CN214209122U - Distal end adjustable bent sheath tube - Google Patents

Abstract

The utility model discloses an adjustable curved sheath pipe of distal end, include: a body comprising a distal end and a proximal end, the distal end being compliant; a first pull wire having one end connected to the distal end; the first sliding piece is connected with the other end of the first traction wire; the rotating piece is in transmission connection with the first sliding piece and controls the first traction wire to be tightened and loosened through the first sliding piece; the far end is bent under the tension of the first traction wire, the bending of the far end tube body is adjustable, the sheath tube can accurately reach the required position, the operation process is convenient and fast, and the treatment effect and the operation success rate are improved.

Description

Distal end adjustable bent sheath tube

Technical Field

The utility model relates to an implantability medical instrument field, in particular to adjustable curved sheath pipe of distal end.

Background

Interventional therapy is minimally invasive therapy which is carried out by utilizing modern high-tech means, under the guidance of medical imaging equipment, special precise medical instruments such as catheters, guide wires and the like are introduced into a human body and are used for establishing a passage, conveying instruments or medicines and the like, in the design and manufacture of the existing catheters, the far ends of the catheters are mostly molded into different curved shapes to meet different blood vessel anatomical structures, so that the catheters can conveniently pass through and reach lesion positions, but the pre-molded curved shapes are deformed after entering blood vessels and are not the shapes required by operators, and further cannot accurately reach target positions, so that the clinical requirements cannot be met, in order to solve the problems that the shapes of multiple shapes are difficult to select and the shapes are deformed after entering the blood vessels, the catheters are designed into bidirectional adjustable curves to meet the requirements of clinical different anatomical structures, so that the bending angles can be more accurately controlled to realize more accurate lesion positions reaching, thereby reducing the operation time and the occurrence of complications of the patient.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an adjustable curved sheath pipe of distal end can realize that the distal end sheath pipe is crooked adjustable, improves treatment and operation success rate.

According to the utility model discloses an adjustable curved sheath pipe of distal end, include: a body comprising a distal end and a proximal end, the distal end being compliant; a first pull wire having one end connected to the distal end; the first sliding piece is connected with the other end of the first traction wire; and the rotating part is in transmission connection with the first sliding part and controls the first traction wire to be tightened and loosened through the first sliding part.

According to the utility model discloses a crooked sheath pipe of distal end adjustable has following beneficial effect at least: the body has distal end and near-end, the distal end can be crooked and have the compliance, the one end of first traction wire and the distal end fixed connection of body, the other end fixed connection of first slider and first traction wire, it is connected with the transmission of first slider to rotate the piece, it is rotatory to rotate the piece, drive tightening up and relaxing of first traction wire of first slider control, make the distal end crooked, can reach the crooked angular position of needs, it is crooked adjustable to realize the distal end body, make operation process convenient and fast, treatment and operation success rate are improved.

According to some embodiments of the invention, the second slider is in driving connection with the rotating member; one end of the second traction wire is connected with the far end, and the other end of the second traction wire is connected with the second sliding piece; the rotating piece drives the first sliding piece and the second sliding piece to move in the opposite direction, and therefore the first traction wire and the second traction wire are controlled to be tightened and loosened.

According to the utility model discloses a some embodiments still include the casing, the left side of casing is provided with the fixed axle, the right side of casing is worn to be equipped with the rotation knob, it establishes to rotate the piece cover on the fixed axle, it is suitable for the drive to rotate the knob rotate the piece edge the fixed axle rotates.

According to some embodiments of the utility model, the upper and lower side of casing is provided with the spacing groove, first slider with the second slider slides and sets up the spacing inslot.

According to some embodiments of the present invention, the first slider and the second slider are provided with a rack on the side opposite to each other, and the rotating member is of a gear structure that matches the rack.

According to some embodiments of the utility model, still include stress dissipation pipe, stress dissipation pipe sets up the body with the casing junction.

According to some embodiments of the present invention, the tube body has a hollow cavity, and the hollow cavity includes an inner layer, an intermediate layer and an outer layer from inside to outside in sequence.

According to the utility model discloses a some embodiments, the body has the seal wire chamber, the seal wire chamber can set up the arbitrary one deck of body, or set up between adjacent two-layer, just the seal wire chamber can set up to single chamber or two-chamber, first traction wire with the second traction wire can be provided with one in the single chamber, or be provided with two in the two-chamber.

According to some embodiments of the invention, the first traction wire and the second traction wire are tungsten wires, nickel titanium wires or stainless steel wires.

According to some embodiments of the utility model, the body still includes the development mark, the development mark sets up the crooked section of distal end.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Additional aspects and advantages of the present invention will become apparent from and will be readily appreciated by reference to the following description of the embodiments taken in conjunction with the accompanying drawings,

wherein:

fig. 1 is a schematic structural view of a distal end adjustable curved sheath according to some embodiments of the present invention;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1;

fig. 3 is a schematic view illustrating a bent structure of a distal end adjustable sheath according to some embodiments of the present invention;

FIG. 4 is a cross-sectional view of a catheter body with a single lumen for the guidewire lumen of the distal adjustable curved sheath;

FIG. 5 is a cross-sectional view of a catheter body with a double lumen guidewire lumen of a distal adjustable curved sheath;

FIG. 6 is a partial enlarged view of the distal end of the tube body with a snap ring added thereto;

FIG. 7 is an enlarged view of a portion of the snap ring in connection with the pull wire pair;

fig. 8 is a schematic view of the structure of the middle layer of the tube according to some embodiments of the present invention (single-filament one-press one-weave);

fig. 9 is a schematic view of an intermediate layer structure of a tube according to some embodiments of the present invention (a double-filament one-press two-weave method);

fig. 10 is a cross-sectional view of a hypotube according to some embodiments of the present invention.

The reference numbers are as follows: a housing 100; a fixed shaft 110; a limiting groove 111; turning the knob 120;

a tube body 200; a first pull wire 210; a proximal end 211; a distal end 212; a second pull wire 220; a hollow cavity 230; an inner layer 231; an intermediate layer 232; an outer layer 233; a guidewire lumen 234; a snap ring 240; a through hole 241;

a first slider 300; a second slider 310; a rack 320;

a rotating member 400;

the stress dispersion tube 500.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of 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 thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 3, in some embodiments, a distal adjustable bend sheath comprises: the tube 200, the first sliding member 300, the rotating member 400, and the first traction wire 210. The tube body 200 is provided with a far end 212 and a near end 211, the far end 212 is in front, the near end 211 is in back, the far end 212 of the tube body 200 is flexible, a first traction wire 210 is arranged in the tube body 200, the first traction wire 210 is arranged in the tube body 200, one end of the first traction wire 210 is connected with the far end 212, the first sliding part 300 is connected with the other end of the first traction wire 210, the rotating part 400 is in transmission connection with the first sliding part 300, the rotating part controls the tightening and loosening of the first traction wire 210 through the first sliding part 300, the far end 212 is bent under the tension of the first traction wire 210, the required bending angle position can be reached, the bending adjustability of the tube body 200 at the far end is realized, the operation process is convenient and fast, and the treatment effect and the operation success rate are improved.

Referring to fig. 1 and 3, in some embodiments, the second sliding member 310 is drivingly connected to the rotating member 400, the first sliding member 300 is disposed above the rotating member 400, the second sliding member 310 is disposed below the rotating member 400, the rotating member 400 is disposed between the first sliding member 300 and the second sliding member 310, one end of the first pull wire 210 is fixedly connected to the distal end 212, the first sliding member 300 is fixedly connected to the other end of the first pull wire 210, one end of the second pull wire 220 is fixedly connected to the distal end 212, and the other end of the second pull wire 220 is fixedly connected to the second sliding member 310, when the rotating member 400 rotates, the first sliding member 300 and the second sliding member 310 drivingly connected thereto are moved in opposite directions, thereby controlling the first pull wire 210 to be tightened, the second pull wire 220 to be released, so that the distal end 212 is bent under the pulling force of the pull wire 210, a desired bending angle position can be achieved, and the bending of the tubular body 200 of the distal end 212 can be adjusted, the operation process is convenient and fast, and the treatment effect and the success rate of the operation are improved.

Referring to fig. 1 and 3, in some embodiments, the sheath tube with adjustable bending at the distal end further includes a housing 100, the housing 100 is provided with a fixed shaft 110 and a rotating knob 120, the housing 100 has two left and right sides, the fixed shaft 110 is disposed on an inner wall of the left housing 100, the rotating member is disposed on the fixed shaft 110, the right housing 100 is provided with the rotating knob 120, the proximal end 211 of the tube body 200 is fixedly connected to the left housing 100, a connecting end of the rotating knob 120 penetrates the housing 100 to be connected to the rotating member 400, the connecting end of the rotating knob 120 is connected to the rotating member 400 by a pin, and the rotating member 400 is driven by the rotating knob 120 to rotate along the fixed shaft 110, the rotating member 400 drives the first sliding member 300 and the second sliding member 310 to move oppositely, so that the first pulling wire 210 and the second pulling wire 220 are tightened and released one by the other, and the pulling force generated by the first pulling wire 210 and the second pulling wire 220 controls the tube body 200 to bend at the distal end by a certain angle, each part transmission of this process is connected closely, and transmission efficiency is high, rotates the bending angle that knob 120 just can accurate control distal end 212 at body 200 near-end 211, reaches the position that needs, and operation process convenient and fast, and then improves the success rate of treatment and operation.

It should be noted that, in some embodiments, a scale bar (not marked in the figure) is disposed on an outer wall of a connection portion of the casing 100 and the rotation knob 120, and when the rotation knob 120 rotates by a certain angle, the scale bar correspondingly marks a certain angle of bending of the distal end 212 of the tube 200, so as to further improve accuracy of controlling the bending angle of the distal end 212, enable the tube 200 to be accurately and effectively positioned, and improve a success rate of an operation.

Referring to fig. 1 and 2, in some embodiments, the upper and lower sides of the housing 100 are provided with a limiting groove 111, the first sliding member 300 is disposed on the upper side of the limiting groove 111 of the housing 100, the second sliding member 310 is disposed on the lower side of the limiting groove 111 of the housing 100, the first sliding member 300 and the second sliding member 310 can slide on the limiting groove 111, the rotating member 400 rotates along the fixed shaft 110, the rotating member 400 drives the first sliding member 300 and the second sliding member 310 to slide in opposite directions, make first traction wire 210 and second traction wire 220 tighten up, another release, the certain angle of the bending of distal end 212 body 200 is controlled to the pulling force that first traction wire 210 and second traction wire 220 produced, and this process each part transmission is connected closely, and transmission efficiency is high, can control the bending angle of distal end 212, reaches the position that needs, and operation process convenient and fast, and then improves the success rate of treatment and operation.

Referring to fig. 2, in some embodiments, the racks 320 are disposed on the opposite surfaces of the first sliding member 300 and the second sliding member 310, the first sliding member 300 and the second sliding member 310 are slidably connected to the limiting grooves 111 on the upper and lower sides of the housing 100, the rotating member 400 has a gear structure matched with the racks 320, the gear structure is disposed between the first sliding member 300 and the second sliding member 310, and the precision of the transmission can be improved by the transmission manner of the engagement connection between the rotating member 400 and the racks, so that the bending precision of the tube 200 at the distal end 212 is improved, the transmission speed is high, the bending angle of the distal end 212 can be quickly adjusted, the operation process is convenient and quick, and the success rate of the surgery is improved.

It should be noted that, in some embodiments, referring to fig. 2 and 3, the direction of bending of the sheath distal end 212 can be adjusted bi-directionally by the difference in the rotation direction of the rotation member 400, when the rotation member 400 rotates clockwise, the first sliding member 300 slides backward, the second sliding member 310 slides forward, so that the first pull wire 210 is tightened, the second pull wire 220 is released, and the sheath distal end 212 bends upward; similarly, when the rotating member rotates clockwise, the distal end 212 of the sheath tube bends downward, so that the operation process is convenient and fast, the structure is safe and reliable, and the safety of the operation is ensured.

It should be further noted that, in some embodiments, the first sliding member 300 and the second sliding member 310 are closed chains (not shown), the rotating member 400 is a positioning wheel (not shown), two positioning wheels are provided, the closed chains are sleeved on the positioning wheels, the closed chains can rotate elliptically around the two positioning wheels, the first traction wire 210 and the second traction wire 220 are respectively connected with the upper portion and the lower portion of the closed chains, when the positioning wheels rotate, the upper closed chain and the lower closed chain move in opposite directions, the transmission manner is similar to a bicycle chain transmission, so that the first traction wire 210 is tightened, the second traction wire 220 is released, the chain transmission is stable and reliable, the bending angle of the distal end 212 can be accurately adjusted, and the safety of the operation is ensured.

According to the utility model discloses a some embodiments, refer to fig. 2 and fig. 3, the curved sheath pipe of adjustable distal end still includes stress dispersion pipe 500, stress dispersion pipe 500 sets up the junction at body 200 and casing 100, stress dispersion pipe 500 establishes for the cover with body 200 and is connected, it is fixed connection with casing 100 to use dispersion pipe, because the bending of body 200 can produce bending stress, body 200 is equipped with stress dispersion pipe 500 with the junction of casing 100, can avoid the production of concentrated stress, improve the life of the adjustable curved sheath pipe of distal end, prevent that stress concentration from leading to the crooked production angle error of distal end 212, the precision of the crooked angle of distal end 212 has further been improved, make body 200 can accurate effectual location.

It should be noted that, in some embodiments, the stress dispersion tube 500 is made of an environment-friendly, safe and non-toxic elastic material such as silica gel or TPE, and can play a role in buffering, effectively reduce the stress on the bending of the sheath, and prevent the bending of the distal end 212 from generating an angle error due to stress concentration, so that the tube body 200 can be accurately and effectively positioned.

According to some embodiments of the present invention, referring to fig. 4, the tube body 200 includes a hollow cavity 230, the hollow cavity 230 is composed of a three-layer structure, and an inner layer 231, an intermediate layer 232 and an outer layer 233 are sequentially included from inside to outside along the hollow cavity 230.

In some embodiments, the inner layer 231 is a polymer layer with a low friction coefficient, the friction coefficient of the polymer layer ranges from 0.04 to 0.2, and is made of a polymer material of high density polyethylene or polytetrafluoroethylene, the polyethylene or polytetrafluoroethylene is a common material well known to those skilled in the art, and has the characteristic of a low friction coefficient, the friction coefficient of polyethylene is 0.2, the friction coefficient of polytetrafluoroethylene is 0.04, and other properties are not described herein again, the polymer layer with a low friction coefficient improves the lubricity of the hollow cavity 230, and further improves the permeability of the implantable medical device, so that the success rate of the surgery is further improved.

Referring to fig. 8, 9 and 10, in some embodiments, the intermediate layer 232 is formed of a metal spring, a metal braid or a metal-cut hypotube, which is a common functional component well known to those skilled in the art and will not be described herein; the metal spring is made of a plurality of strands of wire, the density of which becomes gradually less from the distal end 212 to the proximal end 211; the metal braided layer is realized by a mode of one-to-two or one-to-one pressing of 16 strands of single flat wires or a mode of one-to-two or one-to-one pressing of 32 strands of double round wires, and the braiding density is gradually thinned from the far end 212 to the near end 211; a metal-cut hypotube, the metal-cut density also becoming progressively less dense from the distal end 212 to the proximal end 211; the structural design of intermediate level 232 can enough improve the compliance of sheath pipe distal end 212, and then improves the ability through crooked blood vessel, improves the propelling movement performance of sheath pipe near-end 211 simultaneously for body 200 can accurate effectual location, improves the security of operation.

In some embodiments, the outer layer 233 is made of a plurality of polyamide, polyurethane and polyolefin materials with different hardness, the hardness of the outer layer 233 ranges from 41D to 75D, and the hardness gradually hardens with increasing values, the polyamide, polyurethane and polyolefin materials are common materials known to those skilled in the art, and are not described herein, and the hardness of the outer layer 233 gradually hardens from the distal end 212 to the proximal end 211, so that the distal end 212 of the sheath tube is bent by the pulling force of the first traction wire 210 and the second traction wire 220, thereby improving the flexibility of the distal end 212 of the sheath tube, facilitating and rapidly positioning the tube body 200 to a predetermined position, and improving the therapeutic effect.

It is noted that in some embodiments, the stiffness of the tube 200 increases from the distal end 212 to the proximal end 211, such that the proximal end 211 has a higher stiffness and the tube 200 has a smaller bending angle for smooth flow, thereby improving the throughput of the implantable medical device; the density becomes sparsely from distal end 212 to near-end 211 gradually, improves the compliance of sheath pipe distal end 212, and then improves the ability through crooked blood vessel, improves the propelling movement performance of sheath pipe near-end 211 simultaneously, and convenient quick fixes a position body 200 to preset position, has guaranteed treatment.

According to some embodiments of the present invention, referring to fig. 4 and 5, the tube 200 further includes a wire guiding cavity 234, the first drawing wire 210 and the second drawing wire 220 are disposed in the wire guiding cavity 234 and can be tightened and loosened in the wire guiding cavity 234, a pulling force generated by the contraction and loosening of the first drawing wire 210 and the second drawing wire 220 is transmitted to the tube 200 through the wire guiding cavity 234, the tube 200 is pulled to bend the distal end 212, the wire guiding cavity 234 can be disposed in the inner layer 231, the intermediate layer 232, or the outer layer 233 and can be processed according to an actual processing technology, when the wire guiding cavity 234 is further disposed in the inner layer 231, the inner layer 231 is a polymer layer with a low friction coefficient, and has better lubricity; when the guide wire cavity 234 is arranged in the middle layer 232, the middle layer 232 has good flexibility, and the pulling force generated by the first traction wire 210 and the second traction wire 220 can better control the bending angle of the distal end 212 of the sheath tube, so that the positioning accuracy of the tube body 200 is improved; the hardness of the outer layer 233 changes uniformly, the pulling force generated by the first traction wire 210 and the second traction wire 220 can control the bending angle of the distal end 212 of the sheath tube more quickly, the rapid bending performance of the tube body 200 is improved, the structure is safe and reliable, and the operation safety is improved.

It is noted that in some embodiments, the guidewire lumen 234 is also disposed between the inner layer 231 and the intermediate layer 232, both compliant and lubricious; the guide wire cavity 234 is also arranged between the outer layer 233 and the middle layer 232, and has flexibility and toughness with hardness change; the flexibility of the sheath far end 212 can be adjusted according to the arrangement position of the wire guide cavity 234, the adaptability of the sheath is improved, and therefore the treatment effect and the operation success rate are improved.

Referring to fig. 4 and 5, in some embodiments, the guidewire lumen 234 can be configured as a single lumen or dual lumen, when the upper portion of the tube 200 is configured as a single lumen and the first pull wire 210 can be disposed as a single filament within the guidewire lumen 234, when the upper portion of the tube 200 is configured as a left and right dual lumen and the first pull wire 210 can be disposed as a dual filament within the guidewire lumen 234; similarly, when the lower part of the tube body 200 is provided with a single cavity, the second traction wire 220 can be arranged in the guide wire cavity 234 in a single-wire mode, and when the lower part of the tube body 200 is provided with a left cavity and a right cavity, the second traction wire 220 can be arranged in the guide wire cavity 234 in a double-wire mode; first traction wire 210 and second traction wire 220 can be provided with one in single intracavity and set up for single chamber monofilament, first traction wire 210 and second traction wire 220 can be provided with two in the two-chamber and set up for two-filament of two-chamber, single chamber monofilament sets up and can improve first traction wire 210 and second traction wire 220 gliding compliance in seal wire chamber 234, two-filament of two-chamber sets up and makes first traction wire 210 and second traction wire 220 can bear bigger pulling force, further improve the bending angle of control sheath pipe distal end 212, its structure safe and reliable, the security of operation is improved.

It should be noted that, referring to fig. 6, in some embodiments, the tube 200 further includes a snap ring 240, the snap ring 240 is disposed inside the distal end 212, the snap ring 240 is used for fixing the first traction wire 210 and the second traction wire 220, when the snap ring 240 is respectively provided with a through hole 241 at the upper and lower sides, the first traction wire 210 passes through the through hole 241 fixedly connected to the snap ring 240, and the first traction wire 210 and the second traction wire 220 are fixedly connected to a single wire of the distal end 212 through the snap ring 240, where the single wire is fixedly connected to one of the first traction wire 210 or the second traction wire 220 separately.

Further, referring to fig. 5 and 7, in some embodiments, the upper and lower guide wire cavities 234 of the tube 200 are dual-lumen, the upper and lower portions of the snap ring 240 are respectively provided with two through holes 241, the first pull wire 210 passes through the guide wire cavity 234 dual-lumen provided at the upper portion of the tube 200, the first pull wire 210 is fastened to the snap ring 240, and both ends of the first pull wire 210 are fixedly connected to the proximal end 211; the second traction wire 220 penetrates through a guide wire cavity 234 arranged at a double cavity at the lower part of the tube body 200, the second traction wire 220 is fastened on a clamping ring 240, and two ends of the second traction wire 210 are fixedly connected with the near end 211 in a double-wire mode; the double-wire fixed connection means that the two first traction wires 210 or the two second traction wires 220 are fixedly connected, the double-cavity double-wire arrangement enables the first traction wires 210 and the second traction wires 220 to bear larger pulling force, the bending angle of the distal end 212 of the sheath tube is further improved, the structure is safe and reliable, and the operation safety is improved.

According to the utility model discloses a some embodiments, first traction wire 210 and second traction wire 220 are stainless steel, further make by the fabulous steel wire of compliance, in the adjustable curved sheath pipe use of distal end, first traction wire 210 and the flexible control of the bending angle that second traction wire 220 compliance also can influence sheath pipe distal end 212, for the improvement precision that can be better, further choose the fabulous steel wire of toughness as the material of first traction wire 210 and second traction wire 220 for use, make first traction wire 210 and second traction wire 220 can bear sufficient pulling force, fatigue resistance can be good, make the sheath pipe can be accurate at distal end 212 carry out the bending angle control, improve the success rate of operation.

It should be noted that, in some embodiments, the first pulling wire 210 and the second pulling wire 220 are also tungsten wires and nickel-titanium wires, and are made of a high-brightness developing material, and have high strength, so that the first pulling wire 210 and the second pulling wire 220 can bear sufficient tensile force, and the fatigue resistance is good, so that the sheath can accurately control the bending angle at the distal end 212; tungsten filament and nickel titanium wire have the highlight and develop, and can form dual development with the development mark cooperation that sets up on the body 200, and the effect is the length that further shows body 200 entering guide catheter and observes body 200 bending angle in the operation, and the highlight is developed and is made convenient operation when the sheath pipe uses, improves the operation success rate.

In some embodiments, the first pull wire 210 and the second pull wire 220 are designed to be circular, elliptical or rectangular in cross-section, and the guidewire lumen 234 is correspondingly designed to be circular, elliptical or rectangular in cross-section; when the cross section of the first traction wire 210 and the second traction wire 220 is designed to be circular, the first traction wire 210 and the second traction wire 220 can flexibly slide in the circular guide wire cavity 234 and prevent kinking; when the cross sections of the first traction wire 210, the second traction wire 220 and the guide wire cavity 234 are designed to be rectangular, the flexibility is ensured, and the tube wall of the tube body 200 is thinner; when the cross sections of the first traction wire 210, the second traction wire 220 and the guide wire cavity 234 are designed to be oval, the flexibility is further prevented from being guaranteed, and the tube wall of the tube body 200 is thinner, so that the treatment effect and the operation success rate are improved.

According to some embodiments of the present invention, the tube 200 further comprises a developing mark (not shown), the developing mark is disposed on the bent section of the distal end 212, and when the developing mark is the outer wall of the distal end 212 coated with a developing material, the outer wall of the outer layer 233 can be coated with the developing material; when the developing material is added in the outer layer 233, the developing effect can be achieved; the outer layer 233 is made of a material with gradually changing hardness, and has a good bending property, the developing mark is used for displaying the length of the tube body 200 entering the guiding catheter and observing the bending angle of the tube body 200 in the operation, the guiding catheter is a common material well known by those skilled in the art, and is not described herein again, and the developing mark facilitates the operation of the sheath tube when in use, and improves the success rate of the operation.

It should be noted that, in some embodiments, the development mark is also a tungsten spring (not shown), the tungsten spring is sleeved on the distal end 212 bending section, the tungsten spring can be disposed on the middle layer 232 or the outer layer 233, or a layer of tungsten spring is added on the outer layer 233; the material of the middle layer 232 can be replaced by a tungsten wire spring, or the tungsten wire spring is arranged between the middle layer 232 and the outer layer 233, the tungsten wire spring can be bent with the far end 212, the length of the tube body 200 entering the guide catheter can be displayed, and the bending angle of the tube body 200 can be observed in an operation, so that the sheath tube is convenient to operate when in use, and the success rate of the operation is improved.

It should be further noted that, in some embodiments, the developing material can be made of a radiopaque material made of pt-ir alloy, ta, stainless steel or w, or a material made of barium sulfate, bismuth trioxide or w powder with a non-projected line, and the developing material made of the non-projected material can further improve the developing effect, so that the sheath tube is convenient to operate when in use, and the success rate of the operation is improved.

In some embodiments, the housing 100 can protect the internal structure, the first sliding member 300, the second sliding member 310 and the rotating member 400 are hermetically installed in the housing 100, and can be effectively prevented from being contaminated by blood or body fluid of a human body, further, the first sliding member 300, the second sliding member 310 and the rotating member 400 are prevented from being corroded, so that the transmission efficiency is ensured, the service life of the sheath is prolonged, the transmission assembly of the proximal end 211 can accurately control the bending angle of the distal end 212 of the sheath, the positioning accuracy of the sheath is improved, and the success rate of the surgery is improved.

It should be noted that the rotation knob 120, the housing 100, the first sliding member 300, the second sliding member 310 and the rotation member 400 can be made of ABS + PC material, which has good combination property, good chemical stability and strong impact resistance, and further ensures the safety of the operation.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art.

Claims (10)

1. A distal adjustable bend sheath, comprising:

a body (200) comprising a distal end (212) and a proximal end (211), the distal end (212) being compliant;

a first pull wire (210) having one end coupled to the distal end (212);

a first slider (300) connected to the other end of the first traction wire (210);

the rotating piece (400) is in transmission connection with the first sliding piece (300) and controls the first traction wire (210) to be tightened or loosened through the first sliding piece (300).

2. The distal adjustable curved sheath of claim 1, further comprising:

the second sliding piece (310) is in transmission connection with the rotating piece (400);

a second pull wire (220) having one end connected to the distal end (212) and the other end connected to the second slider (310);

the rotating member (400) drives the first sliding member (300) and the second sliding member (310) to move in opposite directions, so that the first traction wire (210) and the second traction wire (220) are controlled to be tightened and loosened.

3. The sheath with the adjustable bending distal end according to claim 2, further comprising a housing (100), wherein a fixed shaft (110) is disposed on the left side of the housing (100), a rotating knob (120) is disposed on the right side of the housing, the rotating member (400) is sleeved on the fixed shaft (110), and the rotating knob (120) is adapted to drive the rotating member (400) to rotate along the fixed shaft (110).

4. The sheath of claim 3, wherein the upper and lower sides of the housing (100) are provided with a limiting groove (111), and the first sliding member (300) and the second sliding member (310) are slidably disposed in the limiting groove (111).

5. The sheath according to claim 2, wherein the first sliding member (300) and the second sliding member (310) are provided with a rack (320) on opposite sides, and the rotating member (400) adopts a gear structure matched with the rack (320).

6. The distal adjustable bending sheath according to claim 3, further comprising a stress-dissipating tube (500), wherein the stress-dissipating tube (500) is disposed at a junction of the tube body (200) and the housing (100).

7. The distal adjustable bending sheath according to claim 2, wherein the tube body (200) has a hollow cavity (230), and an inner layer (231), an intermediate layer (232) and an outer layer (233) are sequentially arranged along the hollow cavity (230) from inside to outside.

8. The distal end adjustable bending sheath according to claim 7, wherein the tube body (200) has a guide wire cavity (234), the guide wire cavity (234) can be disposed at any layer of the tube body (200) or between two adjacent layers, and the guide wire cavity (234) can be disposed as a single cavity or a dual cavity, and the first traction wire (210) and the second traction wire (220) can be disposed with one in the single cavity or two in the dual cavity.

9. The distal adjustable bending sheath according to claim 2, wherein the first traction wire (210) and the second traction wire (220) are tungsten wires, nickel titanium wires or stainless steel wires.

10. The distal end adjustable bending sheath according to claim 3, wherein the tube body (200) further comprises visualization markers disposed at the distal end (212) bending section.

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