Amniotic membrane precutter

Abstract

The invention relates to the technical field of medical instruments, in particular to an amniotic membrane precutter which comprises a pressing part, a drill rod part is fixedly connected to the bottom of the pressing part, and a trephine tool bit is detachably connected to the bottom of the drill rod part; the tool face of the trephine tool bit is in the shape of a circle with a pedicle, and a cutting assembly used for pre-cutting the amniotic membrane is arranged on the drill rod part. The tool face of the trephine tool bit is made into a circle with a pedicle. When the pedicle of the tool face of the trephine tool bit is located below the circle, the connecting pedicle and the circle center line form an L shape. The front and back surfaces of the amnion can be completely correctly identified in a vitreous body operation, and the operation success rate is improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an amniotic membrane pre-cutter. Background Art

[0002] Human amniotic membrane (hAM) is a translucent sheet with a thickness of about 0.02-0.05 mm. It contains epithelial cells, basement membrane, compact layer, fibroblast layer and spongy layer. hAM is rich in EGF, bFGF, keratinocyte GF, TGFα and TGFβ, and is known to have anti-inflammatory, anti-fibrotic, anti-microbial and anti-angiogenic properties and low immunogenicity. The production of hAM is easy to obtain and its safety has been confirmed. Due to these properties and the potential to integrate into host tissues, hAM grafts / patches are widely used for ocular surface reconstruction. Experimental studies have shown that human RPE cells can be cultured and grown on hAM, maintain an epithelial phenotype, and secrete various growth factors involved in retinal homeostasis. Based on this evidence, hAM can be used to treat retinal holes. At present, hAM treatments for diseases associated with retinal holes include: large diameter macular holes, persistent or recurrent MH, high myopia paravascular tears, complex rhegmatogenous retinal detachments, and serous macular detachments caused by optic disc pits.

[0003] The currently reported method for identifying the front and back sides of the amnion during vitrectomy combined with amnion transplantation is usually to detect the sticky side of the amnion with glass tweezers. However, this method relies on the doctor's experience and may lead to incorrect confirmation of the chorionic surface, which may lead to surgical failure and the need to re-fix the graft. Manual trimming of the amnion may also cause damage to the amnion graft. In the prior art, although the use of a skin perforator to make an amnion graft can avoid damage caused by trimming with microscissors and tweezers, it is difficult to distinguish the front and back of the cut amnion graft.

[0004] In summary, how to solve the problem in the prior art that although the use of a skin perforator to make an amniotic membrane graft can avoid damage caused by trimming with microscissors and tweezers, the problem that the cut amniotic membrane graft is difficult to distinguish the front and back sides has become a difficult problem that needs to be urgently solved in this field. Therefore, it is necessary to propose an amniotic membrane pre-cutter. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an amniotic membrane pre-cutting knife, which is used to accurately cut the amniotic membrane and can effectively distinguish the front and back sides of the amniotic membrane graft, thereby avoiding surgical failure due to misclassification and reducing damage to the amniotic membrane graft.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: an amniotic membrane pre-cutting knife, comprising a pressing part, a drill rod part is fixedly connected to the bottom of the pressing part, and a trepanation cutter head is detachably connected to the bottom of the drill rod part; the blade surface of the trepanation cutter head is circular with a pedicle, and the drill rod part is provided with a cutting component for pre-cutting the amniotic membrane.

[0007] The technical principles of the above scheme are as follows:

[0008] The blade of the trephine cutter head is made into a circle with a pedicle. When the amniotic membrane is pre-cut during the process of making an amniotic membrane graft, the amniotic membrane is placed with the chorionic layer downward and the amniotic layer upward, and the pedicle of the blade of the trephine cutter head is rotated to the bottom of the circle. The amniotic membrane graft used for surgery is then cut off using the trephine cutter head. At this time, the connecting pedicle on the front side of the amniotic membrane graft and the center line of the circle form an "L" shape; if the medical staff places the back side of the amniotic membrane graft upward during the use of the amniotic membrane graft, the connecting pedicle on the back side of the amniotic membrane graft and the center line of the circle form a "" shape. At this time, the amniotic membrane graft only needs to be turned over and used without remaking; by identifying the direction of the connecting pedicle of the amniotic membrane graft, the front and back sides of the amniotic membrane graft can be distinguished; at the same time, the cutting component can quickly cut the amniotic membrane when making the amniotic membrane graft.

[0009] The above scheme has the following beneficial effects:

[0010] 1. In the present invention, the blade surface of the trephine cutter head is made into a circle with a pedicle. When the chorionic layer of the amniotic membrane graft is facing downward and the pedicle of the blade surface of the trephine cutter head is located below the circle, the pedicle and the center line of the circle are connected to form an "L" shape. This can ensure that the front and back sides of the amniotic membrane are identified correctly during vitreous surgery, thereby improving the success rate of the surgery.

[0011] 2. The present invention can quickly cut the amniotic membrane when making the amniotic membrane graft by arranging a cutting assembly on the drill rod. This not only shortens the surgical preparation time and improves the surgical efficiency, but also reduces the exposure time of the amniotic membrane to the external environment, reduces the risk of contamination or damage to the amniotic membrane, and ensures the quality and safety of the amniotic membrane graft.

[0012] 3. Traditional manual operation is prone to irregular edges, tearing or damage of the amniotic membrane graft due to direct contact of instruments and uneven force during operation, affecting its fit and function during surgery. The present invention uses a specific trephine cutter head and a cutting assembly to work together to cut the amniotic membrane in a precise and stable manner, thus avoiding damage caused by trimming with microscissors and tweezers.

[0013] Furthermore, the cutting assembly comprises a spring and a base, and the spring is sleeved on the drill rod portion.

[0014] A slide groove is opened on the top of the base, and a support plate is slidably matched on the slide groove. A support plate is fixedly connected to the top of the base, and a top plate is fixedly connected to the top of the support plate. The drill rod part passes through the top plate and slides with the top plate. One end of the spring is fixedly connected to the pressing part, and the other end of the spring is fixedly connected to the top plate.

[0015] An L-shaped connecting rod is fixedly connected to the side wall of the drill rod part, an I-shaped bracket is hinged at one end of the L-shaped connecting rod away from the drill rod part, one end of the I-shaped bracket is hinged to the side wall of the support plate, and the other end of the I-shaped bracket is rotatably matched with a spreading wheel.

[0016] A first connecting rod is hinged on one side wall of the I-shaped bracket, a second connecting rod is hinged on one end of the first connecting rod away from the I-shaped bracket, the second connecting rod and the side wall of the support plate are rotatably matched, a third connecting rod is hinged on one end of the second connecting rod away from the first connecting rod, and the third connecting rod is hinged on one end of the third connecting rod away from the second connecting rod and the side wall of the support plate.

[0017] Beneficial effect: When the pressing part is pressed, the drill rod moves downward and the spring is compressed. After the pressing is completed, the elastic potential energy stored in the spring can quickly bounce the drill rod upward to prepare for the next cutting operation. The movement of the drill rod is transmitted to the I-shaped bracket through the L-shaped connecting rod. When the drill rod moves up and down, the L-shaped connecting rod drives the I-shaped bracket to make a circular motion around the hinge point with the support plate, so that the spreading wheel can roll on the surface of the amniotic membrane. The rolling of the spreading wheel acts on the amniotic membrane and can spread the amniotic membrane flatly. This process is carried out before cutting to ensure that the amniotic membrane is in an ideal flat state and avoid inaccurate cutting or damage to the amniotic membrane due to wrinkles in the amniotic membrane.

[0018] Furthermore, a groove is formed on the top of the support plate.

[0019] Beneficial effect: The groove can facilitate the placement of the glass slide with the amniotic membrane spread, increasing the stability during cutting.

[0020] Furthermore, a first silicone rubber layer is fixedly connected to the bottom of the base.

[0021] Beneficial effect: The silicone rubber layer has good anti-slip properties, which can fix the pre-cutting knife in place when it is placed on an operating table or other operating plane, and is not prone to sliding.

[0022] Furthermore, a second silicone rubber layer is sleeved on the pressing portion.

[0023] Beneficial effect: The second silicone rubber layer can provide doctors with a better grip feel, increase the friction between the hand and the pressing part, and make the doctor more stable and less likely to slip when operating the pressing part.

[0024] Furthermore, the detachable connection between the trepanation cutter head and the drill rod portion is a detachable threaded connection.

[0025] Beneficial effects: Through the threaded connection, doctors can easily and quickly disassemble and replace the trephine cutter head, and can also adapt to conventional trephine cutter heads.

[0026] Furthermore, a third silicone rubber layer is sleeved on the spreading wheel.

[0027] Beneficial effects: The soft texture of the silicone rubber layer can spread the amniotic membrane evenly on the glass slide without damaging the amniotic membrane, ensuring that the amniotic membrane is flat before cutting. The material properties of the silicone rubber layer can also prevent the spreading wheel from generating static electricity when in contact with the amniotic membrane, avoiding wrinkles in the amniotic membrane or adsorption of impurities such as dust due to static adsorption, thus ensuring the cleanliness and integrity of the amniotic membrane.

[0028] Furthermore, the circular diameter of the blade surface of the trepanning cutter head is in the range of 1.5-5.0 mm.

[0029] Beneficial effects: Retinal tears vary in size and require amniotic membrane grafts of different sizes for repair. The circular diameter of the trephine blade is set in the range of 1.5-5.0mm, which can meet the treatment needs of a variety of common retinal tears.

[0030] Furthermore, the circular pedicled portion of the blade surface of the trephine cutter head has a width of 1.0 mm.

[0031] Beneficial effects: The circular pedicled part of the blade of the trephine cutter head is 1.0 mm wide, which enables the doctor to use microscissors to easily cut off the pedicle of the cut amniotic membrane graft during surgical transplantation. At this time, the amniotic membrane graft can be directly used for transplantation without excessive trimming of other parts of the amniotic membrane graft, thereby improving the convenience of the doctor during the transplantation operation.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front view of the amniotic membrane pre-cutting knife of the present invention.

[0034] Figure 2 It is a bottom view of the trephine cutter head in the amniotic membrane pre-cutter of the present invention.

[0035] Figure 3 It is an axonometric view of the cutting assembly in the amniotic membrane pre-cutter of the present invention.

[0036] The figure marks in the drawings of the specification include: 1. pressing part; 2. drill rod part; 3. ring drill cutter head; 4. spring; 5. base; 6. slide groove; 7. support plate; 8. top plate; 9. support plate; 10. L-shaped connecting rod; 11. I-beam bracket; 12. spreading wheel; 13. first connecting rod; 14. second connecting rod; 15. third connecting rod; 16. groove. DETAILED DESCRIPTION

[0037] The following is further described in detail through specific implementation methods:

[0038] Embodiment 1:

[0039] As attached Figure 1-Figure 3 As shown: an amniotic membrane pre-cutting knife comprises a pressing part 1, a drill rod part 2 is integrally formed at the bottom of the pressing part 1, a trepanation cutter head 3 is detachably connected to the bottom of the drill rod part 2 via a thread; the blade surface of the trepanation cutter head 3 is circular with a pedicle, and a cutting component for pre-cutting the amniotic membrane is provided on the drill rod part 2.

[0040] The cutting assembly comprises a spring 4 and a base 5 , and the spring 4 is sleeved on the drill rod part 2 .

[0041] A slide groove 6 is provided on the top of the base 5, and a support plate 7 is slidably fitted on the slide groove 6. A support plate 9 is integrally formed on the top of the base 5, and a top plate 8 is integrally formed on the top of the support plate 9. The drill rod portion 2 passes through the top plate 8 and slidably fits with the top plate 8. One end of the spring 4 is fixedly connected to the pressing portion 1 by a screw, and the other end of the spring 4 is fixedly connected to the top plate 8 by a screw.

[0042] An L-shaped connecting rod 10 is integrally formed on the side wall of the drill rod part 2. An I-shaped bracket 11 is hingedly connected to one end of the L-shaped connecting rod 10 away from the drill rod part 2. One end of the I-shaped bracket 11 is hingedly connected to the side wall of the support plate 9. The other end of the I-shaped bracket 11 is rotatably matched with a spreading wheel 12.

[0043] A first connecting rod 13 is hinged on one side wall of the I-shaped bracket 11, a second connecting rod 14 is hinged on one end of the first connecting rod 13 away from the I-shaped bracket 11, the second connecting rod 14 and the side wall of the support plate 9 are rotatably matched, a third connecting rod 15 is hinged on one end of the second connecting rod 14 away from the first connecting rod 13, and the third connecting rod 15 is hinged to the side wall of the support plate 7 at one end away from the second connecting rod 14.

[0044] A groove 16 is formed on the top of the support plate 7 .

[0045] A first silicone rubber layer is fixedly bonded to the bottom of the base 5 .

[0046] The pressing part 1 is sleeved with a second silicone rubber layer.

[0047] The spreading wheel 12 is sleeved with a third silicone rubber layer.

[0048] The specific implementation process is as follows:

[0049] When using the amniotic membrane pre-cutting knife, the doctor first removes the amniotic membrane from the preservation solution, gently rinses the amniotic membrane with a balanced salt solution, and removes the preservation solution components remaining on the amniotic membrane; then uses micro forceps to clamp the edge of the amniotic membrane, and then spreads the amniotic membrane flat on the glass slide with the chorionic layer downward and the amniotic layer upward, trying to keep the amniotic membrane wrinkle-free, and then places the glass slide in the groove 16 at the top of the support plate 7; the groove 16 can effectively fix the glass slide and increase the stability of the amniotic membrane during pre-cutting.

[0050] Then the pre-cutting operation is started. Since the first silicone rubber layer is fixedly bonded to the bottom of the base 5, its good anti-slip property allows the pre-cutting knife to be stably placed on the operating table without sliding easily.

[0051] The doctor's hand is placed on the pressing part 1. Since the pressing part 1 is covered with a second silicone rubber layer, it provides the doctor with a better grip feeling and increases the friction between the doctor's hand and the pressing part 1, making the doctor more stable and less likely to slip during operation.

[0052] by Figure 3 For example, when the doctor presses the pressing part 1, the drill rod part 2 moves downward, and the spring 4 sleeved on the drill rod part 2 is compressed to store elastic potential energy. The drill rod part 2 moves downward, driving the L-shaped connecting rod 10 to press the I-shaped bracket 11 downward, and the I-shaped bracket 11 rotates counterclockwise around the hinge point with the support plate 9, thereby driving the spreading wheel 12 to move to the bottom and contact the amniotic membrane on the glass slide in the groove 16. At this time, the I-shaped bracket 11 can push the first connecting rod 13 to move rightward. Since the second connecting rod 14 is hinged to the first connecting rod 13, the second connecting rod 14 is rotatably connected to the side wall of the support plate 9, the second connecting rod 14 is hinged to the third connecting rod 15, and the third connecting rod 15 is hinged to the side wall of the support plate 7. At this time, when the first connecting rod 13 moves to the right, due to the lever principle, the third connecting rod 15 can move to the left, driving the support plate 7 to move to the left in the slide groove 6, and the support plate 7 drives the glass slide to move to the left.

[0053] Likewise Figure 3 For example, when the spreading wheel 12 contacts the amniotic membrane on the glass slide and the glass slide moves to the left, the spreading wheel 12 starts to roll on the surface of the amniotic membrane due to the rotation and coordination of the spreading wheel 12 and the I-shaped bracket 11. Since the spreading wheel 12 is provided with a third silicone rubber layer, the soft nature of the third silicone rubber layer can roll the amniotic membrane on the glass slide more flatter without damaging the amniotic membrane, thereby ensuring that the amniotic membrane is in a flat state before cutting, and preventing the generation of electrostatic adsorption that causes wrinkles in the amniotic membrane or adsorption of dust and impurities.

[0054] by Figure 1 and Figure 2For example, when the trephine cutter head 3 continues to contact the amniotic membrane downward, the trephine cutter head 3 can cut off the amniotic membrane graft used for surgery; at this time, the connecting pedicle and the center line of the amniotic membrane graft form an "L" shape; the doctor uses microtweezers to clamp the connecting pedicle of the amniotic membrane graft, places the amniotic membrane graft in a culture dish containing a balanced salt solution for cleaning, and then performs the amniotic membrane graft transplantation operation; if the medical staff places the amniotic membrane graft with the back side facing up during the use of the amniotic membrane graft, the chorionic layer of the amniotic membrane graft is facing up and the amniotic layer is facing down, and the connecting pedicle and the center line of the amniotic membrane graft form a "" shape. At this time, you only need to turn the amniotic membrane graft over so that the connecting pedicle and the center line of the amniotic membrane graft form an "L" shape, and it can be used without remaking; by identifying the direction of the connecting pedicle of the amniotic membrane graft, the front and back sides of the amniotic membrane graft can be distinguished.

[0055] After the amniotic membrane graft is cut, the doctor releases the pressing part 1, and the elastic potential energy stored in the spring 4 is released, which can bounce the drill rod part 2 upward. At the same time, the drill rod part 2 drives the L-shaped connecting rod 10 and then drives the I-shaped bracket 11, and then drives the support plate 7 to return to its original position, preparing for the next cutting operation.

[0056] If it is necessary to replace the trephine cutter head 3 of different specifications to adapt to retinal holes of different sizes, since the trephine cutter head 3 and the drill rod part 2 are detachably connected by threads, the doctor can easily and quickly disassemble and replace it, and this connection method can also be adapted to conventional trephine cutter heads 3.

[0057] Through the above operation process, the amniotic membrane pre-cutting knife of the present invention can be used to quickly cut the amniotic membrane, effectively distinguish the front and back sides of the amniotic membrane graft, and reduce damage to the amniotic membrane graft. This not only shortens the surgical preparation time and improves surgical efficiency, but also reduces the length of time the amniotic membrane is exposed to the external environment, reduces the risk of contamination or damage to the amniotic membrane, and ensures the quality and safety of the amniotic membrane graft.

[0058] Embodiment 2:

[0059] The difference from the embodiment 1 is that the circular diameter of the blade surface of the trepanning cutter head 3 is in the range of 1.5-5.0 mm.

[0060] The specific implementation process is as follows:

[0061] Retinal tears vary in size and require amniotic membrane grafts of different sizes for repair. The circular diameter of the three blades of the trephine head is set in the range of 1.5-5.0mm, which can meet the treatment needs of a variety of common retinal tears.

[0062] Embodiment 3:

[0063] The difference from the second embodiment is that the width of the circular pedicled portion of the blade surface of the trephine cutter head 3 is 1.0 mm.

[0064] The specific implementation process is as follows:

[0065] The circular pedicled part of the blade of the trephine cutter head 3 has a width of 1.0 mm, which enables the doctor to use microscissors to conveniently cut off the pedicle of the cut amniotic membrane graft during surgical transplantation. At this time, the amniotic membrane graft can be directly used for transplantation without excessive trimming of other parts of the amniotic membrane graft, thereby improving the convenience of the doctor during the transplantation operation.

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An amniotic membrane pre-cutter, comprising a pressing portion (1), characterized in that: The bottom of the pressing part (1) is fixedly connected to a drill rod part (2), and the bottom of the drill rod part (2) is detachably connected to a ring drill cutter head (3); The blade surface of the trephine cutter head (3) is circular with a pedicle; The drill rod part (2) is provided with a cutting assembly for pre-cutting the amniotic membrane.

2. The amniotic membrane pre-cutter according to claim 1, characterized in that: The cutting assembly comprises a spring (4) and a base (5); the spring (4) is sleeved on the drill rod part (2); A slide groove (6) is provided on the top of the base (5), and a support plate (7) is slidably fitted on the slide groove (6); A support plate (9) is fixedly connected to the top of the base (5), a top plate (8) is fixedly connected to the top of the support plate (9), and the drill rod portion (2) passes through the top plate (8) and is slidably matched with the top plate (8); one end of the spring (4) is fixedly connected to the pressing portion (1), and the other end of the spring (4) is fixedly connected to the top plate (8); An L-shaped connecting rod (10) is fixedly connected to the side wall of the drill rod portion (2); an end of the L-shaped connecting rod (10) away from the drill rod portion (2) is hingedly connected to an I-shaped bracket (11); one end of the I-shaped bracket (11) is hingedly connected to the side wall of the support plate (9); and the other end of the I-shaped bracket (11) is rotatably matched with a spreading wheel (12); A first connecting rod (13) is hinged on one side wall of the I-shaped bracket (11); a second connecting rod (14) is hinged on one end of the first connecting rod (13) away from the I-shaped bracket (11); the second connecting rod (14) and the side wall of the support plate (9) are rotatably matched; a third connecting rod (15) is hinged on one end of the second connecting rod (14) away from the first connecting rod (13); and an end of the third connecting rod (15) away from the second connecting rod (14) is hinged to the side wall of the support plate (7).

3. The amniotic membrane pre-cutter according to claim 2, characterized in that: A groove (16) is formed on the top of the supporting plate (7).

4. The amniotic membrane pre-cutting knife according to claim 3, characterized in that: A first silicone rubber layer is fixedly connected to the bottom of the base (5).

5. The amniotic membrane pre-cutting knife according to claim 4, characterized in that: A second silicone rubber layer is sleeved on the pressing portion (1).

6. The amniotic membrane pre-cutting knife according to claim 5, characterized in that: The detachable connection mode between the trepanation cutter head (3) and the drill rod part (2) is a detachable threaded connection.

7. The amniotic membrane pre-cutting knife according to claim 6, characterized in that: A third silicone rubber layer is sleeved on the spreading wheel (12).

8. The amniotic membrane pre-cutting knife according to claim 7, characterized in that: The circular diameter of the blade surface of the trepanation cutter head (3) is in the range of 1.5-5.0 mm.

9. The amniotic membrane pre-cutting knife according to claim 8, characterized in that: The circular pedicled portion of the blade surface of the trephine cutter head (3) has a width of 1.0 mm.

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