CN212281518U - Micro power system for operation - Google Patents

Abstract

The utility model provides a fine motion driving system is used in operation relates to surgical operation equipment technical field, has solved and has used the hammer to provide the hammering power in the operation, wastes time and energy, is difficult to the technical problem of accuse. The micro-motion power system for the operation comprises a gun-shaped or columnar shell, a main shaft, a power assembly and a clamping assembly, wherein the main shaft is movably arranged in the shell and can extend out or retract relative to the shell, and the clamping assembly is connected with one end of the main shaft, which extends out of the shell; the power assembly is movably arranged in the shell, is intermittently in contact connection with the main shaft, and can apply positive hammering force or reverse hammering force to the main shaft when in contact each time. The utility model is used for the surgery provides cutting, the grinding of a whole set of bone structure, the bone grafting face is handled, trial model and fuse putting into, taking out of ware, intramedullary nail etc, the instrument system of a series of operation operations such as the packing of bone grafting material, ramming, can realize foretell a series of operation operations, have quick, high-efficient, stable, safe characteristics.

Description

Micro power system for operation

Technical Field

The utility model belongs to the technical field of surgical operation equipment technique and specifically relates to a fine motion driving system is used in operation.

Background

In the operation, the operation processes of cutting and grinding of bone structure, treatment of bone grafting surface, insertion and extraction of trial mold and fusion device, intramedullary nail, etc., and filling and ramming of bone grafting material are often performed, and in the above operation processes, instruments such as osteotome, bone shovel or osteotome are often used.

In the existing operation and spine surgery, doctors use hammers or hammers to beat instruments such as osteotomes/bone shovels/bone knives to perform actions such as ramming and hammering, and the operation mode is time-consuming, labor-consuming and low in efficiency; the instrument is not easy to handle and control because the instrument and the hammer or the hammer need to be held by hands, and once the instrument falls into the abdominal cavity of a human body, important visceral organs in the abdominal cavity are easy to damage; and the hammer or hammer is bulky, and the operation space of the operation is large, and the instruments are replaced more in the operation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fine motion driving system is used in operation to use the hammer to provide the hammering power in the operation that exists among the solution prior art, waste time and energy, be difficult for the technical problem of accuse.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a fine motion power system for operation, which comprises a gun-shaped or cylindrical shell, a main shaft, a power assembly and a clamping assembly, wherein the main shaft is movably arranged in the shell and can extend out or retract relative to the shell, and the clamping assembly is connected with one end of the main shaft extending out of the shell; the power assembly is movably arranged in the shell and is intermittently in contact connection with the main shaft, and positive hammering force or reverse hammering force can be applied to the main shaft when the power assembly is in contact with the main shaft every time.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

As a further improvement of the utility model, the interval is provided with first retaining ring and second retaining ring on the main shaft, just first retaining ring with distance between the second retaining ring is greater than power component's portable distance works as when the centre gripping subassembly is in the pressurized or is drawn, the main shaft indentation or stretches out the casing, so that first retaining ring or the second retaining ring is located in the power component moving route.

As a further improvement of the present invention, the main shaft is further provided with a reset assembly, wherein the reset assembly is arranged between the first retaining ring and the housing, and the second retaining ring and the housing can be driven by the reset assembly.

As a further improvement, the power assembly comprises a motor, a crankshaft, a connecting rod and a piston which are connected in sequence in a transmission manner, the piston sleeve is arranged on the first retaining ring and the second retaining ring, the spindle is arranged on the outer side of the spindle, and the spindle can freely move relative to the spindle.

As a further improvement, the utility model also comprises a counterweight component arranged at the other end of the main shaft.

As a further improvement, the reset assembly is a spring, and is located the first retainer ring left side with the second retainer ring right side the maximum compression amount of the spring is the same or different, and two the maximum compression amount of the spring is all less than the crankshaft radius.

As a further improvement of the present invention, when the clamping assembly is not subjected to a force, the first retainer ring and the second retainer ring have a first gap and a second gap between the left and right extreme positions of the piston stroke, the first gap and the second gap have the same or different specifications, and are all smaller than the maximum compression amount of the spring.

As a further improvement of the present invention, when the retraction stroke is greater than or less than when the main shaft is pressed, the main shaft is pulled to extend out of the stroke, the first gap is less than the second gap, and/or, is located on the left side of the first retainer ring the maximum compression amount of the spring is greater than and located on the right side of the second retainer ring the maximum compression amount of the spring.

As a further improvement of the present invention, when the piston moves, the impact force of the piston is greater than the pulling force or the pressure of the spring when the first retainer ring or the second retainer ring strikes.

As a further improvement, be provided with the baffle in the casing, can with two independent spaces are separated into to the inner chamber of casing, power component sets up in the left side space, counterweight assembly sets up in the right side space, counterweight assembly includes third retaining ring and two sections springs, the third retaining ring is established at right side space middle part, two sections the spring is located respectively the baffle with the third retaining ring the casing with between the third retaining ring.

As a further improvement of the utility model, the stroke of the first check ring and the second check ring under the action of the hammering force is 1-8 mm.

As a further improvement of the utility model, the striking frequency of the piston and the first retaining ring or the second retaining ring is 8000 times/minute in order to 200-.

Compared with the prior art, the utility model following beneficial effect has:

the utility model provides a fretting power system for operation provides cutting, grinding of a whole set of bone structure for surgery operation, bone grafting face is handled, trial mould and fuse the instrument system of putting into, taking out of ware, intramedullary nail etc. the instrument system of a series of operation operations such as packing, ramming of bone grafting material, can realize a series of above-mentioned operation operations, has characteristics quick, high-efficient, stable, safe, the utility model discloses a fretting power system is different from supersound bone knife and abrasive drilling that use in the present operation, the utility model discloses a fretting power system for operation produces heat quantity in the use lowly, can not produce the thermal injury to human tissue, is favorable to art district tissue restoration, healing; the amplitude (the stroke of the first retaining ring and the second retaining ring under the action of the hammering force) used by the micro-motion power system for the operation is 1 to 8 millimeters, so that even if the tool is prolonged, the working efficiency of a working part cannot be obviously attenuated, the working efficiency cannot be influenced, the micro-motion power system can be used for operating under direct vision, and can also be suitable for long-distance work of operating systems such as endoscopes and channels; the utility model discloses fine motion driving system for operation adopts the operating frequency range to be 200-; the utility model discloses fine motion driving system for operation includes the host computer of an adjustable frequency and power (the regulation of frequency and power is power and frequency through adjusting motor), is connected with the surgical instruments of a plurality of differences through the ball valve quick-mounting head, can satisfy the multiple operation in the operation, realizes real a tractor serves several purposes, and the system is stable, and amplitude, frequency and power regulation are convenient smooth and easy.

The utility model provides a fine motion driving system is used in operation through the peculiar structure of motor drive bent axle connecting rod, has laborsaving, quick, accurate, save operating space's characteristics, only needs to change the head end of installing on the centre gripping subassembly, just can realize a tractor serves several purposes, and can get the intramedullary nail.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic perspective view of the micro power system for operation of the present invention;

FIG. 2 is a schematic view of the three-dimensional structure of the micro-motion power system for operation of the present invention after being split along the axis;

fig. 3 is a front view of the micro-motion power system for operation of the present invention after being split along the axis.

FIG. 1, a housing; 2. a main shaft; 21. a first retainer ring; 22. a second retainer ring; 23. a first spring; 24. a second spring; 25. a third retainer ring; 26. a third spring; 27. a fourth spring; 3. a power assembly; 31. a motor; 32. a crankshaft; 33. a connecting rod; 34. a piston; 4. a clamping assembly; 5. a partition plate; 6. a switch; 100. a flat-blade osteotome shovel head; 200. a curved-edge osteotome shovel head; 300. a bone knife hook; 400. hammering the head end; 500. taking a fusion device or an intramedullary nail connector.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the utility model provides a micro-motion power system for operation, which comprises a gun-shaped or cylindrical shell 1, a main shaft 2, a power component 3 and a clamping component 4; the clamping component 4 is a ball valve quick-mounting head, which is a product of the prior art purchased from the outside market, the clamping component 4 clamps head end instruments for operation, the head end instruments are various in types and are respectively used for different operation treatment processes, as shown in fig. 1-3, a flat-edge osteotome shovel head 100, an arc-edge osteotome shovel head 200, an osteotome hook 300, a hammering head end 400 and a fusion taking device or an intramedullary nail connector; the shell 1 comprises a transverse part and a vertical part, the main shaft 2 is movably arranged in the shell 1, specifically arranged in the transverse part and can extend out or retract relative to the shell 1, and the clamping component 4 is connected with one end of the main shaft 2 extending out of the shell 1; the power assembly 3 is movably arranged in the shell 1, specifically, in the vertical part, is intermittently in contact connection with the main shaft 1, and can apply positive hammering force or reverse hammering force to the main shaft 2 during each contact.

As shown in fig. 2 and fig. 3, it should be noted here that both ends of the transverse portion have openings for the main shaft 2 to extend out, the vertical portion is connected to the right position of the transverse portion, and the clamping assembly 4 is connected to the main shaft 2 at one end of the transverse portion away from the vertical portion; the horizontal part and the vertical part are both hollow cylindrical structures. When the power assembly 3 applies the main shaft 2 with a positive hammering force, the micro power system is used as a power source of the hammering force of the head end apparatus to drive the head end apparatus to continuously hammer the bone; when power component 3 applys main shaft 2 with reverse hammering power, the power source of fine motion driving system as head end apparatus pulling force to drive head end apparatus and extract the operation to the intramedullary nail or the fusion ware that need pull out, the utility model provides a, forward indicates to indicate the direction of left end one side by 1 right-hand member of casing, and reverse indicates the direction of pointing to right-hand member one side by 1 left end of casing.

The action characteristics of power component 3 have decided that main shaft 2 by the hammering or by the drawing action characteristics, can select to use according to actual need in the utility model discloses an embodiment, power component 3 is with fixed cycle interval mode forward beat or the reverse main shaft 2 of beating.

As an alternative embodiment, the main shaft 2 is provided with a first retaining ring 21 and a second retaining ring 22 at intervals, and the distance between the first retaining ring 21 and the second retaining ring 22 is greater than the movable distance of the power assembly 3, that is, in the original state, the first retaining ring 21 and the second retaining ring 22 are located outside the range of the moving route of the power assembly 3; the first retainer ring 21 and the second retainer ring 22 are fixed on the main shaft 2, are disc-shaped, and have diameters smaller than the diameter of the inner cavity of the shell 1, when the clamping assembly 3 is not stressed, namely when the micro-motion power system is in an idle state, the power assembly 3 can move between the first retainer ring 21 and the second retainer ring 22, and does not touch any retainer ring; when the clamping assembly 4 is under compression or tension, the spindle 2 retracts or extends out of the housing 1, so that the first retainer ring 21 or the second retainer ring 22 is located in the moving path of the power assembly 3, wherein the power assembly 3 moves to contact with one retainer ring and apply hammering force, while the other retainer ring is not in contact with the power assembly 3 at all times, and the power assembly 3 can reciprocate in the housing 1 to perform periodic hammering action on one retainer ring.

As shown in fig. 3, the spindle device further includes a reset assembly disposed between the first retainer ring 21 and the housing 1 and between the second retainer ring 22 and the housing 1, and capable of driving the spindle 2 to reset.

Specifically, the reset component is a spring sleeved on the main shaft 2, further, the spring sleeved between the first retainer ring 21 and the inner wall of the housing 1 is a first spring 23, and the spring sleeved between the second retainer ring 22 and the inner wall of the housing 1 is a second spring 24. When the first retainer ring 21 moves toward the left end of the housing 1, the first spring 23 is compressed and the second spring 24 is extended; when the second retainer 22 moves toward the right end of the housing 1, the second spring 24 is compressed and the first spring 23 is extended.

It should be noted that the maximum compression amounts of the first spring 23 and the second spring 24 may be the same or different, and in this embodiment, two springs having the same maximum compression amount are used; it should be noted here that the spring constants of the first spring 23 and the second spring 24 may be the same or different, and the specifications may be the same or different, and in this embodiment, two identical springs are used, and the maximum compression amounts of the first spring 23 and the second spring 24 are both smaller than the radius of the crankshaft 32.

As shown in fig. 3, the power assembly 3 includes a speed reduction motor 31, a crankshaft 32, a connecting rod 33 and a piston 34, which are connected in sequence in a transmission manner, the piston 34 is sleeved outside the main shaft 2 between the first retaining ring 21 and the second retaining ring 22 and can move freely relative to the main shaft 2, that is, when the main shaft 2 and the piston 34 are not in contact, the piston 34 does not follow the movement when the main shaft 2 moves, and when the piston 34 moves, the main shaft 2 does not follow the movement. The piston 34 is of cylindrical configuration. A switch 6 is also provided on the top of the vertical portion of the housing 1, and the activation of the motor 31 can be controlled by pressing the switch 6.

As shown in fig. 2 and 3, a counterweight assembly is further included at the other end of the main shaft 2.

A partition plate 5 is arranged in the shell 1 and can divide the inner cavity of the shell 1 into two independent spaces, and a through hole is formed in the partition plate 5 and is convenient for the main shaft 2 to pass through; furthermore, the baffle 5 is close to the right end of the shell 1; the power assembly 3 is arranged in the left space, the counterweight assembly is arranged in the right space, the counterweight assembly comprises a third check ring 25 and two sections of springs, the third check ring 25 is arranged in the middle of the right space, the two sections of springs are respectively a third spring 26 and a fourth spring 27, the third spring 26 is arranged between the partition plate 5 and the third check ring 25, and the fourth spring 27 is arranged between the third check ring 25 and the inner wall of the shell 1.

The specifications, maximum compression amount, elastic modulus and other parameters of the third spring 26 and the fourth spring 27 may be the same as or different from those of the first spring 23, and in order to simplify the structure and facilitate the design, in this embodiment, four identical springs are used.

When the clamping assembly 4 is not stressed, a first gap and a second gap are formed between the first retainer ring 21 and the second retainer ring 22 and the left and right limit positions of the stroke of the piston 34, the first gap and the second gap are the same or different in specification, and the first gap and the second gap are both smaller than the maximum compression amount of the spring. In the present embodiment, the first gap and the second gap are both selected to be 2 mm; the maximum compression of the spring is 8mm and the radius of the crankshaft 32 is 11 mm.

When the retraction stroke of the main shaft 2 is larger or smaller than the extension stroke of the main shaft 2 in tension when the main shaft 2 is compressed, the first clearance is smaller than the second clearance, and/or the maximum compression amount of the spring positioned at the left side of the first retainer ring 21 is larger than the maximum compression amount of the spring positioned at the right side of the second retainer ring 22.

In this embodiment, the retraction stroke when under compression is exactly the same as the extension stroke when under tension.

When the piston 34 moves and collides with the first retainer 21 or the second retainer 22, the collision force is larger than the pulling force or the pressing force of the spring. Through the structural design, the spindle 2 can be displaced by a small amplitude of 1-8mm under the hammering of the piston 34.

Further, the stroke of the first stop, 21 and the second stop 22 under the action of the hammering force is 1-8 mm.

The striking frequency of the piston 34 and the first check ring 21 or the second check ring 22 is 200-.

The specific operation method comprises the following steps:

when the micro-motion power system is used as a positive hammering power source, namely when the surgical instrument arranged on the clamping component 4 is an osteotome, a bone shovel or a osteotome, firstly, the surgical instrument is arranged on the clamping component 4, then the vertical part of the micro-motion power system is held by hands, the surgical instrument is pressed at the position of a bone to be processed, due to the pressing force, the spindle 2 retracts inwards, the first check ring 21 moves towards one side of the piston 34 and is connected with the piston 34, the speed reducing motor 31 is started, when the device is in an initial state, the crankshaft 32 is positioned at the leftmost side, the motor 31 drives the crankshaft 32 to rotate towards the right side after running, the connecting rod 33 follows to move towards the right side, thereby driving the piston 34 to move towards the right side, and simultaneously when the piston 34 moves, due to the pressing force, the spindle 2 still retracts a little and enters the reciprocating stroke of the piston 34, and when the piston 34 moves to the rightmost end, the piston 34 is contacted with the first check ring 21 in the moving stroke and forms hammering force on the first check ring 21 due to the action of inertia force, the hammering force applied to the first check ring 21 by the piston 34 is transmitted to a surgical instrument, the piston 34 turns back and stops for a short time and then moves circularly to the right, and therefore the hammering force is continuously circulated and applied to the first check ring 21; after the operation, the motor 31 is turned off, the micro power system is lifted, the main shaft 2 is reset due to the elastic force of the spring, the original position is recovered, the surgical instrument is detached, and the new surgical instrument is replaced to perform the next operation step or store the surgical instrument. Waiting for the next surgical procedure.

When the micro-motion power system is used as a reverse hammering power source, namely when the surgical instrument arranged on the clamping component 4 is an instrument for drawing the intramedullary nail, firstly, the instrument for drawing the intramedullary nail is arranged on the clamping component 4, then the vertical part of the micro-motion power system is held by hands, the intramedullary nail is grabbed by the instrument, and the micro-motion power system is pulled by force, because of pulling force, the main shaft 2 extends outwards, the second check ring 22 moves towards one side of the piston 34, because the distance between the first check ring 21 and the second check ring 22 is greater than the moving stroke of the piston 34 and is positioned outside the moving route, and when the device is in an initial state, the crankshaft 32 is positioned at the leftmost side, namely the piston 34 is positioned at the leftmost extreme point of the moving route, when the micro-motion power system is pulled, the second check ring 22 moves leftwards and can move into the moving route of the; starting the speed reducing motor 31, when the device is in an initial state, the crankshaft 32 is positioned at the leftmost side, the motor 31 drives the crankshaft 32 to rotate towards the right side after running, the connecting rod 33 moves towards the right side along with the crankshaft, so as to drive the piston 34 to move towards the right side, when the piston 34 moves to the right end and contacts with the second stop ring 22, a hammering force applied to the second stop ring 22 by the piston 34 is applied to the second stop ring 22 due to the action of inertia force, the hammering force applied to the second stop ring 22 by the piston 34 is transmitted to a surgical instrument, and the piston 34 returns back and stops for a short time and then moves circularly towards the left, so that the hammering force is continuously and circularly applied to the second stop ring; the motor 31 is turned off, the micro-motion power system is lifted, the main shaft 2 is reset due to the elastic force of the spring and is restored to the original position, the surgical instrument is detached, and a new surgical instrument is replaced to perform the next surgical step or store the surgical instrument. Waiting for the next surgical procedure.

It should be noted that "inward" is a direction toward the center of the accommodating space, and "outward" is a direction away from the center of the accommodating space.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the orientation or positional relationship shown in fig. 1, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A micro-motion power system for surgery is characterized by comprising a gun-shaped or cylindrical shell, a main shaft, a power assembly and a clamping assembly, wherein the main shaft is movably arranged in the shell and can extend out or retract relative to the shell, and the clamping assembly is connected with one end of the main shaft, which extends out of the shell; the power assembly is movably arranged in the shell and is intermittently in contact connection with the main shaft, and positive hammering force or reverse hammering force can be applied to the main shaft when the power assembly is in contact with the main shaft every time.

2. The surgical micromotion power system according to claim 1, wherein a first retaining ring and a second retaining ring are arranged on the main shaft at intervals, the distance between the first retaining ring and the second retaining ring is larger than the movable distance of the power assembly, and when the clamping assembly is under pressure or tension, the main shaft retracts or extends out of the shell, so that the first retaining ring or the second retaining ring is positioned in the moving path of the power assembly.

3. The surgical micromotion power system according to claim 2, further comprising a reset assembly disposed between the first retainer ring and the housing and between the second retainer ring and the housing for resetting the main shaft.

4. The micromotion power system for surgery as claimed in claim 3, wherein the power assembly comprises a motor, a crankshaft, a connecting rod and a piston which are sequentially connected in a transmission manner, and the piston is sleeved on the outer side of the main shaft between the first retaining ring and the second retaining ring and can freely move relative to the main shaft.

5. The surgical micropower system of claim 1, further comprising a counterweight assembly disposed at the other end of the main shaft.

6. The surgical micromotion power system according to claim 4, wherein the return assembly is a spring, the maximum compression amounts of the springs on the left side of the first retainer ring and the right side of the second retainer ring are the same or different, and the maximum compression amounts of both the springs are smaller than the radius of the crankshaft.

7. The surgical micromotion power system according to claim 6, wherein when the clamping assembly is not stressed, the first and second collars have first and second gaps between them and the left and right extreme positions of the piston stroke, the first and second gaps are of the same or different specifications, and the first and second gaps are each less than the maximum compression of the spring.

8. The surgical micromotion power system according to claim 7, wherein the first clearance is smaller than the second clearance when a retraction stroke is larger or smaller than a tension extension stroke of the main shaft when the main shaft is compressed, and/or the maximum compression amount of the spring on the left side of the first retainer ring is larger than the maximum compression amount of the spring on the right side of the second retainer ring.

9. The surgical micromotion power system according to claim 6, wherein the impact force of the piston when the piston collides with the first retainer ring or the second retainer ring during the movement is larger than the pulling force or the pressing force of the spring.

10. The micromotion power system for surgery as claimed in claim 5, wherein a partition is provided in the housing to separate the inner cavity of the housing into two separate spaces, the power assembly is provided in the left space, the counterweight assembly is provided in the right space, the counterweight assembly comprises a third retainer ring and two sections of springs, the third retainer ring is provided in the middle of the right space, and the two sections of springs are respectively located between the partition and the third retainer ring, and between the housing and the third retainer ring.

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