... Figure 5 The grip shown is now replaced with the grip illustrated in the diagram where the palm encircles the handle 16, especially the conical portion 33. More specifically, the operator inserts their thumb into the area between the two recesses 24 where the button 20 is located, and wraps their index, middle, and ring fingers around the other recess 24, overlapping them. Furthermore, the little finger overlaps the ring finger. The operator operates the button 20 with the tip of their thumb, as shown by the dotted lines, to disconnect the connection between the connecting portion 14 and the handle 16, i.e., the connection between the sleeve 11 and the obstructor 12. Then, the operator pulls out the obstructor 12 in the opposite direction to the direction in which the shaft 15 is pierced into the body wall BW, thereby separating the obstructor 12 from the sleeve 11, leaving only the sleeve 11 in the body wall BW. Furthermore, as can be seen from the above description, the conical portion 33 can also be described as a palm-encircling portion. And, the conical portion 33 can also be described as a curved portion.

[0057] Figure 7 This is a flowchart illustrating the operating sequence of the cannula 10. First, the operator installs the cannula 11 onto the plug 12 (step ST100). At this time, the operator adjusts the position of the cannula 11 and the plug 12 on the circumferential CD so that the protrusion 28 engages with the groove 21 and the button 20 is accommodated in the notch 27.

[0058] Next, as Figure 5 As shown, the operator holds the handle 16 by hooking his finger F into the recess 24 of the handle 16, while simultaneously piercing the shaft 15 together with the sleeve 11 into the body wall BW (step ST110).

[0059] After the shaft 15 is pierced into the body wall BW until the connecting part 14 reaches the surface of the body wall BW, as follows: Figure 6 As shown, the operator operates button 20 to detach the occluder 12 from the cannula 11, leaving only the cannula 11 in the body wall BW (step ST120). The operator then inserts an endoscope and / or treatment instruments into the insertion holes 17 and 18 of the cannula 11 and performs surgery on the patient.

[0060] As described above, the blocking device 12 includes a shaft 15, a handle 16, and a recess 24. The shaft 15 is inserted into the sleeve 11, and its tip 22 is needle-shaped for piercing the body wall BW. The handle 16 is fitted with the base end 23 of the shaft 15 for the operator to hold. Two recesses 24 are formed in the handle 16 for the operator's fingers to hook onto. Therefore, compared with the blocking device described in Japanese Patent Application Publication No. 2003-047618, which has only one recess on one side of the handle, the blocking device 12 can further improve operational stability.

[0061] like Figure 1 As shown, two recesses 24 are formed at opposite positions on the handle 16. Therefore, the handle 16 can be made into a simple and symmetrical shape.

[0062] like Figure 3 As shown, the recess 24 has a first surface 30 formed along the axial direction AD of the shaft 15 and a second surface 31 connected to the first surface 30 at the end of the handle on which the base end 23 of the shaft 15 is mounted, i.e., the connecting end 25. The second surface 31 intersects with the first surface 30. According to the first surface 30, when the shaft 15 is pierced into the body wall BW, the force that causes the shaft 15 to rotate in the circumferential direction CD can be effectively transmitted. Furthermore, according to the second surface 31, when the shaft 15 is pierced into the body wall BW, the force that presses the shaft 15 in the piercing direction can be effectively transmitted.

[0063] like Figure 3 As shown, the first surface 30 and the second surface 31 are connected by a curved connecting surface 32. Therefore, compared to the case where the first surface 30 and the second surface 31 are connected at an angle, a force that rotates the shaft 15 in the circumferential direction CD towards the first surface 30 and a force that presses the shaft 15 in the piercing direction towards the second surface 31 can be smoothly applied with one finger. Furthermore, compared to the case where the first surface 30 and the second surface 31 are connected at an angle, dust accumulation at the connecting portion of the first surface 30 and the second surface 31 can be prevented. In addition, compared to the case where the first surface 30 and the second surface 31 are connected at an angle, the connecting portion of the first surface 30 and the second surface 31 can be easily cleaned. Therefore, the cleanliness of the connecting portion of the first surface 30 and the second surface 31 can be maintained.

[0064] like Figure 1 As shown, the handle 16 has a tapered shape (tapered portion 33) that tapers from the connecting end 25 toward the releasing end 26. This shape is suitable for the gripping shape of the hand H, thus making it easy to grip the handle 16 with the hand H. In particular, in Figure 6 The gripping method shown, in which the palm is wrapped around the conical part 33, can fully utilize the effect of being easy to hold with the hand H.

[0065] like Figure 4As shown, the handle 16 is shaped by cutting a portion of an elongated ellipse PS along its minor axis SAD. In this way, the release end 26 of the handle 16 becomes a rounded shape (conical part 33), so even if the palm of the hand H comes into contact with the release end 26, it will not put a burden on the palm.

[0066] like Figure 4 As shown, the length LGAD of the handle 16 along the axial direction AD is more than 1.2 times and less than 1.5 times the length LGRD of the handle 16 along the radial direction RD. If the length LGAD is more than 1.2 times and less than 1.5 times the length LGRD, it is easy to hold the handle 16 by hand H, and thus easy to operate the plug 12 (cannula 10). Conversely, if the length LGAD is less than 1.2 times or more than 1.5 times the length LGRD, it is difficult to hold the handle 16 by hand H, and thus difficult to operate the plug 12 (cannula 10).

[0067] And, as Figure 4 As shown, the length LGAD of the handle 16 along the axial direction AD is 40 mm or more and less than 70 mm. If the length LGAD is 40 mm or more and less than 70 mm, it is easy to hold the handle 16 by hand H, and thus easy to operate the plug 12 (cannula 10). Conversely, if the length LGAD is less than 40 mm or more than 70 mm, it is difficult to hold the handle 16 by hand H, and thus difficult to operate the plug 12 (cannula 10).

[0068] like Figure 1 As shown, the handle 16 has a notch 27 that accommodates at least a portion of the button 20 for disengaging the sleeve 11, and is positioned differently from the recess 24 on the circumferential CD. Therefore, the recess 24 and the notch 27 do not interfere with each other, reducing the risk of accidental operation of the button 20 by a finger F hooked on the recess 24.

[0069] The handle 16 has a protrusion 28 that is connected to the sleeve 11 and is positioned on the circumferential CD corresponding to the recess 24. Therefore, the protrusion 28 is easily visually identifiable when the sleeve 11 is installed on the blocker 12, and the positions of the sleeve 11 and the blocker 12 on the circumferential CD can be easily adjusted so that the protrusion 28 engages with the groove 21.

[0070] like Figure 1 As shown, the sleeve 11 has: a cylindrical sleeve body 13 with an insertion hole 17 for the shaft 15 to be inserted; and a connecting portion 14, on which the base end 19 of the sleeve body 13 is mounted, for the handle 16 to be detachably connected. Figure 3As shown, the axial length LCAD of the connecting portion 14 is shorter than the axial length LGAD of the handle 16. Therefore, the cannula 10 can be operated with a handle 16 that is relatively larger than the connecting portion 14, which improves operational stability compared to the case where the handle 16 is relatively smaller than the connecting portion 14.

[0071] The button 20 for separating the sleeve 11 from the blocker 12 can also be provided on the handle 16 instead of the connecting part 14. Furthermore, the notch 27 may also be omitted.

[0072] The following shows a modified example of the handle. Furthermore, the following mainly describes the parts that differ from the embodiments described above, while parts that are the same as or need no difference from the embodiments described above are marked with the same symbols as in the embodiments described above and their descriptions are omitted.

[0073] As an example, Figure 8 The recess 51 of the handle 50 shown has a first surface 52 formed by a curved surface protruding inward. Conversely, as an example, Figure 9 The recess 56 of the handle 55 shown has a first surface 57 formed by a curved surface protruding outwards. According to Figure 8 The recess 51 shown has a first surface 52 that conforms to the shape of the fingertip of finger F, thus improving the fit of finger F. In contrast, according to... Figure 9 The recess 56 shown has a first surface 57 that is more suitable for the gripping shape of the hand H, making it easier to grip with the hand H.

[0074] exist Figure 8 and Figure 9 The example shown illustrates the recesses 51 and 56 on the first surfaces 52 and 57, which are formed by curved surfaces, but is not limited to this. As an example, it could also be as follows... Figure 10 Like the recess 61 of the handle 60 shown, it has a second surface 62 formed by a curved surface protruding toward the connecting end 25. According to the recess 61, the second surface 62 conforms to the shape of the fingertip, thus improving the fit of the finger F. Alternatively, the second surface 62 could also be a curved surface protruding toward the release end 26, in contrast to the first surface 62. Thus, at least one of the first and second surfaces can include a curved surface.

[0075] As an example, Figure 11 The recess 66 of the handle 65 shown has a first surface 67 that slopes inward toward the connecting end 25. According to this recess 66, the first surface 67 is shaped to better suit the gripping shape of the hand H, making it easier to grip with the hand H. Thus, the first surface does not necessarily have to be approximately parallel to the axis AD. The same applies to the second surface. The key point is that the first and second surfaces intersect.

[0076] Furthermore, as an example, Figure 12The recess 71 of the handle 70 shown has a deep-cut surface 72. The deep-cut surface 72 is a surface that is cut inward at the connection between the first surface 30 and the second surface 31. The deep-cut surface 72 is an example of the "curved surface" involved in the technology of this invention. According to this recess 71, force can be effectively transmitted in various gripping methods, such as gripping by placing fingertips into the deep-cut surface 72 or gripping by wrapping the index finger and thumb around the deep-cut surface 72.

[0077] So far, the shape of the handle has been exemplified by cutting a portion of an elongated ellipse PS along the short axis direction SAD, but it is not limited to this.

[0078] This can also be taken as an example. Figure 13 The handle 75 shown is an example. Figure 14 The handle 80 shown is an example. Figure 15 As shown in the diagram, handle 85 is shaped like a frustum. A frustum is a solid formed by cutting a cone with a plane parallel to its base and removing the smaller conical portion; pudding is a representative example. The frustum shape is also suitable for the grip of the hand, making it easy to hold handles 75, 80, and 85 with the hand. These frustum-shaped handles 75, 80, and 85 also allow for... Figure 6 The gripping method shown, where the palm is placed over the tapered part 33, fully utilizes the ease of holding the handle with the hand. Furthermore, similar to handle 16, the corners of handles 75, 80, and 85 are rounded by a chamfering process.

[0079] Figure 13 The recess 76 of the handle 75 shown has the same first surface 30, second surface 31 and connecting surface 32 as the handle 16. Figure 14 The recess 81 of the handle 80 shown has a first surface 82 formed by a curved surface protruding inward. Alternatively, instead of the first surface 82, it may be as follows: Figure 9 The first surface 57 shown is composed of curved surfaces that bulge outwards. Furthermore, it can also replace the second surface 31 as follows: Figure 10 The second surface 62 shown is a second surface composed of a curved surface protruding toward the connecting end 25. Alternatively, it can be as follows: Figure 11 As shown in the diagram, the first surface 67 is inclined inwards towards the connecting end 25, and it can also be made of, for example... Figure 12 The curved surface, as shown in the deep excavation surface 72, connects the first and second surfaces.

[0080] Figure 15 The recess 86 of the handle 85 shown has a first surface 87 extending from the near-front side of the connecting end 25 to the releasing end 26. Based on this first surface 87, it is easy for a finger F to slide into the recess 86.

[0081] This can also be taken as an example. Figure 16The handle 90 shown is an example. Figure 17 The handle 95 shown is cylindrical. Compared to shapes formed by cutting a portion of an elongated ellipse PS along its minor axis (SAD) or a frustum shape, the cylindrical handles 90 and 95 are easier to manufacture. Furthermore, similar to handle 16, the corners of handles 90 and 95 are rounded by chamfering.

[0082] Figure 16 The recess 91 of the handle 90 shown has the same first surface 30, second surface 31 and connecting surface 32 as the handles 16 and 75. Figure 17 The recess 96 of the handle 95 shown has a first surface 97 formed by a curved surface protruding inward. Alternatively, instead of the first surface 97, it may be as follows: Figure 9 The first surface 57 shown is composed of curved surfaces that bulge outwards. Furthermore, it can also replace the second surface 31 as follows: Figure 10 The second surface 62 shown is a second surface composed of a curved surface protruding toward the connecting end 25. Alternatively, it can be as follows: Figure 11 As shown in the diagram, the first surface 67 is inclined inwards towards the connecting end 25, and it can also be made of, for example... Figure 12 The curved surface, as shown in the deep-cut surface 72, connects the first and second surfaces. Furthermore, it can also be like... Figure 15 As shown in the first face 87, it extends from the front side of the connection end 25 to the release end 26.

[0083] There may be no second side. For example, [example 1] can be used. Figure 18 The handle 100 shown has a C-shaped first surface 102 extending from the connecting end 25 to the releasing end 26, just like the recess 101 of the handle 100.

[0084] The handle can also be shaped like a frustum or a prism. In these cases, the recess has a third surface intersecting the first and second surfaces, in addition to the first and second surfaces. Furthermore, the number of recesses is not limited to two. For example, three recesses can be formed at 120° intervals when viewed from the axis AD.

[0085] The technology of this invention can also be appropriately combined with the various embodiments and / or variations described above. Furthermore, it is not limited to the embodiments described above; various structures can certainly be adopted as long as they do not depart from the spirit of the invention.

[0086] The descriptions and illustrations above are detailed explanations of the parts related to the technology of this invention, and are merely one example of the technology of this invention. For example, the descriptions related to the structure, function, effect, and effect described above are examples of the structure, function, effect, and effect of the parts related to the technology of this invention. Therefore, without departing from the spirit of this invention, unnecessary parts may be deleted from the descriptions and illustrations above, or new elements may be added or replaced. Furthermore, to avoid complications and to facilitate understanding of the parts related to the technology of this invention, descriptions related to common technical knowledge that are not particularly necessary to explain in terms of enabling the implementation of this invention have been omitted from the descriptions and illustrations above.

[0087] In this specification, "A and / or B" has the same meaning as "at least one of A and B". That is, "A and / or B" can mean only A, only B, or a combination of A and B. Furthermore, in this specification, the same approach applies to situations where three or more items are connected by "and / or".

[0088] All documents, patent applications and technical standards described in this specification are incorporated herein by reference to the same extent as the individual documents, patent applications and technical standards specifically and separately described and incorporated by reference.

Claims

1. An obstructor comprising: a shaft inserted into a sleeve, and a needle-shaped tip for piercing the body wall; A handle, with the base end of the shaft mounted on it, for the operator to hold; and The handle has at least two recesses for the operator's fingers to hook onto. Two recesses are formed at positions opposite to the handle. The recess has at least the following characteristics: The first surface is formed along the axial direction of the axis; and Secondly, one end of the handle, which is the connecting end side where the base end of the shaft is mounted, is connected to and intersects with the first surface. The first surface is parallel to the axial direction, and the second surface is parallel to the radial direction. The first surface and the second surface are connected by a curved surface. When one end of the handle, to which the shaft is mounted, is designated as the connecting end, and the other end of the handle, on the opposite side of the connecting end, is designated as the releasing end, the handle takes on a tapered shape that tapers from the connecting end toward the releasing end. The handle is shaped like a frustum formed by cutting a portion of an elongated ellipse along its minor axis.

2. The blocker according to claim 1, wherein, At least one of the first surface and the second surface contains a curved surface.

3. The blocker according to claim 1, wherein, The first surface extends from the front of the connecting end to the other end of the handle, i.e., the release end, on the side opposite to the connecting end.

4. The blocker according to claim 1 or 2, wherein, The handle is cylindrical.

5. The blocker according to claim 1 or 2, wherein, The length of the handle along the axial direction of the axis is more than 1.2 times and less than 1.5 times the length of the handle along the radial direction of the axis.

6. The blocker according to claim 1 or 2, wherein, The length of the handle along the axial direction of the shaft is 40 mm or more and less than 70 mm.

7. The blocker according to claim 1 or 2, wherein, The handle has a notch that accommodates at least a portion of a button for cutting the sleeve, and is positioned differently from the recess in the circumferential direction of the shaft.

8. The blocker according to claim 1 or 2, wherein, The handle has a protrusion that is connected to the sleeve and is positioned in the circumferential direction of the shaft corresponding to the recess.

9. A cannula, comprising: The blocker according to any one of claims 1 to 8; and A sleeve is provided for the removable insertion of the blocker.

10. The cannula according to claim 9, wherein, The sleeve has: A cylindrical sleeve body has an insertion hole for the shaft to be inserted; and The connecting part has the base end of the sleeve body installed, which is detachably connected to the handle, and its length along the axial direction of the shaft is shorter than that of the handle.

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