A steerable sheath

Abstract

A controllable sheath belongs to the technical field of medical devices, comprising: a sheath body, an insertion end of the sheath body being provided with a deflectable sheath head; a driving mechanism, the driving mechanism comprising: a rotating control member and a linear motion mechanism driven by the rotating control member, the linear motion mechanism being connected to the sheath head to drive the sheath head to deflect and bend. The present invention provides a linear motion mechanism to connect the rotating control member and the sheath head, so that the motion that drives the sheath head to deflect and bend is converted from a rotating motion to a linear motion. The transmission structure for realizing the conversion provides a method for changing the rotatable angle of the rotating control member. By changing the rotatable angle of the rotating control member, the required rotation angle of the rotating control member corresponding to a certain bending angle of the sheath head is made more reasonable, thereby improving the deflection accuracy of the sheath head and improving the controllability.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a manipulable sheath. Background Art

[0002] A sheath is a medical device that establishes an access channel through the skin to the blood vessel lumen. The function of the sheath is to facilitate the repeated delivery or exchange of medical devices such as sheath cores into the blood vessels, and to protect the blood vessels during the repeated entry and exit of the medical devices. The sheath is applicable to various medical fields. For example, in cryoablation, the sheath is intended to introduce various cardiovascular catheters into the heart, including the left side of the heart through the atrial septum, to provide a passage for other treatment materials such as sheath cores, dilators, and cryoballoon catheters;

[0003] The existing steerable sheath adopts a method in which a knob is directly connected to the guide wire used to pull the sheath head to deflect and bend. By turning the knob set on the handheld part, the guide wire is directly pulled to be wound around the circumference of the knob to achieve retraction and release, thereby driving the sheath head to deflect and bend. However, since the deflection and bending action of the sheath head is performed in the blood vessel cavity, the deflection and bending angle will not be very large, and since the volume and structure of the instrument itself is small, only a small length of the guide wire needs to be retracted to make the sheath head deflect and bend to a specified angle, so that the knob only needs to be rotated a small angle to wind or release the required length of the guide wire along the knob shaft. Therefore, the rotatable angle of the knob of the existing steerable sheath is relatively small (mostly 90 degrees), which requires the operator to carefully turn the knob when using the steerable sheath to prevent the knob from being turned too large or too small, causing the sheath head to deflect and bend too much or not in place. However, the method of increasing the rotation angle range by reducing the size of the knob shaft will not only increase the difficulty of operation for users, but also cause the guide wire to be plastically deformed and unable to recover and straighten. Therefore, the existing steerable sheath cannot increase the rotation angle of the knob by reducing the diameter of the knob, thereby improving the operation accuracy of the steerable sheath. As a result, the deflection control accuracy of the existing steerable sheath is not high and the controllability is poor. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the knob is directly connected to the guide wire used to pull the sheath head to deflect and bend, resulting in low deflection control accuracy and poor controllability of the sheath head, thereby providing a controllable sheath.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A steerable sheath, comprising:

[0007] A sheath body, wherein the insertion end of the sheath body is provided with a deflectable sheath head;

[0008] The driving mechanism comprises: a rotating control member and a linear motion mechanism driven by the rotating control member, wherein the linear motion mechanism is connected to the sheath head to drive the sheath head to deflect and bend.

[0009] Optionally, the linear motion mechanism includes: a sliding rod arranged along the length direction of the sheath body, and the rotary control member is connected to the sliding rod through a threaded structure to drive the sliding rod to extend and retract along the length direction.

[0010] Optionally, the rotary control member is a rotating sleeve sleeved on the sliding rod; the inner cavity wall of the rotating sleeve and the outer wall of the sliding rod are provided with mutually matching threads.

[0011] Optionally, the steerable sheath further comprises: a limiting mechanism for preventing the sliding rod from rotating relative to the sliding rod along its circumferential direction.

[0012] Optionally, the manipulable sheath also includes: a fixing portion, which is connected to the driving mechanism, and the limiting mechanism is arranged on the fixing portion, which includes: a guide rail extending along the telescopic direction of the sliding rod, and the guide rail and the sliding rod are connected by a matching snap-fit ​​connection to limit the movement of the sliding rod along the guide rail.

[0013] Optionally, one of the guide rail and the sliding rod is provided with a strip-shaped protrusion, and the other of the guide rail and the sliding rod is provided with a strip-shaped groove which is plug-fitted and connected with the strip-shaped protrusion.

[0014] Optionally, the limiting mechanism further includes: connecting surfaces respectively arranged on the fixing portion and the sliding rod and abutting against each other to prevent the sliding rod from rotating along its circumferential direction.

[0015] Optionally, the connecting surface is located on the opposite side of the guide rail on the sliding rod.

[0016] Optionally, the fixing portion is located at an end of the driving mechanism away from the sheath head, and the fixing portion is used for an operator to hold.

[0017] Optionally, a sheath is provided at one end of the driving mechanism close to the sheath head to prevent the sheath body from generating a stress concentration point at that location.

[0018] Optionally, the fixing portion includes a first cover body and a second cover body that are assembled and connected; and / or the rotating sleeve includes a first knob cover and a second knob cover that are assembled and connected.

[0019] Optionally, the sliding rod is a hollow tubular structure, and the sheath body passes through the inner cavity of the sliding rod.

[0020] Optionally, the sliding rod is connected to the sheath head via a guide wire, and the sliding rod is provided with a connecting hole for the guide wire to pass through and fixedly connected to the sliding rod.

[0021] The technical solution of the present invention has the following advantages:

[0022] 1. The steerable sheath provided by the present invention comprises: a sheath body, the insertion end of the sheath body is provided with a deflectable sheath head; a driving mechanism, the driving mechanism comprises: a rotating control member and a linear motion mechanism driven by the rotating control member, the linear motion mechanism is connected to the sheath head to drive the sheath head to deflect and bend.

[0023] By setting a linear motion mechanism to connect the rotary control member and the sheath head, the motion that drives the sheath head to deflect and bend is converted from rotary motion to linear motion, and the transmission structure that realizes the conversion provides a way to change the rotatable angle of the rotary control member. Compared with the prior art in which the control member and the sheath head are directly connected, the speed change function cannot be realized between the two. The rotary control member in the present invention indirectly drives the sheath head to bend through the linear motion mechanism, so a certain deceleration mechanism can be set between the rotary control member and the linear motion mechanism, thereby increasing the adjustment range of the rotary control member. By changing the rotatable angle of the rotary control member, the required rotation angle of the rotary control member corresponding to the bending angle of the sheath head is made more reasonable, thereby improving the deflection accuracy of the sheath head and improving the controllability.

[0024] 2. The controllable sheath provided by the present invention has a linear motion mechanism comprising: a sliding rod arranged along the length direction of the sheath body, and the rotating control member is connected to the sliding rod through a threaded structure to drive the sliding rod to extend and retract along its length direction.

[0025] The rotating control member is transmitted through the cooperation of the sliding rod with the threaded structure. The pitch setting of the threaded structure can change the rotatable angle of the rotating control member, thereby improving the deflection accuracy of the sheath head and improving the controllability. The sliding rod telescopes along the length direction of the sheath body to avoid plastic deformation.

[0026] 3. The steerable sheath provided by the present invention has a rotating control member which is a rotating sleeve sleeved on the sliding rod; the inner cavity wall of the rotating sleeve and the outer wall of the sliding rod are provided with mutually matching threads.

[0027] This connection structure is more compact and at the same time increases the volume of the rotating control member, which is conducive to rotation and improves controllability.

[0028] 4. The steerable sheath provided by the present invention further includes: a limiting mechanism for preventing the sliding rod from rotating relative to the sliding rod along its circumferential direction.

[0029] The limiting mechanism blocks the sliding rod from rotating relatively along its circumferential direction, so that the transmission process in which the rotating sleeve rotates to drive the sliding rod to move is more stable and reliable.

[0030] 5. The manipulable sheath provided by the present invention also includes: a fixing part, which is connected to the driving mechanism, and the limiting mechanism is arranged on the fixing part, which includes: a guide rail extending along the extension and retraction direction of the sliding rod, and the guide rail and the sliding rod are connected by a matching snap-fit ​​connection to limit the movement of the sliding rod along the guide rail.

[0031] While blocking the sliding rod from rotating relative to itself in its circumferential direction, the guide rail can also limit the movement of the sliding rod along the guide rail, making the telescopic movement of the sliding rod more stable. In addition, the length of the guide rail can also limit the telescopic movement stroke of the sliding rod, thereby limiting the angle range of deflection and bending of the sheath head.

[0032] 6. The limiting mechanism of the manipulable sheath provided by the present invention further includes: connecting surfaces respectively arranged on the fixing portion and the sliding rod and abutting against each other to prevent the sliding rod from rotating along its circumferential direction.

[0033] The friction force of the connection surface is relatively small, which can prevent the sliding rod from rotating relatively along its circumferential direction while avoiding as much as possible the influence of friction on the telescopic movement of the sliding rod.

[0034] 7. The connection surface of the manipulable sheath provided by the present invention is located on the opposite side of the guide rail on the sliding rod.

[0035] The connecting surface is arranged opposite to the guide rail, and can block the sliding rod from rotating along its circumferential direction and limit the position of the sliding rod to prevent it from moving.

[0036] 8. The steerable sheath provided by the present invention has a fixing portion located at an end of the driving mechanism away from the sheath head, and the fixing portion is used for holding by an operator.

[0037] The fixing part is located at one end of the driving mechanism away from the sheath tube head, and this position makes it easier for an operator to operate the rotating control member while holding the fixing part.

[0038] 9. In the manipulable sheath provided by the present invention, a sheath is provided at one end of the driving mechanism close to the sheath head, so as to prevent the sheath body from generating a stress concentration point at that location.

[0039] The sheath can protect the sheath body during the insertion of the present invention into the human body, and prevent the sheath body from generating stress concentration points and bending.

[0040] 10. In the manipulable sheath provided by the present invention, the fixing portion comprises a first cover body and a second cover body which are assembled and connected; and / or the rotating sleeve comprises a first knob cover and a second knob cover which are assembled and connected.

[0041] The splicing structure makes it easier to disassemble the fixing portion and / or the rotating sleeve so as to replace other components arranged therein. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a front view of embodiment 1 of the present invention;

[0044] Figure 2 for Figure 1 A cross-sectional view in the AA direction is shown;

[0045] Figure 3 for Figure 1 A cross-sectional view in the BB direction is shown;

[0046] Figure 4 It is a schematic diagram of the three-dimensional structure of Example 1 of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the sheath tube body provided in Example 1 of the present invention;

[0048] Figure 6 It is a schematic structural diagram of the sliding rod provided in Embodiment 1 of the present invention;

[0049] Figure 7 It is a schematic structural diagram of the second knob cover provided in Embodiment 1 of the present invention;

[0050] Figure 8 It is a schematic structural diagram of the first knob cover provided in Embodiment 1 of the present invention;

[0051] Fig. 9 It is a structural schematic diagram of the second cover body provided in Example 1 of the present invention;

[0052] Fig.10 It is a structural schematic diagram of the first cover body provided in Example 1 of the present invention;

[0053] Fig.11 It is a schematic structural diagram of the back cover provided in Embodiment 1 of the present invention;

[0054] Fig.12 It is a schematic structural diagram of the back cover provided in Embodiment 1 of the present invention;

[0055] Fig.13 This is a schematic diagram of the structure of the hemostatic valve provided in Example 1 of the present invention;

[0056] Fig.14 This is a schematic diagram of the structure of the hemostatic valve seat provided in Example 1 of the present invention;

[0057] Fig.15 This is a schematic diagram of the structure of the sheath provided in Example 1 of the present invention.

[0058] Description of reference numerals:

[0059] 1. Sheath body, 11. Insertion end, 12. Fixed end, 13. Guide tube, 14. Guide wire, 2. Driving mechanism, 21. Rotating control member, 211. First knob cover, 212. Second knob cover, 213. First plug rod, 214. First plug hole, 215. First plug flange, 216. First plug groove, 217. Sheet boss, 218. First groove, 219. First flange, 22. Linear motion mechanism, 221. Connecting hole, 3. Limiting mechanism, 31. Strip protrusion, 32. Strip groove, 33. Connecting surface, 4. Fixed part, 41. First cover body, 42. Second cover body, 43. Second plug-in flange, 44. Second plug-in groove, 45. Second groove, 46. Third plug-in groove, 47. Back cover, 471. Third plug-in flange, 472. First accommodating flange, 473. Second accommodating flange, 474. Positioning column, 475. Threaded hole column, 476. Connecting flange, 477. Connecting protrusion, 48. Mounting groove, 5. Sheath, 51. Second flange, 6. Hemostatic valve, 61. Cross cut, 62. Positioning hole, 7. Hemostatic valve seat, 71. Base, 72. Mounting column, 73. Drain port, 74. Sealing flange, 8. Fixed seat, 9. Three-way valve. DETAILED DESCRIPTION

[0060] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] In the description of the present invention, it should be noted that the terms "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used to distinguish components, and cannot be understood as indicating or implying relative importance.

[0062] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0063] Example 1

[0064] This embodiment provides a steerable sheath, such as Figure 1-Figure 15 As shown, including:

[0065] A sheath body 1, an insertion end 11 of the sheath body 1 is provided with a deflectable sheath head;

[0066] A driving mechanism 2, the driving mechanism 2 comprising: a rotating control member 21 and a linear motion mechanism 22 driven thereby, the linear motion mechanism 22 being connected to the sheath head to drive the sheath head to deflect and bend;

[0067] By setting a linear motion mechanism 22 to connect the rotary control member 21 and the sheath head, the motion that drives the sheath head to deflect and bend is converted from rotary motion to linear motion. The transmission structure that realizes the conversion provides a way to change the rotatable angle of the rotary control member 21. By changing the rotatable angle of the rotary control member 21, the required rotation angle of the rotary control member 21 corresponding to the bending of the sheath head at a certain angle is more reasonable, thereby improving the deflection accuracy of the sheath head and improving the controllability.

[0068] Specifically, the rotatable angle of the rotary control member 21 of this embodiment is greater than 90 degrees, and the controllability is best when the rotatable angle of the rotary control member 21 is within the range of 360 degrees to 720 degrees;

[0069] like Figure 5 As shown, one end of the sheath body 1 for inserting into the human body is the insertion end 11, which is provided with a sheath head, and the other end opposite to the insertion end 11 is the fixed end 12, which is used to install a handheld component, and to deliver medical equipment, treatment materials, etc. into the sheath body 1 from the opening of the end, and the outer wall of the sheath body 1 is provided with a guide tube 13 for accommodating a guide wire 14, and the guide wire 14 is connected to the linear motion mechanism 22 and the sheath head, which is used for the linear motion mechanism 22 to drive the sheath head to deflect and bend, and the guide tube 13 is used to guide the guide wire 14 to move;

[0070] The linear motion mechanism 22 is located at the fixed end 12, and includes: a sliding rod arranged along the length direction of the sheath body 1, and the rotating control member 21 is connected with the sliding rod through a threaded structure to drive the sliding rod to extend and retract along the length direction; the rotating control member 21 is transmitted with the sliding rod through a threaded structure, and the pitch setting of the threaded structure can change the rotatable angle of the rotating control member 21, thereby improving the deflection accuracy of the sheath head and improving the controllability, and the sliding rod extends and retracts along the length direction of the sheath body, thereby avoiding the guide wire 14 from being entangled and causing plastic deformation;

[0071] Specifically, the sliding rod is a hollow tubular structure. Figure 6 The sheath body 1 passes through the inner cavity of the sliding rod, the sliding rod is connected to the sheath head through the guide wire 14, and the sliding rod is provided with a connecting hole 221 for the guide wire 14 to pass through and fixedly connected to the sliding rod;

[0072] A modified implementation of the above sliding rod, the sliding rod is a rod-shaped structure arranged parallel to the sheath tube body 1, and one end of the sliding rod is provided with a connecting hole 221;

[0073] The rotating control member 21 is a rotating sleeve sleeved on the sliding rod, which rotates around the axis of the sheath body 1; the inner cavity wall of the rotating sleeve and the outer wall of the sliding rod are provided with mutually adapted threads, and this connection structure is more compact, and at the same time, the volume of the rotating control member 21 becomes larger, which is conducive to rotation and improves the controllability; Figure 7-Figure 8 The rotating sleeve includes a first knob cover 211 and a second knob cover 212 which are assembled and connected. The inner cavity walls of the first knob cover 211 and the second knob cover 212 are both provided with a plurality of sheet-like bosses 217 for setting threads. The first knob cover 211 is provided with a plurality of hollow cylindrical first plug-in rods 213. The second knob cover 212 is provided with a first plug-in hole 214 which is plugged in with the first plug-in rod 213. The side of the second knob cover 212 is provided with a first plug-in flange 215. The side of the first knob cover 211 is provided with a first plug-in groove 216 which is plugged in with the first plug-in flange 215. This assembly structure is easy to disassemble so that other components arranged therein can be replaced. Change; This assembly structure can also be set as the first knob cover 211 is provided with a first plug hole 214 and a first plug flange 215, or the first knob cover 211 is provided with a first plug rod 213 and a first plug flange 215, or the first knob cover 211 is provided with a first plug hole 214 and a first plug groove 216, and the second knob cover 212 is arranged in coordination; the first knob cover 211 and the second knob cover 212 are also provided with a plurality of convex ribs for easy manipulation by the operator; the first knob cover 211 and the second knob cover 212 are provided with a first groove 218 at one end close to the sheath head, and the first knob cover 211 and the second knob cover 212 are provided with a first flange 219 at one end away from the sheath head;

[0074] A modified embodiment of the above-mentioned rotation control member 21, the rotation control member 21 is a threaded rod placed on the sliding rod, and one end of the threaded rod used for rotation control is set in a knob shape, which rotates around the direction perpendicular to the axis of the sheath body 1, and the circumferential outer wall of the threaded rod and the outer wall of the sliding rod are provided with mutually adapted threads;

[0075] The driving mechanism 2 is provided with a sheath 5 at one end thereof close to the sheath head. Fig.15 The sheath 5 is provided with a passage for the sheath body 1 to pass through, and the sheath 5 is fixed to the sheath body 1. A second flange 51 is provided at one end of the sheath 5. The second flange 51 is rotatably engaged with the first groove 218. The sheath can protect the sheath body 1 during the insertion of the embodiment into the human body, and prevent the sheath body 1 from bending due to stress concentration points;

[0076] The present embodiment provides a steerable sheath, further comprising:

[0077] A limiting mechanism 3, used to prevent the sliding rod from rotating relative to the sliding rod along its circumferential direction;

[0078] A fixing portion 4, the fixing portion 4 is connected to the driving mechanism 2, and is located at an end of the driving mechanism 2 away from the sheath head, and the fixing portion 4 is used for holding by an operator, and this position makes it easier for the operator to operate the rotating control member 21 while holding the fixing portion 4;

[0079] The limiting mechanism 3 is arranged on the fixing portion 4. Figure 9-10, which includes: a guide rail extending along the telescopic direction of the sliding rod, the guide rail and the sliding rod are connected in a matching and snap-fitting manner to limit the movement of the sliding rod along the guide rail, and the length of the guide rail can also limit the telescopic movement stroke of the sliding rod, thereby limiting the angle range of the deflection and bending of the sheath head; a strip protrusion 31 is provided on the sliding rod, and a strip groove 32 is provided on the guide rail that is connected to the strip protrusion 31 in a matching and plug-in manner; it can also be configured that the guide rail is provided with a strip protrusion 31, and the sliding rod is provided with a strip groove 32; the limiting mechanism 3 also includes: respectively provided on the fixing portion 4 and the The connecting surfaces 33 on the sliding rod are mutually abutted and connected to prevent the sliding rod from rotating along its circumferential direction. The connecting surface 33 is located on the opposite side of the guide rail on the sliding rod. The connecting surface 33 of the fixing part 4 is located on the limiting boss in the inner cavity of the fixing part 4. The limiting boss and the guide rail are relatively arranged, which can limit the position of the sliding rod and prevent it from moving; the limiting boss and the guide rail can be arranged to have the same structure to facilitate the installation of the sliding rod; the friction force of the connecting surface 33 is small, which can prevent the sliding rod from rotating relatively along its circumferential direction while avoiding the influence of friction on the telescopic movement of the sliding rod as much as possible;

[0080] like Figure 9-10 As shown, the fixing portion 4 includes a first cover body 41, a second cover body 42 and a back cover 47 which are assembled and connected. The first cover body 41 is provided with a plurality of solid cylindrical second plug-in rods, the second cover body 42 is provided with a second plug-in hole which cooperates with the second plug-in rod, the side of the second cover body 42 is provided with a second plug-in flange 43, and the side of the first cover body 41 is provided with a second plug-in groove 44 which cooperates with the second plug-in flange 43. This assembly structure is easy to disassemble so as to replace other components arranged therein; this assembly structure can also adopt the first cover body 41 provided with a second plug-in hole and a second plug-in flange 43, or the first cover body 41 is provided with a second plug-in rod and a second plug-in flange 43, or the first cover body 41 is provided with a second plug-in hole and a second plug-in groove 44. The plug-in groove 44, the second cover body 42 is arranged in cooperation with the first cover body 41; the middle part of the inner cavity of the first cover body 41 and the second cover body 42 is provided with a mounting groove 48 for fixing the fixing seat 8, and the first cover body 41 and the second cover body 42 are provided with a second groove 45 at one end close to the sheath head, and the second groove 45 is rotatably engaged with the first flange 219, so that the rotating sleeve and the fixing part 4 are rotatably connected; the first cover body 41 and the second cover body 42 are provided with a third plug-in groove 46 at one end away from the sheath head, and the third plug-in groove 46 is located on the inner wall of the first cover body 41 and the second cover body 42, and is used to be engaged with the third plug-in flange 471 of the rear cover 47. This assembly structure is easy to disassemble so as to replace other components arranged therein;

[0081] The rear cover 47 is provided with an opening, Figure 11-Figure 12A first accommodating flange 472 is provided at the opening edge of the inner side of the rear cover 47, and a second accommodating flange 473 surrounds the first accommodating flange 472. The space between the first accommodating flange 472 and the second accommodating flange 473 is used to clamp the hemostatic valve 6, and a plurality of positioning columns 474 are provided between the first accommodating flange 472 and the second accommodating flange 473. A plurality of threaded hole columns 475 are also provided on the inner side of the rear cover 47 for fixing and installing the hemostatic valve seat 7 by screws. A connecting flange 476 surrounding the opening is provided on the outer side of the rear cover 47, and a connecting protrusion 477 is provided on the connecting flange 476. The connecting flange 476 and the connecting protrusion 477 are used to fix the sheath core to the rear cover 47.

[0082] The fixing seat 8 is a sleeve structure, refer to Figure 2 , its outer wall is provided with a boss for inserting into the mounting groove 48, its internal channel is used to pass through the sheath body 1, and the fixing seat 8 supports the sheath body 1;

[0083] like Figure 2 and Fig.13 As shown, the hemostatic valve 6 is made of soft material, and a cross cutout 61 is provided in the middle to facilitate the passage of the sheath core, dilator, cryoballoon catheter, etc., and at the same time has a sealing effect to prevent blood from flowing out; the hemostatic valve 6 is also provided with a plurality of positioning holes 62 for inserting the positioning column 474, so that the hemostatic valve 6 is fixed in the space between the first accommodating flange 472 and the second accommodating flange 473, and the hemostatic valve 6 is tightly fitted with the first accommodating flange 472, the second accommodating flange 473 and the bottom surface of the space. The function of the hemostatic valve 6 is to prevent blood from flowing out, so as to reduce blood loss during the introduction and replacement of the sheath body 1;

[0084] like Figure 2 and Fig.14 As shown, the hemostatic valve seat 7 includes a base 71 and a mounting column 72 located on one side of the base 71. The base 71 is provided with a hole that matches the threaded hole column 475. The mounting column 72 is used to insert the sheath body 1 so that the sheath body 1 is connected to the inner cavity of the base 71. The side wall of the base 71 is provided with an outlet 73 for connecting the three-way valve 9 through a pipeline so that the inner cavity of the base 71 is connected to the three-way valve 9. The three-way valve 9 can be used for exhaust, infusion and blood collection; an opening is provided on the other side of the base 71, and a sealing flange 74 is provided at the opening. When the hemostatic valve seat 7 and the rear cover 47 are installed, the base 71 presses the hemostatic valve 6 so that the sealing flange 74 is embedded in the hemostatic valve 6.

[0085] Of course, the present invention does not impose any specific restrictions on the rotary control member 21 and the linear motion mechanism 22. In other embodiments, the rotary control member 21 is a gear structure, and the linear motion mechanism 22 is a rack structure.

[0086] In addition, the present invention does not impose any specific restrictions on the assembly structure of the first knob cover 211 and the second knob cover 212 and the assembly structure of the first cover body 41 and the second cover body 42. In other embodiments, multiple groups of bosses and grooves perpendicular to the axial direction of the sheath body 1 may be used for clamping, and slide rails and slide grooves parallel to the axial direction of the sheath body 1 may be used for connection.

[0087] In addition, the present invention does not impose any specific restrictions on the assembly structure of the rear cover 47 and the first cover body 41 and the second cover body 42. In other embodiments, threaded connection may also be used.

[0088] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A steerable sheath, characterized in that: include: A sheath body (1), wherein an insertion end (11) of the sheath body (1) is provided with a deflectable sheath head; A driving mechanism (2), the driving mechanism (2) comprising: a rotating control member (21) and a linear motion mechanism (22) driven thereby, the linear motion mechanism (22) being connected to the sheath tube head to drive the sheath tube head to deflect and bend; The linear motion mechanism (22) comprises: a sliding rod arranged along the length direction of the sheath tube body (1); the rotary control member (21) is connected to the sliding rod through a threaded structure to drive the sliding rod to extend and retract along the length direction; A limiting mechanism (3) is used to prevent the sliding rod from rotating relative to the sliding rod in its circumferential direction; a fixing portion (4), the fixing portion (4) is connected to the driving mechanism (2), and the limiting mechanism (3) is arranged on the fixing portion (4), and comprises: a guide rail extending along the telescopic direction of the sliding rod, the guide rail and the sliding rod are connected in a matching and snap-fitting manner to limit the movement of the sliding rod along the guide rail; and one of the guide rail and the sliding rod is provided with a strip protrusion (31), and the other of the guide rail and the sliding rod is provided with a strip groove (32) that is connected in a matching and plug-fitting manner to the strip protrusion (31); The limiting mechanism also includes: connecting surfaces (33) respectively arranged on the fixing portion (4) and the sliding rod and abutting against each other to prevent the sliding rod from rotating along its circumferential direction.

2. The steerable sheath according to claim 1, characterized in that: The rotary control member (21) is a rotating sleeve sleeved on the sliding rod; the inner cavity wall of the rotating sleeve and the outer wall of the sliding rod are provided with mutually matching threads.

3. The steerable sheath according to claim 1, characterized in that: The connecting surface (33) is located on the opposite side of the guide rail on the sliding rod.

4. The steerable sheath according to claim 1, characterized in that: The fixing portion (4) is located at an end of the driving mechanism (2) away from the sheath tube head, and the fixing portion (4) For operator to hold.

5. The steerable sheath according to claim 4, characterized in that: The drive mechanism (2) is provided with a sheath (5) at one end close to the sheath head, which is used to prevent the sheath body (1) from generating a stress concentration point at that location.

6. The steerable sheath according to claim 1, characterized in that: The fixing portion (4) comprises a first cover body (41) and a second cover body (42) which are assembled and connected; and / or the rotating sleeve comprises a first knob cover (211) and a second knob cover (212) which are assembled and connected.

7. The steerable sheath according to any one of claims 1 to 6, characterized in that: The sliding rod is a hollow tubular structure, and the sheath tube body (1) passes through the inner cavity of the sliding rod.

8. The steerable sheath according to any one of claims 1 to 6, characterized in that: The sliding rod is connected to the sheath tube head via a guide wire (14), and the sliding rod is provided with a connecting hole (221) through which the guide wire (14) passes and which is fixedly connected to the sliding rod.

Images