阅读说明：本技术 一种经阴保护装置子宫旋切刀 (Transvaginal protection device uterus rotary cutter ) 是由 吴秀君 易红梅 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种经阴保护装置子宫旋切刀,其结构包括旋切刀、驱动套、压力柄、握手杆、吸力钮,旋切刀末端与驱动套内部嵌套连接,驱动套内部与压力柄顶端活动配合,压力柄前端与握手杆整体间隙配合,握手杆右表面与吸力钮末端嵌套连接,吸力钮内部与旋切刀内部间隙配合,旋切刀包括驱动座、刀片、刀护罩、导流吸管,驱动座表面与刀片末端嵌固连接,本发明通过驱动座两侧的粉碎座在共振座的辅助下进行触发,使得旋搅棒进行转动,配合支撑杆表面嵌套的击碎环在持续的转动下对落在驱动座四周的血块与肌瘤块进行粉碎,然后通过吸流口排出,有效解决血块凝固在驱动座两侧在刀片工作时发生刀片运行顿挫,避免对病患造成二次伤害问题发生。(The invention discloses a transvaginal protection device uterus rotary cutter, which structurally comprises a rotary cutter, a driving sleeve, a pressure handle, a holding rod and a suction button, wherein the tail end of the rotary cutter is nested and connected with the inside of the driving sleeve, the inside of the driving sleeve is movably matched with the top end of the pressure handle, the front end of the pressure handle is in overall clearance fit with the holding rod, the right surface of the holding rod is nested and connected with the tail end of the suction button, the inside of the suction button is in clearance fit with the inside of the rotary cutter, the rotary cutter comprises a driving seat, a blade shield and a flow guide suction pipe, the surface of the driving seat is fixedly connected with the tail end of the blade in an embedding way, the rotary cutter is triggered under the assistance of a resonance seat through crushing seats at the two sides of the driving seat, so that a rotary stirring rod rotates, a crushing ring nested on the surface of a supporting rod is matched to crush blood clots and myomata masses around the driving seat under continuous rotation, then the blood clots are discharged through a suction port, the problem that the blood clots are coagulated at the two sides of the driving seat and the blade runs and are hindered when the blade works is effectively solved, the problem of secondary damage to patients is avoided.)

1. The utility model provides a through cloudy protection device uterus rotary-cut knife, its structure includes rotary-cut knife (1), drive cover (2), pressure handle (3), holds handle pole (4), suction button (5), the rotary-cut knife is terminal with the inside nested connection of drive cover (2), drive cover (2) inside and pressure handle (3) top clearance fit, pressure handle (3) front end and the whole clearance fit of holding handle pole (4), hold handle pole (4) right surface and the terminal nested connection of suction button (5), inside and the inside clearance fit of rotary-cut knife (1) of suction button (5), its characterized in that:

rotary cutter (1) is including drive seat (11), blade (12), sword guard shield (13), water conservancy diversion straw (14), drive seat (11) surface is connected with the terminal embedded solid of blade (12), blade (12) right side and water conservancy diversion straw (14) top clearance fit, water conservancy diversion straw (14) whole and the inside nested connection of sword guard shield (13), sword guard shield (13) front end and drive seat (11) surface clearance fit.

2. The transvaginal protection device uterotome of claim 1, wherein: drive seat (11) including smashing seat (111), cover dado (112), inner groovy (113), inhale class mouth (114), smash the whole and the inside clearance fit of inner groovy (113) of seat (111), inner groovy (113) is whole and the inboard nested connection of cover dado (112), cover dado (112) front end and the whole clearance fit of smashing seat (111), smash seat (111) inboard and inhale class mouth (114) surface clearance fit.

3. The transvaginal protective device uterine rotary cutter as claimed in claim 2, wherein: crushing seat (111) is including rotating stirring rod (a 1), resonance seat (a 2), fixed wall (a 3), rotate stirring rod (a 1) terminal and resonance seat (a 2) inside clearance fit, resonance seat (a 2) bottom is connected with fixed wall (a 3) inner wall embedded solid, fixed wall (a 3) outer end and the whole clearance fit of rotating stirring rod (a 1).

4. A transvaginal protection device uterotome as claimed in claim 3, wherein: revolve stirring rod (a 1) and include silica gel cap (a 11), break ring (a 12), bracing piece (a 13), arc seat (a 14), inside and bracing piece (a 13) top end screwed connection of silica gel cap (a 11), bracing piece (a 13) surface and break ring (a 12) center nested connection, break ring (a 12) lower extreme and the whole clearance fit of arc seat (a 14), arc seat (a 14) top and bracing piece (a 13) terminal welded connection.

5. The transvaginal protection device uterotome of claim 1, wherein: the flow guide suction pipe (14) comprises an anti-sticking block (141), a circulation cavity (142), a fixed hoop (143) and a sliding rail (144), wherein the inside of the anti-sticking block (141) is in sliding fit with the inside of the sliding rail (144), the inner side of the sliding rail (144) is fixedly embedded with the inner wall of the circulation cavity (142), the outer wall of the circulation cavity (142) is integrally fixed with the fixed hoop (143) through bolts, and the inner side of the fixed hoop (143) is in clearance fit with the surface of the sliding rail (144).

6. The transvaginal protection device uterotome of claim 5, wherein: the anti-sticking block (141) comprises a swing bar table (b 1), an auxiliary wheel (b 2) and an embedded wheel (b 3), wherein the lower surface of the swing bar table (b 1) is fixedly embedded with the tail end of the auxiliary wheel (b 2), the inner side of the auxiliary wheel (b 2) is in clearance fit with the embedded wheel (b 3) integrally, and the top end of the embedded wheel (b 3) is fixedly embedded with the inner wall of the swing bar table (b 1).

7. The transvaginal protective device uterine rotary cutter as claimed in claim 6, wherein: the pendulum strip platform (b 1) is including swing strip (b 11), fixed strip (b 12), stage body piece (b 13), activity bolt (b 14), swing strip (b 11) bottom and activity bolt (b 14) whole articulated connection, activity bolt (b 14) is whole to be connected with fixed strip (b 12) surface nestification, fixed strip (b 12) lower extreme is connected with stage body piece (b 13) surface embeddedly, stage body piece (b 13) upper end and swing strip (b 11) clearance fit.

8. The transvaginal protective device uterine rotary cutter as claimed in claim 7, wherein: the swing strip (b 11) comprises a tension spring (c 1), a strip body (c 2), a guide groove (c 3) and a sliding pin (c 4), wherein the top end of the tension spring (c 1) is fixedly connected with the surface of the sliding pin (c 4), the surface of the sliding pin (c 4) is in sliding fit with the inside of the guide groove (c 3), the upper end of the guide groove (c 3) is in clearance fit with the tail end of the strip body (c 2), and the tail end of the strip body (c 2) is in clearance fit with the upper end of the tension spring (c 1).

Technical Field

The invention relates to the technical field of medical instruments, in particular to a transvaginal protection device uterus rotary cutter.

Background

The common gynecological operation is carried out when the hysteromyoma is treated, in order to protect the vagina, the patient suffering from the hysteromyoma needs to carry out the hysteromyoma excision operation in the uterus, the uterine rotary cutter is one of the instruments specially used for the operation, the hysteromyoma is excised through the rotary cutter after the instrument is placed at a designated position, and then the hysteromyoma is taken out of the body;

however, the prior art has the following defects: the utility model provides a current uterus rotary cutter through cloudy protection device, because the in-process of hysterectomy has the blood clot to fall around the drive seat of cutter lower extreme for the blood clot takes place to solidify in drive seat both sides, and the reduction appears in the holistic smoothness degree of blade when leading to the excision, so that uterus rotary cutter can appear ending and frustrating, thereby causes the secondary injury to the patient.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a transvaginal protection device uterus rotary cutter, and solves the problem that in the prior art, in the process of hysterectomy, blood clots can fall around a driving seat at the lower end of the cutter, so that the blood clots are coagulated on two sides of the driving seat, the whole smoothness of a blade is reduced during resection, and the uterus rotary cutter can be subjected to pause and contusion, so that secondary damage is caused to a patient.

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a through cloudy protection device uterus rotary-cut sword, its structure includes rotary-cut sword, drive cover, pressure handle, holding pole, suction button, the rotary-cut sword is terminal with the inside nested connection of drive cover, the inside and pressure handle top clearance fit of drive cover, pressure handle front end and the whole clearance fit of pole of shaking hands, hold pole right surface and the terminal nested connection of suction button, the inside and the inside clearance fit of rotary-cut sword of suction button, rotary-cut sword is including driving seat, blade, sword guard shield, water conservancy diversion straw, driving seat surface and the terminal embedded solid connection of blade, blade right side and water conservancy diversion straw top clearance fit, the whole and the inside nested connection of sword guard shield of water conservancy diversion straw, sword guard shield front end and driving seat surface clearance fit.

The invention is further improved, the driving seat comprises a crushing seat, a shield wall, an inner groove and a flow suction port, the whole crushing seat is movably matched with the inside of the inner groove, the whole inner groove is connected with the inner side of the shield wall in a nested manner, the front end of the shield wall is in clearance fit with the whole crushing seat, the inner side of the crushing seat is movably matched with the surface of the flow suction port, the crushing seat is distributed in the inner groove, and the inner sides of the two sides of the driving seat are in clearance fit with the flow suction port.

The invention is further improved, the crushing seat comprises a rotary stirring rod, a resonance seat and a fixed wall, the tail end of the rotary stirring rod is movably matched with the interior of the resonance seat, the bottom of the resonance seat is fixedly embedded and connected with the inner wall of the fixed wall, the outer end of the fixed wall is in clearance fit with the rotary stirring rod integrally, the rotary stirring rods are provided with three groups, each group consists of three rotary stirring rods, and the rotary stirring rods are matched with the tail end resonance seat to rotate so as to be fixed through the fixed wall.

The invention is further improved, the rotary stirring rod comprises a silica gel cap, a crushing ring, a support rod and an arc-shaped seat, the inner part of the silica gel cap is spirally connected with the top end of the support rod, the surface of the support rod is connected with the center of the crushing ring in a nested manner, the lower end of the crushing ring is in clearance fit with the arc-shaped seat integrally, the top of the arc-shaped seat is connected with the tail end of the support rod in a welded manner, the crushing ring is provided with five groups which are uniformly distributed on the surface of the support rod and are in nested connection with the surface of the support rod, and the upper end of the crushing ring is in clearance fit with the silica gel cap integrally.

The invention is further improved, the flow guide suction pipe comprises an anti-sticking block, a circulation cavity, a fixed hoop and a sliding rail, the interior of the anti-sticking block is in sliding fit with the interior of the sliding rail, the inner side of the sliding rail is fixedly connected with the inner wall of the circulation cavity, the outer wall of the circulation cavity is integrally fixed with the fixed hoop through bolts, the inner side of the fixed hoop is in clearance fit with the surface of the sliding rail, two groups of anti-sticking blocks are arranged, and two anti-sticking blocks are symmetrically distributed in the sliding rail and are in sliding fit with the sliding rail.

The anti-sticking block comprises a strip placing table, an auxiliary wheel and an embedded wheel, wherein the lower surface of the strip placing table is fixedly connected with the tail end of the auxiliary wheel in an embedded mode, the inner side of the auxiliary wheel is in clearance fit with the embedded wheel integrally, the top end of the embedded wheel is fixedly connected with the inner wall of the strip placing table in an embedded mode, the strip placing table is integrally semicircular, and the bottom surface of the strip placing table is fixedly connected with the auxiliary wheel and the top end of the embedded wheel respectively in an embedded mode.

The invention is further improved, the swing strip platform comprises a swing strip, a fixed strip, a platform body block and a movable bolt, the bottom of the swing strip is integrally hinged with the movable bolt, the movable bolt is integrally connected with the surface of the fixed strip in a nested manner, the lower end of the fixed strip is fixedly connected with the surface of the platform body block in a nested manner, the upper end of the platform body block is in clearance fit with the swing strip, five swing strips are arranged on the surface of the fixed strip in total and are uniformly distributed on the surface of the fixed strip, the swing strips are fixed in a nested manner through the movable bolt, and the lower end of the swing strip platform is in clearance fit with the platform body block.

The swing strip comprises a tension spring, a strip body, a guide groove and a sliding pin, wherein the top end of the tension spring is fixedly connected with the surface of the sliding pin in an embedded mode, the surface of the sliding pin is in sliding fit with the inside of the guide groove, the upper end of the guide groove is in clearance fit with the tail end of the strip body, the tail end of the strip body is in clearance fit with the upper end of the tension spring, and the sliding pin is integrally distributed inside the guide groove and forms clearance fit with the upper end strip body.

Advantageous effects

Compared with the prior art, the invention has the following beneficial effects;

1. according to the invention, the crushing seats on the two sides of the driving seat are triggered with the aid of the resonance seat, so that the rotary stirring rod rotates, the crushing rings nested on the surfaces of the supporting rods are matched to crush blood clots and myoma clots around the driving seat under continuous rotation, and then the blood clots are discharged through the suction port, thereby effectively solving the problem that the blood clots are coagulated on the two sides of the driving seat and the blades are in operation and the blade is in operation pause, and avoiding secondary damage to patients.

2. The strip swinging table slides left and right on the sliding rail under the assistance of the nesting wheels and the suction force, so that the swinging strip swings back and forth under the action of the suction force, continuously swings under the assistance of the movable bolt and the sliding pin, pushes blood clots and myoma masses in a circulation cavity, effectively accelerates the displacement of the blood clots and the myoma masses in the circulation cavity, and can stir the blood clots adhered to the cavity wall to be smoothly led out.

Drawings

Fig. 1 is a schematic structural view of a uterine rotary cutter of a transvaginal protection device.

Fig. 2 is a schematic view of the internal structure of the rotary cutter of the present invention.

Fig. 3 is a schematic front view of the driving seat of the present invention.

FIG. 4 is a schematic view of the inner structure of the seat for pulverization according to the present invention.

FIG. 5 is a schematic view of the internal structure of the stirring screw of the present invention.

FIG. 6 is a schematic view of the internal structure of the diversion pipette of the present invention.

Fig. 7 is a schematic view of the internal structure of the anti-sticking block of the present invention.

Fig. 8 is a schematic view of the internal structure of the bar-swinging table of the present invention.

Fig. 9 is a schematic view of the internal structure of the wobble strip of the present invention.

In the figure: a rotary cutter-1, a driving sleeve-2, a pressure handle-3, a handle rod-4, a suction button-5, a driving seat-11, a blade-12, a blade shield-13, a diversion suction pipe-14, a crushing seat-111, a shield wall-112, an inner groove-113, a suction port-114, a rotary stirring rod-a 1, a resonance seat-a 2, a fixed wall-a 3, a silica gel cap-a 11, a crushing ring-a 12, a support rod-a 13, an arc seat-a 14, an anti-sticking block-141, a circulation cavity-142, a fixed hoop-143, a sliding rail-144, a strip swinging table-b 1, an auxiliary wheel-b 2, a nesting wheel-b 3, a swinging strip-b 11, a fixed strip-b 12, a table body block-b 13, a movable bolt-b 14, a tension spring-c 1, a strip body-c 2, Guide groove-c 3, sliding pin-c 4.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

The invention is further described below with reference to the accompanying drawings:

example 1

As shown in figures 1 to 5:

its structure includes rotary cutter 1, drive sleeve 2, pressure handle 3, 4, the suction button 5 of shaking hands, rotary cutter end and the inside nested connection of drive sleeve 2, the inside 3 top clearance fit of pressure handle of drive sleeve 2, 3 front ends of pressure handle and the whole clearance fit of 4 poles of shaking hands, 4 right surfaces of pole of shaking hands and the terminal nested connection of 5 poles of suction button, the inside and 1 inside clearance fit of rotary cutter of suction button 5, rotary cutter 1 is including driving seat 11, blade 12, sword guard shield 13, water conservancy diversion straw 14, 11 surfaces of driving seat and the terminal embedded solid connection of 12 blades, the blade 12 right side and the 14 top clearance fit of water conservancy diversion straw, the whole and 13 inside nested connection of sword guard shield of water conservancy diversion straw 14, 13 front ends of sword guard shield and 11 surface clearance fits of driving seat.

Wherein, drive seat 11 includes and smashes seat 111, cover and protects wall 112, inner groovy 113, inhale class mouth 114, smash the whole and the inside clearance fit of inner groovy 113 of seat 111, the whole inside nested connection with cover and protect wall 112 of inner groovy 113, cover and protect the whole clearance fit of wall 112 front end and crushing seat 111, smash the inboard and inhale class mouth 114 surface clearance fit of seat 111, smash seat 111 and distribute inside inner groove 113, drive seat 11 both sides, inboard rather than inhaling class mouth 114 and carry out clearance fit, wherein inner groovy 113 is favorable to bearing the myoma that cuts to the myoma piece suction uterus that the cooperation inhaled class mouth 114 cut down inside.

The crushing seat 111 comprises a rotary stirring rod a1, a resonance seat a2 and a fixed wall a3, the tail end of the rotary stirring rod a1 is movably matched with the interior of the resonance seat a2, the bottom of the resonance seat a2 is fixedly connected with the inner wall of a fixed wall a3 in an embedding manner, the outer end of the fixed wall a3 is in clearance fit with the whole rotary stirring rod a1, three groups of rotary stirring rods a1 are arranged, each group consists of three rotary stirring rods a1, the rotary stirring rods are matched with the tail end resonance seat a2 to rotate, and accordingly the fixed wall a3 is used for fixing, wherein the rotary stirring rods a1 are beneficial to stirring blood clots falling at the front end, so that the blood clots are crushed, and the problem that the two sides of the driving seat 11 are prevented from being subjected to blade operation pause due to blood clot coagulation, and secondary injury to patients is solved.

The rotary stirring rod a1 comprises a silica gel cap a11, a smashing ring a12, a supporting rod a13 and an arc-shaped seat a14, the inside of the silica gel cap a11 is in threaded connection with the top end of the supporting rod a13, the surface of the supporting rod a13 is in nested connection with the center of the smashing ring a12, the lower end of the smashing ring a12 is in overall clearance fit with the arc-shaped seat a14, the top of the arc-shaped seat a14 is in welded connection with the tail end of the supporting rod a13, the smashing ring a12 is provided with five groups, the five groups are evenly distributed on the surface of the supporting rod a13, are in nested connection with the surface of the supporting rod a13, and the upper end of the silica gel cap a11 is in overall clearance fit, wherein the smashing ring a12 is beneficial to impact blood clots appearing when uterine fibroids are resected through the surface and are matched with a convex cone on the surface of the uterine fibroids in the displacement process of smashing, and the blood clots are prevented from being coagulated and interfering with the normal operation of the uterine rotary cutting knife.

The specific working principle is as follows:

according to the invention, after a doctor puts a rotary cutter 1 into a uterus, a pressure handle 3 is pressed through a handheld handle rod 4, so that the rotary cutter 1 in a hole of a driving sleeve 2 rotates, a driving seat 11 triggers a blade 12 in a rear cutter shield 13, the cutter shield 13 protects a normal part protected by vagina, the blade 12 is driven by the driving seat 11 to cut a hysteromyoma, a suction button 5 is matched with a diversion suction pipe 14 to suck blood clots and myoma masses out of equipment from a suction port 114, so that the blood clots and the myoma masses are supported by an inner groove 113 in a shield protective wall 112, in order to prevent the blood clots from being solidified on two sides of the driving seat 11, a crushing seat 111 drives an arc seat a14 through a resonance seat a2 during the operation of the equipment to enable a rotary stirring a1 at the front end of a3 to stir on two sides of the driving seat 11, and a11 on a supporting rod 13 is enabled to avoid causing damage to the equipment, meanwhile, the inner crushing rings a12 continuously rotate under the drive of the resonance seat a2 to crush the fallen blood clots, so that the problem that the blood clots are coagulated at two sides of the drive seat 11 and the blades 12 stop running when working is solved, and the problem of secondary damage to patients is avoided.

Example 2:

as shown in fig. 6 to 9:

the flow guide suction pipe 14 comprises anti-sticking blocks 141, a flow cavity 142, a fixing hoop 143 and a sliding rail 144, wherein the inside of each anti-sticking block 141 is in sliding fit with the inside of the sliding rail 144, the inner side of the sliding rail 144 is fixedly connected with the inner wall of the flow cavity 142, the outer wall of the flow cavity 142 is integrally fixed with the fixing hoop 143 through bolts, the inner side of the fixing hoop 143 is in clearance fit with the surface of the sliding rail 144, two groups of anti-sticking blocks 141 are arranged, and two groups of anti-sticking blocks are symmetrically distributed in the inside of the sliding rail 144 and are in sliding fit with the sliding rail 144, wherein the anti-sticking blocks 141 are beneficial to preventing the flow cavity 142 from being stuck on the cavity wall when the flow guide blood blocks and myomata blocks are discharged quickly.

The anti-sticking block 141 comprises a swing bar table b1, an auxiliary wheel b2 and an embedded wheel b3, the lower surface of the swing bar table b1 is fixedly connected with the tail end of the auxiliary wheel b2 in an embedded mode, the inner side of the auxiliary wheel b2 is in clearance fit with the embedded wheel b3 integrally, the top end of the embedded wheel b3 is fixedly connected with the inner wall of the swing bar table b1 in an embedded mode, the swing bar table b1 is integrally semicircular, and the bottom surface of the swing bar table b1 is fixedly connected with the top ends of the auxiliary wheel b2 and the embedded wheel b3 respectively in an embedded mode, wherein the auxiliary wheel b2 is beneficial to further movement of the auxiliary swing bar table b1, so that the swing bar table b1 is driven to move by suction force formed by matching pressure.

The swing strip table b1 comprises a swing strip b11, a fixed strip b12, a table body block b13 and a movable bolt b14, the bottom of the swing strip b11 is integrally hinged with the movable bolt b14, the movable bolt b14 is integrally connected with the surface of the fixed strip b12 in a nested manner, the lower end of the fixed strip b12 is fixedly embedded with the surface of the table body block b13, the upper end of the table body block b13 is in clearance fit with the swing strip b11, the swing strips b11 are totally five in number and are uniformly distributed on the surface of the fixed strip b12, the movable bolt b14 is used for nesting and fixing, and the lower end of the swing strip b11 is in clearance fit with the table body block b13, wherein the swing strip b11 is beneficial to pushing wave and further swings under the driving of pressure, so that the displacement of an internal blood block and a muscle tumor block is accelerated, and the swing strip adhered to be smoothly led out.

The swinging bar b11 comprises a tension spring c1, a bar body c2, a guide groove c3 and a sliding pin c4, the top end of the tension spring c1 is fixedly connected with the surface of the sliding pin c4, the surface of the sliding pin c4 is in sliding fit with the inside of the guide groove c3, the upper end of the guide groove c3 is in clearance fit with the tail end of the bar body c2, the tail end of the bar body c2 is in clearance fit with the upper end of the tension spring c1, the sliding pin c4 is integrally distributed inside the guide groove c3, and the auxiliary bar body c2 is restored after being displaced under the fit of the sliding pin c4 through clearance fit with the upper bar body c2, wherein the tension spring c1 facilitates the auxiliary bar body c2 to restore after being matched with the sliding pin c4, so that the left-right swinging effect is achieved.

The specific working principle is as follows:

the invention is driven by the sliding rail 144 through the guiding suction pipe 14 matching the inner side anti-sticking block 141 under the fixing of the fixing hoop 143, when the suction button 5 is triggered, the nested wheel b3 is influenced by the suction force on the sliding rail 144 to match the auxiliary wheel b2 to further drive the swing strip table b1 to displace, so that the fixed strip b12 at the upper end of the table body b13 is matched with the movable bolt b14 to hinge the swing strip b11, so that the strip body c2 swings back and forth on the guide groove a3 under the matching of the sliding pin c4 and the pull spring c1 after receiving the suction force, further pushes the blood block and the myoma block circulating in the circulating cavity 142, and prevents the blood block and the myoma block from sticking on the cavity wall, the invention makes the swing strip b1 slide left and right on the sliding rail 144 under the assistance of the nested wheel b3 and the suction force, so that the swing strip b11 swings back and forth under the action of the suction force, thereby making the movable bolt b14 swing back and forth under the auxiliary pin 4 continuously, promote blood clot and myoma piece in its circulation chamber 142, the effectual displacement of accelerating inside blood clot and myoma piece can also be stirred the gluing on the chamber wall simultaneously, makes it derive smoothly.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein; any reference sign in a claim should not be construed as limiting the claim concerned.