Iris suture needle

Abstract

The utility model discloses an iris suture needle, relates to the field of medical instruments, and aims to better adapt to the circular contour of pupils so as to reduce the risk of abnormal shapes of the pupils after suture. The needle body of the iris suture needle is provided with the arc-shaped puncture part with the radian larger than 3 / 2 pi, the shape of the puncture part can be better matched with a pupil with a circular outline, and the needle body is made of memory alloy, so that when the needle body is installed on a suture instrument with a suture needle pushing function for use, the needle body is pushed out in the process of switching from a constraint state to a release state, and the suture needle can be conveniently pushed out. According to the iris suture needle, the needle tip can pierce into iris tissue or iris and eyeball tissue around the iris, and then the puncture part can be sutured in the iris tissue or the iris and eyeball tissue around the iris along an arc-shaped path, so that the iris suture needle can better adapt to the circular outline of a pupil, and the iris can be sutured to enable the pupil to be contracted to obtain a relatively circular pupil shape; and the risk of special-shaped pupil after suture is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of medical devices, and particularly relates to an iris suture needle. Background Art

[0002] In the natural state, pupil dilation is common in trauma, sequelae of acute glaucoma attacks, etc. Patients will have obvious symptoms such as photophobia and vision decline, seriously affecting the quality of life of patients. Therefore, patients with pupil dilation have a strong desire for treatment and hope to improve their vision and relieve the symptoms of photophobia. At present, the main treatment method is to use suture to narrow the pupil.

[0003] Iris suture is one of the conventional ophthalmic surgeries in clinical practice. Currently, an intraocular lens positioning hook is often used to lift the iris tissue to be sutured, and then a suture needle with a suture is passed through the iris tissue or the iris and its surrounding ocular tissues to suture the iris and contract the pupil.

[0004] Since the existing iris suture needles are usually straight needles, and the iris and the eyeball have a curvature, and the contour of the pupil is approximately circular, the straight needle needs to be inserted obliquely into the iris tissue before it can be effectively sutured, which is very inconvenient. Also, since the suture position is under the doctor's field of vision, when the straight needle is inserted obliquely for suturing, it is more difficult to determine the suture position; moreover, during the process of determining the suture position, when the needle tip at the front end of the straight needle adjusts its position in the limited operation space of the eyeball, it is easy to damage the iris and its surrounding ocular tissues. In addition, since the straight needle cannot fit well with the circular contour of the pupil, it requires a high level of suture experience and suture technique for the doctor, otherwise, problems such as abnormal pupil shape after suture are likely to occur, such as the pupil being in an irregular shape, angular, or drop-shaped, or even multiple pupils may appear. Content of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an iris suture needle, which can better adapt to the circular contour of the pupil and reduce the risk of abnormal pupil shape after suture.

[0006] The technical solution adopted by the utility model to solve its technical problems is: an iris suture needle, which is used to be installed on a suturing device with a suture needle pushing function, and includes a needle body with a needle tip, and a threading hole is opened on the needle tip;

[0007] The needle body also has a transition section and a needle rod section, and the needle tip, the transition section and the needle rod section are connected in sequence as a whole;

[0008] The needle tip includes a needle edge, the needle edge is in the shape of a triangular pyramid, the edges where its three side surfaces meet form a cutting edge, and the vertex where its three side surfaces meet together forms a needle tip;

[0009] The needle tip and the transition section together form the puncturing part of the needle body. The puncturing part is arc-shaped, with a radian of α, where 3 / 2π < α < 2π;

[0010] The needle body is made of shape memory alloy and has a constrained state and a released state; when in the constrained state, the needle body presents the shape restricted by the constraint conditions; during the process of switching from the constrained state to the released state, the needle body gradually disengages from the constraint from front to back along its central axis, and its puncturing part can be gradually released to its original shape along an arc path.

[0011] Further, when the needle body is in the released state, the central axis surrounded by the puncturing part is the first central axis;

[0012] The three sides of the needle tip are respectively the first side perpendicular to the first central axis, and the second side and the third side which are symmetrical to each other.

[0013] Further, the hole axis of the thread-passing hole is parallel to the first central axis.

[0014] Further, the thread-passing hole is a round hole, and the intersection with the needle tip surface is smoothly transitioned through an arc structure.

[0015] Further, the needle body is a suture needle body made of nickel-titanium shape memory alloy.

[0016] Further, the iris suture needle further includes a guide tube with a constraint channel;

[0017] The constraint channel includes a channel main body section and an arc-shaped channel section connected to the front end of the channel main body section;

[0018] The length of the arc-shaped channel section is 1 / 9 - 1 / 6 of the length of the puncturing part, and the arc-shaped channel section is configured to guide the puncturing part and strengthen the stiffness of the released part of the puncturing part;

[0019] The needle body is embedded in the constraint channel, and at least part of its puncturing part is in the arc-shaped channel section.

[0020] Further, the guide tube includes a straight tube section and an arc tube section connected to the front end of the straight tube section;

[0021] The channel main body section is the inner cavity of the straight tube section;

[0022] The arc-shaped channel section is the inner cavity of the arc tube section.

[0023] The beneficial effects of the present utility model are as follows: The needle body of the iris suture needle has a circular arc-shaped puncture part with a radian greater than 3 / 2π. The shape of its puncture part can better fit the circular pupil contour. Also, since the needle body is made of shape memory alloy, when it is used on a suturing device with a function of pushing the suture needle, during the process of being pushed out and switching from the constrained state to the released state, the needle tip can pierce into the iris tissue or the eyeball tissue around the iris and the iris. Furthermore, its puncture part can perform suturing along a circular arc path within the iris tissue or the eyeball tissue around the iris and the iris, which can better adapt to the circular contour of the pupil, facilitating suturing the iris so that the pupil can obtain a relatively round shape after contraction and reducing the risk of abnormal pupil shape after suturing. Moreover, during the process of gradually releasing the circular arc-shaped puncture part, it can be inserted into the iris tissue more naturally without significant tilting. On the one hand, it is beneficial for the doctor to determine the suturing position and improve the suturing accuracy. On the other hand, it can reduce the damage to the eyeball tissue. In addition, the triangular pyramid-shaped needle edge is sharp, with less friction with the eyeball tissue, which can reduce the puncture resistance and further reduce the trauma to the eyeball tissue.

[0024] The technical effects brought about or directly produced by other technical features of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0026] Figure 2 is Figure 1 a partial enlarged view of the P position in

[0027] Figure 3 is Figure 1 the top view of the embodiment;

[0028] Figure 4 is Figure 1 the bottom view of the embodiment;

[0029] Figure 5 is the top view of another embodiment of the present utility model in the constrained state;

[0030] Figure 6 is Figure 5 the top view of the embodiment switching to the released state;

[0031] Figure 7 is the usage state of the present utility model installed on the suturing device Figure 1 ;

[0032] Figure 8 is the usage state of the present utility model installed on the suturing device Figure 2 ;

[0033] Figure 9 It is a demonstration diagram of the puncture process of using the present utility model to suture the iris;

[0034] The markings in the figure are: 100 - needle body, 110 - needle tip, 111 - thread - passing hole, 112 - cutting edge, 113 - first side, 114 - second side, 115 - third side, 116 - needle point, 120 - transition section, 130 - needle shank section, 200 - guide tube, 210 - straight tube section, 220 - arc - shaped tube section, 300 - suture device, 400 - pupil, 500 - suture thread. Specific embodiments

[0035] The present utility model will be further described below with reference to the accompanying drawings. The same reference numerals in the drawings denote components with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.

[0036] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counter - clockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position and dimensional relationship based on the orientation or position relationship shown in the drawings. These are only for convenience of description and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0037] In the description of the present utility model, the terms "connect", "combine", "couple", "mount" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. For example: direct connection means that two parts or components are connected together without setting an intermediate member, and indirect connection means that two parts or components are respectively connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. Among them, "connect" and "couple" are not limited to physical or mechanical connection or coupling, and can also include electrical connection or coupling. When the term "plurality" represents a quantity, it usually means a quantity of three or more. For example: "a plurality" usually means three or more. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0038] Combined with Figures 1 to 4 As shown, the iris suture needle is used to be mounted on a suture device 300 with a suture - needle pushing function, and includes a needle body 100 having a needle tip 110, a transition section 120, and a needle shank section 130. The needle tip 110, the transition section 120, and the needle shank section 130 are connected in sequence as a whole;

[0039] The needle 110 is mainly used for puncturing the iris tissue or the eye tissue around the iris and its periphery; a threading hole 111 is formed on the needle 110 for threading a suture 500; the needle 110 includes a needle blade, the needle blade is in the shape of a triangular pyramid, and the edges where the three side surfaces meet each other form a cutting edge 112, and the vertex where the three side surfaces meet together forms a needle tip 116; the needle blade in the shape of a triangular pyramid is sharp, with less friction with the eye tissue, which can reduce the puncture resistance, so as to smoothly and accurately puncture into the iris tissue or the eye tissue around the iris and its periphery, ensure the accurate position of the suture 500, and reduce the trauma to the eye tissue;

[0040] The transition section 120 is mainly used for connecting the needle 110 and the needle rod section 130 in a transitional manner, and together with the needle 110 forms the puncture part of the needle body 100;

[0041] The needle rod section 130 is mainly used for carrying and driving the puncture part, and is used for mating connection with the pushing part of the suture device 300;

[0042] The puncture part is mainly used for piercing the iris tissue or the eye tissue around the iris and its periphery to carry the suture 500 for suturing; the puncture part is in an arc shape, and its radian is α, 3 / 2π < α < 2π; the puncture part is a circular arc structure with a radian greater than 3 / 4 of a circle, which can better fit the pupil 400 with a circular contour, more accurately guide the suture 500 for suturing, is beneficial to suturing the iris to make the pupil 400 contract to obtain a more circular pupil shape, and effectively reduces the damage to the eye tissue during the puncture process;

[0043] The needle body 100 is made of shape memory alloy, which has a constrained state and a released state; the shape memory alloy has a much greater deformation recovery ability than ordinary metals. It will produce an adaptive deformation under constrained conditions and can directly or indirectly return to its original state after losing the constraint; indirectly returning to its original state means that the shape memory alloy returns to its original state under the assistance of external actions (such as thermal load, guiding channel, etc.); there can be various shape memory alloys, preferably nickel-titanium shape memory alloy. The nickel-titanium shape memory alloy has good shape memory characteristics, superelasticity, corrosion resistance, and temperature sensitivity, and is particularly suitable for making the main body of the suture needle; considering that the normal body temperature of the human body is 36.3 - 37.2 °C, the needle body 100 is further preferably a suture needle body made of nickel-titanium shape memory alloy with a memory temperature of 36.5 - 37 °C. When the puncture part of the needle body 100 pierces into the iris tissue or the eye tissue around the iris and its periphery, it will be affected by the thermal load generated by the patient's body temperature, and then the needle body 100 gradually heats up to the memory temperature, thus automatically returning to an arc shape without applying an additional thermal load, which is very convenient to use;

[0044] When in the constrained state, the needle body 100 presents a shape restricted by the constraint conditions; during the process of switching from the constrained state to the released state, the needle body 100 is gradually disengaged from the constraint along its center line from front to back, and its puncture part can be gradually released to its original state along an arc path, that is, the puncture part can move along an arc trajectory and gradually return to a circular arc shape during this process, as Figure 9 shown; in this way, it can better fit the circular contour of the pupil 400, and a more stable and safer puncture operation can be achieved.

[0045] This iris suture needle is usually installed on a stapler 300 with a suture needle pushing function for use, as Figure 7 and Figure 8 shown; during the process of being pushed out and switching from the constrained state to the released state, the needle tip 116 can penetrate the iris tissue or the eye tissue of the iris and its periphery, and then its puncture part can perform iris suture along a circular arc path within the iris tissue or the eye tissue of the iris and its periphery, which can better adapt to the circular contour of the pupil 400, so as to facilitate suturing the iris to make the pupil 400 contract to obtain a more circular pupil shape and reduce the risk of pupil deformation after suturing. Moreover, during the process of gradually releasing the circular arc puncture part of this iris suture needle, it can be inserted into the iris tissue more naturally, without tilting significantly, and basically does not need to adjust the position of the needle 110 within the eye with limited operating space. On the one hand, it is conducive to the doctor to determine the suture position and improve the suture accuracy, and on the other hand, it can reduce the damage to the eye tissue.

[0046] Combined with Figures 1 to 9 shown, the specific process of suturing with this iris suture needle is as follows: push the needle body 100 forward a certain distance through the stapler 300 to make the needle tip 116 penetrate the iris → lift the iris with an intraocular lens positioning hook → continue to push the needle body 100 forward a certain distance through the stapler 300 to make the puncture part carry the suture 500 pass under the iris → lower the iris → then push the needle body 100 forward a certain distance to make the puncture part carry the suture 500 pass above the iris → perform cyclic operation to make the suture 500 shuttle above and below the iris tissue or the eye tissue of the iris and its periphery → pull the suture 500 to form an arc suture path around the pupil 400 on the iris tissue or the eye tissue of the iris and its periphery → tighten the suture 500 to reduce the diameter of the pupil 400 and obtain a more circular pupil shape → iris suture is completed.

[0047] In some embodiments of the present invention, the arc radius of the puncture part is usually 5 - 8 mm, so as to facilitate suturing the iris to effectively contract the pupil 400.

[0048] Combined with Figure 2 and Figure 4As shown, in some embodiments of the present utility model, when the needle body 100 is in the released state, the central line surrounded by the puncturing portion is the first central line; the three sides of the needle tip 110 are respectively a first side surface 113 perpendicular to the first central line, and a second side surface 114 and a third side surface 115 which are symmetrical to each other. The needle tip 100 of this structure has a symmetrical shape, and its first side surface 113 is perpendicular to the first central line, which is beneficial to cutting into the eyeball tissue during use. The symmetrical second side surface 114 and third side surface 115 form a wedge-shaped structure that gradually bulges backward from the needle tip 116, which is beneficial to pushing aside the eyeball tissue during the puncture process, thereby making the puncture smoother and further reducing the trauma to the eyeball tissue.

[0049] In some embodiments of the present utility model, the hole axis of the thread-passing hole 111 is parallel to the first central line, so as to further facilitate threading the suture 500 and carrying the suture 500 for suturing, and improve the suturing effect.

[0050] Again, Figure 2 As shown, in some embodiments of the present utility model, the thread-passing hole 111 is a round hole, and the intersection of it and the surface of the needle tip 110 has a smooth transition through an arc structure. In this way, the intersection of the thread-passing hole 111 and the surface of the needle tip 110 can be smooth, and the friction with the iris tissue or the eyeball tissue around the iris is small, which further facilitates puncture and reduces the trauma to the eyeball tissue; moreover, the arc structure can strengthen the strength of the needle tip 110 and improve its service life.

[0051] In some embodiments of the present utility model, the iris suture needle further includes a guide cylinder 200 having a constraint channel; the constraint channel includes a channel main body section and an arc-shaped channel section connected to the front end of the channel main body section; the length of the arc-shaped channel section is 1 / 9 to 1 / 6 of the length of the puncturing portion, and the arc-shaped channel section is configured to guide the puncturing portion and strengthen the stiffness of the released portion of the puncturing portion; the needle body 100 is embedded in the constraint channel, and at least part of its puncturing portion is in the arc-shaped channel section. On the one hand, the guide cylinder 200 can accurately guide the needle body 100 to ensure that the needle body 100 punctures into the iris tissue or the eyeball tissue around the iris along a predetermined path. On the other hand, the arc-shaped channel section guides the puncturing portion and promotes it to return to a circular arc shape, so as to further facilitate the puncturing portion to fit the circular contour of the pupil 400 for suturing, without significantly tilting the needle body 100 for insertion, and basically no need to adjust the position of the needle tip 110 in the limited operation space of the eyeball; in addition, limiting the length of the arc-shaped channel section to 1 / 9 to 1 / 6 of the length of the puncturing portion is beneficial to ensuring that the puncturing portion is effectively released and strengthening the stiffness of the released portion to a certain extent, so as to have enough released length to better adapt to the circular contour of the pupil 400, achieve the purpose of shrinking the pupil 400, and obtain a relatively round pupil shape.

[0052] Combined withFigure 5 and Figure 6 As shown in Figure 6 , in some embodiments of the present utility model, the guide cylinder 200 includes a straight cylinder section 210 and an arc cylinder section 220 connected to the front end of the straight cylinder section 210; the channel main body section is the inner cavity of the straight cylinder section 210; the arc channel section is the inner cavity of the arc cylinder section 220. The structure of the guide cylinder 200 is simple, and it is very convenient to manufacture, use and maintain. It is beneficial to be installed on the stapler 300 to accurately and effectively guide the needle body 100.

[0053] In some embodiments of the present utility model, the diameter of the needle body 100 is 0.2 - 0.4 mm, and the length is 50 - 60 mm. The needle body 100 with such dimensions can reduce the damage to the eyeball tissue while ensuring that it can carry the suture 500 to suture the iris tissue or the eyeball tissue around the iris and its periphery, and improve the suture quality.

[0054] The description of the various embodiments of the present utility model is presented herein only for the purpose of illustration and is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are chosen to best explain the principles of the embodiments, the practical application, or the technological advancement, or to enable other skilled artisans in the art to understand the embodiments disclosed herein, compared to the technologies found in the market.

[0055] In this document, the various embodiments of the present utility model can be presented in range form. It should be understood that the description in range form is only for convenience and brevity and should not be construed as a rigid limitation on the scope of the present utility model. Therefore, the description of a range should be considered to specifically disclose all possible sub - ranges and the individual values within that range. For example, the description of a range such as from 1 to 6 should be considered to specifically disclose sub - ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and the individual values within that range, such as 1, 2, 3, 4, 5, 6, regardless of the width of the range.

[0056] It should be understood that, for the sake of clarity, certain features of the present utility model described in the context of separate embodiments can also be provided in combination in a single embodiment. Conversely, for the sake of brevity, the various features of the present utility model described in the context of a single embodiment can also be provided separately or in any suitable sub - combination, or in any other described embodiment of the present utility model where appropriate. Certain features described in the context of various embodiments are not considered essential features of those embodiments unless the embodiments do not work without those features.

Claims

1. An iris suture needle for use when mounted on a stapler with a suture needle pushing function, comprising a needle body (100) having a needle tip (110), and a thread-passing hole (111) is formed in the needle tip (110); It is characterized in that: The needle body (100) further has a transition section (120) and a needle shank section (130), and the needle tip (110), the transition section (120) and the needle shank section (130) are connected in sequence as a whole; The needle tip (110) includes a needle edge, the needle edge is in the shape of a triangular pyramid, and the edges where the three side surfaces meet form a cutting edge (112), and the vertex where the three side surfaces meet together forms a needle point (116); The needle tip (110) and the transition section (120) together form the puncturing part of the needle body (100), the puncturing part is in an arc shape, and its radian is α, 3 / 2π < α < 2π; The needle body (100) is made of shape memory alloy and has a constrained state and a released state; when in the constrained state, the needle body (100) presents a shape restricted by the constraint conditions; during the process of switching from the constrained state to the released state, the needle body (100) gradually disengages from the constraint from front to back along its center line, and its puncturing part can be gradually released to its original state along an arc path.

2. The iris suture needle according to claim 1, characterized in that: When the needle body (100) is in the released state, the center line surrounded by the puncturing part is the first center line; The three side surfaces of the needle tip are respectively a first side surface (113) perpendicular to the first center line, and a second side surface (114) and a third side surface (115) that are symmetric to each other.

3. The iris suture needle according to claim 2, wherein: The hole axis of the thread-passing hole (111) is parallel to the first center line.

4. The iris suture needle according to claim 3, characterized in that: The thread-passing hole (111) is a round hole, and the intersection of it and the surface of the needle tip (110) is smoothly transitioned through an arc structure.

5. The iris suture needle according to claim 1, wherein: The needle body (100) is a suture needle main body made of nickel-titanium shape memory alloy.

6. The iris suture needle according to any one of claims 1 to 5, characterized in that: It further includes a guide cylinder (200) having a constraint channel; The constraint channel includes a channel main body section and an arc-shaped channel section connected to the front end of the channel main body section; The length of the arc-shaped channel section is 1 / 9 to 1 / 6 of the length of the puncturing part, and the arc-shaped channel section is configured to guide the puncturing part and enhance the stiffness of the released part of the puncturing part; The needle body (100) is embedded in the constraint channel, and at least part of its puncturing part is in the arc-shaped channel section.

7. The iris suture needle according to claim 6, wherein: The guide cylinder (200) includes a straight cylinder section (210) and an arc cylinder section (220) connected to the front end of the straight cylinder section (210); The channel main body section is the inner cavity of the straight cylinder section (210); The arc-shaped channel section is the inner cavity of the arc cylinder section (220).

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