CN218899639U - Growth valve assembly - Google Patents

Abstract

The present utility model provides a growth valve assembly comprising: a fixed sleeve and two rod pieces; each rod piece comprises a connecting rod and a matching rod, one end of the matching rod is connected with the connecting rod, and the other end of the matching rod is provided with a rod part limiting sleeve; the matching rod is provided with a mounting surface and two receiving side surfaces which are arranged in parallel; each bearing side surface is provided with a boss, and a supporting table surface of the two bosses and a mounting surface of the matching rod form a stretching surface; the stretching surface is provided with a tooth part, the tooth part comprises a plurality of ratchets, and all ratchets are sequentially arranged along the length direction of the stretching surface; the rod part limiting sleeve comprises two limiting blocking pieces; the fixed sleeve comprises a sleeve body pressing plate and two positioning plates which are arranged in parallel. The growth valve assembly of the utility model can exist in a patient for a long time, can reduce the operation times of the patient and can reduce the pain of the operation of the patient.

Description

Growth valve assembly

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a growth valve assembly.

Background

For patients with congenital scoliosis of children, the curvature of the spine needs to be controlled before the bone growth and development are mature, otherwise, the scoliosis degree of the patients is possibly serious, the development of the thoracic cage and even important internal organs is affected, and even death is caused. The method can be used for carrying out conservative treatment on patients with lighter degree and good spinal flexibility, such as wearing a brace, but surgical intervention is needed on a large part of patients, so that the progress of the lateral bending angle is reduced or slowed down, and the lateral bending angle of the patients is controlled within a certain range before the development is completed.

The current common surgical procedure is to use a conventional growth valve. After the growth valve is installed on the concave vertebral body with lateral curvature, the upper connecting rod and the lower connecting rod are longitudinally spread to straighten the spinal bending section. After the first operation, the spine becomes longer due to the growth and development of the patient, and the fixing screw plug on one side is loosened at intervals, such as about half a year, so that the upper connecting rod or the lower connecting rod is longitudinally spread, and then the screw plug is used for locking. Most patients who undergo such surgery are less than fourteen years old, so that the patients need to undergo a stretching surgery for ten times at most, and the high-frequency surgery brings great pain to the patients and also brings heavy economic burden to family members of the patients.

How to design a growth valve assembly that can be automatically lengthened without performing multiple procedures is a problem that needs to be addressed by those skilled in the art.

Disclosure of Invention

In view of the above-described drawbacks of the prior art, the present utility model solves the technical problem of providing a growth valve assembly capable of being automatically lengthened without performing a plurality of operations.

To achieve the above and other related objects, the present utility model provides a growth valve assembly comprising: a fixed sleeve and two rod pieces;

each rod piece comprises a connecting rod and a matching rod, one end of the matching rod is connected with the connecting rod, a rod part limiting sleeve is arranged at the other end of the matching rod, the axial direction of the connecting rod is in the same direction as the axial direction of the matching rod, and the axial direction of the matching rod is in the same direction as the length direction of the matching rod; the matching rod is provided with a mounting surface and two parallel bearing side surfaces, and each bearing side surface is perpendicular to the mounting surface; each supporting side face is provided with a boss, the length of each boss is smaller than that of each supporting side face, each boss is provided with a supporting table face, the supporting table faces are coplanar with the mounting faces, the side face, far away from the corresponding matching rod, of each boss is a table body supporting face, the table body supporting face is perpendicular to the supporting table faces, and the supporting table faces of the two bosses are perpendicular to the mounting faces of the corresponding matching rod to form a stretching face; the stretching surface is provided with a tooth part, the tooth part comprises a plurality of ratchets, and all ratchets are sequentially arranged along the length direction of the stretching surface;

the rod part limiting sleeve comprises two limiting blocking pieces which are oppositely arranged, each limiting blocking piece is connected with the bearing side face, each limiting blocking piece is provided with a blocking piece inner side face, the blocking piece inner side faces of the two limiting blocking pieces are oppositely arranged, and each blocking piece inner side face of the limiting blocking piece is perpendicular to the mounting face; the inner side surfaces of the stop pieces of the two stop pieces and the mounting surface enclose a bayonet, the inner side surface of each stop piece of the two stop pieces is provided with a stop protruding part, and the stop protruding parts of the two stop pieces are arranged oppositely; each bearing side surface, the boss connected with the bearing side surface and the connecting rod enclose a matching groove;

the sum of the height value of the table body bearing surface and the height value of the tooth part is a table tooth height value, the height value between the limiting protruding part and the mounting surface is a protruding height value, and the sum of the table tooth height value and the height value of the tooth part is smaller than the protruding height value;

the fixing sleeve comprises a sleeve body pressing plate and two positioning plates which are arranged in parallel, and two sides of the sleeve body pressing plate are respectively connected with the two positioning plates; the positioning plates are provided with plate inner side surfaces, and the plate inner side surfaces of the two positioning plates are oppositely arranged; one side of the inner side surface of each plate body, which is far away from the sleeve body pressing plate, is provided with a clamping protruding piece;

two limit blocking pieces of a rod part limit sleeve on each matching rod are respectively inserted into two matching grooves on the other matching rod, the two matching rods form a nested structure, when teeth of the two matching rods are meshed with each other, the two matching rods are sleeved by the fixed sleeve, one matching rod is pressed by the sleeve pressing plate, two bosses on the same side are pressed by each positioning plate, and two clamping protruding pieces respectively support the two bosses on the other matching rod; the connecting rods of the two rod pieces are driven to move, so that the two rod part limiting sleeves relatively move along the length direction of the rod pieces, and the bayonet of each rod part limiting sleeve of each rod piece is sleeved on the two bosses of the other rod piece.

Preferably, the inner side surface of the positioning plate is provided with a plate through hole.

Preferably, the clamping protrusion piece is provided with a clamping surface, and an included angle between the clamping surface and the inner side surface of the plate body is larger than 90 degrees.

As described above, the growth valve assembly of the present utility model has the following advantageous effects:

before the growth valve assembly is used, the two matching rods form a nested structure, and when the tooth parts of the two matching rods are meshed with each other, the two matching rods are sleeved by the fixed sleeve; the connecting rods of the two rod pieces are driven to move along the length direction, so that the two rod part limiting sleeves relatively move along the length direction of the rod pieces, and the bayonet of each rod part limiting sleeve of each rod piece is sleeved on the two bosses of the other rod piece; when the growth valve assembly is used, one rod piece of the first growth valve assembly is installed in a nail groove of a first pedicle screw, the first pedicle screw is installed on a first vertebral body which is not laterally bent, the other rod piece of the first growth valve assembly is installed in a first nail groove of a first double-head pedicle screw, and the first double-head pedicle screw is installed on a vertebral body with the largest lateral bending; one rod piece of the second growth valve assembly is installed in a second nail groove of the first double-head pedicle screw, the other rod piece of the second growth valve assembly is installed in a nail groove of the second pedicle screw, the second pedicle screw is installed on a second vertebral body which is not laterally bent, and a vertebral body with the largest lateral bending is positioned between the first vertebral body which is not laterally bent and the second vertebral body which is not laterally bent; then the fixed sleeve is detached from each growth valve component, and the fixed sleeve is separated from the corresponding two rod pieces, so that the connecting rods of the two rod pieces of each growth valve component continue to move along the length direction along with the increase of the height of a patient, so that the two rod part limiting sleeves of each growth valve component relatively move, namely the growth valve component can be automatically prolonged along with the increase of the height of the patient; the growth valve assembly of the utility model can exist in a patient for a long time, can reduce the operation times of the patient and can reduce the pain of the operation of the patient.

Drawings

Fig. 1 is a schematic perspective view showing the growth valve assembly of the present embodiment in an initial state.

Fig. 2 is a schematic side view showing a side structure of the growth valve assembly of the present embodiment in an initial state.

Fig. 3 isbase:Sub>A schematic view showingbase:Sub>A cross-sectional structure in the directionbase:Sub>A-base:Sub>A of fig. 2.

Fig. 4 is a schematic side view showing a side structure of the growth valve assembly of the present embodiment in an initial state without a fixing sleeve.

Fig. 5 is a schematic view showing a cross-sectional structure in the direction B-B of fig. 4.

Fig. 6 is a schematic view showing an exploded structure of the growth valve assembly of the present embodiment.

Fig. 7 is an enlarged schematic view of the structure at C of fig. 6.

Fig. 8 is a schematic view showing a structure of one end of the stem portion stop collar provided on the stem of the growth valve assembly according to the present embodiment.

Fig. 9 is a schematic perspective view showing the structure of the stem of the growth valve assembly of the present embodiment.

Fig. 10 is a schematic side view showing the structure of the stem of the growth valve assembly of the present embodiment.

Fig. 11 is an enlarged schematic view of the structure at D of fig. 10.

Fig. 12 is a schematic view showing the structure of the end face of the fixing sleeve of the growth valve assembly of the present embodiment.

Fig. 13 is a schematic view showing a structure of a side surface of a fixing sleeve of the growth valve assembly of the present embodiment.

Fig. 14 is a schematic perspective view showing a growth valve assembly of the present embodiment in an initial state without a fixing sleeve.

Fig. 15 is a schematic perspective view showing a growth valve assembly of the present embodiment in a limited state without a fixing sleeve.

Fig. 16 is a schematic view showing the structure of the growth valve assembly of the present embodiment mounted on a vertebral body.

Description of the reference numerals

100. Fixing sleeve

110. Cover body pressing plate

120. Positioning plate

121. Inner side of the plate body

122. Plate through hole

130. Clamping protruding piece

131. Clamping surface

200. Rod piece

210. Connecting rod

211. Rod body

212. Transition connecting part

220. Matching rod

221. Mounting surface

222. Receiving side surface

230. Rod limiting sleeve

231. Limiting stop piece

2311. Inner side surface of baffle

232. Spacing protruding portion

240. Boss

241. Supporting table top

242. Bearing surface of table body

250. Tooth part

251. Ratchet teeth

260. Matching groove

310. First pedicle screw

320. Second pedicle screw

330. Third pedicle screw

340. Fourth pedicle screw

410. First vertebral body without lateral curvature

420. Second vertebral body without lateral curvature

510. First double-head pedicle screw

520. Second double-head pedicle screw

H1 Height of the supporting surface of the table body

H2 Height of tooth

H3 Height of the protrusion

Length of L1 tooth

Length of L2 fixing sleeve

Length of L3 boss

L4 length of receiving side

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

Please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

As shown in fig. 1 to 16, the growth valve assembly of the present embodiment includes: a fixed sleeve 100 and two bars 200;

each rod member 200 comprises a connecting rod 210 and a matching rod 220, one end of the matching rod 220 is connected with the connecting rod 210, the other end of the matching rod 220 is provided with a rod part limiting sleeve 230, the axial direction of the connecting rod 210 is in the same direction as the axial direction of the matching rod 220, and the axial direction of the matching rod 220 is in the same direction as the length direction of the matching rod 220; the mating lever 220 has a mounting surface 221 and two receiving sides 222 disposed in parallel, each receiving side 222 being perpendicular to the mounting surface 221; each receiving side 222 is provided with a boss 240, the length L3 of the boss 240 is smaller than the length L4 of the receiving side 222, the boss 240 is provided with a supporting table surface 241, the supporting table surface 241 is coplanar with the mounting surface 221, the side surface of each boss 240 far away from the matching rod 220 is a table body receiving surface 242, the table body receiving surface 242 is perpendicular to the supporting table surface 241, and the supporting table surfaces 241 of the two bosses 240 and the mounting surface 221 of the matching rod 220 form a stretching surface; the stretching surface is provided with a tooth part 250, the tooth part 250 comprises a plurality of ratchets 251, and all ratchets 251 are sequentially arranged along the length direction of the stretching surface;

the rod part limiting sleeve 230 comprises two limiting baffles 231 which are oppositely arranged, each limiting baffle 231 is connected with the bearing side surface 222, each limiting baffle 231 is provided with a baffle inner side surface 2311, the baffle inner side surfaces 2311 of the two limiting baffles 231 are oppositely arranged, and the baffle inner side surface 2311 of each limiting baffle 231 is perpendicular to the mounting surface 221; the stop inner side surfaces 2311 of the two stop pieces 231 and the mounting surface 221 enclose a bayonet, the stop inner side surface 2311 of each stop piece 231 is provided with a stop protruding part 232, and the stop protruding parts 232 of the two stop pieces 231 are oppositely arranged; each receiving side 222, the boss 240 connected with the receiving side 222, and the link 210 enclose a mating slot 260;

the sum of the height H1 of the table body receiving surface 242 and the height H2 of the tooth 250 is the table tooth height; the height of the step tooth is H1 plus H2, the height between the limit projection 232 and the mounting surface 221 is the projection height H3, and the sum of the height of the step tooth and the height H2 of the tooth 250 is smaller than the projection height H3;

the fixed sleeve 100 comprises a sleeve body pressing plate 110 and two positioning plates 120 which are arranged in parallel, and two sides of the sleeve body pressing plate 110 are respectively connected with the two positioning plates 120; the locating plates 120 are provided with plate inner side surfaces 121, and the plate inner side surfaces 121 of the two locating plates 120 are oppositely arranged; one side of each plate inner side 121, which is far away from the sleeve pressing plate 110, is provided with a clamping protruding piece 130;

the two limit stoppers 231 of the rod portion limit collar 230 on each of the mating rods 220 are respectively inserted into the two mating grooves 260 on the other mating rod 220, the two mating rods 220 form a nested structure, when the teeth 250 of the two mating rods 220 are meshed with each other, the fixed collar 100 is sleeved on the two mating rods 220, the collar body pressing plate 110 presses one of the mating rods 220, each positioning plate 120 presses two bosses 240 on the same side, and the two clamping protrusions 130 respectively bear against the two bosses 240 on the other mating rod 220; the connecting rod 210 of the two rod members 200 is driven to move so that the two rod portion stoppers 230 relatively move along the length direction of the rod members 200, and the bayonet of the rod portion stopper 230 of each rod member 200 is sleeved on the two bosses 240 of the other rod member 200.

Before the growth valve assembly is used, the two matching rods 220 form a nested structure, and when the tooth parts 250 of the two matching rods 220 are meshed with each other, the two matching rods 220 are sleeved by the fixed sleeve 100; the connecting rods 210 driving the two rod pieces 200 move oppositely along the length direction, the two rod part limiting sleeves 230 move relatively, and the bayonet of the rod part limiting sleeve 230 of each rod piece 200 is sleeved on the two bosses 240 of the other rod piece 200; in use of the growth valve assembly, one of the rods 200 of the first growth valve assembly is installed in the slot of the first pedicle screw 310, the first pedicle screw 310 is installed on the first vertebral body 410 that is not laterally curved, the other rod 200 of the first growth valve assembly is installed in the first slot of the first double-ended pedicle screw 510, and the first double-ended pedicle screw 510 is installed on the vertebral body 610 that is maximally laterally curved; mounting one of the rods 200 of the second growth valve assembly in the second slot of the first double-ended pedicle screw 510, the other rod 200 of the second growth valve assembly in the slot of the second pedicle screw 320, the second pedicle screw 320 being mounted on the non-lateral curved second vertebral body 420, the most lateral curved vertebral body 610 being between the non-lateral curved first vertebral body 410 and the non-lateral curved second vertebral body 420; then the fixing sleeve 100 is detached from each growth valve assembly, and the fixing sleeve 100 is separated from the corresponding two rod pieces 200, so that the connecting rods 210 of the two rod pieces 200 of each growth valve assembly continue to move along the length direction along with the increase of the height of a patient, so that the two rod part limiting sleeves 230 of each growth valve assembly relatively move, namely the growth valve assembly can be automatically prolonged along with the increase of the height of the patient until a proper time is found for the final fusion operation; the growth valve assembly of the utility model can exist in a patient for a long time, can reduce the operation times of the patient and can reduce the pain of the operation of the patient. The growth valve assembly of the utility model is used for congenital scoliosis operation of children.

In this embodiment, when the bayonet of the rod portion stop collar 230 of each rod 200 is sleeved on the two bosses 240 of the other rod 200, the bosses 240 block the stop boss 232 from moving along the radial direction of the rod 200.

In the growth valve assembly of the present embodiment, the length L1 of the teeth 250 is greater than the length L2 of the stationary sleeve 100. The structure enables the connecting rod 210 of two rod members 200 to move along the length direction before the growth valve assembly is used, so that the two rod portion limiting sleeves 230 relatively move, and after the bayonet of the rod portion limiting sleeve 230 of each rod member 200 is sleeved on the two bosses 240 of the other rod member 200, the fixing sleeve 100 is positioned between the two rod portion limiting sleeves 230.

The growth valve assembly of the embodiment comprises a fixed sleeve 100 and two identical rod pieces 200, and has single parts, thereby being convenient for production and assembly; the growing valve assembly is assembled by adopting a 'snap-in' installation connection mode, so that the assembly time is greatly reduced, and only the bayonets of the two rods 200 are aligned with the matching grooves 260 to be matched.

After the bayonet of each rod 200 is matched with the corresponding matching groove 260, the two rod 200 can only move along the direction away from the matching groove 260 due to the mutual engagement of the teeth 250 of the two matching rods 220; the engagement of the rods 200 with the engagement grooves 260 is a "snap-fit" type of installation that greatly reduces assembly time by only aligning the two rods 200 with the engagement grooves 260.

When the fixing sleeve 100 is separated from the two rod pieces 200, the connecting rod 210 of the two rod pieces 200 is driven to move continuously along the length direction, and the two rod portion limiting sleeves 230 move relatively continuously, and the limiting protruding portion 232 can only move along the length direction of the connecting rod 210 because the bayonet of the rod portion limiting sleeve 230 of each rod piece 200 is sleeved on the two bosses 240 of the other rod piece 200, and the bosses 240 block the limiting protruding portion 232 from moving along the radial direction of the rod piece 200; the bayonet is assembled with the boss 240 to form a stop mechanism.

After the two ends of the growth valve assembly are matched with the spinal column, the fixing sleeve 100 is pulled out, and the automatic expansion can be realized only by applying axial pulling force to the two rod pieces 200.

The joint of the two rods 200 is matched by the ratchet 251, so that the relative sliding and relative rotation between the two rods 200 are limited, each rod 200 can only move along the direction away from the matching groove 260, and the reverse stroke of the growth valve assembly is prevented; simultaneously, the rigid connection of the ratchet 251 enables the two rod members 200 to bear axial pressure, and the two rod members 200 are more firmly matched.

When each bar 200 moves in a direction away from the engagement groove 260 and the teeth 250 of the two bars 200 are disengaged, one of the engagement bars 220 moves in a direction away from the other engagement bar 220 by a distance of the height H2 of the teeth 250, and the sum of the value of the tooth height and the value of the height H2 of the teeth 250 is smaller than the value of the protrusion height H3, stable movement of the bars 200 can be ensured, preventing the bars 200 from being caught in the bayonet.

The two latching protrusions 130 respectively abut against the two bosses 240 on the other mating lever 220, and at this time, the bosses 240 restrict the radial movement of the latching protrusions 130 along the lever 200.

In this embodiment, the ratchet 251 is a unidirectional ratchet 251; due to the limitation of the bayonet, the boss 240 and the unidirectional ratchet 251, the two rods 200 of the growth valve assembly can only perform unidirectional displacement, i.e., the distance between the two ends of the growth valve assembly can only be increased until the rod portion stop collars 230 of the two rods 200 are in contact.

The plate through hole 122 is arranged on the inner side 121 of the positioning plate 120, and the plate through hole 122 extends to one side of the positioning plate 120 far away from the sleeve pressing plate 110. The provision of the plate through-holes 122 facilitates the removal of the fixing sleeve 100.

The clamping protrusion 130 is provided with a clamping surface 131, and an included angle E between the clamping surface 131 and the inner side 121 of the plate body is larger than 90 degrees. This structure facilitates the disassembly and assembly of the fixing sleeve 100.

In order to make the structure of the lever 200 more compact, the connecting rod 210 includes a lever body 211 and a transition connection part 212, one end of the transition connection part 212 is connected to the lever body 211, and the other end of the transition connection part 212 is connected to the mating lever 220. The lever body 211 has a cylindrical structure.

For ease of installation, the length of the notch of the mating groove 260 is greater than the length of the limit stop 231 of the stem stop 230; the distance between the limit protrusions 232 of the two limit stops 231 is smaller than the distance between the two support body receiving surfaces 242, and the distance between the limit protrusions 232 of the two limit stops 231 is larger than the distance between the two receiving side surfaces 222; the distance between the stop inner sides 2311 of the two stop stops 231 is greater than the distance between the two table body receiving surfaces 242.

The application method of the growth valve assembly of the embodiment includes four growth valve assemblies, wherein the four growth valve assemblies are respectively a first growth valve assembly, a second growth valve assembly, a third growth valve assembly and a fourth growth valve assembly, and the application method comprises the following steps:

1) One of the rods 200 of the first growth valve assembly is installed in the slot of the first pedicle screw 310, the first pedicle screw 310 is installed on the first vertebral body 410 that is not laterally bent, the other rod 200 of the first growth valve assembly is installed in the first slot of the first double-ended pedicle screw 510, and the first double-ended pedicle screw 510 is installed on the vertebral body 610 that is maximally laterally bent; mounting one of the rods 200 of the second growth valve assembly in the second slot of the first double-ended pedicle screw 510, the other rod 200 of the second growth valve assembly in the slot of the second pedicle screw 320, the second pedicle screw 320 being mounted on the non-lateral curved second vertebral body 420, the most lateral curved vertebral body 610 being between the non-lateral curved first vertebral body 410 and the non-lateral curved second vertebral body 420;

2) One rod 200 of the third growth valve assembly is installed in the slot of the third pedicle screw 330, the third pedicle screw 330 is installed on the first vertebral body 410 that is not laterally bent, the other rod 200 of the third growth valve assembly is installed in the first slot of the second double-headed pedicle screw 520, and the second double-headed pedicle screw 520 is installed on the vertebral body 610 that is maximally laterally bent; one rod 200 of the fourth growth valve assembly is installed in the second slot of the second bi-level pedicle screw 520, the other rod 200 of the fourth growth valve assembly is installed in the slot of the fourth pedicle screw 340, and the fourth pedicle screw 340 is installed on the second vertebral body 420 without lateral curvature.

The unidirectional expansibility of the growth valve assembly of the present embodiments enables the growth valve assembly to exist in a patient for a long period of time and to automatically lengthen as the patient's height increases until an expansion limit is reached; the growth valve assembly of the embodiment is passive equipment, has simple structure and convenient operation, can automatically expand and adjust, effectively prevents the equipment from moving reversely, can avoid multiple operations and reduces the damage of the spine. The use method of the growth valve assembly of the embodiment can keep the growth potential and avoid deformity aggravation caused by vertebral body rotation. When the growth valve component of the embodiment is matched with the pedicle screw, the connecting rod of the rod piece is directly placed into the nail groove, which is beneficial for the implantation of the growth valve component into a human body.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (3)

1. A growth valve assembly, comprising: a fixed sleeve (100) and two rods (200);

each rod piece (200) comprises a connecting rod (210) and a matching rod (220), one end of the matching rod (220) is connected with the connecting rod (210), a rod part limiting sleeve (230) is arranged at the other end of the matching rod (220), the axial direction of the connecting rod (210) is in the same direction as the axial direction of the matching rod (220), and the axial direction of the matching rod (220) is in the same direction as the length direction of the matching rod (220); the matching rod (220) is provided with a mounting surface (221) and two parallel bearing side surfaces (222), and each bearing side surface (222) is perpendicular to the mounting surface (221); each supporting side surface (222) is provided with a boss (240), the length of each boss (240) is smaller than that of each supporting side surface (222), each boss (240) is provided with a supporting table surface (241), each supporting table surface (241) is coplanar with each mounting surface (221), the side surface, far away from each matching rod (220), of each boss (240) is a table body supporting surface (242), each table body supporting surface (242) is perpendicular to each supporting table surface (241), and the supporting table surfaces (241) of the two bosses (240) and the mounting surfaces (221) of the corresponding matching rods (220) form a stretching surface; the stretching surface is provided with a tooth part (250), the tooth part (250) comprises a plurality of ratchets (251), and all ratchets (251) are sequentially arranged along the length direction of the stretching surface;

the rod part limiting sleeve (230) comprises two limiting baffle pieces (231) which are oppositely arranged, each limiting baffle piece (231) is connected with the bearing side face (222), each limiting baffle piece (231) is provided with a baffle piece inner side face (2311), the baffle piece inner side faces (2311) of the two limiting baffle pieces (231) are oppositely arranged, and the baffle piece inner side faces (2311) of each limiting baffle piece (231) are perpendicular to the mounting face (221); the inner side surfaces (2311) of the two limiting baffles (231) and the mounting surface (221) are surrounded to form a bayonet, limiting protruding portions (232) are arranged on the inner side surface (2311) of each limiting baffle (231), and the limiting protruding portions (232) of the two limiting baffles (231) are arranged oppositely; -each of the receiving sides (222), the boss (240) connected to the receiving side (222) and the connecting rod (210) enclose a mating slot (260);

the sum of the height value of the table body bearing surface (242) and the height value of the tooth part (250) is a table tooth height value, the height value between the limit protruding part (232) and the mounting surface (221) is a protruding height value, and the sum of the table tooth height value and the height value of the tooth part (250) is smaller than the protruding height value;

the fixing sleeve (100) comprises a sleeve body pressing plate (110) and two positioning plates (120) which are arranged in parallel, and two sides of the sleeve body pressing plate (110) are respectively connected with the two positioning plates (120); the positioning plates (120) are provided with plate inner side surfaces (121), and the plate inner side surfaces (121) of the two positioning plates (120) are oppositely arranged; a clamping protruding piece (130) is arranged on one side, far away from the sleeve pressing plate (110), of each plate inner side (121);

two limit stops (231) of a rod part limit sleeve (230) on each matching rod (220) are respectively inserted into two matching grooves (260) on the other matching rod (220), the two matching rods (220) form a nested structure, when teeth (250) of the two matching rods (220) are meshed with each other, the fixed sleeve (100) is sleeved on the two matching rods (220), the sleeve body pressing plate (110) presses one matching rod (220), each positioning plate (120) presses two bosses (240) on the same side, and the two clamping protrusions (130) respectively support the two bosses (240) on the other matching rod (220); the connecting rods (210) of the two rod pieces (200) are driven to move, so that the two rod part limiting sleeves (230) relatively move along the length direction of the rod pieces (200), and the bayonet of each rod part limiting sleeve (230) of each rod piece (200) is sleeved on the two bosses (240) of the other rod piece (200).

2. A growth valve assembly according to claim 1, wherein: a plate through hole (122) is formed in the inner side surface (121) of the positioning plate (120).

3. A growth valve assembly according to claim 1, wherein: the clamping protrusion piece (130) is provided with a clamping surface (131), and an included angle between the clamping surface (131) and the inner side surface (121) of the plate body is larger than 90 degrees.

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