Soft tissue expander and inner cannula thereof

Abstract

The present invention relates to a soft tissue expander and an inner sleeve thereof, comprising an inner sleeve and an outer sleeve, the inner sleeve comprising a tube body, a first clamping hole being provided at the head end of the tube body, the tube body being provided with at least one inner core clamping component and at least one positioning component, the inner core clamping component being provided with a second clamping hole, the positioning component being provided with a third clamping hole, the third clamping hole being coaxially arranged with the first clamping hole, and the second clamping hole being non-coaxially arranged with the first clamping hole and the third clamping hole. The inner sleeve of the soft tissue expander of the present invention has a small wall thickness, which is conducive to production, reduces costs, and improves product quality. At the same time, due to the reduced wall thickness of the inner sleeve, the weight of the product is reduced, the doctor's user experience is improved, the user safety is improved, and the patient's health is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a soft tissue expander and an inner sleeve thereof. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, patent CN201910865237.9 discloses a soft tissue expander, which is simple and easy to use. During the use of the soft tissue expander, the outer diameter of the inner core and the outer diameter of the inner sleeve are quite different. According to the implementation method in the above patent, the wall thickness of the inner sleeve is too thick. During production, for example, injection molding is used, resulting in a low pass rate. Moreover, the thick wall thickness of the inner sleeve makes the whole piece too heavy, which is inconvenient for doctors to use and may even cause operational errors, resulting in intraoperative injuries or even life-threatening. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an inner sleeve structure for a soft tissue expander, which can reduce the wall thickness of the inner sleeve while ensuring the outer diameter of the inner sleeve, thereby improving the qualified rate during the production of the inner sleeve.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions

[0006] In the first aspect, an embodiment of the present invention provides a soft tissue expander, comprising an inner sleeve and an outer sleeve, the inner sleeve comprising a tube body, a first clamping hole being provided at the head end of the tube body, the tube body being provided with at least one inner core clamping component and at least one positioning component, the inner core clamping component being provided with a second clamping hole, the positioning component being provided with a third clamping hole, the third clamping hole being coaxially arranged with the first clamping hole, and the second clamping hole being non-coaxially arranged with the first clamping hole and the third clamping hole.

[0007] Optionally, the inner core clamping component is arranged at the tail end of the tube body, and the positioning component is arranged inside the tube body.

[0008] Optionally, the positioning component is provided inside the tube body, and the positioning component and the tube body are provided integrally;

[0009] Alternatively, the positioning component and the tube body are arranged separately, the positioning component is in contact with the tube surface inside the tube body, and a first limiting structure and a second limiting structure are provided in the tube body. The first limiting structure contacts the tail end face of the positioning component, and the second limiting structure contacts the head end face of the positioning component. The positioning component is fixed in the tube body by the first limiting structure and the second limiting structure.

[0010] Optionally, the tube body includes a first tube portion and a second tube portion, the first tube portion and the second tube portion are spliced ​​together to form the tube body, the head end of the first tube portion is provided with a first clamping hole, the tail end is connected to the head end of the second tube portion, and the tail end of the second tube portion is provided with an inner core clamping component.

[0011] Optionally, a slot is provided at the tail end of the first tube part, the head end of the second tube part is inserted into the slot and fixed to the first tube part, and the outer tube surfaces of the first tube part and the second tube part are flush.

[0012] Optionally, when the positioning component and the tube body are arranged separately, an annular boss is provided on the inner tube surface of the second tube part to form a first limiting structure that contacts the tail end face of the positioning component, and the end face of the first tube part forms a second limiting structure that contacts the head end face of the positioning component.

[0013] Optionally, the second tube portion is provided with a rib, which passes through the positioning component and is inserted into a limiting groove provided at the tail end of the first tube portion to achieve circumferential positioning of the first tube portion, the second tube portion and the positioning component along the tube body.

[0014] Optionally, the positioning component is arranged inside the tube body, and the positioning component divides the cavity inside the tube body. The head end of the tube body is provided with at least one pressure reducing hole, and the pressure reducing hole is connected to the internal space of the tube body. Accordingly, the positioning component is provided with a pressure reducing channel that connects the tube spaces on both sides thereof.

[0015] Optionally, the end face of the head end of the outer sleeve forms a set acute angle with a vertical plane of the axis of the outer sleeve.

[0016] Optionally, the inner sleeve is provided with a first clamping portion, and the outer sleeve is provided with a second clamping portion for cooperating with the first clamping portion;

[0017] The first clamping portion is provided with a clamping groove that cooperates with the second clamping portion so that the second clamping portion can be clamped into the clamping groove in a manner that the inner sleeve and the outer sleeve rotate relative to each other;

[0018] Alternatively, the second clamping portion is provided with a clamping groove that cooperates with the first clamping portion so that the first clamping portion can be clamped into the clamping groove in a manner that the inner sleeve and the outer sleeve rotate relative to each other;

[0019] Alternatively, the second clamping portion is provided with a fixing hole, and the first clamping portion is provided with a clamping head assembly, which matches the clamping hole so that the clamping head assembly can be clamped into the fixing hole along the axis direction of the inner sleeve and the outer sleeve;

[0020] Alternatively, the second clamping portion is provided with a clamping head assembly, the first clamping portion is provided with a fixing hole, and the clamping head assembly matches the clamping hole so that the clamping head assembly can be clamped into the fixing hole along the axis direction of the inner sleeve and the outer sleeve.

[0021] Optionally, when the first clamping portion is provided with a clamping head assembly, the first clamping portion is provided with a slot, and the clamping head assembly includes a first clamping head and a second clamping head respectively located on both sides of the slot; when the second clamping portion is provided with a clamping head assembly, the second clamping portion is provided with a slot, and the clamping head assembly includes a first clamping head and a second clamping head respectively located on both sides of the slot.

[0022] Optionally, the axis of the fixing hole is arranged parallel to the axes of the outer sleeve and the inner sleeve.

[0023] In the second aspect, an embodiment of the present invention provides an inner sleeve of a soft tissue expander, comprising a tube body, a first clamping hole being provided at the head end of the tube body, the tube body being provided with at least one inner core clamping component and at least one positioning component, the inner core clamping component being provided with a second clamping hole, the positioning component being provided with a third clamping hole, the third clamping hole being coaxially arranged with the first clamping hole, and the second clamping hole being non-coaxially arranged with the first clamping hole and the third clamping hole.

[0024] Beneficial effects of the present invention:

[0025] 1. In the soft tissue expander of the present invention, the third engaging hole is coaxially arranged with the first engaging hole, and the second engaging hole is non-coaxially arranged with the first engaging hole and the third engaging hole, forming at least three engaging points that are not in a straight line. This realizes the function of clamping the inner core, reduces the inner diameter requirement of the inner cannula, and can reduce the wall thickness of the inner cannula, which is beneficial to production, reduces costs, and improves product quality. At the same time, due to the reduced wall thickness of the inner cannula, the weight of the product is reduced, which improves the doctor's user experience, enhances user safety, and protects the health of patients.

[0026] 2. The soft tissue expander of the present invention has a pressure-reducing hole, and the positioning component has a pressure-reducing channel. The pressure-reducing hole is connected to the internal space of the tube body. When used for intracranial tissue expansion, when the inner cannula is pushed into the skull along the inner core, intracranial blood or cerebrospinal fluid can enter the inner cannula through the pressure-reducing hole and overflow from the tail end of the inner cannula, allowing the liquid to be discharged from the skull, reducing the increase in intracranial pressure caused by the expander being placed in the skull, and at the same time alleviating the patient's own intracranial hypertension symptoms, avoiding endangering the patient's health when the soft tissue expander is placed in the skull.

[0027] 3. The soft tissue expander of the present invention has a beveled outer sleeve head end, which expands the doctor's operating range and improves the surgical effect without increasing the diameter of the outer sleeve.

[0028] 4. The soft tissue expander of the present invention has a clamping head assembly that can be clamped into the clamping hole along the axis of the inner sleeve and the outer sleeve, which is convenient for doctors to operate, less likely to cause mistakes, and reduces the processing and design requirements for the inner sleeve and the outer sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0030] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0031] Figure 2 This is a cross-sectional view of the overall structure of Example 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the overall structure of the inner sleeve in Example 1 of the present invention;

[0033] Figure 4 This is a schematic structural diagram of the second pipe portion of Example 1 of the present invention;

[0034] Figure 5 Schematic diagram of the positioning component structure of embodiment 1 of the present invention Figure 1 ;

[0035] Figure 6 Schematic diagram of the positioning component structure of embodiment 1 of the present invention Figure 2 ;

[0036] Figure 7 This is a schematic structural diagram of the first pipe portion of Example 1 of the present invention;

[0037] Figure 8 This is a schematic diagram of the outer sleeve structure of Example 1 of the present invention;

[0038] Among them, 1. the second tube part, 2. the first tube part, 3. the inner core clamping part, 4. the second clamping hole, 5. the slot, 6. the first clamping hole, 7. the pressure reducing hole, 8. the second clamping part, 9. the pressure reducing channel, 10. the outer sleeve, 11. the fixing tube, 12. the annular boss, 13. the positioning tube, 14. the transition tube, 15. the third clamping hole, 16. the rib, 17. the limiting groove, 18. the first clamping part, 19. the inner core, 20. the bevel surface, 21. the fixing hole, 22. the first clamping head, 23. the second clamping head, 24. the protrusion, 25. the slot, 26. the elastic hole, 27. the anti-deflection clamping head, 28. the anti-deflection slot. DETAILED DESCRIPTION

[0039] For the convenience of description, the "tail end" in this embodiment refers to the end close to the operator as the tail end and the end away from the operator as the head end during actual surgery from the operator's perspective.

[0040] Example 1

[0041] This embodiment provides a soft tissue expander, such as Figure 1-Figure 2As shown, it includes an inner sleeve and an outer sleeve sleeved outside the inner sleeve, the inner sleeve includes a tube body, the inner diameter of the tube body is larger than the outer diameter of the inner core, the tube body is made of PC material, the cross-section of the tube body is circular, square or elliptical, and correspondingly, the cross-section of the outer sleeve is circular or elliptical. In this embodiment, the cross-section of the tube body is circular, and the cross-sectional area of ​​the tail end of the tube body is larger than the cross-sectional area of ​​the head end, forming a conical structure, which is convenient for insertion into human tissue. Accordingly, the outer sleeve is also a conical structure.

[0042] The head end of the tube body is provided with a card hole as the first card hole, the inner core can pass through the first card hole, the first card hole forms a card connection point for the inner core, the inner core is a brain puncture needle or a visual brain puncture needle or other surgical instruments, the tail end of the tube body is provided with an inner core card connection component, the inner core card connection component is provided with a card hole, which is the second card hole. It can be understood that the inner core card connection component can also be provided with multiple, the second card hole is used to pass through the inner core, the second card hole forms a second card connection point for the inner core, and at least one positioning component is provided inside the tube body. The positioning component and the tube body are integrally provided or separately provided. The positioning component divides the internal space of the tube body, and the positioning component is provided with a clamping hole, which is a third clamping hole. The third clamping hole is used to pass the inner core, and the third clamping hole forms at least one third clamping point on the inner core, wherein the first clamping hole and the third clamping hole are coaxially arranged for positioning the inner core, and the second clamping hole is non-coaxially arranged with the first clamping hole and the third clamping hole for clamping the inner core, thereby forming at least three clamping points that are not on the same straight line. After the inner core passes through the first clamping hole and the third clamping hole, the inner core clamping part can apply a clamping force to the inner core through the second clamping hole to clamp the inner core.

[0043] It can be understood that the positioning component can be set inside the tube body or outside the tube body, and the inner core clamping component can be set inside the tube body or outside the tube body. In this embodiment, the positioning component is set inside the tube body, and the inner core clamping component is set outside the tube body.

[0044] The tube body includes a second tube part 2 and a first tube part 1. The tail end of the second tube part 2 is provided with a connecting part, and the connecting part is provided with an inner core clamping component 3 extending radially along the second tube part 2. The inner core clamping component 3 adopts a plate-like structure and is provided with a second clamping hole 4.

[0045] The head end of the second tube part 2 is fixedly connected to the tail end of the first tube part 1 to form the entire tube body.

[0046] Specifically, such as Figure 3-Figure 4 As shown, a slot 5 is provided on the outer edge of the tail end face of the first tube portion 1. The radial dimension of the slot 5 along the first tube portion 1 is equal to the wall thickness of the second tube portion 2. The head end of the second tube portion 2 is inserted into the slot 5 and fixed to the first tube portion 1 to form the entire tube body structure. Since the notch dimension of the slot 5 along the radial direction of the first tube portion 1 is equal to the wall thickness of the second tube portion 2, the outer tube surfaces of the second tube portion 2 and the first tube portion 1 are flush.

[0047] The head end of the first tube portion 1 is a convex structure such as a hemispherical structure or a hemispherical structure, which reduces damage to human tissue when inserted into human tissue.

[0048] In this embodiment, the head end of the first tube portion 1 adopts a semi-ellipsoidal structure, and the first clamping hole 6 is arranged at the center of the semi-ellipsoidal structure.

[0049] During intracranial surgery, the first clamping hole 6 of the soft tissue expander is blocked by the inner core. Therefore, after placement into the skull, it can cause increased intracranial pressure, which can seriously endanger the patient's life and health. Therefore, a pressure relief hole 7 is provided at the tip of the first tube portion 1. The pressure relief hole 7 is provided on the wall of the semi-ellipsoidal structure at the tip of the first tube portion 1. The axis of the pressure relief hole 7 is parallel to the axis of the first tube portion 1, and the pressure relief hole 7 is connected to the interior space of the tube body.

[0050] One or more pressure reducing holes 7 are provided. When multiple pressure reducing holes 7 are provided, the pressure reducing holes 7 are arranged at equal intervals along the circumference, and the center of the circumference is located on the axis of the first tube part 1 .

[0051] In this embodiment, two pressure-reducing holes 7 are provided, and the two pressure-reducing holes 7 are symmetrically arranged relative to the first clamping hole 6 .

[0052] In this embodiment, a positioning component is provided. The positioning component is provided at the connection position between the first tube portion 1 and the second tube portion 2. A part of the positioning component is located inside the first tube portion 1, and the other part is located inside the second tube portion 2. The positioning component divides the space inside the tube body into two spaces, one side of which is the internal space of the first tube portion 1, and the other side is the internal space of the second tube portion 2.

[0053] In order to cooperate with the pressure reducing hole 7 , a pressure reducing channel 9 is provided on the positioning component, and the pressure reducing channel 9 connects the space of the first tube part 1 with the space of the second tube part 2 .

[0054] During use, when the inner cannula is pushed into the skull along the inner core, intracranial blood or cerebrospinal fluid can enter the first tube part 1 through the decompression hole 7, then enter the second tube part 2 through the decompression channel 9, and finally overflow from the tail end of the second tube part 2.

[0055] like Figure 5-Figure 6As shown, the positioning component and the tube body are arranged in a split type, and the positioning component includes a fixing part and a partition part. The fixing part adopts a fixing tube 11, and the head end of the fixing tube 11 is fitted with the part other than the slot 5 of the end face of the first tube part 1. The first tube part 1 forms a second limiting structure for limiting the head end of the fixing tube 11, and the tail end of the fixing tube 11 is fitted with the annular boss 12 set on the inner side surface of the second tube part 2. The annular boss 12 is used to limit the tail end of the fixing tube 11 to form a first limiting structure. The outer tube surface of the fixing tube 11 is fitted with the inner tube surface of the second tube part 2 to radially limit the fixing tube 11, thereby realizing the fixation of the positioning component inside the tube body.

[0056] The partition adopts a positioning tube 13, the tail end of the positioning tube 13 extends into the interior of the fixed tube 11, and is fixed to the tail end of the fixed tube 11 through an inverted cone-shaped transition tube 14. The head end of the positioning tube 13 extends into the interior of the first tube part 1. The internal space of the positioning tube 13 is an inverted cone-shaped cavity with open ends. The open end of the head end forms a third clamping hole 15 for clamping the inner core. By setting the inverted cone-shaped cavity, the installation of the inner core is facilitated.

[0057] Since the inner core blocks the third clamping hole 15 , the partitioning portion divides the internal space of the tube body.

[0058] The decompression channel 9 is arranged on the side of the positioning component and along the axial direction of the positioning component to connect the spaces inside the tube body on both sides of the positioning component.

[0059] In this embodiment, Figure 7 As shown, to circumferentially position the first tube portion 1, the second tube portion 2, and the positioning member, a rib 16 is provided on the leading end face of the annular boss 12 of the second tube portion 2. Rib 16 passes through the positioning member via the pressure-reducing channel 9 and then extends into a retaining groove 17 provided on the trailing end face of the first tube portion 1, thereby achieving circumferential positioning of the first tube portion 1, the second tube portion 2, and the positioning member. The width of rib 16 is smaller than the width of the pressure-reducing channel to avoid obstructing liquid flow. Therefore, the circumferential positioning of the positioning member can only be approximate.

[0060] The tail end of the second tube portion 2 is also fixed with a first clamping portion 18 extending radially along the first tube portion through a connecting portion, and the first clamping portion 18 is used to be fixed to the outer sleeve. The first clamping portion 18 is closer to the head end of the second tube portion 2 than the inner core clamping component 3.

[0061] In this embodiment, the inner core clamping component 3 is first pinched so that the first clamping hole 6, the second clamping hole 4 and the third clamping hole 15 are coaxially arranged, and then the inner core 19 is passed through the first clamping hole 6, the second clamping hole 4 and the third clamping hole 15, the inner core clamping component 3 is loosened, the inner core clamping component 3 is restored to its original position, and then the inner core 19 is clamped through the second clamping hole 4.

[0062] The function of clamping the inner core 19 is achieved by three clamping points that are not in a straight line, which reduces the inner diameter requirement of the inner cannula and can reduce the wall thickness of the inner cannula, which is beneficial to production, reduces costs, and improves product quality. At the same time, since the wall thickness of the inner cannula is reduced, the weight of the product is reduced, the doctor's experience of use is improved, the safety of use is increased, and the health of patients is protected.

[0063] The outer sleeve 10 is sleeved on the outer periphery of the inner sleeve, and the length of the outer sleeve 10 is smaller than that of the inner sleeve. Figure 8 As shown, the end face of the head end of the outer sleeve 10 forms a set acute angle with the vertical plane of the outer sleeve axis, forming a bevel surface 20. When in use, the bevel surface 20 faces the operating surface. Without expanding the cross-section of the outer sleeve, the bevel surface 20 expands the doctor's operating range and improves the surgical effect. The degree of the acute angle is set to 10°-30°, which not only ensures the effect of expanding the range, but also does not affect the outer sleeve's support for surrounding tissues.

[0064] The tail end of the outer sleeve is provided with a second clamping portion 8, and a fixing hole 21 is provided on the second clamping portion 8. The fixing hole 21 is a rectangular hole, and its axis is parallel to the axis of the inner sleeve and the outer sleeve 10. A clamping head assembly is provided on the first clamping portion 18, and the clamping head assembly cooperates with the fixing hole 21 so that the clamping head assembly can be clamped into the fixing hole along the axial direction of the inner sleeve and the outer sleeve.

[0065] In this embodiment, the clamping head assembly includes a first clamping head 22 and a second clamping head 23. After the first clamping head 22 and the second clamping head 23 are clamped into the fixing hole 21, they can fit with the two opposite side surfaces of the fixing hole 21, wherein the end of the first clamping head 22 is provided with a protrusion 24. Accordingly, the fixing hole 21 adopts a stepped hole, and the protrusion 24 can contact the stepped surface of the fixing hole 21 to prevent the first clamping head 22 and the second clamping head 23 from detaching from the fixing hole 21. Moreover, the stepped hole can prevent the protrusion 24 from protruding from the head end surface of the second clamping portion 8. The edge of the fixing hole 21 for contacting the first clamping head 22 and the second clamping head 23 is provided with an inclined surface, and the distance between the tail end of the inclined surface and the axis of the fixing hole 21 is greater than the distance between the head end and the axis of the fixing hole 21 so that the first clamping head 22 and the second clamping head 34 contact with the inclined surface and during the insertion process, the inclined surface can exert a force on the first clamping head 22 and the second clamping head 23 to move closer to each other, making it convenient for the first clamping head 22 and the second clamping head 23 to be clamped into the fixing hole 21.

[0066] A slot 25 is provided on the first clamping portion 18, and the first clamping head 22 and the second clamping head 23 are respectively located on both sides of the slot 25. One end of the slot 25 extends to the outer side surface of the first clamping portion 18, and the other end is connected to the elastic hole 26. The elastic hole 26 widens toward the direction of the first clamping head 22, further facilitating the relative displacement of the first clamping portion 18 on both sides of the slot 25, thereby facilitating operation.

[0067] In order to prevent the first clamping parts 18 on both sides of the slot 25 from being deformed or broken due to excessive vertical displacement deviation when the first clamping parts 18 are partially pinched, an anti-deflection clamping head 27 is provided on the side groove surface of the slot close to the first clamping head, and an anti-deflection clamping groove 28 matching the anti-deflection clamping head is provided on the other side groove surface.

[0068] In another embodiment, a fixing hole is provided on the first clamping portion, and a clamping head assembly is provided on the second clamping portion. The clamping head assembly and the fixing hole are provided in the same manner as described above and are not described in detail here.

[0069] When securing the inner and outer sleeves of this embodiment, the first and second clamping portions are moved along the axes of the inner and outer sleeves, causing the clamp assembly to engage with the fixing hole, thereby securing the inner and outer sleeves. This method is less likely to cause physician errors and eliminates the need for circular cross-sections of the inner and outer sleeves, facilitating their manufacture.

[0070] In the third embodiment, the setting form of the first clamping portion and the second clamping portion is the same as that in patent CN201910865237.9.

[0071] In a fourth embodiment, the second clamping portion is provided with a clamping groove that cooperates with the first clamping portion so that the first clamping portion can be clamped into the clamping groove in a manner that the inner sleeve and the outer sleeve are relatively rotated.

[0072] The method of using the soft tissue expander of this embodiment differs from the method of using the soft tissue expander disclosed in CN201910865237.9 only in the fixing method of the inner sleeve and the outer sleeve and the fixing method of the inner core. The other steps can adopt the method steps described in patent CN201910865237.9 and will not be described in detail here.

[0073] After the outer sleeve is placed in the human tissue to establish a channel, the doctor rotates the outer sleeve so that it rotates around its own axis, facing the bevel surface to the operating surface such as the hematoma surface, fully exposing the lesion, and then performing the corresponding surgical operation.

[0074] Example 2

[0075] The present embodiment provides an inner sleeve of a soft tissue expander, comprising a tube body, a first clamping hole 6 provided at the head end of the tube body, an inner core capable of passing through the first clamping hole 6, the first clamping hole 6 forming a clamping point for the inner core, the inner core being a brain puncture needle or a visual brain puncture needle or other surgical instrument, an inner core clamping component 3 provided at the tail end of the tube body, a clamping hole provided on the inner core clamping component, the second clamping hole 4 being provided, a plurality of inner core clamping components can be provided, the second clamping hole 4 being used to pass through the inner core, the second clamping hole 4 forming a second clamping point for the inner core, at least one positioning component being provided inside the tube body, The positioning component divides the internal space of the tube body. The positioning component is provided with a clamping hole, which is a third clamping hole 15. The third clamping hole 15 is used to pass through the inner core. The third clamping hole 15 forms at least one third clamping point for the inner core, wherein the first clamping hole 6 and the third clamping hole 15 are coaxially arranged, and the second clamping hole 4 is non-coaxially arranged with the first clamping hole 6 and the third clamping hole 15, thereby forming at least three clamping points that are not on the same straight line. After the inner core passes through the first clamping hole 6 and the third clamping hole 15, the inner core clamping component 3 can apply a clamping force to the inner core through the second clamping hole 4 to clamp the inner core.

[0076] The other structures of the inner sleeve are the same as those of the inner sleeve in Example 1 and will not be repeated here.

[0077] In this embodiment, the inner core 19 is secured to the inner cannula by first squeezing the inner core engaging member 3 so that the first engaging hole 6, the second engaging hole 4, and the third engaging hole 15 are as coaxial as possible. The inner core 19 is then inserted through the three engaging holes, the inner core engaging member 3 is released, and the inner core 19 is secured by engaging the second engaging hole 4. The remaining steps for using the soft tissue expander are not described in detail here.

[0078] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A soft tissue expander, comprising an inner cannula and an outer cannula, characterized in that: The inner sleeve includes a tube body, a first clamping hole is provided at the head end of the tube body, the tube body is provided with at least one inner core clamping component and at least one positioning component, the inner core clamping component is provided with a second clamping hole, the positioning component is provided with a third clamping hole, the third clamping hole is coaxially arranged with the first clamping hole, and the second clamping hole is non-coaxially arranged with the first clamping hole and the third clamping hole; The positioning component is separately provided with the tube body, and the positioning component is in contact with the tube surface inside the tube body. A first limiting structure and a second limiting structure are provided inside the tube body. The first limiting structure contacts the tail end surface of the positioning component, and the second limiting structure contacts the head end surface of the positioning component. The positioning component is fixed in the tube body by the first limiting structure and the second limiting structure. The positioning component is arranged inside the tube body, and the positioning component divides the cavity inside the tube body. The head end of the tube body is provided with at least one pressure reducing hole, which is connected to the internal space of the tube body. Correspondingly, the positioning component is provided with a pressure reducing channel that connects the tube spaces on both sides thereof.

2. A soft tissue expander according to claim 1, characterized in that: The inner core clamping component is arranged at the tail end of the tube body, and the positioning component is arranged inside the tube body.

3. The soft tissue expander according to claim 1, characterized in that: The tube body includes a first tube part and a second tube part, which are spliced ​​together to form the tube body. The head end of the first tube part is provided with a first clamping hole, and the tail end is connected to the head end of the second tube part. The tail end of the second tube part is provided with an inner core clamping component.

4. A soft tissue expander according to claim 3, characterized in that: A slot is provided at the tail end of the first tube part, the head end of the second tube part is inserted into the slot and fixed to the first tube part, and the outer tube surfaces of the first tube part and the second tube part are flush.

5. The soft tissue expander according to claim 3, characterized in that: The second tube portion is provided with ribs, which pass through the positioning component and are inserted into the limiting grooves provided at the tail end of the first tube portion to achieve circumferential positioning of the first tube portion, the second tube portion and the positioning component along the tube body.

6. The soft tissue expander according to claim 1, characterized in that: The end face of the head end of the outer sleeve forms a set acute angle with a vertical plane of the axis of the outer sleeve.

7. The soft tissue expander according to claim 1, characterized in that: The inner sleeve is provided with a first clamping portion, and the outer sleeve is provided with a second clamping portion for cooperating with the first clamping portion; The first clamping portion is provided with a clamping groove that cooperates with the second clamping portion so that the second clamping portion can be clamped into the clamping groove in a manner that the inner sleeve and the outer sleeve rotate relative to each other; Alternatively, the second clamping portion is provided with a clamping groove that cooperates with the first clamping portion so that the first clamping portion can be clamped into the clamping groove in a manner that the inner sleeve and the outer sleeve rotate relative to each other; Alternatively, the second clamping portion is provided with a fixing hole, and the first clamping portion is provided with a clamping head assembly, which matches the clamping hole so that the clamping head assembly can be clamped into the fixing hole along the axis direction of the inner sleeve and the outer sleeve; Alternatively, the second clamping portion is provided with a clamping head assembly, the first clamping portion is provided with a fixing hole, and the clamping head assembly matches the clamping hole so that the clamping head assembly can be clamped into the fixing hole along the axis direction of the inner sleeve and the outer sleeve.

8. A soft tissue expander according to claim 7, characterized in that When the first clamping portion is provided with a clamping head assembly, the first clamping portion is provided with a slot, and the clamping head assembly includes a first clamping head and a second clamping head respectively located on both sides of the slot; when the second clamping portion is provided with a clamping head assembly, the second clamping portion is provided with a slot, and the clamping head assembly includes a first clamping head and a second clamping head respectively located on both sides of the slot.

9. The soft tissue expander according to claim 7, characterized in that: The axis of the fixing hole is arranged parallel to the axes of the outer sleeve and the inner sleeve.

10. A soft tissue expander inner cannula, characterized in that: The invention comprises a tube body, a first clamping hole is provided at the head end of the tube body, an inner core clamping portion is provided at the tube body, a second clamping hole is provided at the inner core clamping portion, at least one positioning component is provided at the tube body, and the positioning component is provided with a third clamping hole. Among the plurality of clamping holes, at least two clamping holes are coaxially arranged for positioning the inner core, and the remaining clamping holes are non-coaxially arranged with the clamping holes for positioning the inner core. The positioning component is separately provided with the tube body, and the positioning component is in contact with the tube surface inside the tube body. A first limiting structure and a second limiting structure are provided inside the tube body. The first limiting structure contacts the tail end surface of the positioning component, and the second limiting structure contacts the head end surface of the positioning component. The positioning component is fixed in the tube body by the first limiting structure and the second limiting structure. The positioning component is arranged inside the tube body, and the positioning component divides the cavity inside the tube body. The head end of the tube body is provided with at least one pressure reducing hole, which is connected to the internal space of the tube body. Correspondingly, the positioning component is provided with a pressure reducing channel that connects the tube spaces on both sides thereof.

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