CN221731220U - Proliferation membrane separation knife - Google Patents

Abstract

The utility model discloses a proliferation membrane separation knife, a push-telescopic handle and a proliferation membrane separator, and relates to the field of ophthalmic surgical instruments. The proliferation membrane separation knife solves the problem of inconvenience in peeling off the proliferation membrane, and comprises a knife handle and a knife head. The knife tip of the knife head is in an arc shape, and the two plate surfaces of the knife head are respectively a first surface and a second surface. The knife head is bent toward the first surface to form a dihedral angle with an obtuse angle. A blade is arranged on one side of the knife head, and the second surface is a rough surface obtained by sandblasting. The push-telescopic handle is used to install the instrument body of ophthalmic surgery to avoid non-therapeutic trauma during surgery, and comprises a protective cover, a transmission head and a driving member. By pressing the driving member, the front end of the instrument body can be extended from the front end of the protective cover, which is convenient for various operations; when the pressing is released, the driving member is reset, and the front end of the instrument body is retracted into the protective cover. The proliferation membrane separator comprises the above-mentioned proliferation membrane separation knife and the push-telescopic handle. The utility model is used for retinal proliferation membrane peeling surgery.

Description

Proliferation membrane separation knife

Technical Field

The utility model relates to the field of ophthalmic surgical instruments, in particular to a knife used for retinal proliferative membrane peeling surgery, a push-telescopic handle, and a proliferative membrane separator formed by combining the knife and the handle.

Background Art

Retinal proliferative membrane refers to the abnormal proliferation of fibrous or vascular fibrous membrane-like structures on the surface of the retina. Retinal proliferative membrane is usually caused by factors such as inflammation of the retina in the eye and unexplained fundus hemorrhage, which leads to the appearance of an abnormal proliferative membrane on the surface of the retina. It is common in patients with proliferative diabetic retinopathy (PDR) and proliferative vitreoretinopathy (PVR). Patients with this disease often have dense fibrous membrane-like structures on the retinal surface or under the retina, causing tractional retinal detachment, resulting in patients losing their vision or even blindness. The main purpose of proliferative membrane peeling surgery is to completely remove the proliferative membrane at the vitreoretinal interface in the lesion area, relieve traction, restore the retina to its normal position, and improve or restore the patient's vision. When performing retinal proliferative membrane removal surgery, it is necessary to avoid causing iatrogenic retinal tears or retinal vascular damage, which may lead to bleeding. In the past, for tightly adhered membrane-like tissues, such as fibrous proliferative membranes or fibrovascular proliferative membranes, internal limiting membranes, and epiretinal membranes, metal temporal tearing or vitrectomy was often used during surgery, which is likely to cause iatrogenic retinal tears or vascular damage and bleeding. However, the existing surgical methods are not only difficult to separate the fibrovascular proliferative membrane adhered to the retinal blood vessels, but also easily cause iatrogenic damage, increase surgical risks, and affect the patient's prognosis.

Peeling off the proliferative membrane actually includes two steps of repeated operations. The first step is to separate the proliferative membrane from the retina to form a gap. The second step is to insert the vitreous cutting head and gradually remove it until the proliferative membrane is removed as much as possible or the traction is released. The existing cutting tools have smooth surfaces and are provided with blades for cutting operations. However, the friction coefficient of the smooth surface of the cutting tool is small, and the small size makes it inconvenient to peel off the proliferative membrane. The patent with the authorization announcement number CN 219148186 U discloses a proliferative membrane peeling device, including a peeling knife, a connecting handle and a shell. The peeling knife includes a blade and a handle. The blade is scissor-like in design and has double-sided blades. The connecting handle is fixedly connected to the handle or detachably connected. The outer wall of the connecting handle is provided with a shell. The connecting handle can move relative to the shell to adjust the length of the connecting handle. The proliferation membrane stripping device disclosed in this patent adopts a handle that can be connected to the end, which is convenient for cutting operations and easy to clean and disinfect; but the curved tip, scissor-like design and blades on both sides create gaps that are not convenient for entering the proliferation membrane, and the scissor-like opening and closing are difficult to separate or strip the membrane. The currently designed 25G cutting head can complete the steps of shearing and erosion to remove the proliferation membrane, and the scissor-like design is not conducive to the removal and separation of the membrane.

Ophthalmic surgical instruments can be divided into two parts: the handle and the instrument body. The instrument body is used for direct surgical operations, including various knives, pliers, etc. The size of the instrument body is very small and cannot be directly held for operation. The instrument body is installed or connected to the handle so that the doctor can hold the handle to control the instrument body for various operations. According to the characteristics and requirements of ophthalmic surgery, the handle should be high in precision, comfortable to hold, reliable to use and easy to clean. The instrument body is fixedly installed or connected to the handle, and the instrument body and the handle are relatively static. At this time, the instrument body and the handle move completely synchronously, and there is no lag in the instrument body. However, the tip of the instrument body is always exposed, lacking effective protection measures, and the instrument body is prone to non-therapeutic trauma. For example, when the instrument body is a microsurgical instrument such as intraocular forceps and intraocular scissors, the risk of non-therapeutic trauma is relatively high. In order to avoid non-therapeutic trauma during surgery, it is a feasible method to optimize the structure of the handle, set a protective cover on the outside of the instrument body, and the front end of the instrument body can extend out of the protective cover for operation and can be completely retracted into the protective cover.

Utility Model Content

The utility model firstly provides a proliferation membrane separation knife, which solves the problem that the existing proliferation membrane separation knife is inconvenient to perform the proliferation membrane peeling operation.

The utility model adopts the following technical solution to solve the above technical problems: a proliferation membrane separation knife comprises a rod-shaped handle and a knife head connected to one end of the handle, the tip of the knife head is in an arc shape, the knife head is in a strip-shaped shape, the two plate surfaces of the knife head are respectively a first surface and a second surface, the surface between the first surface and the second surface is a side surface, the knife head is bent toward the first surface to form a dihedral angle with an obtuse angle, the edges of the dihedral angle are located on the two plate surfaces and the direction of the edges is perpendicular to the length direction of the handle, a blade is arranged on a single side of the knife head, the blade surface of the blade is located at the junction of the first surface and the side surface and is U-shaped as a whole, and the second surface is a rough surface obtained by sandblasting.

In order to facilitate the operation, the dihedral angle formed by the bending of the blade head is further 155° to 170°. For example, the dihedral angle is 165°, that is, the blade tip is bent by 15° from a straight shape.

In order to make the blade sharp to a moderate degree, further: the dihedral angle between the first surface and the blade face is 120° to 150°. For example, the dihedral angle between the first surface and the blade face is 135°.

The handle of the proliferation membrane separation knife is small in size. In order to facilitate the installation of the handle on the handle and facilitate operation, the handle is further cylindrical.

Since the shape and size of the cross section of the knife handle are different from those of the knife head, in order to avoid sharp edges between the knife handle and the knife head, a transition section is provided between the knife handle and the knife head, and both ends of the transition section are smoothly connected to the knife handle and the knife head respectively.

In order to ensure the strength of the proliferation membrane separation knife and facilitate processing and sterilization, the knife handle, transition section and knife head are integrated into one body and made of stainless steel. For example, the material of the proliferation membrane separation knife is 304 stainless steel.

The following is a recommended size for the blade: Specifically, the blade length is 2.0 mm, the width is 0.3 mm, and the thickness is 0.1 mm.

The beneficial effects of the utility model proliferation membrane separation knife are as follows: the end of the blade head is in an arc shape, which can avoid trauma to other parts during use. The blade head is bent into an obtuse dihedral angle, and the blade head can act between the retina and the proliferation membrane at a near tangent angle, making it more convenient for the operator to perform the surgery. The blade head is provided with a blade on one side, which not only avoids the problem that the blade is provided on both sides and is inconvenient for processing, but also avoids the problem that the blade is too sharp and easily damages the retina and other eye tissues or organs due to the blade being provided on both sides. The second side of the blade head is a rough surface obtained by sandblasting, which increases the friction coefficient of the second side and facilitates the peeling of the cut proliferation membrane.

The utility model also provides a push-to-telescopic handle for installing the instrument body of ophthalmic surgery to avoid non-therapeutic trauma during surgery. The technical solution adopted by the utility model to solve this problem is: a push-to-telescopic handle, including a transmission head, a transmission shaft, a tail handle and a driving member, a through hole is set between the front and rear ends of the transmission head, at least one mounting groove is set on the side of the transmission head, the mounting groove is connected to the through hole and to the rear end face, a connecting part is set at the front end of the transmission shaft, the connecting part is inserted into the mounting groove of the transmission head from the rear end face of the transmission head, the protective sleeve is tubular, the rear end of the protective sleeve is fixed to the connecting part, the protective sleeve is located in the through hole of the transmission head, the front end of the protective sleeve passes through the front end of the through hole, a cylindrical inner tube cavity is set at the center of the front end face of the transmission shaft, the center line of the inner tube cavity coincides with the center line of the transmission shaft, and a cylindrical inner tube cavity is placed in the inner tube cavity. A movable pin is arranged, and the moving direction of the movable pin in the inner tube cavity is consistent with the center line direction of the inner tube cavity. The front end of the movable pin is fixedly connected to the rear end of the transmission head. A mounting position is arranged at the center of the front end surface of the movable pin, and the center line of the protective sleeve passes through the mounting position. An expanded diameter end is arranged at the rear end of the movable pin. A spring is passed through the outer side of the movable pin, and the front end of the spring is tightly matched with the boss in the inner tube cavity of the transmission shaft, and the rear end of the spring is tightly matched with the expanded diameter end of the movable pin. The rear end of the transmission shaft is fixedly connected to the tail handle, and a driving member is passed through the outer side of the transmission shaft. The driving member is a tubular structure that is circumferentially pressed and axially telescopically moved. The front end of the driving member is fixedly connected to the transmission head, and the rear end of the driving member is fixedly connected to the tail handle or the transmission shaft.

In order to ensure that the protective cover can be more firmly installed on the connecting part of the transmission shaft, further: two connecting parts are arranged at the front end of the transmission shaft, the two connecting parts are symmetrically arranged on both sides of the center line of the transmission shaft, at least one group of screw holes are arranged at the two connecting parts, the center lines of the two screw holes in the same group coincide, fixing bolts are arranged in the screw holes, and the protective cover is clamped and fixed between the two connecting parts by the fixing bolts; two installation grooves are arranged on the side of the transmission head, and the two installation grooves are respectively adapted to the two connecting parts of the transmission shaft.

In order to make the center line of the transmission head and the center line of the transmission shaft stably coincide with each other, further: connecting holes are respectively arranged between the two mounting grooves and the rear end face of the transmission head, the size of the connecting hole is consistent with the size of the connecting part of the transmission shaft, the position of the connecting hole corresponds to the position of the connecting part of the transmission shaft, and the two connecting parts of the transmission shaft are respectively inserted into the two connecting holes on the rear end face of the mounting groove.

In order to facilitate the connection and installation between the movable pin and the transmission head, further: the front end of the movable pin is threadedly connected to the rear end of the transmission head. For example, the rear end surface of the transmission head is provided with a threaded hole, and the front end of the movable pin is provided with an adapted external thread.

In order to improve the stability between the transmission shaft and the tail handle, and thus improve the stability of the entire push-telescopic handle, a further improvement is made: the tail handle includes a straight rod section at the front end and an expanded diameter section at the rear end, the inner tube cavity of the transmission shaft passes through the front and rear end surfaces of the transmission shaft, the outer diameter of the straight rod section is consistent with the inner diameter of the inner tube cavity, the straight rod section is inserted into the rear end of the inner tube cavity, and the transmission shaft and the tail handle are relatively fixed.

In order to improve the comfort of holding the tail handle, further: an anti-skid sleeve is passed through the outer side of the transmission shaft, the anti-skid sleeve is fixed to the tail handle or the transmission shaft, and the rear end of the driving member is fixedly connected to the anti-skid sleeve.

Specifically: the anti-skid sleeve is fixed to the outer side of the transmission shaft by adhesive, a connecting washer or a connecting gasket is arranged between the enlarged diameter section of the tail handle and the anti-skid sleeve, and the connecting washer and the connecting gasket are fixed to the outer side of the tail handle by adhesive.

The beneficial effects of the push-telescopic handle of the utility model are as follows: the mounting position of the front end surface of the movable pin is used to fix and install the instrument body such as a proliferation membrane separation knife. For example, the handle of the proliferation membrane separation knife is fixedly installed on the mounting position of the movable pin, and the proliferation membrane separation knife is located in the protective cover. By pressing the driving member, the movable pin and the mounting position at the center of its front end surface move forward relative to the tail handle, and the front end of the instrument body can be extended from the front end of the protective cover, which is convenient for various operations, and the spring is also compressed; the pressing of the driving member is released, and under the rebound action of the spring, the driving member is reset, the movable pin retracts, and the front end of the instrument body is synchronously retracted into the protective cover. Due to the isolation and protection of the protective cover, non-therapeutic trauma caused by the instrument body can be avoided. The push-telescopic handle is easy to operate, and the pressing operation can be performed from any position around the driving member. The transmission structure has no hysteresis, which is conducive to improving surgical efficiency and quality.

The utility model also provides a proliferation membrane separator, including a proliferation membrane separation knife and a push-telescopic handle, the proliferation membrane separation knife is any one of the proliferation membrane separation knives in the first subject mentioned above, the push-telescopic handle is any one of the push-telescopic handles in the second subject mentioned above, the proliferation membrane separation knife is located in a protective cover, and the end of the handle of the proliferation membrane separation knife is fixed to the mounting position of the movable pin.

The following provides a size that can well match the needs of fundus surgery. Specifically: the maximum extension stroke of the proliferative membrane separation knife relative to the tail handle is 7mm, the length of the protective cover is 36mm, and when the driving part is in the natural state, the tip of the proliferative membrane separation knife is located at the front end of the protective cover.

The beneficial effect of the utility model proliferation membrane separator is that the proliferation membrane separation knife can be controlled to extend and retract at the front end of the protection tube by pressing and releasing the driving member, and the proliferation membrane separation knife can be completely retracted into the protection tube, and the tip of the proliferation membrane separation knife can also be completely exposed outside the protection tube, avoiding the problem of the tip of the proliferation membrane separation knife being always exposed during the operation, which is easy to cause non-therapeutic injuries. The driving member can be pressed from any position around it, which is convenient for doctors to operate and can improve the efficiency and quality of the operation.

BRIEF DESCRIPTION OF THE DRAWINGS

1 to 3 are partial stereoscopic views of the proliferation membrane separation knife of the utility model at three different angles.

FIG. 4 is a schematic structural diagram of the push-telescopic handle of the utility model.

FIG. 5 is an exploded view of the embodiment shown in FIG. 4 .

6 is a cross-sectional view of the embodiment shown in FIG. 4 after the proliferation membrane separation knife is installed, taken on a cross-sectional plane passing through the center line thereof.

7 and 8 are three-dimensional views of the transmission head at different angles in the embodiment shown in FIG. 4 .

Figure numerals: proliferation membrane separation knife 1, knife handle 11, knife head 12, first surface 121, second surface 122, side surface 123, blade surface 124, transition section 13; protective cover 2, transmission head 3, through hole 31, mounting groove 32, connecting hole 33, fastening bolt 4, spring 5, movable pin 6, transmission shaft 7, connecting part 71, anti-slip sleeve 81, connecting gasket 82, tail handle 9, driving part 10.

DETAILED DESCRIPTION

The utility model will be further described below in conjunction with the accompanying drawings.

The first subject of the utility model is a proliferation membrane separation knife, which is used for cutting and peeling proliferation membranes. As shown in Figures 1 to 3, the proliferation membrane separation knife of the utility model includes a rod-shaped handle 11 and a blade head 12 connected to one end of the handle 11. The handle 11 is generally columnar. In order to facilitate the processing and installation of the handle 11 and avoid the appearance of sharp edges and corners to ensure safety, the handle 11 is generally cylindrical. The handle 11 can be directly connected to the blade head 12, or the handle 11 and the blade head 12 are connected through a transition section 13. Considering that the shape and size of the handle 11 in its cross section are different from the shape and size of the blade head 12 in its cross section, in order to avoid the appearance of sharp edges and corners between the handle 11 and the blade head 12, a transition section 13 can be set between the handle 11 and the blade head 12, and the two ends of the transition section 13 are smoothly connected to the handle 11 and the blade head 12 respectively. The proliferation membrane separation knife 1 is a slender piece. In order to ensure the strength of the proliferation membrane separation knife 1 and facilitate processing and disinfection, the knife handle 11, the transition section 13 and the knife head 12 are preferably an integral metal piece. For example, the knife handle 11, the transition section 13 and the knife head 12 are an integral piece and made of stainless steel, generally 304 stainless steel.

The blade head 12 is in the shape of a strip. For the convenience of description, the two plate surfaces of the blade head 12 are defined as a first surface 121 and a second surface 122, respectively. The surface between the first surface 121 and the second surface 122 is a side surface 123, and the side surface 123 is U-shaped. The blade tip of the blade head 12 is in an arc shape to prevent the blade tip from causing trauma to other parts during use. If the blade tip is a sharp shape such as a rhombus or a cone, the blade tip is likely to cause trauma to other parts during use. The blade head 12 is not in the shape of a straight strip, but is bent to facilitate surgical operations. The blade head 12 is bent toward the first surface 121 to form an obtuse dihedral angle, the edges of the dihedral angle are located on the two plate surfaces and the direction of the edges is perpendicular to the length direction of the handle 11. The center line of a section of the blade head 12 away from the blade tip coincides with the center line of the handle 11, or the center line of a section of the blade head 12 away from the blade tip coincides with the center line of the handle 11 and the center line of the transition section 13. In order to facilitate the operation, the dihedral angle formed by the bending of the blade head 12 is 155° to 170°. For example, the dihedral angle is 165°, that is, the blade tip is bent by 15° from a straight shape.

The blade head 12 of the proliferation membrane separation knife 1 is only provided with a blade on one side, and the blade surface 124 is located at the junction of the first surface 121 and the side surface 123 and is U-shaped as a whole. The blade surface 124 is obtained by sharpening. In order to make the sharpness of the blade head 12 moderate, the dihedral angle between the first surface 121 and the blade surface 124 is 120° to 150°. For example, the dihedral angle between the first surface 121 and the blade surface 124 is 135°, that is, the blade head 12 can be sharpened at 45° on one side. The area of the first surface 121 is reduced due to sharpening, and the area of the second surface 122 is not reduced due to sharpening. The second surface 122 of the blade head 12 is a rough surface obtained by sandblasting. Sandblasting can increase the friction of the second surface 122, which is convenient for peeling off the proliferation membrane.

The following is a recommended size of the cutter head 12, where the length of the cutter head 12 is 2.0 mm, the width is 0.3 mm, and the thickness is 0.1 mm, wherein the width is the size of the cutter head 12 in a direction perpendicular to the length direction of the handle 11, and the thickness is the distance between the first surface 121 and the second surface 122.

The second subject of the present invention is a push-telescopic handle, which is used to install the instrument body of ophthalmic surgery, such as installing the above-mentioned proliferative membrane separation knife 1. Referring to Figures 4 to 6, the push-telescopic handle of the present invention includes a transmission head 3, a transmission shaft 7, a tail handle 9 and a driving member 10. For the convenience of description, the end of the push-telescopic handle to install the instrument body is defined as the front, that is, the left side of Figures 4 to 6 is the front and the right side is the back.

A through hole 31 is provided between the front and rear ends of the transmission head 3, and the through hole 31 is used for the protective cover 2 to pass through. At least one mounting groove 32 is provided on the side 123 of the transmission head 3, and the mounting groove 32 is communicated with the through hole 31 and the rear end face. The mounting groove 32 can extend directly to the rear end face of the transmission head 3, or a connecting hole 33 is provided on the rear end face of the transmission head 3, and the connecting hole 33 is communicated with the mounting groove 32. For example, in the embodiments shown in FIGS. 7 and 8, two mounting grooves 32 are provided on the side 123 of the transmission head 3, and two connecting holes 33 are provided on the rear end face of the transmission head 3, and the two connecting holes 33 are communicated with the two mounting grooves 32 respectively.

A connecting portion 71 is provided at the front end of the transmission shaft 7. The connecting portion 71 is inserted into the mounting groove 32 of the transmission head 3 from the rear end surface of the transmission head 3. The connecting portion 71 is used to fix the rear end of the protective cover 2. The instrument body of the ophthalmic surgery is provided in the protective cover 2. The protective cover 2 is used to isolate the instrument body to prevent the instrument body from causing non-therapeutic trauma. The protective cover 2 is tubular, and the rear end of the protective cover 2 is fixed to the connecting portion 71. The middle section of the protective cover 2 is located in the through hole 31 of the transmission head 3, and the front end of the protective cover 2 passes through the front end of the through hole 31. In order to more stably install the protective cover 2 on the connecting portion 71 of the transmission shaft 7, two connecting portions 71 are provided at the front end of the transmission shaft 7. The two connecting portions 71 are symmetrically arranged on both sides of the center line of the transmission shaft 7. The two connecting portions 71 are provided with at least one group of screw holes, and one group of screw holes is composed of two screw holes. The center lines of the two screw holes coincide and are located at the two connecting portions 71. A fixing bolt 4 is provided in the screw hole, and the protective cover 2 is clamped and fixed between the two connecting portions 71 by the fixing bolt 4. Correspondingly, two mounting grooves 32 are provided on the side surface 123 of the transmission head 3, and the two mounting grooves 32 are respectively adapted to the two connecting parts 71 of the transmission shaft 7. In order to keep the center line of the transmission head 3 and the center line of the transmission shaft 7 stably coincident, a connecting hole 33 is respectively provided between the two mounting grooves 32 and the rear end face of the transmission head 3, and the size of the connecting hole 33 is consistent with the size of the connecting part 71 of the transmission shaft 7, and the position of the connecting hole 33 corresponds to the position of the connecting part 71 of the transmission shaft 7. The two connecting parts 71 of the transmission shaft 7 are respectively inserted into the two connecting holes 33 of the rear end face of the mounting groove 32. At this time, the transmission head 3 performs telescopic movement relative to the transmission shaft 7, and the center line of the transmission head 3 always coincides with the center line of the transmission shaft 7. A cylindrical inner tube cavity is provided at the center of the front end face of the transmission shaft 7, and the center line of the inner tube cavity coincides with the center line of the transmission shaft 7. The inner tube cavity of the transmission shaft 7 may or may not penetrate the front and rear end faces of the transmission shaft 7. In order to facilitate disinfection and avoid dirt and grime in the inner tube cavity, the inner tube cavity preferably penetrates the front and rear end faces of the transmission shaft 7, and the transmission shaft 7 is tubular at this time. A movable pin 6 is placed in the inner tube cavity, and the movable pin 6 can slide along the center line of the inner tube cavity in the inner tube cavity, that is, the moving direction of the movable pin 6 in the inner tube cavity is consistent with the direction of the center line of the inner tube cavity.

The front end of the movable pin 6 is fixedly connected to the rear end of the transmission head 3. In order to facilitate the connection and installation between the movable pin 6 and the transmission head 3, the front end of the movable pin 6 is threadedly connected to the rear end of the transmission head 3. For example, a threaded hole is set on the rear end face of the transmission head 3, the center line of the threaded hole coincides with the center line of the through hole 31, and the front end of the movable pin 6 is provided with an adaptive external thread. A mounting position is set at the center of the front end face of the movable pin 6, and the mounting position is a position or structure for fixing and installing the instrument body of ophthalmic surgery. Since it is necessary to ensure that the instrument body passes through the protective cover 2, the center line of the protective cover 2 passes through the mounting position. An expanded diameter end is set at the rear end of the movable pin 6, and a spring 5 is passed through the outer side of the movable pin 6. The expanded diameter end limits the rear end of the spring 5, and the front end of the spring 5 is tightly matched with the boss in the inner tube cavity of the transmission shaft 7, and the rear end of the spring 5 is tightly matched with the expanded diameter end of the movable pin 6.

The rear end of the transmission shaft 7 is fixedly connected to the tail handle 9, which extends the total length of the push-telescopic handle and improves the comfort of holding. A driving member 10 is provided on the outside of the transmission shaft 7. The driving member 10 is a tubular structure that is pressed circumferentially to telescopically move axially. The driving member 10 is pressed at any position in the circumference, and the two ends of the driving member 10 are relatively far apart. The front end of the driving member 10 is fixedly connected to the transmission head 3, and the rear end of the driving member 10 is fixedly connected to the tail handle 9 or the transmission shaft 7. For example, the front and rear ends of the driving member 10 are fixedly connected by interference fit.

The movement process of pressing the telescopic handle is described below. Pressing the driving member 10, the transmission head 3 and the movable pin 6 move forward, and the spring 5 is also compressed. Since the instrument body of the ophthalmic surgery is fixedly installed at the installation position of the front end surface of the movable pin 6, the instrument body moves forward synchronously. The rear end of the protective cover 2 is fixedly connected to the connecting portion 71 of the front end of the transmission shaft 7. The protective cover 2, the transmission shaft 7 and the tail handle 9 are relatively stationary. The front end of the instrument body can be extended from the front end of the protective cover 2, which is convenient for various operations. Release the pressure on the driving member 10. Under the rebound action of the driving member 10 itself and the rebound action of the spring 5, the driving member 10 is reset, and the movable pin 6 retracts and pulls the front end of the instrument body to retract synchronously into the protective cover 2. The protective cover 2 plays an isolating and protective role on the instrument body, which can prevent the instrument body from causing non-therapeutic trauma.

In order to improve the stability between the transmission shaft 7 and the tail handle 9, and thus improve the stability of the entire push-telescopic handle, the tail handle 9 includes a straight rod section at the front end and an enlarged diameter section at the rear end, the inner tube cavity of the transmission shaft 7 passes through the front and rear end surfaces of the transmission shaft 7, the outer diameter of the straight rod section is consistent with the inner diameter of the inner tube cavity, the straight rod section is inserted into the rear end of the inner tube cavity, and the transmission shaft 7 and the tail handle 9 are relatively fixed. For example, the inner tube cavity of the transmission shaft 7 and the straight rod section of the tail handle 9 are fixed by adhesive, or the transmission shaft 7 and the tail handle 9 are connected by screws. In order to facilitate the cleaning of the tail handle 9, the tail handle 9 is preferably a hollow structure for easy cleaning and disinfection. In order to improve the comfort of holding the tail handle 9, an anti-slip sleeve 81 is inserted into the outer side of the transmission shaft 7, and the anti-slip sleeve 81 is fixed to the tail handle 9 or the transmission shaft 7, for example, the anti-slip sleeve 81 is fixed to the outer side of the transmission shaft 7 by an adhesive. The rear end of the driving member 10 can be fixedly connected to the anti-slip sleeve 81, for example, the front and rear ends of the driving member 10 are respectively fixedly connected to the transmission head 3 and the anti-slip sleeve 81 by interference fit. In order to improve the appearance quality, avoid a wide seam between the transmission shaft 7 and the tail handle 9, and make the push-telescopic handle more ergonomic, a connecting washer or a connecting gasket 82 is provided between the enlarged diameter section of the tail handle 9 and the anti-slip sleeve 81, and the connecting washer and the connecting gasket 82 are fixed to the outer side of the tail handle 9 by adhesive.

The third subject of the utility model is a proliferation membrane separator. As shown in FIG6 , the proliferation membrane separator includes a proliferation membrane separation knife 1 and a push-telescopic handle. The proliferation membrane separation knife 1 is the first subject mentioned above, and the push-telescopic handle is the second subject mentioned above. The proliferation membrane separation knife 1 is located in the protective cover 2, and the end of the handle 11 of the proliferation membrane separation knife 1 is fixed to the installation position of the movable pin 6, for example, the end of the handle 11 is fixed to the installation position by adhesive.

The following provides a size of a proliferative membrane separator that can well match the needs of fundus surgery. The maximum extension stroke of the proliferative membrane separator 1 relative to the tail handle 9 is 7 mm, the length of the protective cover 2 is 36 mm, and when the driving member 10 is in a natural state, that is, when it is not pressed, the tip of the proliferative membrane separator 1 is located at the front end of the protective cover 2.

Claims (10)

1. A proliferation membrane separation knife, comprising a rod-shaped handle (11), and a knife head (12) connected to one end of the handle (11), characterized in that: the tip of the knife head (12) is in an arc shape, the knife head (12) is in a strip plate shape, the two plate surfaces of the knife head (12) are respectively a first surface (121) and a second surface (122), the surface between the first surface (121) and the second surface (122) is a side surface (123), the knife head (12) is bent toward the first surface (121) to form an obtuse dihedral angle, the edges of the dihedral angle are located on the two plate surfaces and the direction of the edges is perpendicular to the length direction of the handle (11), a blade is arranged on one side of the knife head (12), the blade surface (124) of the blade is located at the junction of the first surface (121) and the side surface (123) and is U-shaped as a whole, and the second surface (122) is a rough surface obtained by sandblasting. 2. The proliferation membrane separation knife according to claim 1, characterized in that the dihedral angle formed by the bending of the knife head (12) is 155° to 170°. 3. The proliferation membrane separation knife as claimed in claim 2, characterized in that the dihedral angle is 165°. 4. The proliferation membrane separation knife according to claim 1, characterized in that the dihedral angle between the first surface (121) and the blade surface (124) is 120° to 150°. 5. The proliferation membrane separation knife according to claim 4, characterized in that the dihedral angle between the first surface (121) and the blade surface (124) is 135°. 6. The proliferation membrane separation knife according to any one of claims 1 to 5, characterized in that the knife handle (11) is cylindrical. 7. The proliferation membrane separation knife as described in claim 6 is characterized in that a transition section (13) is provided between the knife handle (11) and the knife head (12), and the two ends of the transition section (13) are smoothly connected to the knife handle (11) and the knife head (12) respectively. 8. The proliferative membrane separation knife as claimed in claim 7, characterized in that the knife handle (11), the transition section (13) and the knife head (12) are an integral whole and are made of stainless steel. 9 . The proliferation membrane separation knife as claimed in claim 8 , wherein the proliferation membrane separation knife is made of 304 stainless steel. 10. The proliferation membrane separation knife according to any one of claims 1 to 5, characterized in that the knife head (12) has a length of 2.0 mm, a width of 0.3 mm, and a thickness of 0.1 mm.