A cam-adjustable curved sheath tube

Abstract

The present invention provides a cam-adjustable bending sheath tube, which comprises a catheter, a traction wire and a handle assembly. The handle assembly includes a positioning sleeve, a cam and a sliding member. Two opposite bending holes are provided on the side wall of the catheter, and the bending holes extend along the axial direction of the catheter. The positioning sleeve is sleeved outside the catheter. The cam is sleeved outside the positioning sleeve, and the cam can rotate relative to the positioning sleeve around its own axis. The end face of the proximal end of the cam is arranged at an angle with the axis of the cam. Two sliding members are relatively arranged on the side wall of the positioning sleeve. The sliding member can move along the axial direction of the positioning sleeve. The sliding member is movably connected with the end face of the proximal end of the cam. The traction wire is arranged in the bending hole, and the traction wires in the two bending holes are respectively connected with the two sliding members. For the cam-adjustable bending sheath tube of the present invention, by rotating the cylindrical cam, two sliding members can be driven to move in opposite directions, and then the two traction wires can be pulled or released to control the bending change of the distal end of the catheter.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular, to a cam adjustable bending sheath tube. Background Art

[0002] Using a medical sheath tube for minimally invasive interventional surgery in human blood vessels is a treatment method with small surgical trauma, fast postoperative healing, high surgical success rate, and wide application range at present. The medical sheath tube is used to establish a channel, transport or retrieve instruments, input drugs or drain body fluids, and plays a very important role in minimally invasive interventional surgery.

[0003] In order to accurately control the bending angle of the distal end of the sheath tube, the adjustable bending sheath tube has gradually attracted much attention. The commonly available adjustable bending sheath tubes on the market usually use a dial or a lever to pull and draw the traction wire, or directly wind the traction wire around a screw, and change the stretching state of the traction wire by rotating the screw, thereby controlling the bending degree of the distal end of the catheter.

[0004] The above structural design and operation method of the adjustable bending sheath tube have the defect of low efficiency in controlling the catheter bending degree. Summary of the Invention

[0005] The purpose of the present invention is to provide a cam adjustable bending sheath tube, which helps to solve the above technical problems.

[0006] The present invention is implemented as follows:

[0007] A cam adjustable bending sheath tube includes a catheter, a traction wire, and a handle assembly. The handle assembly includes a positioning sleeve, a cam, and a sliding member. Two opposite bending adjustment holes are provided on the side wall of the catheter, and the bending adjustment holes extend along the axial direction of the catheter. The positioning sleeve is sleeved outside the catheter. The cam is sleeved outside the positioning sleeve, and the cam can rotate relative to the positioning sleeve around its own axis. The end face of the proximal end of the cam is arranged at an angle with the axis of the cam. The number of the sliding members is two, and the two sliding members are relatively arranged on the side wall of the positioning sleeve. The sliding member can move along the axial direction of the positioning sleeve. The sliding member is movably connected to the end face of the proximal end of the cam. The traction wire is arranged in the bending adjustment hole, and the traction wires in the two bending adjustment holes are respectively connected to the two sliding members. The cam is used to drive the two sliding members to move in opposite directions on the positioning sleeve, and the two sliding members are used to drive the telescoping and release of the two traction wires to bend the distal end of the catheter.

[0008] When rotating the cam of the above-mentioned cam-adjustable bending sheath tube, since the end face of the proximal end of the cam is arranged at an angle with the axis of the cam, it can push two sliding members movably connected to the end face to move. Since the sliding members move along the axis direction of the positioning sleeve and the cam is cylindrical, two opposite positions can be selected on the inclined end face of the cam, so that the two sliding members movably arranged at the corresponding positions at these two places always move in opposite directions during the rotation of the cam. Then, by using the two sliding members to contract and release the traction wire in the bending hole, the bending state of the distal end of the catheter can be quickly controlled.

[0009] Further, a chute is provided on the outer ring surface of the cam and one of the sliding members, and a clamping block is correspondingly provided on the other; the clamping block can move in the chute.

[0010] Further, a guiding groove is provided at the distal end of the sliding member, and the side wall of the cam is located in the guiding groove.

[0011] Further, the bottom plane of the guiding groove is parallel to the end face of the proximal end of the cam.

[0012] Further, a key groove is provided on the outer side of the positioning sleeve, the key groove extends along the axis direction of the positioning sleeve, a convex block is provided at the corresponding position on the sliding member, and the convex block can move in the key groove.

[0013] Further, it further includes a handle knob; the handle knob is sleeved on the outer side of the cam for driving the cam to rotate.

[0014] Further, an annular groove is provided on the inner wall of the handle knob, and a limiting plate is provided in the annular groove; a convex platform is provided on the outer side of the cam, and a limiting groove is opened on the convex platform; the convex platform is located in the annular groove, and the limiting plate is located in the limiting groove.

[0015] Further, it further includes a stress dissipation tube; the stress dissipation tube is in a frustum shape, the diameter of the distal end of the stress dissipation tube is smaller than that of its proximal end; the distal end of the stress dissipation tube is sleeved on the outer side of the catheter, and the proximal end of the stress dissipation tube is fixedly connected to the positioning sleeve.

[0016] Further, it further includes a protective shell; the protective shell is movably sleeved on the outer sides of the cam and the handle knob, and the protective shell is fixedly sleeved on the outer side of the positioning sleeve.

[0017] Further, it further includes a hemostatic valve; the hemostatic valve is provided at the proximal end of the catheter, and the hemostatic valve is communicated with the catheter.

[0018] The beneficial effects of the present invention are:

[0019] The cam-adjustable bending sheath tube of the present invention can drive two sliding members to move in opposite directions by rotating a cylindrical cam, thereby stretching and releasing two traction wires, and thus controlling the bending change of the distal end of the catheter, greatly improving the adjustment efficiency of the catheter bending degree. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 A perspective view of the cam-adjustable bending sheath tube provided by the present invention;

[0022] Figure 2 An axonometric sectional view of the cam-adjustable bending sheath tube provided by the present invention;

[0023] Figure 3 An exploded view of the cam-adjustable bending sheath tube provided by the present invention;

[0024] Figure 4 A front view sectional view of the cam-adjustable bending sheath tube provided by the present invention;

[0025] Figure 5 A sectional view of the catheter in the cam-adjustable bending sheath tube provided by the present invention;

[0026] Figure 6 A perspective view of the sliding member in the cam-adjustable bending sheath tube provided by the present invention;

[0027] Figure 7 A perspective view of the second structure of the cam in the cam-adjustable bending sheath tube provided by the present invention;

[0028] Figure 8 A perspective view of the positioning sleeve and the stress dispersion tube in the cam-adjustable bending sheath tube provided by the present invention.

[0029] Reference numerals: 100 - catheter; 110 - bending adjustment hole; 200 - positioning sleeve; 210 - keyway; 300 - cam; 310 - sliding groove; 320 - boss; 330 - limiting groove; 400 - sliding member; 410 - clamping block; 420 - guiding groove; 430 - convex block; 500 - traction wire; 600 - handle knob; 610 - annular groove; 700 - stress dispersion tube; 800 - protective shell; 900 - hemostatic valve. Detailed Embodiments

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. The components of the embodiments of the present invention usually described and labeled in the accompanying drawings can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0032] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0035] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The following will describe in detail some embodiments of the present invention in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0037] Figure 1 It is a perspective view of the cam 300 adjustable bending sheath tube provided by the present invention; Figure 2 It is an axonometric sectional view of the cam 300 adjustable bending sheath tube provided by the present invention; Figure 3 It is an exploded view of the cam 300 adjustable bending sheath tube provided by the present invention; Figure 4 It is a front sectional view of the cam 300 adjustable bending sheath tube provided by the present invention; Figure 5 It is a sectional view of the catheter 100 in the cam 300 adjustable bending sheath tube provided by the present invention; Figure 6 It is a perspective view of the slider 400 in the cam 300 adjustable bending sheath tube provided by the present invention, Figure 7 It is a perspective view of the second structure of the cam 300 in the cam adjustable bending sheath tube provided by the present invention; Figure 8 It is a perspective view of the positioning sleeve 200 and the stress dispersion tube 700 in the cam adjustable bending sheath tube provided by the present invention. Please refer to Figures 1 to 8 In this embodiment, a cam 300 adjustable bending sheath tube is provided, which includes a catheter 100, a traction wire 500 and a handle assembly. The handle assembly includes a positioning sleeve 200, a cam 300 and a slider 400; two bending adjustment holes 110 are oppositely arranged on the side wall of the catheter 100, and the bending adjustment holes 110 both extend along the axial direction of the catheter 100; the positioning sleeve 200 is sleeved outside the catheter 100; the cam 300 is in a cylindrical shape, the cam 300 is sleeved outside the positioning sleeve 200, and the cam 300 can rotate relative to the positioning sleeve 200 around its own axis, and the end face of the proximal end of the cam 300 is arranged at an angle with the axis of the cam 300; the number of the sliders 400 is two, and the two sliders 400 are oppositely arranged on the side wall of the positioning sleeve 200; the slider 400 can move along the axial direction of the positioning sleeve 200; the slider 400 is movably connected to the end face of the proximal end of the cam 300; the traction wire 500 is arranged in the bending adjustment hole 110, and the traction wires 500 in the two bending adjustment holes 110 are respectively connected to the two sliders 400; by rotating the cam 300, the two sliders 400 can be driven to move in opposite directions on the positioning sleeve 200, and the two sliders 400 can drive the telescoping and release of the two traction wires 500 to bend the distal end of the catheter 100.

[0038] The working principle and operation method of the cam 300 adjustable bending sheath tube in this embodiment are as follows:

[0039] When the above-mentioned cam 300 of the adjustable bending sheath tube rotates the cylindrical cam 300, since the end face of the proximal end of the cam 300 is arranged at an angle with the axis of the cam 300, it can push the two sliding members 400 movably connected to the end face to move. And since the sliding member 400 moves along the axis direction of the positioning sleeve 200 and the cam 300 is cylindrical, two opposite positions can be selected on the inclined end face of the cam 300, so that the two sliding members 400 movably arranged at the two corresponding positions always move in opposite directions during the rotation of the cam 300. Then, by using the two sliding members 400 to contract and release the traction wire 500 in the bending adjustment hole 110, the bending state of the distal end of the catheter 100 can be quickly controlled.

[0040] In the above structure, the catheter 100 is an adjustable bending tube. Among them, the hollow cavity of the catheter 100 is used to establish a channel, transport or retrieve instruments, input drugs or drain body fluids, and a bending adjustment hole 110 is opened on the side wall of the catheter 100, and the bending adjustment hole 110 extends along the axis direction of the catheter 100. In particular, the traction wire 500 extends into the bending adjustment hole 110 from the proximal end of the catheter 100, or a hole is opened in the middle of the catheter 100 to extend into the bending adjustment hole 110, and then the traction wire 500 extends to the distal end of the catheter 100 and is fixed to facilitate the bending control of the distal end of the catheter 100. And a visualization mark should be provided at the distal end of the catheter 100, and during the operation, the position of the catheter 100 can be determined according to the ultrasonic image to assist the medical staff in performing the bending operation.

[0041] In the above structure, the positioning sleeve 200 can be set to be fixedly connected to the catheter 100 to prevent the positioning sleeve 200 from moving relative to the catheter 100 when the traction wire 500 is stretched.

[0042] In the above structure, the cam 300 can be directly sleeved outside the positioning sleeve 200, so that the cam 300 only rotates relative to the positioning sleeve 200. The cam 300 can also be directly in contact with the outer wall of the catheter 100, and a limiting structure is arranged between the two to prevent the cam 300 from axially slipping relative to the catheter 100 and the positioning sleeve 200 along the three.

[0043] In the above structure, on the one hand, the sliding member 400 needs to be movably connected to the inclined end face of the proximal end of the cam 300 and use the inclined end face to drive the movement of the sliding member 400. On the other hand, the movement freedom degree of the sliding member 400 needs to be limited in the axis direction of the positioning sleeve 200.

[0044] In the above structure, one end of the traction wire 500 is fixed on the sliding member 400, and the other end penetrates into the above-mentioned bending adjustment hole 110 and extends to the distal end of the catheter 100.

[0045] On the basis of the above embodiment, optionally, as Figure 3As shown, a chute 310 is provided on the outer ring surface of the cam 300, and a latch 410 is correspondingly provided on the slider 400; when the cam 300 is rotated, the latch 410 moves in the chute 310. Among them, the movement of the latch 410 in the chute 310 realizes the purpose of the cam 300 driving the slider. At this time, the extending direction of the chute 310 should be parallel to the proximal end face of the cam 300, or the plane where the center line of the cavity of the chute 310 is located is parallel to the proximal end face of the cam 300. Optionally, as Figure 7 shown, the latch 410 can also be provided on the outer ring surface of the cam 300 while the chute 310 is provided on the slider 400.

[0046] Based on the above embodiments, optionally, as Figure 6 shown, a guiding groove 420 is provided at the distal end of the slider 400, and the side wall of the cam 300 is located in the guiding groove 420. Among them, the guiding groove 420 should clamp the side wall of the cam 300 and should not affect the interaction of the slider relative to the cam 300. The guiding groove 420 plays a guiding and stabilizing role.

[0047] Based on the above embodiments, optionally, as Figure 6 shown, the bottom plane of the guiding groove 420 is parallel to the proximal end face of the cam 300. Among them, the parallel and fitting state of the above two planes also plays a guiding and stabilizing role.

[0048] Based on the above embodiments, optionally, as Figure 3 、 Figure 8 shown, a keyway 210 is provided on the outer side of the positioning sleeve 200, the keyway 210 extends along the axial direction of the positioning sleeve 200, and a convex block 430 is provided at the corresponding position on the slider 400, and the convex block 430 can move in the keyway 210. Among them, the combination of the keyway 210 and the convex block 430 is aimed at limiting the movement of the slider 400 in the axial direction of the positioning sleeve 200.

[0049] Based on the above embodiments, optionally, as Figures 1 to 4 shown, it further includes a handle knob 600; the handle knob 600 is in a cylindrical shape, the handle knob 600 is sleeved on the outer side of the cam 300 and is used to drive the cam 300 to rotate. Among them, the handle knob 600 should be provided at the distal end of the cam 300, and anti-slip patterns are provided on the outer ring surface of the handle knob 600, which is beneficial for operation and rotation. And for the convenience of installation and disassembly. The handle knob 600 is preferably composed of two semi-cylindrical sleeves combined.

[0050] Based on the above embodiments, optionally, as Figure 3As shown, a ring groove 610 is provided on the inner wall of the handle knob 600, and a limiting plate (not labeled) is provided in the ring groove 610; a boss 320 is provided on the outer side of the cam 300, and a limiting groove 330 is formed on the boss 320; the boss 320 is located in the ring groove 610, and the limiting plate is located in the limiting groove 330. Among them, the ring groove 610 and the boss 320 can facilitate the coaxial installation and sealing of the cam 300 and the handle knob 600. The combination of the limiting plate and the limiting groove 330 makes the cam 300 and the handle knob 600 form a rotating whole, avoiding the sliding of the cam 300 itself.

[0051] Based on the above embodiments, optionally, as Figures 1 to 4 shown, a stress dispersion tube 700 is further included; the stress dispersion tube 700 is in the shape of a frustum of a cone, and the diameter of the distal end of the stress dispersion tube 700 is smaller than that of its proximal end; the distal end of the stress dispersion tube 700 is sleeved on the outer side of the catheter 100, and the proximal end of the stress dispersion tube 700 is fixedly connected to the positioning sleeve 200. Among them, the stress dispersion tube 700 is used to avoid stress concentration caused by the bending of the catheter 100, and the stress dispersion tube 700 can be fixedly connected to the positioning sleeve 200 by means of laser welding, heat sealing, bonding, etc.

[0052] Based on the above embodiments, optionally, as Figures 1 to 4 shown, a protective shell 800 is further included; the protective shell 800 is in a cylindrical shape, the protective shell 800 is movably sleeved on the outer sides of the cam 300 and the handle knob 600, and the protective shell 800 is fixedly sleeved on the outer side of the positioning sleeve 200. Among them, anti-slip patterns should be provided on the outer wall of the protective shell 800 to facilitate the grasping operation. Similarly, the protective shell 800 is preferably composed of two semi-cylindrical sleeves combined together to facilitate installation and disassembly. It should be emphasized that in order to prevent unnecessary relative rotation between the positioning sleeve 200 (and the stress dispersion tube 700) and the protective shell 800, an annular groove and an annular platform for mutual clamping and fixing can be provided between the protective shell 800 and the positioning sleeve 200, so that when the handle knob 600 drives the cam 300 to rotate, the protective shell 800, the positioning sleeve 200 and the stress dispersion tube 700 remain stationary and do not rotate. In addition, a guiding chute should be opened on the inner wall of the protective shell 800 corresponding to the position of the sliding member 400, and the guiding chute is parallel to the key groove 210 on the positioning sleeve 200, which is used to ensure that the sliding member 400 moves along the axis direction of the positioning sleeve 200.

[0053] Optionally, the handle knob 600 can also be clamped to the protective shell 800 through a groove, and a gasket is provided between the handle knob 600 and the protective shell 800 to play a certain role in sealing.

[0054] Based on the above embodiments, optionally, as Figures 1 to 4 shown, it further includes a hemostatic valve 900; the hemostatic valve 900 is arranged at the proximal end of the catheter 100, and the hemostatic valve 900 communicates with the catheter 100. Among them, the hemostatic valve 900 can not only prevent the blood in the blood vessel from overflowing out of the body, reduce blood loss, and lower the difficulty of surgical operation, but also prevent the gas outside the body from entering the blood vessel.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adjustable curved sheath tube with a cam (300), characterized in that, Comprising a catheter (100), a traction wire (500) and a handle assembly, the handle assembly including a positioning sleeve (200), a cam (300) and a sliding member (400); Two opposite bending adjustment holes (110) are provided on the side wall of the catheter (100), and the bending adjustment holes (110) extend along the axial direction of the catheter (100); The positioning sleeve (200) is sleeved outside the catheter (100); The cam (300) is sleeved outside the positioning sleeve (200), and the cam (300) can rotate relative to the positioning sleeve (200) about its own axis, and the end face of the proximal end of the cam (300) is arranged at an angle with the axis of the cam (300); The number of the sliding members (400) is two, and the two sliding members (400) are relatively arranged on the side wall of the positioning sleeve (200); the sliding member (400) can move along the axial direction of the positioning sleeve (200); the sliding member (400) is movably connected to the end face of the proximal end of the cam (300); The traction wire (500) is arranged in the bending adjustment hole (110), and the traction wires (500) in the two bending adjustment holes (110) are respectively connected to the two sliding members (400); The cam (300) is used to drive the two sliding members (400) to move in opposite directions on the positioning sleeve (200), and the two sliding members (400) are used to drive the telescoping and release of the two traction wires (500) to bend the distal end of the catheter (100); A chute (310) is provided on the outer ring surface of the cam (300) and a clamping block (410) is correspondingly provided on one of the sliding members (400); the clamping block (410) can move in the chute (310); A guiding groove (420) is provided at the distal end of the sliding member (400), and the side wall of the cam (300) is located in the guiding groove (420); The bottom plane of the guiding groove (420) is parallel to the end face of the proximal end of the cam (300).

2. The adjustable curved sheath tube of the cam (300) according to claim 1, characterized in that, A key groove (210) is provided on the outside of the positioning sleeve (200), and the key groove (210) extends along the axial direction of the positioning sleeve (200). A convex block (430) is provided at the corresponding position on the sliding member (400), and the convex block (430) can move in the key groove (210).

3. The cam (300) adjustable deflectable sheath tube according to claim 1 or 2, characterized in that, It further includes a handle knob (600); the handle knob (600) is sleeved outside the cam (300) and is used to drive the cam (300) to rotate.

4. The adjustable camber sheath tube of the cam (300) according to claim 3, characterized in that, An annular groove (610) is provided on the inner wall of the handle knob (600), and a limiting plate is arranged in the annular groove (610); a convex platform (320) is provided on the outside of the cam (300), and a limiting groove (330) is opened on the convex platform (320); the convex platform (320) is located in the annular groove (610), and the limiting plate is located in the limiting groove (330).

5. The cam (300) adjustable deflectable sheath tube according to claim 3, characterized in that It further includes a stress dissipation tube (700); the stress dissipation tube (700) is in the shape of a frustum of a cone, and the diameter of the distal end of the stress dissipation tube (700) is smaller than that of its proximal end; The distal end of the stress dissipation tube (700) is sleeved on the outside of the catheter (100), and the proximal end of the stress dissipation tube (700) is fixedly connected to the positioning sleeve (200).

6. The cam (300) adjustable deflectable sheath tube according to claim 3, characterized in that, It further includes a protective shell (800); the protective shell (800) is movably sleeved on the outside of the cam (300) and the handle knob (600), and the protective shell (800) is fixedly sleeved on the outside of the positioning sleeve (200).

7. The adjustable cambered sheath tube of the cam (300) according to claim 6, characterized in that, It further includes a hemostatic valve (900); the hemostatic valve (900) is arranged at the proximal end of the catheter (100), and the hemostatic valve (900) is communicated with the catheter (100).

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