Tissue expansion system for craniocerebral operation

Abstract

The utility model discloses a tissue expansion system for craniocerebral surgery, which relates to the technical field of medical instruments and comprises an outer tube, an inner tube, a clamping component and a fastening component, and the tail end of the inner tube extends out of the tail end of the outer tube; a clamping handle is arranged at the top end of the outer pipe, and a clamping hole is formed in the clamping handle; a bearing part is arranged in the inner pipe, and a first through hole is formed in the bearing part; the clamping assembly is arranged on the bearing part and comprises a pressing piece and a first elastic piece, a second through hole is formed in the pressing piece, and a first pressing part is arranged on the outer side of the pressing piece; the fastening assembly comprises a main body and a clamping piece, the main body is arranged above the clamping assembly, a third through hole is formed in the main body, and the clamping piece is clamped with the clamping hole; the first through holes and the second through holes are arranged in a staggered mode, and the first through holes and the third through holes coincide. According to the tissue expansion system, effective expansion of a soft tissue incision is achieved, an endoscope pipeline can freely stretch out and draw back in the inner pipe and can be rapidly clamped, damage to the soft tissue incision is smaller, and disassembly, assembly and cleaning are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a tissue expansion system used for cranial surgery. Background Art

[0002] When neurosurgeons perform craniotomy on patients with brain lesions, tumors, hemorrhages, etc., they often need to use an endoscope to penetrate the skull to accurately explore the pathology and confirm the surgical location, as the location of brain tumors, lesions or bleeding points, the patient's surgical position, and the size of the cerebral cortex incision vary from patient to patient. Currently, surgical incisions for cranial surgery are gradually moving towards minimally invasive surgery. However, because the surgical incision is too small, it will affect the intuitive and accurate observation of the location and shape of brain tumors, lesions or bleeding points. Therefore, the elasticity of soft tissue is utilized to first use an expansion device to appropriately expand the minimally invasive incision. Then, the endoscope is slowly inserted from the inside of the expansion device into the skull to explore the lesion site and perform minimally invasive surgery. During the entire process of inserting the expansion device into the minimally invasive incision, it is necessary to constantly observe the contact between the expansion device and the surrounding and internal tissues of the skull, so the assistance of an endoscope is also required at this time. Therefore, the expansion device must not only properly expand the minimally invasive incision, but also ensure that the endoscope can pass smoothly inside the expansion device without getting stuck. Furthermore, when the expansion device is inserted into the minimally invasive incision, it must ensure that the endoscope is firmly fixed inside the expansion device without shifting or sliding, so as to cope with unknown situations inside the brain and avoid damage to the brain and related tissues. This places high demands on the expansion device's structure. Summary of the Invention

[0003] To address the shortcomings of the above-mentioned existing technologies, the present invention provides a tissue expansion system for cranial surgery. This system is configured as an inner and outer cannula, with a specially structured clamping assembly within the inner cannula to clamp and release the endoscope. The provision of a fastening assembly also makes the entire tissue expansion system easier to disassemble, assemble, and clean. This is achieved through the following techniques.

[0004] The clamping assembly is configured to extend the opening of the clamping section and to extend the opening of the clamping section so that the clamping section can extend beyond the opening of the clamping section. The clamping assembly comprises a main body and a clamping member, the main body being configured to extend the opening of the clamping member and the main body being provided with a third through hole, the clamping member comprising a clamping portion, the clamping portion being engaged with the clamping hole. The clamping member is configured to extend the opening of the clamping section and the inner tube being connected to the clamping hole.

[0005] The assembly and use of the tissue expansion system provided by the present invention are as follows:

[0006] (1) Insert the inner tube into the outer tube and place it inside the outer tube so that the end of the inner tube extends out from the end of the outer tube.

[0007] (2) Place the pressing piece of the clamping assembly on the bearing portion of the inner tube, with the first pressing portion exposed from the top side of the inner tube to facilitate manual pressing; assemble the first elastic piece between the outer side of the pressing piece and the inner wall of the inner tube.

[0008] When the first pressing portion is pressed by hand, the pressing member can move back and forth in the horizontal direction and reset due to the elasticity of the first elastic member.

[0009] (3) Press the main part of the fastening assembly onto the pressing part of the clamping assembly, and insert the clamping part of the fastening assembly into the clamping hole of the clamping handle of the outer tube. In this way, the fastening assembly firmly fixes the outer tube, the inner tube, and the clamping assembly together, completing the assembly of the tissue expansion system.

[0010] After assembly, under the action of the first elastic member, the first through-hole on the inner tube's support portion and the second through-hole on the pressing member are vertically staggered, and the first through-hole and the third through-hole on the fastening assembly's main body are vertically aligned. In other words, the first and third through-holes are coaxial, but neither is coaxial with the second through-hole.

[0011] (4) Extending the endoscope tube downward into and through the third through hole. Since the first through hole and the third through hole are not coaxial with the second through hole, the endoscope tube is blocked by the pressing member and cannot be extended into and through the second through hole.

[0012] At this time, the surgeon presses the first pressing part with his hand to move the pressing member, and finally makes the first through hole, the second through hole and the third through hole coaxial; by keeping the pressing member in this state by hand, the endoscope tube is able to extend into and pass through the second through hole, and finally pass through the first through hole, and extend out from the outlet at the end of the inner tube; at this time, the first elastic member is in an elastic deformation state.

[0013] When the lens of the endoscope just extends out from the outlet at the end of the inner tube, the operator's hand releases the first pressing part, and the pressing part begins to reset due to the elastic force of the first elastic part. However, due to the obstruction of the endoscope tube, it is impossible to reset to the original position, and under the elastic force of the first elastic part, the outer side of the endoscope tube is firmly clamped by the inner walls of the first through hole, the second through hole and the third through hole; thereby fixing the lens of the endoscope at a preset position.

[0014] (5) When the soft tissue incision on the patient's head needs to be expanded, the assembled tissue expansion system is slowly inserted into the soft tissue incision. Under the slow expansion of the inner tube and the outer tube, the soft tissue incision is slowly stretched open until the end of the outer tube is completely inserted into the soft tissue incision.

[0015] While the tissue expansion system is slowly inserted into the soft tissue incision, the endoscope lens constantly observes and monitors the situation inside the brain, and determines the insertion depth of the outer and inner tubes through the images of the brain inside transmitted by the lens.

[0016] (6) After the expansion of the soft tissue incision is completed, if it is necessary to continue exploring inside the brain, the first pressing part can be pressed again by hand to continue to draw the endoscope tube into the brain.

[0017] When performing surgery, the first pressing portion can be pressed to release the endoscope channel, and then the endoscope channel can be pulled out to perform surgery with other surgical tools.

[0018] However, the outlet port at the end of the inner tube is generally small, making surgery inconvenient. To expand the space for surgical instruments, the clamping portion and the clamping hole are loosened, and the inner tube, pressing assembly, endoscope, and fastening assembly are all removed. The endoscope is then inserted into the interior of the outer tube and extended through the outlet port at the end of the outer tube to perform the surgery. After the surgery is completed, the outer tube and endoscope can be slowly withdrawn. Of course, if necessary, the endoscope can be removed and replaced with other tools and equipment that can be inserted through the end of the outer tube into the brain for surgical operation.

[0019] It should be noted that the connection / splicing and other forms mentioned in the claims and description of the utility model can generally be combined together by using a slightly interference fit structure, and after the combination, the two components can be separated by applying a slight external force, which can ensure that the assembly is firm and the disassembly is convenient.

[0020] It should be noted that the outer and inner tubes are thin and polished to a smooth finish, so they won't damage the soft tissue incision on the patient's head. They don't need to fit tightly together, and the inner tube can be easily pulled out of the outer tube.

[0021] It should be noted that the end of the inner tube and the end of the outer tube are connected by a smooth surface, that is, the relative depth of the inner tube inserted into the outer tube is fixed, and there will be no situation where the inner tube continues to slide downward inside the outer tube. To achieve this purpose, the outer tube and the inner tube can be set to a specific shape to limit the position. Optionally, in order to facilitate the sleeve installation and fixed position, the inner cavity of the outer tube and the inner tube can be set to a form that is slightly thicker at the top than the end. The slightly inclined inner wall of the outer tube can play a certain role in limiting the inserted inner tube, so that the inner tube is inserted into the predetermined position.

[0022] The inner tube and fixed tube of the soft tissue expander do not need to fit tightly together, nor do the gland and the top of the inner tube. Of course, these components can also be tightly fitted using interference fits or other methods. The clips and holes are used to secure the gland. Once secured, the entire soft tissue expander is more secure.

[0023] It should be noted that the clamping portion and the clamping hole are preferably configured to facilitate connection and disconnection, which facilitates subsequent surgical procedures. The function of the clamping portion is to mate with the clamping handle on the outer tube, and the two can also be easily disconnected. Therefore, there are various structural forms for the clamping portion and the clamping hole. The most common one is a structure in which the clamping portion is slightly inserted into the clamping hole, so that the clamping portion can be removed with only a slight force when disconnected.

[0024] As a preferred structure of the clamping member, in order to make the clamping portion more firmly engaged in the clamping hole, the clamping member also includes a base, a second pressing portion, and a second elastic member. The second pressing portion is connected to the clamping portion, and the second elastic member is located between the base and the second pressing portion. The clamping portion is clamped to the clamping hole. After the clamping portion extends into the clamping hole, the second elastic member can control the clamping portion to reset and firmly engage. Pressing the second pressing portion to disengage the clamping portion from the clamping hole can detach the clamping portion from the clamping hole.

[0025] More preferably, based on the above preferred structure, a stop plate is provided in the middle of the base, and two of the clamping portion, the second pressing portion, and the second elastic member are provided and symmetrically arranged relative to the stop plate. The clamping portion and the clamping hole can be released by pressing the two second pressing portions in opposite directions with the thumb and index finger.

[0026] Preferably, the inner wall of the second through hole is provided with an auxiliary clamping member. The auxiliary clamping member serves to increase the friction between the endoscope tube and the inner wall of the second through hole, thereby achieving a better clamping effect. Therefore, the auxiliary clamping member can be made of any material that can increase friction, such as rubber.

[0027] Preferably, in order to facilitate the disassembly and assembly of the entire tissue expansion system and to facilitate the cleaning of the inner tube after the operation, the inner tube includes an upper inner tube and a lower inner tube spliced together.

[0028] It should be noted that the bearing portion can be located in either the upper inner tube or the lower inner tube. When located in the lower inner tube, the bearing portion is preferably located at the top of the lower inner tube to facilitate placement of the clamping assembly. When located in the upper inner tube, the bearing portion can be located anywhere.

[0029] More preferably, in order to make the lower inner tube and the upper inner tube be spliced more firmly, the lower inner tube and the upper inner tube are spliced through a step.

[0030] Further preferably, in order to prevent the lower inner tube and the upper inner tube from rotating relative to each other in the circumferential direction, a protrusion or a groove is provided at the top end of the lower inner tube, and a groove or a protrusion is provided at the bottom end of the upper inner tube. The shapes of the groove and the protrusion match to limit the circumferential rotation.

[0031] Preferably, the end surface of the distal end of the outer tube is an inclined surface, so as to increase the area and space for surgical operation after the inner tube is removed, thereby making the instrument more convenient to operate.

[0032] Preferably, in order to make the insertion process of the ends of the outer tube and the inner tube smoother and reduce damage to surrounding soft tissues, the tube wall of the end of the outer tube is an inclined surface toward the axis.

[0033] Preferably, the top end of the hole wall of the second through hole is an inclined surface. Such a design can more conveniently guide the endoscope tube to be quickly inserted into the second through hole without squeezing the first pressing portion.

[0034] It's important to note that elevated intracranial pressure (ICP) is typically caused by liquid cerebrospinal fluid (CSF) or blood clots inside the patient's head. Once the tissue expansion system is inserted into the patient's head, if the patient experiences elevated ICP, CSF and other fluids can naturally flow through the system's various internal gaps and channels (e.g., between the outer and inner tubes, and between the fixed and central tubes) toward the top of the device, alleviating the patient's elevated ICP. Therefore, in principle, this device does not require any dedicated vents or pressure relief channels.

[0035] However, in order to achieve a better exhaust and pressure relief effect, preferably, a first exhaust hole is provided at the bottom end of the inner tube, a second exhaust hole is provided on the bearing portion, and a third exhaust hole is provided on the main body. The first exhaust hole, the second exhaust hole, the third exhaust hole, and other gap channels inside the inner tube constitute an intracranial pressure relief channel. Therefore, if there is excessive intracranial pressure, cerebrospinal fluid and other fluids can overflow along the intracranial pressure relief channel, reducing the increase in intracranial pressure caused by the soft tissue expansion device extending into the head, and quickly alleviating the patient's excessive intracranial pressure.

[0036] Preferably, in order to more accurately ensure the depth position of the inner tube inserted into the outer tube, a limiting boss is provided on the upper portion of the inner tube, and the limiting boss abuts against the top end of the outer tube.

[0037] Preferably, a placement groove is provided on a side surface of the pressing member, and the first elastic member is arranged in the placement groove.

[0038] Preferably, the first elastic member and the first pressing portion are arranged on the same side or opposite to each other.

[0039] Preferably, the snap-on handle is provided with an anti-slip structure.

[0040] Preferably, the outer side of the tube wall of the outer tube is provided with a scale in the vertical direction for judging the depth of the outer tube inserted into the soft tissue incision of the patient's head.

[0041] Preferably, a limit groove / limiting member is provided at the top end of the inner tube, and a limit member / limiting groove is provided at the bottom end of the main body, wherein the limit groove and limit member match each other. The limit groove and limit member also serve to assemble the inner tube and the fastening assembly together and prevent the inner tube from rotating in the circumferential direction.

[0042] Optionally, the inner tube and the outer tube are made of transparent material, which facilitates observation of the internal conditions of the inner tube and the outer tube.

[0043] Optionally, the function and purpose of the first elastic member and the second elastic member is to move and reset the first pressing portion and the second pressing portion. Therefore, any structure that can meet the above functions, such as a spring or a spring, falls within the scope of the first elastic member and the second elastic member of the present invention.

[0044] It should be noted that the tissue expansion system provided by the present invention can be either cleanable and reusable or disposable. For reuse, the components can be disassembled, cleaned, and reassembled. For safety and contamination prevention purposes, when the system is intended for single-use, glue can be applied to the joints between the inner tube and the clamping assembly, as well as the joints between the clamping assembly and the fastening assembly, during initial assembly. Once assembled, the inner tube and clamping assembly, and the clamping assembly and fastening assembly, cannot be disassembled.

[0045] For the inner tube formed by splicing a lower inner tube and an upper inner tube, glue can also be applied to the joint portion of the lower inner tube and the upper inner tube for splicing.

[0046] When a limiting groove is provided at the top end of the inner tube and a limiting piece is provided at the bottom end of the main body of the fastening assembly, glue can also be applied to the contact portion between the limiting groove and the limiting piece to splice the inner tube and the fastening assembly together.

[0047] Compared with the existing technology, the benefits of the present invention are: the tissue expansion system for cranial surgery provided by the present invention is aimed at minimally invasive soft tissue incisions. By setting up an outer tube, inner tube, clamping assembly and fastening assembly with a special structure, it not only achieves effective expansion of the soft tissue incision, but also enables the endoscope tube to move freely and retractably in the inner tube and be quickly clamped, which can more accurately control the movement of the endoscope in the skull; it causes less damage to the patient's head incision; the entire tissue expansion system is very convenient to disassemble and clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the internal structure of the first tissue expansion system provided by the present invention;

[0049] Figure 2 for Figure 1 Schematic diagram of the internal structure of the tissue expansion system after the endoscope is inserted;

[0050] Figure 3 A right-side internal structural diagram of a first preferred structure of the clamping portion;

[0051] Figure 4 A schematic diagram of the internal structure of a second preferred structure of the clamping portion;

[0052] Figure 5 Schematic diagram of the preferred structure of the clamping assembly;

[0053] Figure 6 A schematic diagram of the partial structure of a first preferred structure of the inner tube;

[0054] Figure 7 Schematic diagram of the three-dimensional structure of the second preferred structure of the inner tube;

[0055] Figure 8 Schematic diagram of the preferred structure of the outer tube;

[0056] Figure 9 Schematic diagram of the third preferred structure of the inner tube;

[0057] Figure 10 This is a schematic diagram of the local structure of the tissue expansion system;

[0058] Figure 11 A schematic three-dimensional diagram of a preferred structure of a pressing member;

[0059] Figure 12 Schematic diagram of the preferred structure of the pressing member and the first elastic member;

[0060] Figure 13 It is a schematic diagram of the three-dimensional structure of the main body of the inner tube, the clamping assembly and the fastening assembly;

[0061] Figure 14 A schematic diagram of the internal structure of the optimal structure of the tissue expansion system provided by the present invention;

[0062] In the figure: 1. outer tube; 2. inner tube; 3. snap-fit handle; 4. snap-fit hole; 5. bearing part; 6. first through hole; 7. pressing member; 8. first elastic member; 9. second through hole; 10. first pressing part; 11. main body; 12. third through hole; 13. snap-fit part; 14. base; 15. second pressing part; 16. second elastic member; 17. abutment plate; 18. auxiliary clamping member; 19. lower inner tube; 20. upper inner tube; 21. step; 22. groove; 23. protrusion; 24. first exhaust hole; 25. second exhaust hole; 26. third exhaust hole; 27. limiting boss; 28. placement groove; 29. scale; 30. limiting groove; 31. limiting member; 32. anti-slip structure. DETAILED DESCRIPTION

[0063] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0064] like Figure 1 、 2As shown, a tissue expansion system for cranial surgery provided in a specific embodiment of the present invention includes an outer tube 1, an inner tube 2, a clamping assembly and a fastening assembly. The inner tube 2 is sleeved inside the outer tube 1, and the end of the inner tube 2 extends from the end of the outer tube 1. The end of the inner tube 2 and the end of the outer tube 1 are connected through a smooth surface; the top of the outer tube 1 is provided with a clamping handle 3, and the clamping handle 3 is provided with a clamping hole 4; the interior of the inner tube 2 is provided with a bearing portion 5, and the bearing portion 5 is provided with a first through hole 6; the clamping assembly is arranged on the bearing portion 5, and the clamping assembly includes a pressing member 7 and a first elastic member 8 (spring), a second through hole 9 is provided on the pressing member 7, a first pressing portion 10 is provided on the outer side of the pressing member 7, two ends of the first elastic member 8 are respectively in contact with the pressing member 7 and the inner tube 2, and the first elastic member 8 is arranged opposite to the first pressing portion 10; the fastening assembly includes a main body 11 and a clamping member, the main body 11 is arranged above the clamping assembly, a third through hole 12 is provided on the main body 11, the clamping member includes a clamping portion 13, and the clamping portion 13 is clamped with the clamping hole 4; the first through hole 6 and the second through hole 9 are staggered up and down, and the first through hole 6 and the third through hole 12 are arranged to overlap up and down.

[0065] The above tissue expansion system is assembled as follows:

[0066] (1) Insert the inner tube into the outer tube and place it inside the outer tube so that the end of the inner tube extends out from the end of the outer tube.

[0067] (2) Place the pressing piece of the clamping assembly on the bearing portion of the inner tube, with the first pressing portion exposed from the top side of the inner tube, and assemble the first elastic piece (spring) between the outer side of the pressing piece and the inner wall of the inner tube.

[0068] (3) Press the main part of the fastening assembly onto the pressing piece, and insert the clamping part of the clamping piece into the clamping hole. In this way, the fastening assembly firmly fixes the outer tube, the inner tube, and the clamping assembly together. The structure of the finally assembled tissue expansion system is as follows: Figure 1 shown.

[0069] When using the tissue expansion system, the endoscope tube is first inserted downward into the third through hole. In the initial state, since the second through hole is not coaxial with the first through hole and the third through hole, the endoscope tube cannot be smoothly extended into and passed through the second through hole. Subsequently, the operator presses the first pressing part to move the pressing member, and the first elastic member is compressed, so that the second through hole is eventually gradually coaxial with the first through hole and the third through hole. The pressing member is kept in this state, while the endoscope tube is extended into and passed through the second through hole, and finally passes through the first through hole below. The final state is as follows. Figure 2 shown.

[0070] When the endoscope lens just extends out from the outlet at the end of the inner tube, the first pressing part is released, and the pressing member is reset by the rebound force of the first elastic member. However, it cannot be reset to its original position due to the obstruction of the endoscope tube, thereby clamping the endoscope tube and fixing the endoscope lens at a preset position.

[0071] When the soft tissue incision needs to be expanded, the tissue expansion system and endoscope, assembled as described above, are slowly inserted into the soft tissue incision. Under the slow guidance and expansion of the inner and outer tubes, the soft tissue incision is slowly stretched open until the end of the outer tube is completely inserted into the soft tissue incision. During this process, the endoscope constantly observes the internal conditions of the brain so that the depth of insertion of the outer and inner tubes can be adjusted at any time.

[0072] After adjusting the insertion depth of the outer and inner tubes, the first pressing portion can be pressed to advance the endoscope further into the brain until the lesion is observed. If surgery is required, in addition to operating directly through the outlet of the inner tube, the clamping portion can be loosened, and the inner tube, pressing component, endoscope, and fastening component can be completely removed, leaving only the outer tube. The endoscope or other surgical instruments can then be reinserted into the outer tube, and the surgery can be performed through the outlet at the end of the outer tube. After the surgery is completed, the outer tube and endoscope can be slowly withdrawn.

[0073] Alternatively, the outer tube and the inner tube can be made of plastic, with thin walls and polished to be smooth, so as not to damage the soft tissue incision on the patient's head. The outer tube and the inner tube do not need to be tightly fitted together, and the inner tube can be easily withdrawn from the outer tube.

[0074] Optionally, the clamping portion and the clamping hole are preferably configured to be easily connected and disconnected, which is more convenient for subsequent surgical operations. The function of the clamping portion is to be assembled with the clamping handle on the outer tube, and the two can be easily disconnected again. Therefore, there are various structural forms of the clamping portion and the clamping hole. Figure 1 As shown, the most commonly used structure is that the clamping part is clamped into the clamping hole in a slightly interference fit structure, and the clamping part can be removed with only a slight force when disassembling.

[0075] like Figure 1 、 2 As shown, in order to facilitate installation and fixed position, the inner cavities of the outer tube and the inner tube can be set to be slightly thicker at the top than at the end. The slightly inclined inner wall of the outer tube can play a certain limiting role on the inserted inner tube, so that the inner tube can be inserted into the predetermined position.

[0076] Optionally, the inner tube and the outer tube may be made of transparent material to facilitate observation of the internal conditions.

[0077] Optionally, the first and second elastic members respectively facilitate the movement and reset of the first and second pressing portions. Therefore, any structure that can fulfill the aforementioned functions falls within the scope of the first and second elastic members of the present invention, such as a spring or a spring. For ease of illustration, the drawings of the embodiments of the present invention uniformly depict the first and second elastic members as spring structures.

[0078] like Figure 3 As shown in the right view of the internal structure diagram, in order to make the clamping part more firmly clamped in the clamping hole and to make it easier to detach the clamping part from the clamping hole, as one of the structures of the clamping part, the clamping part also includes a base 14, a second pressing part 15 and a second elastic part 16 (spring), the second pressing part 15 is connected to the clamping part 13, the second elastic part 16 is located between the base 14 and the second pressing part 15, and the clamping part 13 is clamped to the clamping hole 4.

[0079] like Figure 4 As shown, in Figure 3 On the basis of the clamping member structure, in order to facilitate the surgeon's hand force and single-handed operation, a stop plate 17 is provided in the middle of the base 14. The clamping portion 13, the second pressing portion 15, and the second elastic member 16 are each provided with two and symmetrically arranged relative to the stop plate 17. The clamping portion and the clamping hole can be released by pressing the two second pressing portions in opposite directions with the thumb and index finger.

[0080] like Figure 5 As shown, since the clamping of the endoscope channel is achieved by the friction of the inner wall of the second through hole, in order to increase this friction, the inner wall of the second through hole 9 is provided with an auxiliary clamping member 18. The auxiliary clamping member can be made of any material that can increase friction, such as rubber.

[0081] like Figure 6 As shown, the inner tube 2 includes a lower inner tube 19 and an upper inner tube 20 spliced from bottom to top. The inner tube is arranged into an upper inner tube and a lower inner tube, and it is also convenient to disassemble and assemble the inner tube after surgery and to perform effective cleaning.

[0082] Alternatively, as Figure 6 As shown, the lower inner tube 19 and the upper inner tube 20 are spliced together via a step 21 .

[0083] like Figure 7 As shown, to prevent the lower inner tube and the upper inner tube from rotating relative to each other in the circumferential direction, a groove 22 is provided at the top end of the lower inner tube 19, and a protrusion 23 is provided at the bottom end of the upper inner tube 20. The shapes of the groove 22 and the protrusion 23 match. To more accurately ensure the depth of the inner tube inserted into the outer tube, a limiting boss 27 is provided on the upper portion of the inner tube 2, which abuts against the top end of the outer tube 1.

[0084] like Figure 8 As shown, the end face of the distal end of the outer tube 1 is an inclined surface, so that after the inner tube is removed, the area and space for surgical operation can be increased, making the instrument more convenient to operate.

[0085] like Figure 8 As shown, the outer side of the tube wall of the outer tube 1 is provided with a scale 29 in the vertical direction to help the surgeon confirm the depth of the outer tube inserted into the soft tissue incision.

[0086] It's important to note that elevated intracranial pressure (ICP) is typically caused by liquid cerebrospinal fluid (CSF) or blood clots inside the patient's head. Once the tissue expansion system is inserted into the patient's head, if the patient experiences elevated ICP, CSF and other fluids can naturally flow through the system's various internal gaps and channels (e.g., between the outer and inner tubes, and between the fixed and central tubes) toward the top of the device, alleviating the patient's elevated ICP. Therefore, in principle, this device does not require any dedicated vents or pressure relief channels.

[0087] However, in order to make the exhaust pressure relief effect better, such as Figure 7 、 9 As shown, the bottom end of the inner tube 2 is provided with a first exhaust hole 24. Figure 10 、 13 As shown, the supporting portion 5 is provided with a second exhaust hole 25, as shown in FIG. Figure 10 、 13 As shown, the main body 11 is provided with a third exhaust hole 26. These first exhaust hole, second exhaust hole, third exhaust hole and other gap channels inside the inner tube constitute an intracranial pressure relief channel, and the pressure relief effect is relatively better.

[0088] like Figure 11 As shown, in order to make the installation of the pressing member more stable, a placement groove 28 is provided on the side of the pressing member 7, and the first elastic member 8 is arranged in the placement groove 28.

[0089] like Figure 12 As shown, the first elastic member 8 is arranged on the same side as the first pressing portion 10, and can also realize the basic function of the first pressing portion; at this time, when the second through hole is coaxial with the first through hole and the second through hole, the first elastic member (spring) is also in a compressed state.

[0090] like Figure 13 As shown, a limiting groove 30 is provided at the top end of the inner tube 2, and a limiting member 31 matching the limiting groove 30 is provided at the bottom end of the main body 11 to prevent the inner tube from rotating circumferentially relative to the fastening assembly.

[0091] Alternatively, as Figure 1 As shown, the clamping handle 3 is provided with an anti-slip structure 32 .

[0092] Optionally, the top of the hole wall of the second through hole 9 is an inclined surface, which can facilitate the rapid insertion of the endoscope tube into the second through hole.

[0093] Optionally, the tube wall at the end of the outer tube 1 is an inclined surface toward the axis, which can reduce damage to the surrounding soft tissue during the process of the outer tube and the inner tube extending into the soft tissue incision.

[0094] It should be noted that the tissue expansion system provided by the present invention can be either cleanable and reusable or disposable. For reuse, the components can be disassembled, cleaned, and reassembled. For safety and contamination prevention purposes, when the system is intended for single-use, glue can be applied to the joints between the inner tube and the clamping assembly, as well as the joints between the clamping assembly and the fastening assembly, during initial assembly. Once assembled, the inner tube and clamping assembly, and the clamping assembly and fastening assembly, cannot be disassembled.

[0095] like Figure 14 As shown, the preferred structures of all the above embodiments are combined to obtain the optimal structure of the tissue expansion system of the present invention. This structure is easy to assemble and disassemble, and is more convenient and stable for clamping the endoscope.

[0096] It should be added that, in the above specific embodiment, for the inner tube formed by splicing the lower inner tube and the upper inner tube, in order to make the splicing tighter, glue can be applied to the joint of the lower inner tube and the upper inner tube for splicing.

[0097] It should also be added that in the above specific embodiment, when a limiting groove is provided at the top end of the inner tube and a limiting piece is provided at the bottom end of the main body of the fastening assembly, glue can also be applied to the contact part between the limiting groove and the limiting piece to splice the inner tube and the fastening assembly together.

[0098] The above specific embodiments describe the implementation of the present invention in detail, but the present invention is not limited to the specific details of the above embodiments. Within the scope of the claims and technical concept of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications are all within the scope of protection of the present invention.

Claims

1. A tissue expansion system for cranial surgery, characterized in that: The clamping assembly comprises an outer tube, an inner tube, a clamping assembly and a fastening assembly, wherein the inner tube is sleeved inside the outer tube, the end of the inner tube extends from the end of the outer tube, and the end of the inner tube and the end of the outer tube are connected by a smooth surface; the top of the outer tube is provided with a clamping handle, and the clamping handle is provided with a clamping hole; a bearing portion is provided inside the inner tube, and the bearing portion is provided with a first through hole; the clamping assembly is arranged on the bearing portion, and the clamping assembly comprises a pressing member and a first elastic member, and the pressing member is provided with a second through hole on the outer side of the pressing member, and the two ends of the first elastic member abut against the pressing member and the inner tube respectively; the fastening assembly comprises a main body and a clamping member, the main body is arranged above the clamping assembly, and the main body is provided with a third through hole, and the clamping member includes a clamping portion, and the clamping portion is clamped with the clamping hole; the first through hole and the second through hole are staggered up and down, and the first through hole and the third through hole are overlapped up and down.

2. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The clamping member further includes a base, a second pressing portion and a second elastic member, the second pressing portion is connected to the clamping portion, and the second elastic member is located between the base and the second pressing portion.

3. The tissue expansion system for cranial surgery according to claim 2, characterized in that: A butt plate is provided in the middle of the base, and two of the clamping portion, the second pressing portion and the second elastic member are provided and are symmetrically arranged relative to the butt plate.

4. The tissue expansion system for cranial surgery according to claim 1, characterized in that: An auxiliary clamping piece is provided on the inner wall of the second through hole.

5. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The inner tube comprises an upper inner tube and a lower inner tube which are spliced together.

6. The tissue expansion system for cranial surgery according to claim 5, characterized in that: The lower inner tube and the upper inner tube are spliced via steps.

7. The tissue expansion system for cranial surgery according to claim 5 or 6, characterized in that: The top end of the lower inner tube is provided with a protrusion or a groove, and the bottom end of the upper inner tube is provided with a groove or a protrusion, and the shapes of the groove and the protrusion match.

8. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The end surface of the distal end of the outer tube is an inclined surface.

9. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The tube wall at the end of the outer tube is an inclined surface facing the axis.

10. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The top end of the hole wall of the second through hole is an inclined surface.

11. The tissue expansion system for cranial surgery according to claim 1, characterized in that: A first exhaust hole is provided at the bottom end of the inner tube, a second exhaust hole is provided on the bearing portion, and a third exhaust hole is provided on the main body.

12. The tissue expansion system for cranial surgery according to claim 1, characterized in that: A limiting boss is provided on the upper portion of the inner tube, and the limiting boss abuts against the top end of the outer tube.

13. The tissue expansion system for cranial surgery according to claim 1, characterized in that: A placement groove is provided on the side surface of the pressing member, and the first elastic member is arranged in the placement groove.

14. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The first elastic member and the first pressing portion are arranged on the same side or opposite to each other.

15. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The clamping handle is provided with an anti-slip structure.

16. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The outer side of the tube wall of the outer tube is provided with scales along the vertical direction.

17. The tissue expansion system for cranial surgery according to claim 1, characterized in that: The top end of the inner tube is provided with a limiting groove / limiting member, and the bottom end of the main body is provided with a limiting member / limiting groove, and the limiting groove and the limiting member match each other.

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