CN215384573U - Visual controllable curved nipple incision knife - Google Patents

Abstract

The utility model relates to the technical field of nipple incision knives, and provides a visual controllable bent nipple incision knife which comprises a flexible bending part, a flexible knife bar, a handle operation part and a knife wire; the flexible bending part is provided with a camera channel, an instrument channel and four groove-shaped cutter wire channels; the flexible cutter bar is provided with a camera channel, an instrument channel and four cutter wire channels; the handle operation part comprises a handle shell, a first operation part and a second operation part, the handle shell is provided with a camera channel and an instrument channel, the first operation part comprises a dial wheel, a rotating shaft system and an electrode column, the rotating shaft system comprises a rotating shaft and a winding wheel, and the winding wheel is provided with a double-layer track; the four cutter wires are fixedly connected to the reel in pairs. The flexible bending part is a rigidity increasing type hollow framework and is provided with scale marks through laser code spraying. The utility model can visualize the processes of intubation and the like, realize the direction of any spatial posture, increase the flexibility of bending of the incision knife, realize large-angle bending, accurately control the insertion depth and improve the control precision and efficiency.

Description

Visual controllable curved nipple incision knife

Technical Field

The utility model relates to the technical field of an accessory-a papillary incision knife for a digestive endoscope, in particular to a visual controllable curved papillary incision knife which is used for digestive endoscopy operation-Endoscopic Retrograde Cholangiopancreatography (ERCP) and incidental treatment thereof.

Background

Calculus, tumor and the like in the biliary and pancreatic duct of the digestive tract are highly common and fatal. Endoscopic retrograde cholangiopancreatography through the gastrointestinal tract is the main treatment. Because the biliary pancreatic duct is located at a deep position in the digestive tract, the existing ERCP is a digestive endoscope minimally invasive surgery with the greatest difficulty and the highest risk, the intubation over-selection difficulty is high, the operation precision is low, and the problems of inflammation, bleeding, perforation and other complications are urgently solved.

The duodenoscope nipple including myxectomy (EST) is an endoscopic treatment means derived based on ERCP, and is a treatment technology for incising the duodenoscope nipple sphincter and the end part of common bile duct by using a nipple incision knife under an endoscope. EST has become the primary step in therapeutic ERCP at present, and has great operational difficulty and extremely high risk. The nipple incision knife is an instrument necessary for completing ERCP and EST operations, and in a narrow duodenal environment, the nipple incision knife is required to pass through an occluded nipple and accurately reselect to a bile pancreatic duct, so that the incision knife has high flexibility, can obtain a desired direction, and completes tasks such as lithotripsy, tumor biopsy, stent implantation intervention and the like.

The existing nipple incision knife used clinically only has a single degree of freedom, the direction of the incision knife is controlled by pulling a knife wire, and the biliary-pancreatic intubation hyper-selection is realized by depending on the coordinated motion of a duodenoscope and a forceps lifter. In order to increase the flexibility of the cutting knife, in the prior art, an adjustable bending cutting knife realizes flexible pointing by increasing the degree of freedom of the cutting knife, and the knife head of the adjustable bending cutting knife can be bent and rotated simultaneously, so that the problem of inflexibility of the single-degree-of-freedom cutting knife is solved, but the following limitations still exist:

(1) the bending movement is still achieved by a wire pull, the rotational orientation of the cutting head of which is dependent on the rotation of the wire throughout the entire cutting knife. In the twisting process, the internal friction loss torque of the incision knife body and the endoscope biopsy cavity can lead to the difficulty in ensuring the control precision, and the multiple twisting can lead to the distortion and even the blockage of the internal cavity of the incision knife, so that the intervention of guide wires and other surgical instruments is not facilitated. This lack of dexterity results in poor control accuracy, inefficient work and high risk.

(2) The bending section of the nipple incision knife used in clinic at present is made of polymer, and the hardness of the bending section is lower than that of the knife rod, so that the selective pointing purpose can be achieved by stretching and fixing the knife wire at the tail end to realize the deformation of the bending section. In the process of ERCP retrograde intervention in the bile-pancreatic duct, the incision knife needs to bend a larger angle to intubate. And polymer material elasticity is relatively poor, hardly resumes original form after bending deformation many times, and when bending angle was too big moreover, cutter arbor and curved segment connecting portion took place the fold easily and collapse, seriously influences efficiency and precision that the bile pancreatic duct intervened.

(3) The existing nipple incision knife used in clinic does not have an endoscopic camera, and can only rely on the visual field fed back by a duodenoscope to complete the intubation and over-selection of the cholepancreatic duct. After the incision knife is inserted into the bile pancreatic duct, the visual field in the cavity cannot be obtained, and the position can be judged only by means of DSA (digital subtraction angiography), so that doctors are subjected to a large amount of radiation hazards.

(4) In the process of intervention of the incision knife, perforation is easy to occur when the incision knife is inserted too deeply and then cut, and the incision of the sphincter can not be realized when the incision knife is too shallow. The existing nipple incision knife is limited by polymer materials, the bending part lacks or only has a small amount of attached marks, the precision is low, and the accurate assessment of the intervention depth by a doctor is not facilitated.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides a visual controllable curved nipple incision knife which is provided with a camera channel and can visually perform the processes of over-selection intubation, intrabiliary pancreatic duct implantation interventional therapy and the like, four knife wires are matched and driven in two pairs to realize the direction of any spatial posture, a rigidity increasing type hollowed-out framework can increase the bending flexibility of the incision knife and realize large-angle bending, accurately designed scale marks can accurately control the insertion depth, the control precision and efficiency can be improved, the structural design is reasonable, the adjustment is convenient and reliable, the operation is facilitated, and the risk is reduced.

The technical scheme of the utility model is as follows:

a visual controllable curved nipple incision knife is characterized in that: comprises a flexible bending part, a flexible cutter bar, a handle operating part and a cutter wire;

the flexible bending part comprises a distal head, a middle section and a proximal flexible bending section; the flexible bending part is axially provided with a first camera channel and a first instrument channel which are communicated front and back, the flexible bending part is provided with four first cutter wire channels at the middle section and the near-end flexible bending section, the part of each first cutter wire channel at the near-end flexible bending section is outwards provided with a groove form, and the four first cutter wire channels are uniformly distributed along the circumferential direction of the near-end flexible bending section;

the flexible cutter bar is axially provided with a second camera channel, a second instrument channel and four second cutter wire channels which are communicated in the front-back direction, and the four second cutter wire channels are uniformly distributed along the circumferential direction of the flexible cutter bar;

the handle operation part comprises a handle shell, a first operation part and a second operation part which are arranged in an up-down symmetrical mode;

the handle shell forms a cavity inside, the near end of the handle shell is provided with two hollow tubular protruding parts, and the two tubular protruding parts respectively form a third camera channel and a third instrument channel;

the first operation part comprises a dial wheel, a rotating shaft system and an electrode column, and the rotating shaft system comprises a rotating shaft and a winding wheel; the handle shell is provided with a first rotating shaft mounting hole and a second rotating shaft mounting hole which are coaxial, the rotating shaft is in a stepped shaft form and sequentially comprises a first shaft section, a second shaft section with the diameter larger than that of the first shaft section and a third shaft section with the diameter smaller than that of the second shaft section, the first shaft section sequentially penetrates through the first rotating shaft mounting hole and the second rotating shaft mounting hole and then is fixedly connected with the shifting wheel, a shaft shoulder of the second shaft section abuts against the outer side wall of the handle shell, and the third shaft section is fixedly connected with the electrode column; the reel is arranged in the cavity, sleeved and clamped on the rotating shaft, and a double-layer track is arranged on the reel;

the proximal end of the flexible bending part is fixedly connected with the distal end of the flexible cutter bar, the proximal end of the flexible cutter bar is fixedly connected with the distal end of the handle operation part, the first camera channel, the second camera channel, the cavity and the third camera channel are sequentially communicated, the first instrument channel, the second instrument channel, the cavity and the third instrument channel are sequentially communicated, and the first cutter wire channel and the second cutter wire channel which correspond to the positions are sequentially communicated with the cavity;

the number of the cutter wires is four, the far end of each cutter wire is fixedly connected to the head of the far end, and the near end of each cutter wire sequentially penetrates through the corresponding first cutter wire channel and the corresponding second cutter wire channel, then enters the cavity and is fixedly connected to the reel; the near end of one of the cutter wires in the pair of opposite cutter wires is wound and fixed on one track of the reel of the first operating part, the near end of the other cutter wire in the pair of opposite cutter wires is reversely wound and fixed on the other track of the reel of the first operating part, the near end of the other cutter wire in the pair of opposite cutter wires is wound and fixed on one track of the reel of the second operating part, and the near end of the other cutter wire in the pair of opposite cutter wires is reversely wound and fixed on the other track of the reel of the second operating part; the cutter wire is an elastic metal wire and is provided with an insulating coating.

Furthermore, the proximal end flexible bending section is provided with cutting grooves at two sides of each first cutter wire channel at an axial distance a, and the cutting grooves of two adjacent first cutter wire channels are axially arranged at intervals.

Further, the axial distance a gradually increases from the distal end to the proximal end of the flexible bend.

Further, the proximal flexible bending section is provided with scale marks on the outer surface.

Furthermore, the scale mark is realized by a laser code spraying technology.

Furthermore, the first operating part also comprises an elastic limiting mechanism, and the elastic limiting mechanism comprises a limiting shaft sleeve, a spring and a top ball;

the handle shell is internally provided with a limiting boss which extends inwards from the inner side wall, and a cylindrical groove with the axis vertical to the axis of the rotating shaft is formed in the limiting boss;

the limiting shaft sleeve is sleeved and clamped on the rotating shaft, and a plurality of hemispherical grooves are uniformly formed in the outer surface of the limiting shaft sleeve along the circumferential direction;

the spring is arranged in the cylindrical groove, and the ejecting ball abuts against the spring on one side and abuts against the hemispherical groove on the other side.

Furthermore, an electrode column protective sleeve is arranged on the outer side of the handle shell, and the electrode column extends into the electrode column protective sleeve.

Further, the rotating thumb wheel drives the corresponding knife wire to move towards the near end to form a bow knife; through cooperative control of the thumb wheel of the first operation part and the thumb wheel of the second operation part, the four knife wires form two pairs to cooperatively drive the flexible bending part, and the pointing direction of any posture of the flexible bending part space is realized.

The utility model has the beneficial effects that:

(1) the utility model is provided with the camera channel configurable camera on the handle operating part, the flexible bending part and the flexible cutter bar, can provide real-time and accurate visual feedback of papilla and cholangiopancreatico lumen for doctors, overcomes the invisible defect of the papilla incision knife or the contrast tube for executing ERCP intubation operation in the prior art, solves the most prominent problems of the doctors in the prior ERCP operation, namely high blind intubation failure rate and more complications, and greatly improves the accuracy of cholangiopancreaticosa disease diagnosis in the interventional process. In addition, the intra-cavity vision provided by the camera is expected to replace the DSA (digital subtraction technique) technology used in clinic at present, and the threat of the radiation of the technology to the health of doctors is thoroughly avoided.

(2) According to the nipple incision knife, the first operation part and the second operation part are arranged in the handle operation part and are respectively used for controlling the pair of knife wires, the four knife wires can be matched into two pairs to drive the flexible bending part through the cooperative control of the thumb wheels of the two operation parts, the direction of any space posture can be realized, the flexible direction adjustment can be realized without rotating, the control is more accurate, and the technical problems that the existing nipple incision knife depends on the whole rotation direction adjustment, so that the friction loss torque inside the incision knife body and an endoscope biopsy cavity channel is low in control precision, and the cavity channel inside the incision knife is distorted and deformed and even blocked due to multiple times of torsion are solved. Each knife wire configured by the utility model can be connected with high-frequency electricity to cut tissues, so that the technical problem of inconvenient operation caused by only cutting one knife wire in the existing nipple incision knife is solved. In addition, the mapping of the movement direction of the tail end of the nipple incision knife and the visual field direction of the configured camera is kept consistent, so that a doctor can intuitively control the direction of the nipple incision knife according to the fed back visual information in the cavity, and the technical problems of non-intuitive operation and low efficiency caused by the movement form of unidirectional bending, matched rotation and the like of the existing nipple incision knife are solved.

(3) The flexible bending part adopts the rigidity increasing type hollow framework, so that the bending positioning movement of the incision knife can be more flexible, the rigidity increasing type design can more easily realize large-angle bending, the efficiency and the precision of retrograde intervention of the incision knife from a duodenal papilla to a bile-pancreatic duct are improved, and the technical problem that the conventional papilla incision knife is easy to collapse and deform when the bending angle is too large in the process of inserting an ERCP retrograde intervention bile-pancreatic duct due to the fact that the bending section lacks of a framework structure due to the limitation of polymer materials of the bending section, and the efficiency and the precision of inserting the duct are influenced is solved.

(4) The flexible bending part is accurately provided with the scale marks through laser code spraying, and compared with the existing nipple incision knife with the bending part made of polymer materials used clinically, the nipple incision knife can judge the insertion depth more accurately, and is convenient for a doctor to evaluate the follow-up operations of stent implantation and the like.

(5) The handle operating part of the utility model can limit the rotation angle of the thumb wheel by arranging the elastic limiting mechanism, and avoids the phenomenon that the thumb wheel automatically rotates under the traction action of the knife wire after leaving hands, so that the shape of the bow knife is unstable.

Drawings

Fig. 1 is a schematic structural view of a visual controllable curved-nipple incision knife of the present invention in a non-working state.

Fig. 2 is a schematic structural view of the controllable curved-nipple incision knife of the present invention in a working state.

Fig. 3 is a schematic structural view of a flexible bending part in a visual controllable curved nipple incision knife in a non-working state.

Fig. 4 is a schematic structural view of a flexible bending part in a visual controllable curved nipple incision knife of the present invention in a working state.

Fig. 5 is a schematic structural view of a flexible bending part in the visual controllable curved nipple incision knife of the present invention under various working conditions.

FIG. 6 is a top view of a flexible curved portion of a visually controllable curved teat cutting knife of the present invention according to one embodiment.

FIG. 7 is an enlarged view of a portion of the flexible bend in the visually controlled curved teat cutting knife of FIG. 6.

FIG. 8 is a sectional view A-A of the proximal flexible curved section of the flexible curve in the visually controllable curved teat cutting knife of FIG. 7.

FIG. 9 is a B-B cross-sectional view of the proximal flexible curved segment of the flexible curve in the visually controllable curved teat cutting knife of FIG. 7.

FIG. 10 is a C-C cross-sectional view of the middle section of the flexible bend in the visually controllable curved teat cutting knife of the utility model of FIG. 7.

FIG. 11 is a D-view of the flexible bend in the visually controllable curved-nipple incision knife of the utility model in FIG. 7.

FIG. 12 is a cross-sectional view of the flexible bend in the visually controllable curved teat cutting knife of FIG. 7 taken along the line E-E.

FIG. 13 is a schematic cross-sectional view of the flexible blade of the controllable curved-nipple incision knife according to the present invention.

Fig. 14 is a perspective view of the handle operating part of the controllable curved-nipple incision knife according to the present invention.

FIG. 15 is a front view of the handle operating portion of the visually controllable curved-nipple incision knife of the present invention shown in FIG. 14.

Fig. 16 is a schematic structural view of a first operating part of a handle operating part in the visual controllable curved nipple incision knife according to the first embodiment of the present invention.

FIG. 17 is a sectional view taken along the line F-F of the handle operation part of the visual controllable curved-nipple incision knife according to the second embodiment of the present invention.

Fig. 18 is a schematic structural view of the elastic limiting mechanism of the handle operating part in the visual controllable curved nipple incision knife in fig. 17.

Fig. 19 is a schematic view of a reel in the visually controllable curved-nipple cutting knife of the present invention.

Fig. 20 is a top plan view of the reel of fig. 19.

In the figure, 1-flexible bending part, 1-1-distal head part, 1-2-middle section, 1-3-proximal flexible bending section, 1-4-first camera channel, 1-5-first instrument channel, 1-6-first knife wire channel, 1-7-cutting groove and 1-8-scale mark; 2-a flexible cutter bar, 2-1-a second camera channel, 2-2-a second instrument channel and 2-3-a second cutter wire channel; 3-handle operation part, 3-1-handle shell, 3-1-1-first rotating shaft mounting hole, 3-1-2-second rotating shaft mounting hole, 3-1-3-cylindrical groove, 3-1-4-hemispherical groove, 3-1-5-electrode column protective sleeve, 3-2-third camera channel, 3-3-third instrument channel, 3-4-thumb wheel, 3-5-electrode column, 3-6-rotating shaft, 3-7-reel, 3-8-limit shaft sleeve, 3-9-spring and 3-10-top bead; 4-cutting the silk.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and specific embodiments.

The "proximal" end is the end closer to the operator and the "distal" end is the end further from the operator.

As shown in fig. 1 and 2, the visual controllable curved nipple incision knife of the present invention includes a flexible bending portion 1, a flexible knife bar 2, a handle operation portion 3, and a knife wire 4.

As shown in fig. 3, 6 and 7, the flexible bending part 1 comprises a distal head part 1-1, a middle section 1-2 and a proximal flexible bending section 1-3. Wherein, distal end head 1-1 is nearly circular cone structure, and near-end flexible bending section 1-3 is a section of surface area scale mark's fretwork insulating tube body:

as shown in fig. 8, 9, 10, 11, and 12, the flexible bending portion 1 is axially provided with a first camera channel 1-4 and a first instrument channel 1-5 which are through from front to back, the flexible bending portion 1 is provided with four first knife wire channels 1-6 at the middle section 1-2 and the proximal end flexible bending section 1-3, each of the first knife wire channels 1-6 at the proximal end flexible bending section 1-3 is outwardly provided with a groove, and the four first knife wire channels 1-6 are uniformly distributed along the circumferential direction of the proximal end flexible bending section 1-3 and are arranged at the outer sides of the first camera channel 1-4 and the first instrument channel 1-5.

In the first embodiment, as shown in fig. 6, 7 and 12, the proximal flexible curved sections 1 to 3 are provided with slots 1 to 7 on both sides of each first cutter wire channel 1 to 6 at an axial distance a, and the slots 1 to 7 of two adjacent first cutter wire channels 1 to 6 are provided at an axial distance. The variable-rigidity and non-variable-rigidity bending of the flexible bending portion 1 can be achieved through different grooving modes, a variable-rigidity hollow structure is adopted in the first embodiment, specifically, the axial distance a is gradually increased from the far end to the near end of the flexible bending portion 1, so that the flexible bending portion forms a rigidity increasing type hollow framework, the bending positioning movement of the incision knife can be more flexible, large-angle bending is easier to achieve through rigidity increasing type design, the efficiency and the precision of the incision knife in retrograde intervention to a bile pancreatic duct from a duodenal papilla are improved, and the technical problem that due to the fact that a polymer material of the bending section of an existing papilla incision knife is limited, when the bending angle is too large, the bending section is prone to collapse and deform in the process of inserting the bile pancreatic duct in the retrograde intervention of an ERCP, and the efficiency and the precision of inserting are affected is solved.

In the first embodiment, as shown in fig. 6 and 7, the proximal flexible curved section 1-3 is provided with scale marks 1-8 on the outer surface. The scale marks 1-8 are realized by a laser code spraying technology, and compared with the existing nipple incision knife with a polymer material bent part used clinically, the insertion depth can be judged more accurately, so that a doctor can evaluate the follow-up stent placement and other operations conveniently. Specifically, in order to improve the control precision, the utility model can be provided with scale marks at the positions of the start point, the stop point, the quarter point and the midpoint, and can be additionally provided with other identification positions according to the requirements.

As shown in fig. 13, the flexible cutter bar 2 is axially provided with a second camera channel 2-1, a second instrument channel 2-2, and four second cutter wire channels 2-3, which are through from front to back, and the four second cutter wire channels 2-3 are uniformly distributed along the circumferential direction of the flexible cutter bar 2. Wherein, the flexible cutter bar 2 is an insulating sheath tube.

As shown in fig. 14 and 15, the handle operation part 3 includes a handle housing 3-1, and a first operation part and a second operation part which are arranged vertically symmetrically. Wherein the second operation part is positioned below the first operation part.

The handle shell 3-1 forms a cavity inside, the proximal end of the handle shell 3-1 is provided with two hollow tubular protruding parts, and the two tubular protruding parts form a third camera channel 3-2 and a third instrument channel 3-3 respectively.

The structure of the handle operation part 3 will be described below with reference to the first operation part as an example, with reference to the accompanying drawings:

in the first embodiment, as shown in fig. 16, the first operation part comprises a thumb wheel 3-4, a rotating shaft system and an electrode pole 3-5, and the rotating shaft system comprises a rotating shaft 3-6 and a reel 3-7. In the second embodiment of the present invention, as shown in fig. 17, the first operating portion further includes an elastic stopper mechanism.

Specifically, a first rotating shaft mounting hole 3-1-1 and a second rotating shaft mounting hole 3-1-2 which are coaxial are formed in the handle shell 3-1, the rotating shaft 3-6 is in a stepped shaft form and sequentially comprises a first shaft section, a second shaft section with the diameter larger than that of the first shaft section and a third shaft section with the diameter smaller than that of the second shaft section, the first shaft section sequentially penetrates through the first rotating shaft mounting hole 3-1-1 and the second rotating shaft mounting hole 3-1-2 and then is fixedly connected with the thumb wheel 3-4, a shaft shoulder of the second shaft section abuts against the outer side wall of the handle shell 3-1, and the third shaft section is fixedly connected with the electrode column 3-5. The reel 3-7 is arranged in the cavity and sleeved and clamped on the rotating shaft 3-6, as shown in fig. 19 and 20, a double-layer track is arranged on the reel 3-7, and the double-layer track is two parallel circular tracks.

As shown in fig. 17 and 18, the elastic limiting mechanism comprises a limiting shaft sleeve 3-8, a spring 3-9 and a top bead 3-10; the handle shell 3-1 is provided with a limiting boss which extends inwards from the inner side wall, and a cylindrical groove 3-1-3 with the axis vertical to the axis of the rotating shaft 3-6 is formed in the limiting boss; the limiting shaft sleeve 3-8 is sleeved and clamped on the rotating shaft 3-6, and a plurality of hemispherical grooves 3-1-4 are uniformly formed in the outer surface of the limiting shaft sleeve 3-8 along the circumferential direction; the springs 3-9 are arranged in the cylindrical grooves 3-1-3, and the top beads 3-10 are abutted against the springs 3-9 on one side and the hemispherical grooves 3-1-4 on the other side.

The electrode column protective sleeve 3-1-5 is arranged on the outer side of the handle shell 3-1, and the electrode column 3-5 extends into the electrode column protective sleeve 3-1-5.

The connection relation and the position relation of each part are as follows:

the near end of the flexible bending portion 1 is fixedly connected with the far end of the flexible cutter rod 2, the near end of the flexible cutter rod 2 is fixedly connected with the far end of the handle operation portion 3, the first camera channel 1-4, the second camera channel 2-1, the cavity and the third camera channel 3-2 are sequentially communicated, the first instrument channel 1-5, the second instrument channel 2-2, the cavity and the third instrument channel 3-3 are sequentially communicated, and the first cutter wire channel 1-6 and the second cutter wire channel 2-3 corresponding to the positions are sequentially communicated with the cavity. On one hand, the utility model can provide real-time and accurate visual feedback of papilla and cholangiopancreatico lumen for doctors by arranging the configurable camera of the camera channel on the handle operation part, the flexible bending part and the flexible cutter bar, overcomes the invisible defect of the papilla incision knife or the contrast tube for executing the ERCP intubation operation in the prior art, solves the most prominent problems of the current ERCP operation, namely high blind intubation failure rate and more complications, and greatly improves the accuracy of diagnosis of cholangiopancreaticosa disease in the interventional process. In addition, the intra-cavity vision provided by the camera is expected to replace the DSA (digital subtraction technique) technology used in clinic at present, and the threat of the radiation of the technology to the health of doctors is thoroughly avoided. On the other hand, the utility model can be configured with various instruments such as guide wires, laser fibers, biopsy forceps, lithotomy baskets and the like by arranging the instrument channel so as to meet the requirements of different operations.

The number of the cutter wires 4 is four, the far end of each cutter wire 4 is fixedly connected to the head part 1-1 of the far end, and the near end of each cutter wire 4 sequentially penetrates through the corresponding first cutter wire channel 1-6 and the corresponding second cutter wire channel 2-3 to enter the cavity and is fixedly connected to the reel 3-7. Specifically, the proximal end of one of the pair of opposed cutter wires is wound around and fixed to one track of the reel of the first operating portion, the proximal end of the other cutter wire is reversely wound around and fixed to the other track of the reel of the first operating portion, the proximal end of the other of the pair of opposed cutter wires is wound around and fixed to one track of the reel of the second operating portion, the proximal end of the other cutter wire is reversely wound around and fixed to the other track of the reel of the second operating portion, and the proximal end of each cutter wire is fixed to a through hole in the reel after winding is completed. The cutter wire 4 is an elastic metal wire and is provided with an insulating coating; the part of the cutter wire 4, which is positioned in the first cutter wire channel 1-6, is coaxial with the circular arc section of the first cutter wire channel 1-6.

The working principle of the utility model is explained below with reference to the drawings:

fig. 4 is a schematic structural view of the flexible bending portion of the controllable curved-nipple incision knife in one working state according to the present invention. In fig. 4, the present invention forms a bow knife by rotating the thumb wheel to drive the corresponding knife wire to move towards the proximal end. Specifically, taking a pair of knife wires controlled by the first operation part as an example, the thumb wheel 3-4 is rotated to drive the rotating shaft 3-6 to rotate and further drive the reel 3-7 to rotate, so that one knife wire of the pair of knife wires is tensioned, the other knife wire of the pair of knife wires is loosened, the tensioned knife wire is pulled outwards along the first knife wire channel 1-6 in the form of a groove to form a bow knife, and the opposite knife wire is still positioned in the groove of the first knife wire channel 1-6. Meanwhile, the rotating thumb wheel 3-4 drives the rotating shaft 3-6 and the limiting shaft sleeve 3-8 to rotate, the top bead 3-10 is pressed down and clamped into the hemispherical groove 3-1-4 again after rotating for a fixed angle, the rotating angle of the thumb wheel 3-4 is limited, and the phenomenon that the thumb wheel automatically rotates under the drawing action of a cutter wire after leaving hands of a user to cause the unstable shape of the bow cutter is avoided.

Fig. 5 is a schematic structural view of a flexible bending portion of the controllable curved-nipple incision knife in various working states. According to the utility model, the first operating part and the second operating part are arranged in the handle operating part and are respectively used for controlling the pair of the knife wires, and the poking wheels of the first operating part and the poking wheels of the second operating part are cooperatively controlled, so that the four knife wires are matched into two pairs to drive the flexible bending part, the direction of any posture of the space of the flexible bending part is realized, the flexible direction adjustment can be realized without rotating, the control is more accurate, and the technical problems that the existing nipple incision knife depends on the integral rotation direction adjustment, the friction loss torque inside the incision knife body and the endoscopic biopsy cavity channel is caused, the control precision is low, and the internal cavity channel of the incision knife is distorted and deformed and even blocked due to multiple twists are solved.

Each knife wire configured by the utility model can be connected with high-frequency electricity to cut tissues, so that the technical problem of inconvenient operation caused by only cutting one knife wire in the existing nipple incision knife is solved.

In addition, the mapping of the movement direction of the tail end of the nipple incision knife and the visual field direction of the configured camera is kept consistent, so that a doctor can intuitively control the direction of the nipple incision knife according to the fed back visual information in the cavity, and the technical problems of non-intuitive operation and low efficiency caused by the movement form of unidirectional bending, matched rotation and the like of the existing nipple incision knife are solved.

It is to be understood that the above-described embodiments are only a few embodiments of the present invention, and not all embodiments. The above examples are only for explaining the present invention and do not constitute a limitation to the scope of protection of the present invention. All other embodiments, which can be derived by those skilled in the art from the above-described embodiments without any creative effort, namely all modifications, equivalents, improvements and the like made within the spirit and principle of the present application, fall within the protection scope of the present invention claimed.

Claims (8)

1. A visual controllable curved nipple incision knife is characterized in that: comprises a flexible bending part (1), a flexible cutter bar (2), a handle operating part (3) and a cutter wire (4);

the flexible bending part (1) comprises a far-end head part (1-1), a middle section (1-2) and a near-end flexible bending section (1-3); the flexible bending part (1) is axially provided with a first camera channel (1-4) and a first instrument channel (1-5) which are communicated front and back, the flexible bending part (1) is provided with four first cutter wire channels (1-6) at the middle section (1-2) and the near-end flexible bending section (1-3), the part of each first cutter wire channel (1-6) at the near-end flexible bending section (1-3) is outwards provided with a groove form, and the four first cutter wire channels (1-6) are uniformly distributed along the circumferential direction of the near-end flexible bending section (1-3);

the flexible cutter bar (2) is axially provided with a second camera channel (2-1), a second instrument channel (2-2) and four second cutter wire channels (2-3) which are communicated with each other in the front-back direction, and the four second cutter wire channels (2-3) are uniformly distributed along the circumferential direction of the flexible cutter bar (2);

the handle operating part (3) comprises a handle shell (3-1), a first operating part and a second operating part which are arranged in an up-down symmetrical mode;

the handle shell (3-1) forms a cavity inside, the near end of the handle shell (3-1) is provided with two hollow tubular protruding parts, and the two tubular protruding parts respectively form a third camera channel (3-2) and a third instrument channel (3-3);

the first operation part comprises a thumb wheel (3-4), a rotating shaft system and an electrode column (3-5), wherein the rotating shaft system comprises a rotating shaft (3-6) and a winding wheel (3-7); the handle shell (3-1) is provided with a first rotating shaft mounting hole (3-1-1) and a second rotating shaft mounting hole (3-1-2) which are coaxial, the rotating shaft (3-6) is in a stepped shaft form and sequentially comprises a first shaft section, a second shaft section with the diameter larger than that of the first shaft section and a third shaft section with the diameter smaller than that of the second shaft section, the first shaft section sequentially penetrates through the first rotating shaft mounting hole (3-1-1) and the second rotating shaft mounting hole (3-1-2) and then is fixedly connected with the thumb wheel (3-4), a shaft shoulder of the second shaft section abuts against the outer side wall of the handle shell (3-1), and the third shaft section is fixedly connected with the electrode column (3-5); the reel (3-7) is arranged in the cavity and sleeved and clamped on the rotating shaft (3-6), and a double-layer track is arranged on the reel (3-7);

the near end of the flexible bending part (1) is fixedly connected with the far end of the flexible cutter bar (2), the near end of the flexible cutter bar (2) is fixedly connected with the far end of the handle operation part (3), the first camera channel (1-4), the second camera channel (2-1), the cavity and the third camera channel (3-2) are sequentially communicated, the first instrument channel (1-5), the second instrument channel (2-2), the cavity and the third instrument channel (3-3) are sequentially communicated, and the first cutter wire channel (1-6) and the second cutter wire channel (2-3) which correspond to the positions are sequentially communicated with the cavity;

the number of the cutter wires (4) is four, the far end of each cutter wire (4) is fixedly connected to the far end head (1-1), and the near end of each cutter wire (4) sequentially penetrates through the corresponding first cutter wire channel (1-6) and the corresponding second cutter wire channel (2-3) and then enters the cavity and is fixedly connected to the reel (3-7); the near end of one of the cutter wires in the pair of opposite cutter wires is wound and fixed on one track of the reel of the first operating part, the near end of the other cutter wire in the pair of opposite cutter wires is reversely wound and fixed on the other track of the reel of the first operating part, the near end of the other cutter wire in the pair of opposite cutter wires is wound and fixed on one track of the reel of the second operating part, and the near end of the other cutter wire in the pair of opposite cutter wires is reversely wound and fixed on the other track of the reel of the second operating part; the cutter wire (4) is an elastic metal wire and is provided with an insulating coating.

2. A visually controllable curved nipple cutting knife according to claim 1, characterized in that the proximal flexible curved section (1-3) is provided with cutting slots (1-7) spaced apart by an axial distance a on both sides of each of the first knife wire channels (1-6), the cutting slots (1-7) of two adjacent first knife wire channels (1-6) being axially spaced apart.

3. The visually controllable curved teat cutting knife according to claim 2, characterized in that the axial distance a gradually increases from the distal end to the proximal end of the flexible bend (1).

4. A visually controllable curved teat cutting knife according to claim 1, characterised in that the proximal flexible curved section (1-3) is provided with scale markings (1-8) on the outer surface.

5. Visually controllable curved-nipple cutting knife according to claim 4, characterized in that the graduation markings (1-8) are realized by means of laser code-spraying technology.

6. The visual controllable curved nipple incision knife according to claim 1, wherein said first operating portion further comprises an elastic limiting mechanism, said elastic limiting mechanism comprises a limiting shaft sleeve (3-8), a spring (3-9), and a top bead (3-10);

the handle shell (3-1) is internally provided with a limiting boss which extends inwards from the inner side wall, and the limiting boss is provided with a cylindrical groove (3-1-3) the axis of which is vertical to the axis of the rotating shaft (3-6);

the limiting shaft sleeve (3-8) is sleeved and clamped on the rotating shaft (3-6), and a plurality of hemispherical grooves (3-1-4) are uniformly formed in the outer surface of the limiting shaft sleeve (3-8) along the circumferential direction;

the springs (3-9) are arranged in the cylindrical grooves (3-1-3), and the top beads (3-10) are abutted against the springs (3-9) on one side and the hemispherical grooves (3-1-4) on the other side.

7. A visually controllable curved nipple incision knife according to claim 1, characterized in that the handle housing (3-1) is provided with an electrode column protective sheath (3-1-5) on the outside, into which electrode column protective sheath (3-1-5) the electrode column (3-5) protrudes.

8. The visual controllable curved nipple incision knife of any one of claims 1 to 7, wherein the corresponding knife wire is driven to move proximally by rotating the thumb wheel to form an arch knife; through cooperative control of the thumb wheel of the first operation part and the thumb wheel of the second operation part, the four knife wires (4) form two pairs to be matched with each other to drive the flexible bending part (1), and the direction of any space posture of the flexible bending part (1) is realized.

Images