CN114305548A

CN114305548A - Traction adjusting device of vertebral plate drag hook

Info

Publication number: CN114305548A
Application number: CN202210046948.5A
Authority: CN
Inventors: 王申林; 张炎; 张超
Original assignee: Zhumadian Hospital Of Traditional Chinese Medicine
Current assignee: Zhumadian Hospital Of Traditional Chinese Medicine
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-04-12

Abstract

The invention relates to a traction adjusting device of a vertebral plate drag hook, which effectively solves the problems that the existing operation drag hook is inconvenient to operate and use and cannot realize a certain safety protection effect on a patient; the technical scheme comprises the following steps: the device can accomplish the excision work of incised tractive and vertebral plate under the condition of one-man operation, has reduced medical personnel's quantity promptly and also has made going on of operation more accurate, safe, reliable, and the device is at the outside tractive in-process to the incision in addition, still can realize the safety protection measure of certain degree, and indirect supplementary doctor judges the distance between drag hook and the transverse process to avoid breaking the transverse process of easy fracture because of outside tractive transition mistake, cause the unnecessary damage.

Description

Traction adjusting device of vertebral plate drag hook

Technical Field

The invention relates to the technical field of medical appliances, in particular to a traction adjusting device of a vertebral plate drag hook.

Background

The vertebral plate draw hook is a medical apparatus used in lumbar vertebra surgery, the purpose is to pull open the tissue to expose the surgery field, can realize the skin, subcutaneous muscular tissue outside the incision to prop open through the draw hook, in order to facilitate doctor's observation, operation to the deep position, the vertebral plate draw hook is applied to the reduced pressure surgery of laminectomy extensively, mainly mean to excise spinous process and vertebral arch lamina of vertebra in order to reduce the oppression to spinal cord in the vertebral hole, thus relieve the state of illness of the patient;

however, in the existing laminectomy, a doctor needs to hold the draw hook by hand to draw tissues at the incision, and needs to observe the exposure condition of the spinous process and the vertebral lamina of a patient at any time to perform the laminectomy, and as the traction draw hook occupies the hands of the doctor, the subsequent laminectomy process is affected, a special medical handheld draw hook is needed to complete the traction process under normal conditions, but two people occupy the operation space during operation, and medical care in charge of the traction of the draw hook needs to listen to the command of a main doctor to control the traction degree of the draw hook, and if the matching process of the two people is wrong, secondary injury is easily caused to the wound of the patient;

when the laminectomy is performed, the spinal fusion is usually performed, that is, the connection strength of the spine is increased by placing nails at the position of the vertebral arch plate close to the transverse process and placing supporting metal, and because the nail placing position is farther away from the central axis of the spine relative to the laminectomy position, the incision is further pulled to one side through a draw hook to increase the operation space, and because the draw hook is already close to the transverse process at the time, the draw hook continues to be pulled to the outside, the situation that the draw hook touches the transverse process and breaks the transverse process (the transverse process is longer, flat and thin and easy to fracture) easily occurs, and unnecessary pain is brought to the patient;

in view of the above, we provide a laminectomy retractor adjustment device to solve the above problems.

Disclosure of Invention

In order to solve the above problems, the invention provides a vertebral plate drag hook traction adjusting device, which can complete the traction of an incision and the excision of a vertebral plate under the condition of single-person operation, namely, the number of medical personnel is reduced, so that the operation is more accurate, safe and reliable.

The vertebral plate drag hook traction adjusting device comprises an adjusting frame and is characterized in that air cylinders are arranged on two longitudinal sides of the adjusting frame respectively, drag hooks matched with the air cylinders are arranged on the adjusting frame in a longitudinal sliding mode, the drag hooks are connected with valve plates which are coaxially and slidably installed in the air cylinders and elastically connected with the air cylinders, one opposite sides of the two air cylinders are jointly connected with one-way valves arranged on the adjusting frame, the one-way valves are communicated with a flow divider, one opposite sides of the two air cylinders are communicated with the flow divider through air passages respectively, and the flow divider is communicated with a gas generating device;

the air flue and the flow divider are matched to meet the following requirements: when gas enters the gas cylinders through the one-way valve, the gas channel is in a conducting state with the outside, and when the gas enters one of the gas cylinders through the gas channel, the gas channel is in a closed state.

The beneficial effects of the technical scheme are as follows:

(1) the device can complete the traction of the incision and the excision of the vertebral plate under the condition of single operation, thereby reducing the number of medical care personnel and avoiding the condition that the error is easy to generate due to the matching operation of two people, and leading the operation to be more accurate, safe and reliable;

(2) when the laminectomy is completed, in the subsequent spine fusion operation and the process of further opening the incision, the device can also realize a certain degree of safety protection measures in the process of drawing the incision outwards, and indirectly assists a doctor to judge the distance between the draw hook and the transverse process, thereby avoiding the situation that the transverse process which is easy to fracture is mistakenly broken due to the drawing transition towards the outside to cause unnecessary damage.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic bottom view of the present invention;

FIG. 3 is a schematic view of the fitting relationship between the stepped pipe and the protruding part according to the present invention;

FIG. 4 is an enlarged view of the structure at A of the present invention;

FIG. 5 is a cross-sectional view of the stepped pipe according to the present invention;

FIG. 6 is a schematic view of the fitting relationship between the through hole and the stepped pipe according to the present invention;

FIG. 7 is a schematic view of the internal structure of the cylinder of the present invention after being sectioned;

FIG. 8 is a schematic view of a diverter according to the present invention;

FIG. 9 is a schematic view showing the relationship between the retractor, the air bag and the arc frame;

FIG. 10 is a schematic view of the relationship between the stepped air holes and the one-way balls;

FIG. 11 is a schematic cross-sectional view of a gas generator according to the present invention;

FIG. 12 is a schematic view of another embodiment of the gas generator of the present invention;

FIG. 13 is a schematic view of a human spine structure;

FIG. 14 is a schematic view of a laminectomy and stapling line.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which reference is made to the accompanying drawings.

Embodiment 1, this embodiment provides a vertebral plate drag hook pulling and adjusting device, as shown in fig. 1, including an adjusting rack 1, when performing specific use, the adjusting rack 1 can be used together with a mounting rack, the mounting rack can slide relative to the extending direction of the bed body, and can adjust its height in the vertical direction, the medical staff can control the position of the adjusting rack 1 relative to the incision part of the patient by moving the mounting rack and adjusting its height (which can be achieved by a telescopic rod) (thereby achieving moving the device to the incision part of the patient and achieving control by controlling the telescopic rod), the specific structure of the mounting rack (which is prior art and can be easily achieved by those skilled in the art) is not described herein too much, and the improvement of this scheme over the prior art is as follows:

as shown in the attached drawing 1, the air cylinders 2 are respectively arranged at two longitudinal sides of the adjusting frame 1, the adjusting frame 1 is longitudinally slidably provided with a draw hook 3 matched with the air cylinders 2, as shown in the attached drawing 7, the draw hook 3 is connected with a valve plate 4 which is coaxially slidably arranged in the air cylinders 2 and is elastically connected with the air cylinders (the valve plate 4 is closely matched and contacted with the inner wall of the air cylinders 2 and is provided with a sealing rubber ring so as to ensure air tightness), as shown in the attached drawing 1, one-way valves arranged on the adjusting frame 1 are commonly connected at one opposite sides of the two air cylinders 2, the one-way valves are communicated with a flow divider 6, the flow divider 6 is connected with a gas generating device, the opposite sides of the two air cylinders 2 are respectively communicated with gas passages 5, the two gas passages 5 are respectively communicated with the flow divider 6, and the draw hooks 3 at two longitudinal sides are close to each other (basically in a contact fit state) at the beginning;

then the doctor performs an incision operation on the patient to be operated (i.e. cuts an opening along the extending direction of the spine of the patient), then the doctor moves the adjusting frame 1 to the incision position through the mounting frame and places the pulling hooks 3 at the two longitudinal sides right above the incision, then the doctor controls the adjusting frame 1 to descend (by controlling the telescopic rod) and makes the bottom ends of the pulling hooks 3 at the two longitudinal sides firstly inserted into the incision, then the doctor generates a certain amount of gas through the gas generating device and makes the gas enter the two gas cylinders 2 through the splitter 6 and the one-way valve (at this time, the gas enters the gas cylinders 2 through the gas cylinders 2 near the ends of the pulling hooks 3), as shown in figure 7, along with the entering of the gas, the valve plate 4 is forced to move towards the direction far away from the pulling hooks 3 (so that the springs connected between the valve plate 4 and the gas cylinders 2 are compressed), and then the pulling hooks 3 corresponding to move synchronously, make two drag hooks 3 respectively towards the direction removal of keeping away from each other (thereby realize the effect of outwards strutting the incision position), annotate: when the doctor performs incision operation, the doctor does not cut the incision deeply, but cuts and stretches the skin and subcutaneous tissues of the incised part outwards slightly through the draw hook 3 (the doctor can control the amount of gas entering the gas cylinder 2 through the gas generating device, so that the moving distance of the valve plate 4 in the gas cylinder 2 is controlled, the moving amplitude of the draw hook 3 is further controlled, and the size of the stretched incision is controlled), and then the incision is continued until the spinous processes of the patient are exposed;

when the air enters the air cylinder 2 and forces the valve plate 4 to move in the air cylinder 2, the air in the air cylinder 2 at the left side of the valve plate 4 shown in figure 7 is discharged outwards through the air passage 5 (when the air generated by the air generating device enters the air cylinder 2 at the right side of the valve plate 4 through the flow divider 6 and the one-way valve, the air passage 5 is in a state of being communicated with the outside, at this time, the air in the space at the left side of the valve plate 4 can be discharged to the outside environment through the air passage 5 under the extrusion of the valve plate 4), the above process is repeated (after the doctor opens the incision outwards to a certain extent through the air generating device, the incision after opening is cut again until the cutting depth reaches the part where the spinous processes are located and the spinous processes are exposed), and then the doctor can perform laminectomy, as shown in figure 13, which is a schematic view from top to the bottom, fig. 13 shows the hollow white part with subcutaneous muscle tissue (not shown), as shown in fig. 14, a resection route for the doctor to resect the vertebral plate (the resected vertebral plate is Y-shaped (at this time, the spinous process and part of the vertebral plate are resected together), so as to relieve the compression on the spinal cord in the vertebral hole, recover the vertebral hole space, and relieve the condition of the patient);

after the laminectomy is completed by the doctor, the spinal fusion needs to be performed, that is, the screw is driven into the pedicle along the screw-in line as shown in fig. 14, so as to achieve the effect of strengthening and connecting the two adjacent affected joints (the screw is inserted into the pedicle and the metal support is placed to match with the screw, so as to achieve the effect of strengthening and connecting the two adjacent affected joints, which is not described in the prior art), because the screw-in line of the screw is located between the resection line and the transverse process (the screw-in line of the screw is farther away from the central axis of the spine than the resection line of the vertebral plate), at this time, if the screw is to be inserted, the surgical incision needs to be further stretched outwards to expose the screw-in line to the vision of the doctor (since the screw needs to be inserted on both sides, the screw needs to be operated on one side when the screw is inserted, after the screws on one side are placed and the metal support is placed, the other side can be switched to, and the screws on the other side are placed and the metal support is placed);

after the laminectomy is completed by the doctor, the distance between the two draw hooks 3 and the central axis of the spine of the patient is the same (in order to make the laminectomy proceed smoothly, the range of the surgical incision expanded by the two draw hooks 3 is already large), in the subsequent spine fusion (i.e. the process of inserting the screw), one side of the incision needs to be further drawn outwards firstly, so that the nailing route is exposed in the visual field of the doctor (providing the surgical operation space for the insertion of the screw), at this time, the doctor only needs to control the flow divider 6 and make the gas generated by the gas generating device flow to one of the air passages 5 through the flow divider 6 and deliver the gas to the space of the air cylinder 2 at the left side of the valve plate 4 through the air passage 5 (when the gas enters the air cylinder 2 through the air passage 5, the air passage 5 is in a non-conducting state with the outside, and the air passage 5 communicated with the other air cylinder 2 is in a conducting state with the outside), as shown in figure 7, along with the gas entering into the space of the cylinder 2 at the left side of the valve plate 4 through the gas passage 5, the valve plate 4 is forced to move in the cylinder 2 in the opposite direction (at this time, the draw hook 3 corresponding to the valve plate 4 will move towards the direction close to the central axis of the spine simultaneously, and since the screw inserting operation is not performed at this time, even if the draw hook 3 moves towards the direction close to the central axis of the spine and the drawing degree of the incision at this side is reduced, no influence is generated), so that the gas in the space at the right side of the valve plate 4 enters into the other cylinder 2 and the valve plate 4 in the other cylinder 2 is forced to move continuously away from the central axis of the spine of the patient (thereby realizing that the draw hook 3 corresponding to the valve plate 4 in the other cylinder 2 moves towards the direction away from the central axis of the spine, and at this time, the gas in the space at the right side of the valve plate 4 of the cylinder 2 is discharged to the external environment through the gas passage 5 connected with the valve plate 4), thereby realizing the effect of further pulling the surgical incision to one side (providing a surgical operation space for the insertion of the side screw);

after the screw is inserted into one side and the metal support is placed, the screw insertion and the metal support placement can be performed on the other side, at this time, the doctor can move the draw hook 3 corresponding to the side which is not yet subjected to the screw insertion operation in the direction away from the central axis of the spine and further draw the surgical incision on the side outwards by controlling the flow divider 6 and making the gas flow to the air cylinder 2 corresponding to the side which is subjected to the screw insertion operation through the flow divider 6 and the air passage 5 (the subsequent process is as above, not much described), until the screw insertion and the metal support placement operation on the two sides are completed, in order to withdraw the draw hook 3 from the surgical incision after the completion of the operation, the openable switch valves (not shown) can be respectively arranged at the two end parts of the air cylinder 2, when the two switch valves are opened, the valve plate 4 positioned in the air cylinder 2 moves towards the initial position under the action of the spring connected with the switch valves, until the reset is finished (in the process that the valve plate 4 moves in the gas cylinder 2, gas enters and flows out through the switch valves at the two end parts of the gas cylinder 2);

note: when the spine fusion is performed, when the air enters the air cylinder 2 at one side through the air passage 5, the valve plate 4 in the air cylinder 2 can move towards the direction close to the central axis of the spine and the valve plate 4 in the other air cylinder 2 can move towards the direction far from the central axis of the spine, so that the effect of continuously pulling the operation incision at the other side outwards is realized, because the operation incision is already spread to a large extent when the laminectomy is performed (if the operation incision is continuously pulled towards one side, the tail end of the operation incision is easy to tear), in the scheme of the application, the above situation can be well avoided, and the cooperation of the two air cylinders 2, the air passage 5 and the flow divider 6 can realize that when the operation incision is continuously pulled outwards by the draw hook 3 at one side (namely, the operation incision moves towards the direction far from the central axis of the spine), the draw hook 3 at the other side can synchronously move towards the direction close to the central axis of the spine, the distraction degree of the surgical incision on the opposite side is reduced, so that a margin is provided for the other side of the surgical incision to be continuously pulled outwards (the whole distraction range of the surgical incision is basically consistent with the distraction range of the laminectomy operation in the prior art), and the condition that the tail end of the incision is torn due to the fact that the surgical incision is required to be continuously pulled outwards when the spinal fusion operation is performed is avoided.

Embodiment 2, based on embodiment 1, as shown in fig. 1, the air passage 5 includes an S-tube 7 connected between the air cylinder 2 and the flow divider 6, and two protrusions 8 are spaced apart from each other on the S-tube 7, as shown in fig. 3, the inner diameter of the protrusion 8 is greater than the inner diameter of the air tube, and a stepped tube 9 is axially slidably mounted in the two protrusions 8 (the stepped tube 9 and one of the protrusions 8 is connected with a spring), two ends of the stepped tube 9 are respectively disposed in the two protrusions 8 (as shown in fig. 5) and are in sliding fit contact with the inner wall of the protrusion 8, a first valve ball 10 is axially slidably mounted in the larger diameter end of the stepped tube 9, and a spring (no reference numeral is shown in the figure) is connected between the first valve ball 10 and the stepped tube 9, an arc-shaped surface of the first valve ball 10 abuts against the smaller diameter end of the stepped tube 9 under the action of the spring, as shown in fig. 6, a through hole 30 is provided on the protrusion 8 matched with the larger diameter end of the stepped tube 9 and is connected with the outside (the through hole 30 is connected with the through hole 30 A manual valve 12 for controlling the communication between the through hole 30 and the outside by screwing the manual valve 12);

as shown in fig. 1, when the doctor sends the gas generated by the gas generating device to the two gas cylinders 2 through the diverter 6 and the one-way valve, the gas forces the valve plate 4 to move in the corresponding gas cylinder 2 and in the direction away from the central axis of the spine of the patient, so that the gas initially in the space of the valve plate 4 on the side away from the central axis of the spine is squeezed into the S-tube 7 connected to the gas cylinder 2, as shown in fig. 5, the gas entering the S-tube firstly enters the protrusion 8 and squeezes the stepped tube 9 (due to the obstruction of the first valve ball 10, the gas pressure in the protrusion 8 increases with the continuous gas entering), so that the stepped tube 9 moves in the direction of the spring connected with the protrusion, as shown in fig. 6, along with the movement of the stepped tube 9, so that the through hole 30 formed on the protrusion 8 is no longer blocked by the part with the larger diameter of the stepped tube 9 (initially, when the stepped pipe 9 is in a natural state, the through hole 30 arranged on the protruding part 8 is shielded by the part with the larger diameter of the stepped pipe 9), at this time, the gas entering the S pipe 7 from the gas cylinder 2 is discharged outwards through the through hole 30 and the manual control valve 12 (so that the valve plate 4 can move in the gas cylinder 2 towards the direction far away from the central axis of the spine of the patient, and the effect of pulling the surgical incision outwards is further completed);

in the process, the gas generated by the gas generating device is respectively conveyed into the two gas cylinders 2 through the flow divider 6 and the one-way valve, so that the draw hooks 3 positioned at the two sides are driven to move towards the direction away from each other, and the incisions at the two sides of the operation are synchronously pulled outwards from the central axis of the spinal column.

Embodiment 3, on the basis of embodiment 2, as shown in fig. 1, opposite sides of two gas cylinders 2 are respectively communicated with a gas inlet pipe 13, the two gas inlet pipes 13 are communicated with a transfer chamber 14 (as shown in fig. 10), the two gas inlet pipes 13 are communicated with each other through the transfer chamber 14, the transfer chamber 14 is communicated with a flow divider 6 through a stepped gas hole 15, as shown in fig. 10, a one-way ball 16 axially slides in the stepped gas hole 15, a spring is connected between the one-way ball 16 and the stepped gas hole 15, an arc surface of the one-way ball 16 is abutted against one end with a smaller diameter of the stepped gas hole 15 (so that gas can only flow from the flow divider 6 to the transfer chamber 14 but cannot flow reversely) under the action of the spring, when a doctor controls the flow divider 6 and communicates with the transfer ball, gas generated by a gas generating device firstly enters one end with the smaller diameter of the stepped gas hole 15 and increases the gas pressure at one end with the smaller diameter of the stepped gas hole 15, so that the air pressure overcomes the acting force of the spring on the one-way ball 16 and forces the one-way ball 16 to move towards the direction far away from the flow divider 6 (the diameter of the one-way ball 16 is larger than the inner diameter of the smaller end of the step air hole 15 and smaller than the inner diameter of the larger end of the step air hole 15), when the arc-shaped surface of the one-way ball 16 does not abut against the smaller end of the step air hole 15, the flow divider 6 is communicated with the transfer cavity 14, and at the moment, the air enters the transfer cavity 14 through the step air hole 15 and respectively enters the two air cylinders 2 through the two air inlet pipes 13.

Embodiment 4, on the basis of embodiment 3, as shown in fig. 8, the flow divider 6 includes a circular cavity 17 communicating with the S-tube 7 and the stepped air hole 15, and a flow dividing circular plate 18 is coaxially rotated in the circular cavity 17, the flow dividing plate is integrally provided with a vertically extending converging tube 19 through its axis (the converging tube 19 is communicated with the gas generating device through a rotating joint), and a friction damping pad is provided at a rotating installation position of the flow dividing circular plate 18 and the circular cavity 17 (increasing the friction resistance between the flow dividing circular plate 18 and the circular cavity 17, so that the flow dividing circular plate 18 cannot easily rotate without being subjected to a large external force), a flow dividing channel 20 is radially provided in the flow dividing circular plate 18 and the flow dividing channel 20 is communicated with the converging tube 19, and a doctor controls the flow dividing channel 20 to correspond to the stepped air hole 15 (to communicate with the middle cavity 14) or to correspond to the two S-tubes 7 (to communicate with the S-tubes 7) by rotating the converging tube 19, thereby controlling the flow direction of the gas;

when the laminectomy is completed and the spinal fusion operation needs to be performed (at this time, the manual valve 12 needs to be closed first), at this time, the one-side draw hook 3 needs to be controlled to further draw the operation incision outwards so as to expose the screw nailing route in the visual field of the doctor (the screw nailing route is further away from the central axis of the spinal column compared with the laminectomy route, so that the operation incision needs to be drawn outwards to a greater extent), at this time, the doctor controls the diversion circular plate 18 to rotate and enable the diversion channel 20 to be communicated with one of the S tubes 7, at this time, the gas generated by the gas generating device enters the S tube 7 through the converging tube 19 and the diversion channel 20, as shown in fig. 5, the gas entering the S tube 7 firstly enters the protruding part 8 connected with the spring with the stepped tube 9 and then enters the inside of the end with the smaller diameter of the stepped tube 9, and the gas pressure inside the stepped tube 9 is gradually increased along with the continuous entering of the gas, so as to overcome the elastic force of the spring connected to the first valve ball 10 and to make the first valve ball 10 move along the stepped pipe 9 and towards the direction away from the end with the smaller diameter, thereby achieving the effect of conducting the end with the smaller diameter of the stepped pipe 9 with the other protruding part 8 (setting the elastic coefficient of the spring connecting the stepped pipe 9 and the protruding part 8 with the diameter larger than the elastic coefficient of the spring connecting the first valve ball 10 and the stepped pipe 9), as shown in fig. 6, since the through hole 30 provided on the protruding part 8 is shielded by the end with the larger diameter of the stepped pipe 9, the gas directly flows into the gas cylinder 2 through the S-pipe 7;

as shown in figure 8, the gas entering the cylinder 2 forces the valve plate 4 to move towards the direction close to the central axis of the patient's spine, and along with the movement of the valve plate 4, the gas entering the space of the cylinder 2 on the right side of the valve plate 4 is pushed into the transfer chamber 14 through the gas inlet pipe 13 communicated with the gas inlet pipe, as shown in figure 10, due to the arrangement of the step gas hole 15 and the one-way ball 16, the gas entering the transfer chamber 14 flows into the other cylinder 2 through the diameter of the other gas inlet pipe 13, and the valve plate 4 in the other cylinder 2 is forced to move continuously towards the direction far away from the central axis of the patient's spine (and then the corresponding draw hook 3 is driven to move synchronously towards the direction far away from the central axis of the spine), so as to further draw the surgical incision on the side corresponding to the cylinder 2 outwards, thereby exposing the screw driving route to the doctor's field (at this time, the draw hook 3 will be exposed from the patient's skin, The reaction force of the subcutaneous muscle tissue and the gas in the gas cylinder 2 will generate a squeezing force, so as to avoid the situation that the stepped tube 9 moves towards the direction close to the central axis of the spine of the patient under the action of the gas pressure and the gas is discharged outwards through the through hole 30 arranged on the protrusion part 8 due to the overlarge squeezing force, and the manual valve 12 is closed before the spine fusion operation is performed, and similarly, when the screw insertion and the metal support placement are performed on the other side, the shunt 6 and the other S tube 7 are only needed to be repeated, and the process is not described in detail herein.

Embodiment 5, on the basis of embodiment 3, as shown in fig. 7 and 8, an arc frame 21 is disposed at one end of a valve plate 4 outside an air cylinder 2, and a retractor 3 is respectively fixed at two ends of the arc frame 21 (the arc frame 21 is disposed such that a doctor can provide a receiving space for using surgical instruments and surgical operations during subsequent surgical operations, and when the surgical incision is opened, the doctor can perform laminectomy and subsequent spinal fusion surgical operations through a channel formed by the two arc frames 21), as shown in fig. 2, a corner portion 22 is disposed at the bottom of the retractor 3, the retractor 3 disposed at two sides and matched with each other forms an inverted Y shape, and when the two matched retractor 3 are inserted into the surgical incision and the surgical incision is performed, the interior of the surgical incision presents a shape with a small upper opening and a large lower opening (the skin surface of a human body is hard, the muscle tissue located at the lower part of the skin surface is soft and is easy to be opened), thereby providing a larger internal operation space for the doctor at the position below the skin under the condition of ensuring a smaller operation incision;

as shown in fig. 8, an air bag 23 is provided inside the corner 22 of the retractor 3 (the air bag 23 is in a deflated state at the beginning, i.e. attached to the corner 22 of the bottom of the retractor 3) and the air bag 23 is communicated with a sensing device provided in the air cylinder 2, when the valve plate 4 moves in the air cylinder 2 and drives the retractor 3 to move away from the central axis of the spine of the patient, the sensing device synchronously inflates the air bag 23 and makes the air bag 23 expand gradually, when the retractor 3 is inserted into the incision and moves away from the central axis of the spine, the air bag 23 also expands gradually, so as to further increase the expansion range of the subcutaneous muscle tissue (the muscle tissue below the skin surface is soft and easy to expand), and through the soft air bag 23 directly contacting with the subcutaneous muscle tissue and expanding it to the outside (at this time, the air bag 23 also receives a reaction force from the subcutaneous muscle tissue, i.e., the balloon 23 is also subjected to resistance from the subcutaneous muscle tissue during inflation), damage to the subcutaneous muscle tissue is also mitigated;

when the doctor finishes laminectomy and performs spinal fusion, one side of the surgical incision needs to be further pulled outwards, at this time, the doctor adjusts the air inlet direction and enables the draw hook 3 on one side to continue moving in the direction away from the central axis of the spinal column (the draw hook 3 on the other side moves in the direction close to the central axis of the spinal column), the air bag 23 on the draw hook 3 moving in the direction away from the central axis of the spinal column continues expanding and receives increasingly larger resistance from subcutaneous muscular tissue (so as to further expand the subcutaneous muscular tissue on the side outwards), and the air bag 23 on the draw hook 3 moving in the direction close to the central axis of the spinal column synchronously starts contracting, as shown in figure 14, when laminectomy is performed, the draw hook 3 is positioned between the laminectomy line and the transverse process (at this time, the screw feeding line is just in the range), in order to perform the laminectomy and complete the screw setting operation, at this time, the drag hook 3 needs to move continuously away from the central axis of the spinal column (the more the drag hook 3 moves to the outer side, the larger the expansion degree of the corresponding air bag 23 is, the larger the degree of the opening of the subcutaneous musculature of the side is, and the larger the resistance force is applied to the air bag 23), if the air bag 23 arranged at the inner side of the corner part 22 of the drag hook 3 just touches the transverse process in the process that the drag hook 3 moves continuously to the outer side, the air bag 23 is squeezed (the transverse process is hard relative to the subcutaneous musculature) and the air bag 23 is blocked by the transverse process and cannot expand continuously, and the air bag 23 is further squeezed along with the continuous outward movement of the drag hook 3, the air pressure inside the air bag 23 starts to increase suddenly, when the sensing device detects that the air pressure inside the air bag 23 increases to a certain degree, the valve corresponding to the air bag 23 is controlled to be closed, and the air inlet pipe 13 corresponding to the air bag 23 is closed (at this time, the air cannot enter the air pipe 2 continuously), finally, the side draw hook 3 can not be drawn outwards continuously (the effect of protecting the transverse process of the patient is realized);

in this embodiment, the setting of the air bag 23 can avoid the drag hook 3 from directly contacting with the transverse process in the process of pulling towards the outside, and before the drag hook 3 touches the transverse process (the set air bag 23 touches the transverse process before the drag hook 3, because of the soft characteristic of the air bag 23, the transverse process cannot be damaged), and when the air bag 23 is extruded to a certain extent, the sensing device controls the valve arranged on the air inlet pipe 13 to be closed, so that the drag hook 3 can be prevented from continuing to pull towards the outside in time (because the drag hook 3 pulls the incision towards the outside, the transverse process is still covered by the muscle tissue at this time, the doctor cannot see the specific position of the transverse process, and can only judge according to personal experience, so that the operation has a certain risk), when the doctor cannot clearly know the specific position of the transverse process, the doctor assists the doctor to stop the continuous pulling of the drag hook 3 in time, so that the operation is safer to perform, And (4) reliability.

Embodiment 6, on the basis of embodiment 5, as shown in fig. 7, the sensing device includes a sensing cylinder 24 coaxially disposed in the air cylinder 2 and fixedly mounted therewith, a sensing plate 25 elastically connected therewith is coaxially slid in the sensing cylinder 24 (the sensing plate 25 and the sensing cylinder 24 are connected with a spring and the spring is not shown in the figure), the sensing plate 25 is driven by the corresponding valve plate 4, one end of the sensing cylinder 24 facing the corresponding valve plate 4 is provided with a vent pipe 39 and is communicated with the external atmosphere, one end of the sensing cylinder 24 away from the corresponding valve plate 4 is communicated with the corresponding air bag 23 through a pipe (the pipe is not numbered in the figure, as shown in fig. 8, since the arc frame 21 is movable relative to the air cylinder 2, the pipe is communicated with the two air bags 23 corresponding thereto through a hose, the hose is not shown in the figure and the hose should be a pipe having a certain pressure resistance degree), when gas is respectively conveyed into the two gas cylinders 2 through the transfer cavity 14 and the gas inlet pipe 13, the valve plate 4 is forced to move in the gas cylinders 2, and then the sensing plate 25 is synchronously driven to move in the sensing cylinder 24, so that the gas in the space of the sensing plate 25, which is far away from the corresponding valve plate 4, is extruded into the corresponding gas bag 23 (at the moment, the external atmospheric environment gas flows into the space of the sensing plate 25, which is facing the corresponding valve plate 4, through the gas outlet pipe 39), and the gas bag 23 is gradually expanded;

as shown in fig. 7, one end of the sensing cylinder 24, which is away from the valve plate 4 corresponding thereto, is communicated with a pressure measuring device used in cooperation with the valve, and along with the expansion of the air bag 23 (such that the degree of expansion of subcutaneous muscle tissue is increasingly greater), the air pressure environment inside the air bag 23 detected by the pressure measuring device is also gradually increased, in the subsequent process, if the air bag 23 touches the transverse projection hidden in the muscle tissue, the air bag 23 cannot be continuously expanded at this time (the transverse projection is harder than the peripheral muscle tissue) and the air pressure environment inside the air bag 23 is suddenly increased along with the continuous outward movement of the draw hook 3, when the pressure measuring device detects that the air pressure environment inside the air bag 23 is increased to a certain degree, the valve corresponding to the air bag 23 is controlled to be closed, such that the gas cannot continuously enter the air cylinder 2 through the air inlet pipe 13 (at this time, the valve plate 4 cannot continuously move away from the central axis), the drag hook 3 stops moving (only the air bag 23 is contacted with the transverse process at this time, the drag hook 3 is not contacted with the transverse process yet), thereby avoiding the situation that the drag hook 3 is collided with the transverse process and the transverse process is broken and fractured due to the continuous pulling towards the outside.

Example 7, based on example 6, as shown in fig. 4, the pressure measuring device includes a pressure measuring cylinder 26 mounted on the adjusting frame 1 (as shown in fig. 7, the top wall of the pressure measuring cylinder 26 is communicated with the side of the sensing cylinder 24 away from the valve plate 4 through a pipeline), and a pressure measuring plate 27 is vertically slidably mounted in the pressure measuring cylinder 26 (a spring is connected between the bottom wall of the pressure measuring cylinder 27 and the bottom wall of the pressure measuring cylinder 26, and the bottom of the pressure measuring cylinder is communicated with the external environment), the valve includes a step channel 28 disposed in the air inlet pipe 13, and a control ball 29 having the same diameter as the step channel 28 is disposed at the end having the larger inner diameter of the step channel 28, the control ball 29 is rotatably mounted in the air inlet pipe 13 and is provided with a through hole through the axis thereof, a torsion spring 31 is disposed between the end of the air inlet pipe 13 and the bottom of the pressure measuring cylinder 27, a cantilever of the U-shaped rod 32 extends outwards from the bottom wall of the pressure measuring cylinder 26 and is slidably fitted with the U-shaped rod 32, another cantilever is fitted with a positioning hole 33 disposed at the end of the control ball 29 disposed outside the air inlet pipe 13, initially, when the air inlet pipe 13 is in a conducting state, the through hole of the control ball 29 and the stepped passage 28 are coaxial (so that the stepped passage 28 is in a conducting state), and at this time, the torsion spring 31 connected between the outer end of the control ball 29 located at the air inlet pipe 13 and the air inlet pipe 13 is in an energy storage state (at this time, one cantilever of the U-shaped rod 32 is inserted into the positioning hole 33 provided at the outer end of the control ball 29 located at the air inlet pipe 13, as shown in fig. 4);

when gas flows to the transfer cavity 14 through the shunt 6 and the one-way valve and flows to the two gas inlet pipes 13 through the transfer cavity 14 to be delivered, finally the gas enters the two gas cylinders 2 respectively to drive the two valve plates 4 to face one end away from the central axis of the spine, and finally the draw hooks 3 positioned at two sides are driven to realize the effect of expanding the operation incision outwards, in the process, the gasbag 23 arranged at the bending part of the draw hook 3 is synchronously expanded (as shown in figure 7, the cavity positioned in the space at the left side of the sensing plate 25 is communicated with the gasbag 23), subcutaneous muscle tissue is further drawn outwards along with the expansion of the gasbag 23, so that more spaces which can be operated by a doctor are generated at the deep part of the incision, and meanwhile, along with the expansion of the gasbag 23, the reaction force of the subcutaneous muscle tissue on the gasbag 23 is gradually increased (the draw hooks 3 draw outwards, the larger the resistance force of the draw hook 3 and the air bag 23 is, the larger the degree of outward drawing is, the harder the air bag 23 is to expand), along with the continuous gas entering into the gas cylinder 2 through the flow divider 6 and the gas inlet pipe 13, at this time, the gas pressure in the space on the left side of the sensing plate 25 shown in fig. 7 is gradually increased, at this time, the gas pressure in the space above the pressure measuring cylinder 26 above the pressure measuring cylinder 27 is also synchronously increased, and further, the pressure measuring cylinder 27 is forced to move downwards in the pressure measuring cylinder 26 and compress the spring connected with the pressure measuring cylinder (the pressure measuring cylinder 27 synchronously drives the U-shaped rod 32 connected with the pressure measuring cylinder to move downwards while moving downwards, at this time, a cantilever of the U-shaped rod 32 inserted into the positioning hole 33 also synchronously moves downwards);

if the airbag 23 installed at the bending portion of the retractor 3 touches the transverse process in the subsequent outward pulling process, because the transverse process has higher hardness than the surrounding muscle tissue, the expansion of the airbag 23 is blocked (the airbag 23 cannot be expanded continuously due to the blockage of the transverse process), but the retractor 3 still continuously moves in the direction away from the central axis of the spine, at this time, the airbag 23 is extruded by the retractor 3 and is extruded by the transverse process, so that the air pressure in the airbag 23 (the airbag 23, the space in the sensing cylinder 24 on the left side of the sensing plate 25, and the space in the pressure measuring cylinder 26 above the pressure measuring plate 27 are communicated) is increased, and further the air pressure in the space above the pressure measuring plate 27 is increased, and further the downward moving speed of the pressure measuring plate 27 in the pressure measuring cylinder 26 relative to the airbag 23 when the transverse process is not touched by the transverse process is increased, so that a cantilever of the U-shaped rod 32 and the positioning hole 33 is completely withdrawn from the positioning hole 33, at this time, the control ball 29 is no longer positioned and rotates rapidly under the action of the torsion spring 31 engaged with the control ball (the control ball 29 is set to rotate only 90 ° in the step passage 28, a stop engaged with the portion of the control ball 29 extending out of the air inlet pipe 13 can be provided on the air inlet pipe 13 to limit the rotation angle of the control ball 29, so that when the control ball 29 rotates 90 ° under the action of the torsion spring 31, the control ball 29 cannot rotate continuously even though still receiving the force of the torsion spring 31, at this time, the arc-shaped surface of the control ball 29 abuts against the end position with the smaller diameter of the step passage 28), at this time, the through hole provided in the control ball 29 is no longer communicated with the step passage 28, and at this time, the air inlet pipe 13 is in a non-conducting state, as shown in fig. 1, the air in the other air cylinder 2 cannot continue to pass through the transfer chamber 14, the air inlet pipe 13 to convey the air into the opposite air cylinder 2, the valve plate 4 in the opposite side air cylinder 2 can not move continuously in the direction far away from the central axis of the spine (at this time, if the screw feeding route is exposed, the incision side can be stopped from being pulled outwards, and if the screw feeding route is not exposed, the doctor can only adjust the position of the adjusting frame 1 relative to the incision, so that the draw hook 3 is staggered with the transverse projection part, and the outward pulling can be continued);

similarly, when the screw is placed into the other side of the incision, a doctor controls the flow divider 6 to be communicated with the S pipe 7 corresponding to the opposite side air cylinder 2, and makes the gas generated by the gas generating device enter the opposite side air cylinder 2, and at the moment, under the action of the valve plate 4 in the opposite side air cylinder 2, the gas in the space at one side of the valve plate 4 facing to the central axis of the spine is transferred into the other air cylinder 2 through the gas inlet pipe 13, so that the effect of continuously pulling the other side surgical incision outwards is achieved, and the specific process is as above, which is not described herein;

note: as shown in fig. 4, the elastic coefficient of the spring connected to the pressure measuring plate 27 is directly related to the time point when the control ball 29 is released from positioning, and the degree of spreading the subcutaneous muscle tissue outward is different when different patients perform the spinal fusion, mainly influenced by their body shapes (different body shapes for adults, children, and the elderly, or a larger influence on fat and thin), so when selecting the spring, the spring should be selected according to different patients.

Embodiment 8, on the basis of embodiment 1, as shown in fig. 11, the gas generating device includes a bottom plate 34 (in the process of performing the operation, the bottom plate 34 is fixedly installed on the ground beside the operating table), a pedal 35 is rotatably installed on the bottom plate 34, an arc-shaped cavity 36 is integrally formed on the bottom plate 34, an arc-shaped plate 37 is in sliding fit contact with the arc-shaped cavity 36 (the upper end of the arc-shaped cavity 36 is communicated with the outside), the arc-shaped plate 37 is driven by the pedal 35 and is elastically connected with the bottom plate 34, when the operation is performed, a doctor only needs to place his or her foot on the bottom plate 34, when the incision of the operation needs to be opened to the outside, the doctor presses the pedal 35 with his or her foot to drive the arc-shaped plate 37 to move downwards in the arc-shaped cavity 36, so that the gas in the space below the arc-shaped plate 37 is discharged outwards through one of the one-way pipes 38 (the one-way pipe 38 is connected with a hose, and the hose is communicated with the inlet pipe 19 through the rotary joint), the effect of conveying gas into the shunt 6 is realized, and in the operation process, a doctor can control whether the draw hook 3 continues to draw only by controlling whether the foot of the doctor presses the pedal 35;

after the doctor finishes treading once, the treading pressure applied on the treading plate 35 is removed, the treading plate 35 rotates in the opposite direction (until the treading plate moves to the initial position) under the action of a spring connected with the treading plate 35, at the moment, the outside air enters the arc-shaped cavity 36 through another one-way pipe 38 arranged at the bottom of the arc-shaped cavity 36 along with the movement of the arc-shaped plate 37 (along with the movement of the arc-shaped plate 37, the air cannot enter the arc-shaped cavity 36 through another one-way pipe 38 communicated with the merging pipe 19 at the moment), and the two one-way pipes 38 are arranged to enable the air to flow in one direction only;

the doctor carries out laminectomy and spinal fusion through both hands of the doctor, the traction degree of the drag hooks 3 is controlled through the feet, the shunt 6 is communicated with the transfer cavity 14 (two S pipes 7) to control the traction directions of the drag hooks 3 at both sides, so that the whole operation process can be completed under the condition of one person, if the spinal fusion is to be carried out and the incision is required to be continuously pulled to one side, the air bag 23 touches the transverse process and closes the corresponding air inlet pipe 13 (because the air cannot continuously flow), the doctor obviously feels larger resistance when stepping on the pedal 35 (the doctor stops continuously stepping on the pedal), in the process of pulling the operation incision to two sides, the doctor can control the speed of stepping on the pedal 35 through controlling the feet of the doctor to control the speed of stepping on the pedal 35 to pull the drag hooks 3 to two sides, and therefore the process of the operation incision is variable, namely controllable traction, Is safe and efficient.

Example 9, on the basis of example 5, as shown in fig. 9, a shunt tube 41 (the shunt tube 41 is communicated with the side of the sensing cylinder 24 away from the valve plate 4 through a hose) is arranged on the arc-shaped frame 21, the shunt tube 41 is internally provided with an electric heating wire 42, the electric heating wire 42 is connected in series in a pressure stabilizing loop, an air chamber 40 communicated with the air chamber 23 is arranged in the retractor 3, when the retractor 3 pulls the surgical incision to two sides, as shown in fig. 7, the air in the space on the left side of the sensing plate 25 also synchronously enters the air chamber 23 and expands the air chamber 23 (thereby realizing that the muscle tissue under the skin has a larger pulling effect relative to the position of the incised epidermis, and opening a larger surgical operation space in the depth of the skin of the patient);

before the pulling operation, the pressure stabilizing circuit needs to be connected and the heating wire 42 is operated (heated), so that the gas entering the air bag 23 through the shunt tube 41 is heated (the gas entering the air bag 23 can also heat the corner 22 of the retractor 3), so that the gas inside the air bag 23 is at a proper temperature (the heating value of the heating wire 42 is controlled by controlling the current flowing through the heating wire 42), so that the gas can be heated to be approximately the same as the temperature of the human body after flowing through the shunt tube 41, because the corner 22 of the retractor 3 and the air bag 23 arranged at the position are in direct contact with the subcutaneous muscle tissue, if the heating wire 42 is not arranged, the air bag 23 is in contact with the subcutaneous muscle tissue of the patient, so that a certain degree of stress reaction is generated on the subcutaneous muscle tissue (the temperatures of the air bag 23 and the retractor 3 are lower than the temperature of the human body), when the organism is in the cold environmental condition, can stimulate central nervous system, mobilize the activity of sympathetic adrenal medulla system immediately, realize improving central nervous system's excitation, make organism rhythm of the heart accelerate, the strength of the heart contraction is strengthened, cardiac output increases, raise blood pressure, accelerate blood circulation, can make muscle blood flow increase finally, because the muscle of this position is in the state of being peeled off this moment, if above-mentioned situation appears can aggravate the bleeding condition of wound position undoubtedly, make the amount of bleeding increase, be unfavorable for going on smoothly of operation, therefore, heat the gas through setting up heating wire 42, thereby realize making gasbag 23, the corner portion 22 of drag hook 3 that contact with subcutaneous musculature heat, make it keep the same basically with human temperature, can effectively avoid above-mentioned stress reaction.

The above description is only for the purpose of illustrating the present invention, and it should be understood that the present invention is not limited to the above embodiments, and various modifications conforming to the spirit of the present invention are within the scope of the present invention.

Claims

1. The vertebral plate drag hook traction adjusting device comprises an adjusting frame (1) and is characterized in that air cylinders (2) are arranged on the longitudinal two sides of the adjusting frame (1) respectively, drag hooks (3) matched with the air cylinders (2) are longitudinally slid on the adjusting frame (1), the drag hooks (3) are connected with valve plates (4) which are coaxially slidably installed in the air cylinders (2) and elastically connected with the air cylinders, one opposite sides of the air cylinders (2) are jointly connected with one-way valves arranged on the adjusting frame (1) and communicated with a flow divider (6), and one opposite sides of the air cylinders (2) are respectively communicated with the flow divider (6) through air passages (5) and the flow divider (6) is communicated with a gas generating device;

the air flue (5) and the flow divider (6) are matched to meet the following requirements: when the gas enters the gas cylinder (2) through the one-way valve, the gas channel (5) is in a conducting state with the outside, and when the gas enters the gas cylinder (2) through the gas channel (5), the gas channel (5) is in a closed state.

2. The vertebral plate drag hook traction adjusting device of claim 1, characterized in that, the air flue (5) is equipped with two bulges (8) including communicating on S pipe (7) and S pipe (7) between inflator (2) and shunt (6) the interval, axial slidable mounting has in bulge (8) the internal diameter of trachea and two bulges (8) ladder pipe (9) of elastic connection with it, and ladder pipe (9) both ends are arranged respectively in two bulges (8) and with all with bulge (8) inner wall sliding fit contact, axial sliding has first valve ball (10) of elastic connection with it in the great one end of ladder pipe (9) diameter, is equipped with through-hole (11) with external intercommunication on the great one end matched with bulge (8) wall of ladder pipe (9) diameter.

3. The laminectomy retractor pulling adjustment device according to claim 2, wherein the opposite sides of the two air cylinders (2) are respectively communicated with an air inlet pipe (13), the two air inlet pipes (13) are jointly communicated with a transfer chamber (14), the one-way valve comprises a stepped air hole (15) connected with the transfer chamber (14) and the diameter of the shunt (6), the end of the stepped air hole (15) with the smaller diameter is communicated with the shunt (6), and a one-way ball (16) elastically connected with the stepped air hole is axially slid in the stepped air hole (15).

4. The laminectomy retractor pulling adjustment device of claim 3, wherein the flow divider (6) comprises a circular cavity (17) communicated with the S-shaped tube (7) and the stepped air hole (15), and a flow dividing circular plate (18) is coaxially rotated in the circular cavity (17), the flow dividing plate is integrally provided with a converging tube (19) through the axis of the flow dividing circular plate, and the flow dividing circular plate (18) is internally provided with a flow dividing channel (20) respectively communicated with the converging tube (19) and the outside along the radial direction of the flow dividing circular plate.

5. The laminectomy retractor pulling adjusting device of claim 3, wherein the valve plate (4) is arranged at one end outside the air cylinder (2) and provided with an arc-shaped frame (21), the pulling hooks (3) are fixed at two ends of the arc-shaped frame (21) respectively, the bottom of each pulling hook (3) is provided with a corner part (22), an air bag (23) is arranged on the inner side of each corner part (22), the air bags (23) are communicated with a sensing device arranged in the air cylinder (2), and the air inlet pipe (13) is provided with a valve which can be controlled to be opened and closed according to the pressure of the air bags (23).

6. The laminectomy retractor pulling adjustment device according to claim 5, wherein the sensing device comprises a sensing cylinder (24) which is coaxially arranged in the air cylinder (2) and is fixedly installed with the air cylinder, a sensing plate (25) which is elastically connected with the sensing cylinder is arranged in the sensing cylinder (24) in a sliding manner coaxially with the air cylinder, the sensing plate (25) is driven by the valve plate (4) corresponding to the sensing cylinder, one end, close to the corresponding valve plate (4), of the sensing cylinder (24) is communicated with the outside atmosphere, one end, far away from the valve plate (4), of the sensing cylinder (24) is communicated with an air bag (23) corresponding to the sensing cylinder, and one end, far away from the valve plate (4), of the sensing cylinder (24) is communicated with a pressure measuring device matched with the valve.

7. The vertebral plate drag hook traction adjusting device according to claim 6, characterized in that the pressure measuring device comprises a pressure measuring cylinder (26) arranged on the adjusting frame (1) and a pressure measuring plate (27) which is vertically and slidably arranged in the pressure measuring cylinder (26) and is elastically connected with the pressure measuring cylinder, the valve comprises a step passage (28) arranged in the air inlet pipe (13) and a control ball (29) with the same diameter as the step passage (28) at one end with the larger inner diameter, the control ball (29) is rotatably arranged in the air inlet pipe (13) and is provided with a through hole (30) through the axis of the air inlet pipe (13), the control ball (29) is arranged between the outer end of the air inlet pipe (13) and is provided with a torsion spring (31), and the pressure measuring plate (27) is arranged at the outer end of the pressure measuring cylinder (26) and is provided with a U-shaped rod (32) and the U-shaped rod (32) realizes the positioning of the control ball (29).

8. The vertebral plate drag hook traction adjusting device according to claim 1, characterized in that the gas generating device comprises a bottom plate (34), a pedal (35) is rotatably installed on the bottom plate (34), an arc-shaped cavity (36) is integrally formed in the bottom plate (34), an arc-shaped plate (37) is in sliding fit contact with the arc-shaped cavity (36), the arc-shaped plate (37) is driven by the pedal (35) and is elastically connected between the pedal (35) and the bottom plate (34), and two one-way pipes (38) are respectively arranged at the bottoms of the arc-shaped cavity (36) to enable gas to flow in different directions.

9. The laminectomy retractor pulling adjustment device of claim 5, wherein the curved frame (21) is provided with a shunt tube (41) connected to the two air bags (23), and an electric heating wire (42) is arranged in the shunt tube (41), and the electric heating wire (42) is connected in series to the voltage stabilizing loop.