Tissue spreading device

Abstract

This invention provides a tissue-expanding device, comprising an annular frame and a control assembly. The annular frame includes a first portion and a second portion hinged together. The annular frame can expand and contract by driving either the first or second portion, and expands tissue during expansion. The control assembly controls the movement of the annular frame and includes a drive shaft, a base, a locking threaded component, and an abutment. The base is hollow and has external threads. The drive shaft passes through the base. The first portion is connected to the base, and the second portion is connected to the drive shaft. The locking threaded component is threadedly connected to the base. The abutment is disposed between the locking threaded component and the drive shaft, and abuts or separates from the drive shaft as the locking threaded component rotates, thereby locking or allowing relative movement between the drive shaft and the base.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and in particular relates to a tissue spreading device. Background Technology

[0002] Tissue surgery, to minimize trauma to the patient, is typically performed in confined surgical spaces. For example, a type of cardiac tissue surgery repairing structural diseases of the mitral or tricuspid valves involves surgically opening the atrium. After the surgeon makes an incision in the atrium, a specialist needs to use assistive instruments to open the atrial tissue to expose the mitral or tricuspid valve between the atrium and ventricle. Alternatively, the atrial tissue may be sutured at one end, with the other end either attached to a support or held firmly by hand. Because this type of surgery inherently involves limited operating space and is technically challenging, requiring a large number of medical personnel for assistance further complicates the procedure. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a tissue spreading device, comprising:

[0004] An annular frame, comprising a first portion and a second portion hinged together, wherein the annular frame can be expanded and contracted by driving the first portion or the second portion, the annular frame being used to stretch tissue when expanded; and

[0005] A control component for controlling the movement of the annular frame includes a drive shaft, a base, a locking threaded component, and an abutment. The base is hollow and has external threads. The drive shaft passes through the base. A first portion is connected to the base, and a second portion is connected to the drive shaft. The locking threaded component is threadedly connected to the base. The abutment is disposed between the locking threaded component and the drive shaft and abuts or separates from the drive shaft as the locking threaded component rotates, thereby locking or allowing the drive shaft to move relative to the base.

[0006] In a preferred embodiment, the first part and the second part are each a ring structure, the ring structure including a plurality of hinged support rods, and each of the support rods of the second part is hinged to one of the support rods of the first part.

[0007] In a preferred embodiment, the base includes a connecting seat and a tubular component connected to the connecting seat, the connecting seat being located at a proximal end and the tubular component at a distal end, the drive shaft passing through the connecting seat and the tubular component, the connecting seat being provided with the external thread, at least a portion of the first part being fixed to the tubular component, the second part being connected to the distal end of the drive shaft, the second part causing the first part to expand or contract radially in conjunction with the axial movement of the drive shaft.

[0008] In a preferred embodiment, when the axial distance between the distal end of the drive shaft and the fixed position of the first part increases, the second part causes the first part to contract; when the axial distance between the distal end of the drive shaft and the fixed position of the first part decreases, the second part causes the first part to expand.

[0009] In a preferred embodiment, the first part and the second part further include a plurality of hinge members, wherein the middle portion of each of the support rods in the first part is hinged to the middle portion of one of the support rods in the second part, each pair of adjacent support rods in the first part is hinged to a different hinge point of a hinge member, and each pair of adjacent support rods in the second part is hinged to a different hinge point of a hinge member.

[0010] In a preferred embodiment, the tube body is provided with a limiting structure to limit the distance the locking threaded part moves relative to the connecting seat.

[0011] In a preferred embodiment, the locking threaded component includes an internal thread and a pressing bevel, the abutment is a spherical body, the base includes an external thread and a channel penetrating the base, the spherical body is accommodated in the channel, and clamps the drive shaft when pressed by the pressing bevel as the locking threaded component moves.

[0012] In a preferred embodiment, the locking threaded component includes an internal thread and a stepped surface, the abutment is a clamping sleeve, the drive shaft passes through the abutment, the abutment has a pressing slope, and when the pressing slope is pressed by the stepped surface as the locking threaded component moves, the abutment abuts against the drive shaft.

[0013] In a preferred embodiment, the device further includes a grip handle that includes an operating lever that extends into the connector and is detachably connected to the drive shaft.

[0014] In a preferred embodiment, the first part and the second part are respectively formed by four of the support rods hinged together by the hinge member to form a quadrilateral structure, or by eight of the support rods hinged together by the hinge member to form an octagonal structure.

[0015] In a preferred embodiment, the height of the annular frame when expanded is between 15mm and 25mm, and the maximum width of the annular frame on a plane after being expanded to its maximum extent does not exceed 80mm.

[0016] The tissue spreading device provided by this invention can be applied in surgical procedures with limited operating space to help spread tissue, ensuring that the tissue does not interfere with the surgical position, while providing the surgeon with a suitable operating space. The annular frame comprises a first part and a second part that are hinged together. The first part is connected to the base, and the second part is connected to the drive shaft. The base and the drive shaft can be locked or moved relative to each other by locking threads and abutment members. When they can move relative to each other, driving the first or second part can expand and contract the entire annular frame. When expanding, the annular frame can be used to spread tissue. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some implementation methods provided by the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the contracted state of the tissue spreading device provided in the first embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A schematic diagram of an expanded state of the tissue-spreading device.

[0020] Figure 3 yes Figure 1 A schematic diagram of another expanded state of the tissue-spreading device.

[0021] Figure 4 yes Figure 3 A schematic diagram of the structure of the first hinged member of the tissue spreading device.

[0022] Figure 5 yes Figure 3 A schematic diagram of the structure of the second hinge member of the organization spreading device.

[0023] Figure 6 yes Figure 1 A three-dimensional schematic diagram of the control components of the tissue expansion device.

[0024] Figure 7 yes Figure 6 A partial cross-sectional view of the control components along the DD line.

[0025] Figure 8 yes Figure 7 An enlarged schematic diagram of part E of the control component, with 8A in the unlocked state and 8B in the locked state.

[0026] Figure 9This is a three-dimensional exploded view of the control component of the tissue spreading device provided in the second embodiment of the present invention.

[0027] Figure 10 yes Figure 9 A cross-sectional view of the assembly of the control components of the tissue expansion device.

[0028] Figure 11 This is a schematic diagram of an expanded state of the tissue spreading device provided in the third embodiment of the present invention.

[0029] Figure 12 This is a schematic diagram of a tissue spreading device provided in an embodiment of the present invention being inserted into an atrial surgical incision in a contracted state.

[0030] Figure 13 for Figure 12 A schematic diagram of the tissue opening device that expands the annular frame of the tissue opening device to open the tissue of the atrium surgical incision. Detailed Implementation

[0031] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] The following descriptions of the embodiments are made with reference to the accompanying illustrations, illustrating specific embodiments in which the invention can be implemented. Directional terms used in the description of the invention, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and "sidewall," are merely for the purpose of better and clearer explanation and understanding of the invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0033] In the description of this invention, terms such as "first," "second," "third," and "fourth" are used only to distinguish the objects being described and do not have any sequential or technical meaning.

[0034] In the description of this invention, the terms "connection" and "linkage" as used herein, unless otherwise specified, include both direct connection (linkage) and indirect connection (linkage).

[0035] In the field of interventional medical devices, the proximal end refers to the end closer to the operator, while the distal end refers to the end farther from the operator. The direction of the rotational axis of an object such as a cylinder or tube is defined as the axial direction; the circumferential direction is the direction around the axis of the object (perpendicular to the axis and also perpendicular to the cross-sectional radius); the radial direction refers to the direction along the diameter or radius. It is important to note that the term "end" appearing in terms such as "proximal end," "distal end," "one end," "the other end," "first end," "second end," "initial end," "end point," "both ends," "free end," "upper end," and "lower end" is not limited to the tip, endpoint, or end face, but also includes a portion extending axially and / or radially from the tip, endpoint, or end face on the element to which it belongs. The above definitions are for convenience only and should not be construed as limiting the invention.

[0036] Please see Figures 1 to 3 This invention provides a tissue retraction device 100, which can be widely used to retract tissue during surgery, especially suitable for use in surgical procedures to facilitate related surgeries at target surgical sites. The tissue retraction device 100 includes an annular frame 20 for retracting tissue and a control component 30. The annular frame 20 includes a first portion 22 and a second portion 24 that are hinged together. The first portion 22 and the second portion 24 are connected to different components of the control component 30. These different components of the control component 30 can be locked relative to each other or can move relative to each other. When they can move relative to each other, either the first portion 22 or the second portion 24 can be driven. Because the first portion 22 and the second portion 24 are hinged together, driving either the first portion 22 or the second portion 24 can cause the entire annular frame 20 to expand and contract.

[0037] Specifically, please refer to the following: Figure 6-8 The control component 30 includes a drive shaft 32, a base 34, a locking threaded part 36, and an abutment part 38. The base 34 is hollow and has an external thread 340. The drive shaft 32 passes through the base 34. A first part 22 is connected to the base 34, and a second part 24 is connected to the drive shaft 32. The locking threaded part 36 is threadedly connected to the base 34. The abutment part 38 is disposed between the locking threaded part 36, the base 34, and the drive shaft 32, and abuts or separates from the drive shaft 32 as the locking threaded part 36 rotates, thereby locking or allowing the drive shaft 32 to move relative to the base 34.

[0038] In this embodiment, the drive shaft 32 has an axial direction, passing through and extending out of the base 34, thus the extension direction of the drive shaft 32 is the axial direction. At least a portion of the first part 22 is connected to the base 34, and at least a portion of the second part 24 is connected to the drive shaft 32. When one of the drive shaft 32 and the base 34 moves axially relative to the other, at least a portion of the corresponding first part 22 or second part 24 is driven to move axially. Since the first part 22 and the second part 24 are hinged to each other, the other portions of the first part 22 and the second part 24 are pulled to expand and contract in a radial plane perpendicular to the aforementioned axial direction.

[0039] Specifically, the first part 22 and the second part 24 of the annular frame 20 are polygonal annular structures, and each annular structure includes multiple support rods 202 and multiple hinge members 204. Two adjacent support rods 202 are hinged to each other through a hinge member 204, and each support rod 202 of the second part 24 is hinged to one support rod 202 of the first part 22.

[0040] In this embodiment, the first part 22 has four support rods 202 and the second part 24 has four support rods 202. The ends of two adjacent support rods 202 are respectively hinged to different positions of the same hinge member 204 by pins 206 to form a quadrilateral structure. The middle part of each support rod 202 of the second part 24 is hinged to the middle part of one support rod 202 of the first part 22 by pins 206.

[0041] Specifically, please refer to the following: Figure 4 and Figure 5 The hinge component 204 includes a first hinge component 204a and a second hinge component 204b. Each of the first hinge component 204a and the second hinge component 204b has two hinge points 205a and 205b, each with a pin. These pins allow each support rod 202 to rotate around its respective hinge component 204. The two hinge points 205a and 205b of each of the first hinge component 204a and the second hinge component 204b allow the two support rods 202 to rotate independently on the hinge component 204 without interfering with each other. The two support rods 202 can be hinged from either the front or back of the hinge component 204, using pins for hinge connection. Furthermore, the two hinged support rods 202 can be pushed or pulled together through their middle hinges, causing the entire annular frame 20 to expand or contract in tandem.

[0042] In this embodiment, the second hinge member 204b has a different shape from the first hinge member 204a. The first hinge member 204a includes a hinge portion 205c and a support portion 205d integrally extending from the hinge portion 205c. The hinge portion 205c is provided with the aforementioned hinge points 205a and 205b. The support portion 205d is used to support the tissue end face and is provided with a suture hole 208 for sutures to pass through and temporarily fix the first hinge member 204a to the tissue surface. The second hinge member 204b and the first hinge member 204a are alternately located at the vertices of the polygons of each first part 22 and second part 24. By setting the hinge position relationship between each support rod 202 of the second part 24 and one support rod 202 of the first part 22, each first hinge member 204a can be located at a high vertex of the annular frame 20.

[0043] With the above arrangement, the first part 22 and the second part 24 are interlocked, and both the first part 22 and the second part 24 are quadrilateral ring structures, forming four vertices at the proximal end of the entire ring frame 20 and four vertices at the distal end of the ring frame 20. The two hinged support rods 202 form a scissor-like hinge, thereby forming multiple openings 210a at the proximal and distal ends of the ring frame 20. The openings 210a at the proximal end of the ring frame 20 effectively expand the surgical operating space within the same expansion area.

[0044] Since the second part 24 and the first part 22 are intertwined, with one part of the second part 24 being higher than the first part 22 and another part being lower than the first part 22, the entire annular frame 20 is a three-dimensional structure. When the annular frame 20 expands, it can fit into a tissue incision with a certain thickness, and the annular frame 20 can be used to expand the tissue from the distal end to the proximal end.

[0045] In this invention, since the first part 22 and the second part 24 are fixed to different components of the control assembly 30, namely the base 34 and the drive shaft 32, the base 34 and the drive shaft 32 can move relative to each other. That is, when one of them is fixed in the axial direction, the other can move in the axial direction, thereby moving the connected first part 22 or the second part 24. Furthermore, since the first part 22 and the second part 24 are hinged to each other, when one of the first part 22 and the second part 24 moves, the other is driven to expand or contract in the radial direction, thereby pushing or pulling the entire annular frame 20 to expand or contract.

[0046] To better illustrate the expansion and contraction of the annular frame 20 described above, in this embodiment, the starting end 2021 of the first portion 22 is connected to the base 34, and the starting end 2022 of the second portion 24 is connected to the drive shaft 32. In other embodiments, since there is a gap between the drive shaft 32 and the base 34, relative movement is possible. The doctor can drive the drive shaft 32 or drive the base 34, thus the first portion 22 and the second portion 24 can achieve relative movement, and when one moves, the other is fixed at its axial point, i.e., the starting end of the first portion 22 or the second portion 24 (see...). Figure 3 The 2021 or 2022 model has not been moved axially, meaning that at least a portion of it remains fixed in its axial position.

[0047] Specifically, the adjacent ends of the two support rods 202 of the first part 22 serve as the starting ends 2021 of the first part 22, which are hinged to the two hinge points of a second hinge member 204b, which is fixed to the base 34. The adjacent ends of the two support rods 202 of the second part 24 serve as the starting ends 2022 of the second part 24, which are hinged to the two hinge points of a second hinge member 204b, which is fixed to the distal end of the drive shaft 32.

[0048] Please refer to the following: Figure 6-8 The base 34 preferably includes a connecting seat 34a and a tubular component 34b fixedly connected to or integrally formed with the connecting seat 34a. The connecting seat 34a is located at the proximal end, and the tubular component 34b is located at the distal end. The drive shaft 32 passes through the connecting seat 34a and the tubular component 34b and extends out of the tubular component 34b. The starting end 2021 of the first part 22 is fixed to the tubular component 34b by a second hinge member 204b and a fixing member 204e. The starting end 2022 of the second part 24 is connected to the distal end of the drive shaft 32 by a second connecting member 204b and a fixing member 204c. The second part 24 moves radially with the drive shaft 32, causing the first part 22 to expand or contract in a coordinated manner.

[0049] The annular frame 20 can be directly expanded to its maximum extent. Preferably, to adapt to the needs of different surgical spaces, the annular frame 20 can be expanded to different states (e.g., Figure 1 and Figure 2 (In different states), the aforementioned locking component 30 can help lock that state.

[0050] Specifically, the aforementioned connecting seat 34a is provided with the external thread, and the locking threaded component 36 includes an internal thread 360. The locking threaded component 36 is threadedly connected to the connecting seat 34a. In this embodiment, the abutment 38 is a spherical body, the locking threaded component 36 further includes a pressing inclined surface 36b, and the connecting seat 34a further includes a channel 34e penetrating its inner and outer walls. The abutment 38 is accommodated in the channel 34e and is located between the pressing inclined surface 36b and the drive shaft 32.

[0051] The compression bevel 36b is located near the proximal end of the internal thread 360, and the distance between the compression bevel 36b and the connecting seat 34a is smaller near the distal end and larger near the proximal end. When the doctor holds the connecting seat 34a and rotates the locking thread 36, the locking thread 36 moves along the connecting seat 34a, and therefore the compression bevel 36b moves along the connecting seat 34a, so that different positions of the compression bevel 36b face the abutment 38, thereby the compression bevel 36b contacting or separating from the abutment 38.

[0052] In this embodiment, to limit the distance that the locking threaded component 36 can rotate relative to the connecting seat 34a, a limiting structure 34c is provided on the tube body 34b. Specifically, the limiting structure 34c is a boss protruding from the tube body 34b. When the lower end of the locking threaded component 36 or the lower end of the internal thread 360 abuts against the limiting structure 34c, the locking threaded component 36 can no longer move to the far end, thereby limiting the excessive movement of the locking threaded component 36.

[0053] When the abutment 38 contacts the compression ramp 36b, the abutment 38 is pressed against the drive shaft 32 by the pressure of the compression ramp 36b, thereby locking the drive shaft 32 and the base 34 relative to each other, which is a locked state. See [link to documentation]. Figure 8 The state of 8B. When the abutment 38 is not in contact with the pressing slope 36b, or the contact is not tight enough that the pressing slope 36b does not exert pressure on the abutment 38, the abutment 38 cannot exert a strong abutment on the drive shaft 32. At this time, the drive shaft 32 and the entire base 34 can move relative to each other, which is the unlocked state. See 8B. Figure 8 The state of 8A in the middle.

[0054] When the drive shaft 32 pushes to the distal end, it increases the axial distance between the second part 24 and the fixed position of the first part 22. At this time, the distance between the starting end 2022 of the second part 24 and the starting end 2021 of the first part 22 increases, causing the support rod 202 of the second part 24 to tend to stand up, and the entire annular structure 20 to contract to its minimum state. When the drive shaft 32 pulls back to the proximal end, it decreases the axial distance between the second part 24 and the fixed position of the first part 22. During the process of the distance between the starting end 2022 of the second part 24 and the starting end 2021 of the first part 22 decreasing, the support rod 202 of the second part 24 causes the support rod 202 of the first part 22 to unfold. When the axial distance between the starting ends 2021 and 2022 is at its minimum, the included angle A between the two hinged support rods corresponding to this axial direction (see...) Figure 3 The complementary angle B (see also) reaches its minimum. Figure 3 Then it reaches its maximum, that is, the two hinged support rods 202 open to the maximum extent in a scissor-like manner, that is, the entire ring frame 20 opens to the maximum extent.

[0055] Please refer to it again. Figure 3 Since the second hinge member 204b of the starting end 2022 of the second part 24 is fixed to the drive shaft 32, when the distance between the starting end 2022 of the second part 24 and the starting end 2021 of the first part 22 decreases, the entire annular frame 20 gradually opens to its maximum extent. To limit the maximum extent of the opening of the annular frame 20, a limiting component can be provided. For example, please refer to [reference needed]. Figure 6 The limiting component may include a sleeve 204d disposed on the fixing member 204c of the second hinge member 204b. The drive shaft 32 passes through the sleeve 204d. The inner diameter of the sleeve 204d is smaller than the outer dimension of the fixing member 204e of the second hinge member 204b at the starting end 2021 of the first part 22. Therefore, when the drive shaft 32, together with the starting end 2022 of the second part 24, the second hinge member 204b, the fixing member 204c and the sleeve 204d, move proximally, when the sleeve 204d contacts the fixing member 204e and can no longer move, it indicates to the doctor that the limit position has been reached.

[0056] Please refer to the following: Figure 1 and Figure 7To facilitate operation by doctors, the tissue retractor 100 of the present invention further includes a gripping assembly 40 detachably connected to the proximal end of the locking assembly 30. The gripping assembly 40 has an operating lever 41 detachably connected to the drive shaft 32, and a grip handle 42 located proximal to the operating lever 41 for easy gripping by the doctor. This detachable connection can be achieved through a detachable connection structure, such as a threaded connection. After the locking thread 36 is loosened from the abutment 38, the doctor can push or pull the operating lever 41 to move the drive shaft 32 axially. After the locking thread 36 is tightened to contact the abutment 38, the tissue retractor 100 is locked.

[0057] Please see Figure 9-10 A second embodiment of the present invention provides a control component 50 for a tissue spreading device, which differs from the control component 30 of the first embodiment in that the abutment 58 of the control component 50 is a clamping sleeve. The outer surface of the abutment 58 has a compression bevel 58a. The locking threaded component 56 includes a threaded portion 56a and a stepped portion 56b. The threaded portion 56a is threaded to engage with the threaded portion 54a of the base 54, and the stepped portion 56b is used to engage with the compression bevel 58a of the abutment 58. The threaded portion 54a of the locking threaded component 56 is located at the proximal end to facilitate engagement with the base 54; the steps of the stepped portion 56b have an inclination, such that the inner diameter of the inner wall of the stepped portion 56b at the proximal end is larger than the inner diameter of the inner wall at the distal end.

[0058] When the locking threaded part 56 rotates and moves relative to the base 54, the step part 56b and the extrusion slope 58a switch between close contact and no-pressure contact, or even no contact, so that the inner wall of the abutment part 58 is in close contact with the drive shaft 52 and locked, or in no-pressure contact, or even no contact, to unlock the drive shaft 52, so that the drive shaft 52 can be unlocked and moved relative to it.

[0059] Please see Figure 11 The third embodiment of the present invention provides a tissue spreading device 100a, which differs from the tissue spreading device 100 of the first embodiment in that both annular structures of the annular frame 20a of the tissue spreading device 100a are octagonal. In other embodiments, the annular structures may also be other polygons.

[0060] In application, the first embodiment will be used as an example for explanation below. Please refer again. Figure 2 and Figure 3The annular frame 20 of the present invention has different heights from its upper to lower surface in different expansion states, thus making it suitable for use in tissues of different thicknesses, utilizing the outer side of the annular frame 20 to expand the tissue. The height of the annular frame 20 is at its minimum when it is expanded to its maximum extent. The height of the annular frame 20 in different expansion states ranges from 15mm to 25mm, and at its maximum expansion, the height is approximately 15mm.

[0061] In surgical procedures, such as cardiac surgery, the normal mitral valve orifice size is an average width of 23.6 mm and an average length of 31.7 mm. After a diseased mitral valve, both the length and width of the orifice increase by 0-30%. The expanded size of the tissue retractor 100 needs to be larger than this mitral valve orifice to allow for the relevant surgery. Sufficient surgical space must also be provided for the surgeon's manipulation. Surgeries on cardiac tissue, such as mitral valve annulus repair, typically require sutures around the valve orifice. This necessitates adding 15-25 mm of space circumferentially to the atrial tissue above the mitral valve orifice. However, a larger expansion range of the tissue retractor 100 results in greater tissue damage. Therefore, considering all factors, the maximum width of the expanded tissue retractor 100 should not exceed 80 mm, and its height should be approximately 20 mm, to ensure it fits snugly against the cut atrial wall during cardiac surgery.

[0062] It should be noted that, due to the gap between the drive shaft 32 and the tube body 34b in this invention, and because it is operated by the doctor's hand, the doctor can choose to hold the drive shaft 32 or the grip component 40 connected to the drive shaft 32 to push or pull the drive shaft 32 relative to the base 34. Alternatively, the doctor can hold the base 34 or the locking threaded component 36 connected to the base 34 and move it axially, thereby fixing at least a portion of one of the first part 22 and the second part 24 in one axial direction, while allowing the other to move in the same axial direction. Both methods can achieve linkage between the first part 22 and the second part 24, causing the entire annular frame 20 to expand or contract. Generally, it is more convenient to drive the drive shaft 32 relative to the base 34 by holding the grip component 40.

[0063] Please refer to the following: Figure 3 , Figure 12 and Figure 13Taking the surgical repair of the mitral valve as an example, an incision is made in the chest cavity, and a surgical incision is made in the atrium 200 to expose the mitral valve 300 between the atrium and ventricle. Then, the distal end of the contracted tissue expander 100 is inserted into the atrial incision. At this time, the surgeon can rotate the locking thread 36 to release the abutment 38 from the drive shaft 32. The drive shaft 32 can then be pulled proximally to expand the annular frame 20. When the annular frame 20 reaches the desired size, the surgeon can rotate the locking thread 36 to re-engage the abutment 38 with the drive shaft 32 to fix the size of the annular frame 20. Thus, the entire periphery of the annular frame 20 expands the atrial tissue 250, and the surgery on the mitral valve 300 below the atrium 200 can then begin.

[0064] Because the operating space for mitral valve surgery is limited, and the operating lever 41 of the grip assembly 40 is relatively long, it may obstruct the entry of surgical instruments. Therefore, after the annular frame 20 has expanded to the ideal size and the locking member 34 has been locked, the surgeon can rotate the grip assembly 40 to disengage the operating lever 41 from the drive shaft 32, effectively expanding the space around the surgical site. A typical mitral valve surgery involves placing an annulus meniscus to repair the mitral valve annulus.

[0065] After the mitral valve surgery, the doctor can directly grasp the connecting seat 34a of the locking assembly 30 to remove the entire tissue-opening device 100.

[0066] In summary, the tissue spreading device 100 of the present invention is used to spread tissue, expand the surgical operating space, and prevent the tissue from affecting the position to be operated on. The axial movement of the drive shaft 32 allows the annular frame 20 to expand or contract, eliminating the need for additional control wires to control expansion or contraction. The annular frame 20 consists only of support rods and hinged components, simplifying the instrument and making it easy for doctors to operate. Furthermore, the support rods of the annular frame 20 do not need to be deformable and can be made of hard metals such as stainless steel.

[0067] The tissue stretching device 100 of the present invention is used as an auxiliary instrument in surgical procedures to stretch tissues, including suturing or other repair procedures.

[0068] The above are some embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A tissue spreading device, characterized in that, A ring frame comprising a first part and a second part hinged to each other, the ring frame being expandable and contractable by driving the first part or the second part, the ring frame being used to stretch tissue when expanding; as well as A control component for controlling the movement of the annular frame includes a drive shaft, a base, a locking threaded component, and an abutment. The base is hollow and has external threads. The drive shaft passes through the base. A first portion is connected to the base, and a second portion is connected to the drive shaft. The locking threaded component is threadedly connected to the base. The abutment is disposed between the locking threaded component and the drive shaft and abuts or separates from the drive shaft as the locking threaded component rotates, thereby locking or allowing the drive shaft to move relative to the base.

2. The tissue spreading device as described in claim 1, characterized in that, The first part and the second part are each a ring structure, the ring structure including a plurality of hinged support rods, and each of the support rods of the second part is hinged to one of the support rods of the first part.

3. The tissue spreading device as described in claim 2, characterized in that, The base includes a connecting seat and a tubular component fixedly connected to the connecting seat. The connecting seat is located at the proximal end, and the tubular component is located at the distal end. The drive shaft passes through the connecting seat and the tubular component. The connecting seat is provided with the external thread. At least a portion of the first part is fixed to the tubular component, and the second part is connected to the distal end of the drive shaft. The second part moves with the axial movement of the drive shaft, causing the first part to expand or contract radially in linkage.

4. The tissue spreading device as described in claim 3, characterized in that, When the axial distance between the distal end of the drive shaft and the fixed position of the first part increases, the second part causes the first part to contract; when the axial distance between the distal end of the drive shaft and the fixed position of the first part decreases, the second part causes the first part to expand.

5. The tissue spreading device as described in claim 2, characterized in that, The first part and the second part each include a plurality of hinge members, wherein the middle portion of each of the support rods in the first part is hinged to the middle portion of one of the support rods in the second part, each pair of adjacent support rods in the first part is hinged to a different hinge point of a hinge member, and each pair of adjacent support rods in the second part is hinged to a different hinge point of a hinge member.

6. The tissue spreading device as described in claim 3, characterized in that, The tube body is provided with a limiting structure to limit the distance the locking threaded part moves relative to the connecting seat.

7. The tissue spreading device as described in claim 1, characterized in that, The locking threaded component includes an internal thread and a pressing bevel. The abutting component is a spherical body. The base includes an external thread and a channel penetrating the base. The spherical body is housed in the channel and abuts against the drive shaft when pressed by the pressing bevel as the locking threaded component moves.

8. The tissue spreading device as described in claim 1, characterized in that, The locking threaded component includes an internal thread and a stepped surface. The abutment is a clamping sleeve. The drive shaft passes through the abutment. The abutment has a pressing slope. When the pressing slope is pressed by the stepped surface as the locking threaded component moves, the abutment abuts against the drive shaft.

9. The tissue spreading device as described in claim 3, characterized in that, It also includes a grip handle, which includes an operating lever that extends into the connector and is detachably connected to the drive shaft.

10. The tissue spreading device as described in claim 5, characterized in that, The first part and the second part are respectively formed by four support rods hinged together by the hinge member to form a quadrilateral structure, or by eight support rods hinged together by the hinge member to form an octagonal structure.

11. The tissue spreading device as described in claim 10, characterized in that, The height of the ring frame when it expands is between 15mm and 25mm, and the maximum width of the ring frame on a plane after it expands to its maximum extent does not exceed 80mm.

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