Anti-springback bending-adjustable sheathing canal

Abstract

The invention discloses an anti-springback bending-adjustable sheathing canal which comprises a sheathing canal body and a handle, and the sheathing canal body comprises two pull wires; the handle comprises a shell, two sliding rails fixed in the shell, a fixing tube which is penetrated by the sheathing canal body and fixedly connected with the sheathing canal body, a fixing block connected with the fixing tube, two inserting sleeves fixedly connected with the fixing block, two sliding plates matched with the sliding rails and two adjusting mechanisms. According to the sheathing canal, bidirectional bending adjustment of the sheathing canal can be achieved, and operation is convenient. In the bending adjusting process, the take-up length of the stay wire on the bending adjusting side is smaller than the pay-off length of the stay wire on the other side, and therefore the actual pay-off and take-up requirements of the stay wires on the two sides during bending adjusting of the bending adjusting section of the sheathing canal body are better met. After bending adjustment is completed, the stay wires on the two sides can be automatically locked, and therefore springback of the bending adjustment section of the sheathing canal is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of sheath tubes, and more specifically, to an anti-rebound adjustable bending sheath tube. Background Art

[0002] Sheath tubes are common means in modern medical interventional treatments and play an important role in fields such as coronary angiography and ablation. The structure of a sheath tube generally includes a handle and a sheath tube body. The sheath tube body includes an inner protective layer, a metal braided layer, and an outer protective layer from the inside to the outside. And there is a pull wire between the outer protective layer and the metal braided layer, so that the bending section of the sheath tube body can be bent. There is an adjustment mechanism at the handle for operating the take-up and pay-out of the pull wire.

[0003] However, in the actual bending process of the sheath tube, when the bending section is bent (for example, bent into an L shape or a U shape), for the bent part of the sheath tube, the inner pull wire needs to be taken up, and the outer pull wire needs to be payed out. However, since the inner pull wire is located inside the bent part of the sheath tube and the outer pull wire is located outside the bent part of the sheath tube, the length of the inner take-up is shorter than the length of the outer pay-out. However, in the existing adjustment mechanisms, the length of the inner take-up and the length of the outer pay-out are often the same, resulting in the inability to match the actual working states of the two-sided pull wires when the sheath tube is actually bent. In addition, after the sheath tube is bent, it faces a resilience force. Some sheath tubes need to be manually locked after being bent, which sometimes causes the bending section to rebound, resulting in damage to blood vessels. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art and provide an anti-rebound adjustable bending sheath tube.

[0005] To achieve the above object, the present invention provides the following technical solution: A sheath tube, comprising a sheath tube body and a handle. The sheath tube body includes two wire ropes; the handle includes a housing, two slide rails fixed within the housing, a fixed tube penetrated by the sheath tube body and fixedly connected to the sheath tube body, a fixed block connected to the fixed tube, two socket sleeves fixedly connected to the fixed block, two sliding plates cooperating with the slide rails, and two adjusting mechanisms; A first connecting rod is connected between each slide rail and the fixed tube; A first rack and a second rack are fixed at the sliding plate; Two anchor units are fixed at the sliding plate, and the two wire ropes are respectively fixedly connected to the two anchor units; The sliding plate has a first strip-shaped through slot; The adjusting mechanism includes a fixing unit and a rotating unit. The fixing unit includes a fixing ring having a plurality of limit jacks and a second connecting rod connecting the fixing ring and the housing and passing through the first strip-shaped through slot. The rotating unit includes a knob, a rotating shaft fixed to the knob, a first gear fixed to the rotating shaft, a second gear fixed to the rotating shaft, a locking gear fixed to the rotating shaft, and a plurality of limit inserting rods fixedly connected to the locking gear and cooperating with the limit jacks. The end of the rotating shaft has a groove portion, and an inserting block capable of rotating relative to the rotating shaft is installed in the groove portion. A spring surrounded by the socket sleeve is connected between the inserting block and the fixed block. A connecting bearing is installed at the rotating shaft, and a connecting cylinder is connected between the connecting bearings of the two adjusting mechanisms. The connecting cylinder has a second strip-shaped through slot penetrated by the fixed block; A first rack capable of cooperating with the first gear, a second rack capable of cooperating with the second gear, and two locking racks capable of cooperating with the locking gear are fixed at the sliding plate.

[0006] Further, each sliding plate has two first strip-shaped through slots.

[0007] Further, two second connecting rods are connected to each fixing ring.

[0008] Further, the anchor unit is a cylindrical block having a wire rope through hole, and the wire rope passes through the wire rope through hole and is fixedly connected to the wire rope through hole.

[0009] Further, the sheath tube body has a plurality of imaging rings.

[0010] Further, the connecting cylinder has two second strip-shaped through slots.

[0011] Further, each sliding plate has a first rack, a second rack, and two locking racks.

[0012] Further, the fixed tube has two third strip-shaped through slots, and the two wire ropes respectively pass through the two third strip-shaped through slots.

[0013] Thus, the wire rope passes through from the third strip-shaped through slot, so that the proximal end of the wire rope is fixedly connected to the anchor unit. Thus, as the sliding plate translates, the wire rope can be pulled backward or forward.

[0014] Furthermore, two second connecting rods are fixedly connected to each fixing ring.

[0015] Furthermore, the groove part is cylindrical.

[0016] Furthermore, the insertion block is cylindrical.

[0017] Furthermore, the top and bottom of the teeth of the locking gear have chamfers.

[0018] Thus, when the locking gear resumes meshing with the locking rack, the teeth of the locking gear are more likely to be inserted between the teeth of the locking rack.

[0019] Furthermore, a hemostatic valve is also included.

[0020] Furthermore, the housing includes a rear end tail cover, a circular cylindrical shell, and a front end conical shell.

[0021] Furthermore, a rotating plate is also fixed at the rotating shaft, and the knob, rotating plate, first gear, second gear, and locking gear of the adjusting mechanism are distributed in sequence.

[0022] Furthermore, the radius of the locking gear is greater than the radius of the second gear, and the number of teeth of the locking gear is greater than or equal to 2 times the number of teeth of the second gear.

[0023] Thus, the teeth of the locking gear are smaller, and the adjacent spacing of the teeth of the locking rack is smaller. Thus, when the knob is reset, the locking gear and the locking rack are more likely to mesh, so as to achieve better meshing and locking of the two sliding plates.

[0024] Furthermore, there are two through holes on the housing that are penetrated by the rotating shaft. There are a plurality of positioning grooves distributed at equal intervals in a ring at the through holes, and there are a plurality of elastic positioning protrusions distributed at equal intervals in a ring on the rotating shaft that cooperate with the positioning grooves.

[0025] Thus, the cooperation of the elastic positioning protrusions and the positioning grooves makes the rotation of the rotating shaft have a certain damping effect, and makes the rotation of the rotating shaft rotate in one grid by one grid, so that the meshing of the gear and the rack is more stable.

[0026] Furthermore, the number of positioning grooves of the through hole is equal to the number of elastic positioning protrusions of the rotating shaft.

[0027] Furthermore, the elastic positioning protrusion is semi-cylindrical and made of rubber.

[0028] Furthermore, the plurality of limit jacks at the fixing ring are distributed at equal intervals in a ring, and the plurality of limit insertion rods at the locking gear are distributed at equal intervals in a ring.

[0029] Further, the number of the limit jacks of the fixed ring, the number of the limit insertion rods at the locking gear, the number of the teeth of the second gear, the number of the teeth of the first gear, the number of the positioning grooves at the perforation, and the number of the elastic positioning protrusions at the rotating shaft are all equal.

[0030] Thus, the knob can be rotated one grid by one grid, and when it rotates one grid, the first gear and the second gear also rotate one grid, thus facilitating the positioning and meshing of the gear and the rack.

[0031] Further, the radius of the first gear is smaller than the radius of the second gear.

[0032] Further, the distance between two adjacent teeth of the first rack is smaller than the distance between two adjacent teeth of the second rack.

[0033] Further, the distance between two adjacent teeth of the first rack is D1, and the distance between two adjacent teeth of the second rack is D2; D2 is greater than or equal to 1.01 times of D1 and less than or equal to 1.5 times of D1.

[0034] Preferably, D2 is greater than or equal to 1.05 times of D1 and less than or equal to 1.2 times of D1.

[0035] Further, the number of the limit insertion rods of the locking gear is between 16 and 28.

[0036] Further, the two skateboards are respectively a first skateboard and a second skateboard, and the two adjusting mechanisms are respectively a first adjusting mechanism and a second adjusting mechanism; the handle can be in a first adjusting state, a second adjusting state and a locking state. In the first adjusting state, the first gear of the first adjusting mechanism meshes with the first rack at the first skateboard, the second gear of the first adjusting mechanism meshes with the second rack at the second skateboard, the first gear of the second adjusting mechanism does not mesh with the first rack at the second skateboard, the second gear of the second adjusting mechanism does not mesh with the second rack at the first skateboard, all the locking gears do not mesh with the corresponding locking racks, each limiting plug of the first adjusting mechanism does not insert into the limiting jack, and each limiting plug of the second adjusting mechanism inserts into the limiting jack. In the second adjusting state, the first gear of the second adjusting mechanism meshes with the first rack at the second skateboard, the second gear of the second adjusting mechanism meshes with the second rack at the first skateboard, the first gear of the first adjusting mechanism does not mesh with the first rack at the first skateboard, the second gear of the first adjusting mechanism does not mesh with the second rack at the second skateboard, all the locking gears do not mesh with the corresponding locking racks, each limiting plug of the second adjusting mechanism does not insert into the limiting jack, and each limiting plug of the first adjusting mechanism inserts into the limiting jack. In the locking state, the first gear of the first adjusting mechanism does not mesh with the first rack at the first skateboard, the second gear of the first adjusting mechanism does not mesh with the second rack at the second skateboard, the first gear of the second adjusting mechanism does not mesh with the first rack at the second skateboard, the second gear of the second adjusting mechanism does not mesh with the second rack at the first skateboard, all the locking gears mesh with the corresponding locking racks, each limiting plug of the first adjusting mechanism inserts into a limiting jack, and each limiting plug of the second adjusting mechanism inserts into a limiting jack.

[0037] Further, the knob has an arrow indication mark.

[0038] In some embodiments, both knobs of the two adjusting mechanisms have first mounting grooves, and both circular flanges have second mounting grooves. An indicator unit and a control unit are installed on the housing; a light emitter is installed in the first mounting groove, and a light receiver is installed in the second mounting groove. When neither of the two light receivers receives the optical signal from the light emitter, the control unit controls the indicator unit to light up.

[0039] Further, the groove part of the rotating shaft has an annular sliding groove, and the inserting block has a rotating block that cooperates with the annular sliding groove.

[0040] In some embodiments, the inserting block and the groove part are connected by a bearing.

[0041] Further, the sheath body includes an inner layer, an outer layer, a metal braided layer and a pull ring, and both stay wires are fixedly connected to the pull ring.

[0042] Further, the sheath tube is divided into a bending adjustment section and a pushing section, and the pull ring is located in the bending adjustment section.

[0043] Further, the metal braided layer is located between the inner layer and the outer layer.

[0044] Further, there are two circular flanges at the housing.

[0045] Further, there are two inner convex blocks with limiting planes at the housing, the perforation penetrates through the inner convex blocks, in the first adjustment state, the length of the gap between the rotating plate of the first adjustment mechanism and the limiting plane of the corresponding inner convex block along the axis of the rotating shaft is less than 1 mm; in the second adjustment state, the length of the gap between the rotating plate of the second adjustment mechanism and the limiting plane of the corresponding inner convex block along the axis of the rotating shaft is less than 1 mm.

[0046] Thus, the inner convex block and the rotating plate can achieve good limiting, so that when the knob is pulled, the pulling amplitude is limited.

[0047] Beneficial effects:

[0048] 1. The sheath tube of the present application can achieve two-way bending adjustment of the sheath tube and is convenient to operate.

[0049] 2. During the bending adjustment process of the sheath tube of the present application, the length of the wire winding on the bending adjustment side of the wire is less than the length of the wire unwinding on the other side, so as to better meet the actual requirements of wire unwinding and winding on both sides of the bending adjustment section of the sheath tube body during bending adjustment.

[0050] 3. After the bending adjustment of the sheath tube of the present application is completed, it can automatically lock the wires on both sides, thus avoiding the rebound of the bending adjustment section of the sheath tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a schematic diagram of the sheath tube; Figure 2 is a schematic cross-sectional view of the handle; Figure 3 is an enlarged view of area A; Figure 4 is an enlarged view of area B; Figure 5 is a schematic diagram of the inside of the handle with a part of the housing cut away; Figure 6 is an enlarged view of area C; Figure 7 is a schematic diagram of the handle in the initial state; Figure 8 is an enlarged view of area D; Figure 9 is an enlarged view of area E; Figure 10 Schematic diagram of pulling the knob of the first adjusting mechanism away from the housing Figure 11 Enlarged view of area F Figure 12 Enlarged view of area G Figure 13 Enlarged view of area H Figure 14 Schematic diagram of adjusting using the first adjusting mechanism Figure 15 Enlarged view of area I Figure 16 Schematic diagram of locking the two sliding plates by the two adjusting mechanisms after the first adjusting mechanism is adjusted Figure 17 Enlarged view of area J Figure 18 Schematic diagram of the handle in Embodiment 2

[0052] For clear illustration Figures 7 - 16 The two adjusting mechanisms, the connecting cylinder and the housing are separated and shown

[0053] Explanation of reference numerals: Sheath tube body 1; Pull wire 1.1; Housing 2; Slide rail 2.1; Positioning groove 2.2; Annular flange 2.3; Second installation groove 2.3.1; Inner projection 2.4; Indicator light unit 2.5; Control unit 2.6; Fixed tube 3; Fixed block 3.1; Socket 3.2; First connecting rod 3.3; Spring 3.4; Third strip-shaped through groove 3.5; Slide plate 4; First rack 4.1; Second rack 4.2; Anchor unit 4.3; First strip-shaped through groove 4.4; Locking rack 4.5; First slide plate 4.6; Second slide plate 4.7; Fixed ring 5; Limit jack 5.1; Second connecting rod 5.2; Knob 6; Rotating shaft 6.1; Groove part 6.1.1; Elastic positioning projection 6.1.2; First gear 6.2; Second gear 6.3; Locking gear 6.4; Limit insertion rod 6.5; Insert block 6.6; Rotating block 6.6.1; Rotating plate 6.7; Arrow indication mark 6.8; First installation groove 6.9; Connecting cylinder 7; Second strip-shaped through groove 7.1 Detailed description of the specific implementation mode

[0054] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention

[0055] Embodiment 1:

[0056] Embodiment 1 discloses an anti-rebound adjustable bending sheath tube, including a sheath tube body 1 and a handle. The sheath tube body 1 includes two guy wires 1.1. The handle includes a housing 2, two slide rails 2.1 fixed inside the housing 2, a fixed tube 3 penetrated by the sheath tube body 1 and fixedly connected to the sheath tube body 1, a fixed block 3.1 connected to the fixed tube 3, two socket sleeves 3.2 fixedly connected to the fixed block 3.1, two sliding plates 4 cooperating with the slide rails 2.1, and two adjusting mechanisms. A first connecting rod 3.3 is connected between each slide rail 2.1 and the fixed tube 3. A first rack 4.1 and a second rack 4.2 are fixed at the sliding plate 4. Two anchor point units 4.3 are fixed at the sliding plate 4, and the two guy wires 1.1 are respectively fixedly connected to the two anchor point units 4.3. The sliding plate 4 has a first strip-shaped through groove 4.4. The adjusting mechanism includes a fixing unit and a rotating unit. The fixing unit includes a fixing ring 5 having a plurality of limit insertion holes 5.1 and a second connecting rod 5.2 connecting the fixing ring 5 and the housing 2 and passing through the first strip-shaped through groove 4.4. The rotating unit includes a knob 6, a rotating shaft 6.1 fixed to the knob 6, a first gear 6.2 fixed to the rotating shaft 6.1, a second gear 6.3 fixed to the rotating shaft 6.1, a locking gear 6.4 fixed to the rotating shaft 6.1, and a plurality of limit insertion rods 6.5 fixed to the locking gear 6.4 and cooperating with the limit insertion holes 5.1. The end of the rotating shaft 6.1 has a groove portion 6.1.1, and an insertion block 6.6 capable of rotating relative to the rotating shaft 6.1 is installed in the groove portion 6.1.1. A spring 3.4 surrounded by the socket sleeve 3.2 is connected between the insertion block 6.6 and the fixed block 3.1. A connecting bearing is installed at the rotating shaft 6.1, and a connecting cylinder 7 is connected between the connecting bearings of the two adjusting mechanisms. The connecting cylinder 7 has a second strip-shaped through groove 7.1 penetrated by the fixed block 3.1. A first rack 4.1 capable of cooperating with the first gear 6.2, a second rack 4.2 capable of cooperating with the second gear 6.3, and two locking racks 4.5 capable of cooperating with the locking gear 6.4 are fixed at the sliding plate 4.

[0057] A rotating plate 6.7 is also fixed at the rotating shaft 6.1, and the knob 6, the rotating plate 6.7, the first gear 6.2, the second gear 6.3 and the locking gear 6.4 of the adjusting mechanism are distributed in sequence; the radius of the locking gear 6.4 is greater than the radius of the second gear 6.3, and the number of teeth of the locking gear 6.4 is greater than or equal to twice the number of teeth of the second gear 6.3. The housing 2 has two through holes penetrated by the rotating shaft 6.1, and a plurality of positioning grooves 2.2 are arranged at equal intervals in a ring at the through holes. A plurality of elastic positioning protrusions 6.1.2 that cooperate with the positioning grooves 2.2 are arranged at equal intervals in a ring at the rotating shaft 6.1. A plurality of limit jacks 5.1 at the fixing ring 5 are arranged at equal intervals in a ring, and a plurality of limit insertion rods 6.5 at the locking gear 6.4 are arranged at equal intervals in a ring; the number of the limit jacks 5.1 at the fixing ring 5, the number of the limit insertion rods 6.5 at the locking gear 6.4, the number of teeth of the second gear 6.3, the number of teeth of the first gear 6.2, the number of the positioning grooves 2.2 at the through holes and the number of the elastic positioning protrusions 6.1.2 at the rotating shaft 6.1 are all equal. The radius of the first gear 6.2 is smaller than the radius of the second gear 6.3; the distance between two adjacent teeth of the first rack 4.1 is smaller than the distance between two adjacent teeth of the second rack 4.2.

[0058] The number of the limit insertion rods 6.5 of the locking gear 6.4 is between 16 and 28; the two sliding plates 4 are respectively a first sliding plate 4.6 and a second sliding plate 4.7, and the two adjusting mechanisms are respectively a first adjusting mechanism and a second adjusting mechanism; the handle can be in a first adjusting state, a second adjusting state and a locking state. In the first adjusting state, the first gear 6.2 of the first adjusting mechanism meshes with the first rack 4.1 at the first sliding plate, the second gear 6.3 of the first adjusting mechanism meshes with the second rack 4.2 at the second sliding plate, the first gear 6.2 of the second adjusting mechanism does not mesh with the first rack 4.1 at the second sliding plate, the second gear 6.3 of the second adjusting mechanism does not mesh with the second rack 4.2 at the first sliding plate, all the locking gears 6.4 do not mesh with the corresponding locking racks 4.5, each limit insertion rod 6.5 of the first adjusting mechanism is not inserted into the limit insertion hole 5.1, and each limit insertion rod 6.5 of the second adjusting mechanism is inserted into the limit insertion hole 5.1; in the second adjusting state, the first gear 6.2 of the second adjusting mechanism meshes with the first rack 4.1 at the second sliding plate, the second gear 6.3 of the second adjusting mechanism meshes with the second rack 4.2 at the first sliding plate, the first gear 6.2 of the first adjusting mechanism does not mesh with the first rack 4.1 at the first sliding plate, the second gear 6.3 of the first adjusting mechanism does not mesh with the second rack 4.2 at the second sliding plate, all the locking gears 6.4 do not mesh with the corresponding locking racks 4.5, each limit insertion rod 6.5 of the second adjusting mechanism is not inserted into the limit insertion hole, and each limit insertion rod 6.5 of the first adjusting mechanism is inserted into the limit insertion hole; in the locking state, the first gear 6.2 of the first adjusting mechanism does not mesh with the first rack 4.1 at the first sliding plate, the second gear 6.3 of the first adjusting mechanism does not mesh with the second rack 4.2 at the second sliding plate, the first gear 6.2 of the second adjusting mechanism does not mesh with the first rack 4.1 at the second sliding plate, the second gear 6.3 of the second adjusting mechanism does not mesh with the second rack 4.2 at the first sliding plate, all the locking gears 6.4 mesh with the corresponding locking racks 4.5, each limit insertion rod 6.5 of the first adjusting mechanism is inserted into a limit insertion hole 5.1, and each limit insertion rod 6.5 of the second adjusting mechanism is inserted into a limit insertion hole 5.1.

[0059] The housing 2 has two annular flanges 2.3; the knob 6 has an arrow indication mark 6.8. The groove portion 6.1.1 of the rotating shaft 6.1 has an annular sliding groove, and the insertion block 6.6 has a rotating block 6.6.1 that cooperates with the annular sliding groove. The sheath tube body 1 includes an inner layer, an outer layer, a metal braided layer, and a pull ring. Both pull wires 1.1 are fixedly connected to the pull ring; the sheath tube is divided into a bending adjustment section and a pushing section, and the pull ring is located in the bending adjustment section. The housing 2 has two inner convex blocks 2.4 with limiting planes, and the perforation penetrates through the inner convex blocks 2.4. In the first adjustment state, the gap between the rotating plate 6.7 of the first adjustment mechanism and the limiting plane of the corresponding inner convex block 2.4 along the axis of the rotating shaft 6.1 is less than 1 mm; in the second adjustment state, the gap between the rotating plate 6.7 of the second adjustment mechanism and the limiting plane of the corresponding inner convex block 2.4 along the axis of the rotating shaft 6.1 is less than 1 mm.

[0060] Working principle: The adjustable bending sheath tube of the present application has two pull wires, and the proximal ends of the pull wires are fixedly connected to the anchor units at the two sliding plates. When no bending adjustment operation is performed, due to the reset action of the two springs, the two adjustment mechanisms and the connecting cylinder form an integral body (for the convenience of description, hereinafter referred to as the adjustment mechanism integral body), which is in the middle position. Thus, the locking gears of each adjustment mechanism are engaged with the locking racks at the two sliding plates, so as to lock the positions of the two sliding plates, and thus the positions of the pull wires are stable.

[0061] When it is necessary to bend the sheath tube to one side, for example, when it is necessary to bend the sheath tube to the side corresponding to the first sliding plate, the knob of the first adjustment mechanism is pulled away from the housing, so that as Figure 14 shown, the first gear of the first adjustment mechanism is engaged with the first rack at the first sliding plate, the second gear of the first adjustment mechanism is engaged with the second rack at the second sliding plate, and the limiting insertion rod of the first adjustment mechanism is disengaged from the limiting insertion hole, and all the locking gears and the locking racks are not engaged. And when the knob is rotated, the first sliding plate moves backward, so that the pull wire connected to the first sliding plate moves backward, the pull wire connected to the second sliding plate moves forward, and the length of the pull wire at the first sliding plate moving backward is less than the length of the pull wire connected to the second sliding plate moving forward. Thus, it more conforms to the displacement conditions required by the pull wires on both sides of the bending adjustment section during bending.

[0062] And after the bending adjustment is completed, by releasing the first adjustment mechanism, so as Figure 16As shown, the locking gear resumes meshing with the locking rack, so that the positions of both sliding plates are locked, and thus the sheath tube maintains the bent state and will not rebound. When the sheath tube needs to be restored to a straight state, the knob of the first adjustment mechanism can be pulled up and rotated again to make both sliding plates return to the initial state. When the sheath tube needs to be bent to the other side, in the initial state, by operating the knob of the second adjustment mechanism in a similar manner, the sheath tube can be bent to the other side. For the sheath tube of the present application, during operation, after one adjustment mechanism is operated to bend the sheath tube, it is necessary to use this adjustment mechanism to restore the sheath tube to the initial state before the other adjustment mechanism can be used to bend the sheath tube. The arrow indication mark at the knob can remind the operator of the position of the knob to avoid misoperation (specifically, when operating the knob of one adjustment mechanism, it is necessary to ensure that the knob of the other adjustment mechanism is in the initial state).

[0063] Embodiment 2:

[0064] The difference between Embodiment 2 and Embodiment 1 is that both the knobs 6 of the two adjustment mechanisms are provided with first mounting grooves 6.9, and both the annular flanges 2.3 are provided with second mounting grooves 2.3.1. An indicator unit 2.5 and a control unit 2.6 are installed on the housing 2; a light emitter is installed in the first mounting groove 6.9, and a light receiver is installed in the second mounting groove 2.3.1. When neither of the two light receivers receives the light signal from the light emitter, the control unit 2.6 controls the indicator unit 2.5 to light up.

[0065] Therefore, it is necessary to ensure that the knob of one adjustment mechanism is in the initial state before the knob of the other adjustment mechanism can be operated. When the knob of one adjustment mechanism has not been reset and the knob of the other adjustment mechanism is rotated, both knobs will be rotated, so that neither of the two light receivers can receive the light signal from the light emitter, and thus the indicator unit lights up to remind the operator that a misoperation has occurred and to correct it in time.

[0066] Although the present invention has been illustrated and described with respect to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention as long as they do not exceed the scope defined by the claims of the present invention.

Claims

1. An anti-rebound adjustable bending sheath tube, characterized in that, Comprising a sheath body and a handle, the sheath body includes two wire ropes; the handle includes a housing, two slide rails fixed within the housing, a fixed tube through which the sheath body passes and is fixedly connected to the sheath body, a fixed block connected to the fixed tube, two socket sleeves fixedly connected to the fixed block, two sliding plates cooperating with the slide rails, and two adjusting mechanisms; a first connecting rod is connected between each slide rail and the fixed tube; a first rack and a second rack are fixed at the sliding plate; two anchor units are fixed at the sliding plate, and the two wire ropes are respectively fixedly connected to the two anchor units; the sliding plate has a first strip-shaped through groove; the adjusting mechanism includes a fixing unit and a rotating unit, the fixing unit includes a fixing ring having a plurality of limit jacks and a second connecting rod connecting the fixing ring and the housing and passing through the first strip-shaped through groove, the rotating unit includes a knob, a rotating shaft fixed to the knob, a first gear fixed to the rotating shaft, a second gear fixed to the rotating shaft, a locking gear fixed to the rotating shaft, and a plurality of limit inserting rods fixedly connected to the locking gear and cooperating with the limit jacks, the end of the rotating shaft has a groove portion, and an inserting block capable of rotating relative to the rotating shaft is installed within the groove portion, a spring surrounded by the socket sleeve is connected between the inserting block and the fixed block, a connecting bearing is installed at the rotating shaft, a connecting cylinder is connected between the connecting bearings of the two adjusting mechanisms, and the connecting cylinder has a second strip-shaped through groove through which the fixed block passes; a first rack capable of cooperating with the first gear, a second rack capable of cooperating with the second gear, and two locking racks capable of cooperating with the locking gear are fixed at the sliding plate.

2. The anti-rebound adjustable bending sheath tube according to claim 1, wherein A rotating plate is further fixed at the rotating shaft, and the knob, the rotating plate, the first gear, the second gear, and the locking gear of the adjusting mechanism are arranged in sequence; the radius of the locking gear is greater than the radius of the second gear, and the number of teeth at the locking gear is greater than or equal to twice the number of teeth at the second gear.

3. The anti-rebound adjustable curved sheath tube according to claim 1, characterized in that, The housing has two through holes through which the rotating shaft passes, and a plurality of positioning grooves are arranged at equal intervals in a ring shape at the through holes, and a plurality of elastic positioning protrusions cooperating with the positioning grooves are arranged at equal intervals in a ring shape at the rotating shaft.

4. The anti-rebound adjustable bending sheath tube according to claim 1, wherein The plurality of limit jacks at the fixing ring are arranged at equal intervals in a ring shape, and the plurality of limit inserting rods at the locking gear are arranged at equal intervals in a ring shape; the number of limit jacks at the fixing ring, the number of limit inserting rods at the locking gear, the number of teeth of the second gear, the number of teeth of the first gear, the number of positioning grooves at the through holes, and the number of elastic positioning protrusions at the rotating shaft are all equal.

5. The anti-rebound adjustable bending sheath tube according to claim 1, wherein, The radius of the first gear is smaller than the radius of the second gear; the distance between two adjacent teeth of the first rack is smaller than the distance between two adjacent teeth of the second rack.

6. The anti-rebound adjustable bending sheath tube according to claim 2, characterized in that, The number of the limiting insertion rods of the locking gear is between 16 and 28; the two sliding plates are respectively a first sliding plate and a second sliding plate, and the two adjusting mechanisms are respectively a first adjusting mechanism and a second adjusting mechanism; the handle can be in a first adjusting state, a second adjusting state and a locking state. In the first adjusting state, the first gear of the first adjusting mechanism meshes with the first rack at the first sliding plate, the second gear of the first adjusting mechanism meshes with the second rack at the second sliding plate, the first gear of the second adjusting mechanism does not mesh with the first rack at the second sliding plate, the second gear of the second adjusting mechanism does not mesh with the second rack at the first sliding plate, all the locking gears do not mesh with the corresponding locking racks, each limiting insertion rod of the first adjusting mechanism does not insert into the limiting jack, and each limiting insertion rod of the second adjusting mechanism inserts into the limiting jack; in the second adjusting state, the first gear of the second adjusting mechanism meshes with the first rack at the second sliding plate, the second gear of the second adjusting mechanism meshes with the second rack at the first sliding plate, the first gear of the first adjusting mechanism does not mesh with the first rack at the first sliding plate, the second gear of the first adjusting mechanism does not mesh with the second rack at the second sliding plate, all the locking gears do not mesh with the corresponding locking racks, each limiting insertion rod of the second adjusting mechanism does not insert into the limiting jack, and each limiting insertion rod of the first adjusting mechanism inserts into the limiting jack; in the locking state, the first gear of the first adjusting mechanism does not mesh with the first rack at the first sliding plate, the second gear of the first adjusting mechanism does not mesh with the second rack at the second sliding plate, the first gear of the second adjusting mechanism does not mesh with the first rack at the second sliding plate, the second gear of the second adjusting mechanism does not mesh with the second rack at the first sliding plate, all the locking gears mesh with the corresponding locking racks, each limiting insertion rod of the first adjusting mechanism inserts into a limiting jack, and each limiting insertion rod of the second adjusting mechanism inserts into a limiting jack.

7. The anti-rebound adjustable bending sheath tube according to claim 1, wherein Two annular flanges are provided at the housing; an arrow indicating mark is provided at the knob.

8. The anti-rebound adjustable bending sheath tube according to claim 6, wherein An annular sliding groove is provided at the groove part of the rotating shaft, and a rotating block matching with the annular sliding groove is provided at the inserting block.

9. The anti-rebound adjustable bending sheath tube according to claim 1, characterized in that The sheath body includes an inner layer, an outer layer, a metal braided layer and a pull ring, and both wire ropes are fixedly connected with the pull ring; the sheath is divided into a bending adjustment section and a pushing section, and the pull ring is located at the bending adjustment section.

10. The anti-rebound adjustable bending sheath tube according to claim 1, wherein Two inner convex blocks with limiting planes are provided at the housing, the perforation penetrates through the inner convex blocks, and in the first adjusting state, the length of the gap between the rotating plate of the first adjusting mechanism and the limiting plane of the corresponding inner convex block along the axis of the rotating shaft is less than 1 mm; in the second adjusting state, the length of the gap between the rotating plate of the second adjusting mechanism and the limiting plane of the corresponding inner convex block along the axis of the rotating shaft is less than 1 mm.

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