A lacrimal drainage tube introducer and method of operation thereof

Abstract

The application discloses a lacrimal passage drainage tube placer, which comprises a catheter, a guide head, a guide wire and a lead wire. The catheter is a flexible rubber tube with open ends. The guide head is a cone arranged at the front end of the catheter and having a cone bottom facing the front end of the catheter, and the diameter of the cone bottom of the guide head is larger than the inner diameter of the catheter. The front end of the guide wire is slid through the catheter and connected with the cone bottom of the guide head, and the rear end of the guide wire is located outside the catheter. The front end of the lead wire is connected with the rear end of the guide wire, and the rear end of the lead wire is connected with the lacrimal passage drainage tube by a snap fastener. The lead wire and the lacrimal passage drainage tube can freely pass through the lacrimal passage along with the guide wire. The front end of the catheter can be bent under the action of external force, and the front end of the catheter can also be straightened along with the straightening of the guide wire inside the catheter. The application has the advantages of reasonable structure, convenient operation, realization of the built-in silicone tube in the lacrimal passage by means of the guide wire in the flexible rubber tube, promotion of the dredging and repair of the lacrimal passage, adaptability to and passing through various types of variable and curved lacrimal passages, good safety, high efficiency and success rate of tube placement and low cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of medical devices, and particularly relates to a lacrimal passage drainage tube placer and an operation method thereof. BACKGROUND

[0002] The lacrimal passage is composed of upper and lower puncta, upper and lower lacrimal canaliculi, common canaliculus, lacrimal sac and nasolacrimal duct. The upper and lower lacrimal canaliculi and the nasolacrimal duct are more prone to obstruction. The obstruction of the upper and lower lacrimal canaliculi is mainly caused by congenital stenosis of the duct and postnatal trauma. The obstruction of the nasolacrimal duct is the most common obstruction. The lower end of the nasolacrimal duct has a narrow segment, which is more likely to be variable, and thus is more prone to obstruction. As a flow channel for tears, the lacrimal passage is prone to inflammation when it is obstructed for a long time. Therefore, when the lacrimal passage is obstructed, it needs to be dredged immediately and a drainage tube needs to be placed in the lacrimal passage for support to achieve lacrimal passage dredging or repair.

[0003] At present, there are two commonly used devices for dredging the lacrimal passage and placing a drainage tube:

[0004] One is as shown in Figure 1The shown lacrimal passage drainage tube placement device is to respectively sleeve both ends of the lacrimal passage drainage tube on the tail end of a probe, the head end of each probe is oval "olive head", which is actually the enlarged olive head of the head of the probe, and forms a ring-shaped recess with the probe part sleeved with the silicone tube behind, which can hook the "neck". When in use, the probe with the lacrimal passage drainage tube passes through the upper and lower lacrimal canaliculi, the common canaliculus, the lacrimal sac, the nasolacrimal duct to reach the lower end of the nasolacrimal duct and the nasal cavity, but due to the narrowness and large curvature of the lower end of the nasolacrimal duct, the head end of the probe is difficult to pass through this place and enter the nasal cavity and slide out of the nostril, so at this time a hook needle with a hook at the end is needed to be inserted into the lower end of the nasolacrimal duct from the nostril, hook the head end of the probe, then pull out the hook needle from the nasal cavity, after that pull out the probe together with one end of the lacrimal passage drainage tube from the nostril, finally separate the lacrimal passage drainage tube from the probe, and the placement of the lacrimal passage drainage tube is completed. After long-term surgical use, it is found that the placement device has the following shortcomings: first, due to the small diameter of the lacrimal passage, the diameter of the oval blunt head of the head end of the probe and the head end of the hook needle is relatively small, when the hook needle is used to hook the head end of the probe, not only it is not easy to hook, but even if it is hooked, the head end of the hook needle is also easy to slip off from the head end of the probe, and the head end of the probe has to be hooked again and again, which is very troublesome; second, since the lacrimal passage drainage tube is sleeved on the tail end of the probe, when the lacrimal passage drainage tube encounters a variation site or a narrow site or a curved site in the lacrimal passage during the movement of the probe, it is easy to slide back relative to the probe, which leads to that the probe passes through the lacrimal passage completely, but the lacrimal passage drainage tube is still in the lacrimal passage before the blockage, or the lacrimal passage drainage tube cannot be completely placed in the lacrimal passage, resulting in surgical failure; finally, since the head end of the hook needle is hook-shaped, and the hook needle is not easy to hook the head end of the probe, the head end of the hook needle repeatedly moves at the connection between the nasal cavity and the nasolacrimal duct, which is easy to hook the mucosa of the nasal cavity and the nasolacrimal duct.

[0005] Another is the placement device as shown in Figure 2 The device is to sleeve both ends of the lacrimal passage drainage tube on the head end of a probe; when in use, the head end of the probe pushes the lacrimal passage drainage tube to pass through the upper and lower lacrimal canaliculi, the common canaliculus, the lacrimal sac, the nasolacrimal duct to reach the lower nasal meatus; after long-term surgical use, it is found that the placement device has the following shortcomings: the lacrimal passage drainage tube is usually a silicone tube, during the movement of the probe pushing the lacrimal passage drainage tube in the lacrimal passage, the head end of the probe will pierce the lacrimal passage drainage tube, and then the lacrimal passage drainage tube will move back relative to the probe after the probe moves forward, which is difficult to achieve the surgical purpose of completely placing the lacrimal passage drainage tube in the lacrimal passage.

[0006] Therefore, it is necessary to optimize the lacrimal passage drainage tube placement device to overcome the problems existing in the existing placement device. SUMMARY

[0007] To solve the above problems, the purpose of the present application is to provide a convenient operation, can adapt to and through all kinds of variability of the curved tear duct drainage tube into the operator and its operation method.

[0008] The purpose of the present application is achieved by the following technical solutions:

[0009] A kind of tear duct drainage tube into the operator, including catheter, guide head, wire and lead wire;The catheter is the flexible rubber tube of two ends opening;The guide head is the cone body that is set in the front end of catheter and the cone bottom is towards the front end of catheter, the cone bottom diameter of guide head is greater than the inner diameter of catheter;The front end of the wire is slid through the catheter and is connected with the cone bottom of guide head, the rear end of wire is located outside the catheter;The front end of the lead wire is connected with the rear end of wire, the rear end of lead wire is connected with tear duct drainage tube using live buckle, lead wire and tear duct drainage tube can pass through tear duct freely with wire;After the wire in the catheter is relaxed, the front end of wire can be bent under the action of external force;After the wire in the catheter is straightened, the front end of catheter is straightened with the straightening of the wire in it.

[0010] Further, the catheter is made of epidural anesthesia catheter, more accurately, the catheter is made of the same material as the epidural anesthesia catheter.

[0011] Further, the front end of the catheter and the front end of the guide head are both arc surfaces to avoid scratching the mucosa.

[0012] Further, to ensure that the catheter can be straightened quickly after the wire is straightened, improve the introduction efficiency of the catheter in the tear duct, the catheter and the wire are gap fitted, specifically, the outer diameter of the catheter is 0.9-1.0mm, the inner diameter of the catheter is 0.45-0.55mm, the diameter of the wire is 0.35-0.45mm, the difference between the inner diameter of the catheter and the diameter of the wire is 0.1mm.

[0013] Further, to assist the wire in pulling the tear duct drainage tube and improve the implantation efficiency of the tear duct drainage tube, the tear duct drainage tube into the operator further includes an auxiliary wire, one end of the auxiliary wire is wound around the tear duct drainage tube, and the other end is connected with the tear duct drainage tube using a live buckle at the rear end of the lead wire.

[0014] Further, to facilitate the connection of the rear end of the wire with the lead wire, the rear end of the wire is connected with a wire hole, the front end of the lead wire is connected to the wire hole, and the wire hole, the lead wire and the tear duct drainage tube can freely pass through the tear duct under the traction of the wire. To indicate the catheter introduction length, a scale line indicating the catheter introduction length is arranged on the catheter.

[0015] Further, to facilitate operation, facilitate pushing the catheter forward, a handle for holding the catheter is arranged at the rear end of the catheter, and the handle is sleeved outside the wire.

[0016] Further, the guide wire is a plastic wire, and a scale line indicating the length of the guide wire is arranged on the guide wire.

[0017] More preferably, the guide wire is a plastic wire or a flexible carbon wire with a diameter of 0.4 mm, which has good flexibility and bending characteristics.

[0018] An operation method for placing a lacrimal passage drainage tube into a curved channel by using the lacrimal passage drainage tube placer, comprising the following steps:

[0019] (1) Pinch the rear end of the catheter, and pull the guide wire backward until the guide head contacts the front end of the catheter, and the part of the guide wire in the catheter is straightened, and the catheter is straightened.

[0020] (2) Keep the straightened state of the catheter and the part of the guide wire in the catheter, and push the catheter to move from the entrance end of the curved channel to the exit end of the curved channel. During the movement of the guide head and the catheter in the curved channel, when the blocked part is encountered, the rear end of the catheter is pushed, and the guide head and the front end of the catheter can effectively pass through the blocked part of the curved channel and move forward. When the guide head and the catheter move to the curved part of the curved channel, the guide wire is loosened, and the catheter restores its flexibility. At this time, the catheter is pushed, and the catheter is bent and slides into the curved lacrimal passage when it contacts the inner wall of the lacrimal passage. After the catheter passes through the curved variation part, step (1) is repeated to make the guide head closely contact the front end of the catheter, so that the catheter is straightened, and the catheter is continuously pushed forward, so that the catheter quickly passes through the curved channel until the guide head enters the exit end of the curved channel.

[0021] (3) After the guide head exits the curved channel, the guide wire is loosened, and the catheter is stopped. The guide wire is continuously pushed into the catheter from the rear end of the catheter, so that the guide wire slides forward along the catheter, the conical guide head continuously moves forward, and the guide wire continuously enters the exit end of the curved channel from the front end of the catheter and continuously curls into a ball. Then, a hook needle is inserted into the exit end of the curved channel to hook out the curled guide wire.

[0022] (4) After the guide wire is hooked out, the front end of the guide wire is pulled, and the rear end of the catheter is pinched. The catheter is slowly pulled out backward, so that the catheter is completely pulled out of the curved channel, and then the catheter is continuously pulled backward, so that the catheter is completely separated from the guide wire. During this process, the guide wire remains stationary.

[0023] (5) The rear end of the guide wire is connected with the front end of the lead, the rear end of the lead is sleeved on the lacrimal passage drainage tube, and then the front end of the guide wire is pulled forward. The guide wire drives the lead and the lacrimal passage drainage tube to move along one end of the curved channel to the exit end of the curved channel, until the lacrimal passage drainage tube is placed in the curved channel.

[0024] (6) Then, the quick release buckle connected between the front end of the lacrimal passage drainage tube and the rear end of the lead is released, so that the lacrimal passage drainage tube is separated from the lead, and the placement of the lacrimal passage drainage tube is completed.

[0025] The curved channel is a channel with a curved part, and the curved channel can be a lacrimal passage of a human body, a lacrimal passage of a teaching model or a channel with a curved part in other objects.

[0026] The present application has reasonable structure, convenient operation, uses the flexible hose to set the wire to realize the dredging and repair of the lacrimal passage, can adapt to and pass through various types of curved lacrimal passages, has good safety, high efficiency and success rate of catheterization, and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present application will be further described in detail below with reference to the drawings.

[0028] Figure 1 It is a structural schematic view of an existing lacrimal passage drainage tube placement device;

[0029] Figure 2 It is a structural schematic view of another existing lacrimal passage drainage tube placement device;

[0030] Figure 3 It is a structural schematic view of the lacrimal passage wire placement device of the present application;

[0031] Shown in the figure: 1-lacrimal passage drainage tube, 2-probe, 3-crochet needle, 4-catheter, 5-guide head, 6-wire, 7-wire, 8-assistant line, 9-wire hole, 10-handle. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0033] It should be understood that the structure, proportion, size, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions of the implementation of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the specification are only for easy description and understanding, and are not used to limit the scope of the implementation of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0035] like Figure 3 As shown, this embodiment provides a lacrimal duct drainage tube inserter, including a catheter 4, a guide head 5, a wire 6, and a lead wire 7.

[0036] The catheter 4 is a flexible rubber tube with openings at both ends. The catheter 4 is made of the same material as an epidural anesthesia catheter, which is both flexible and resilient, and possesses a certain degree of rigidity when straightened, allowing it to pass smoothly through the lacrimal duct and bend at large angles at points of curvature without easily breaking. To indicate the insertion length of the catheter 4, graduations are provided on the outside of the catheter 4. The front end of the catheter 4 is curved to avoid scratching the mucosa. The front end of the catheter 4 can be bent at large angles under external force (compared to the guide needle 2 used in the prior art, the catheter 4 of this invention is easier to bend and adapt to varying lacrimal duct curvatures with different angles of curvature; the front end of the catheter 4 also straightens as the internal guide wire 6 is straightened). For ease of operation and pushing the catheter 4 forward, a handle 10 is fixed to the rear end of the catheter 4 for easy gripping; the handle 10 is sleeved on the outside of the guide wire 6. The outer diameter of the catheter 4 is 0.9 mm, and the inner diameter is 0.5 mm.

[0037] The guide head 5 is a cone-shaped object located at the front end of the catheter 4 with its conical base facing the front end of the catheter 4 (the guide head 5 contacts but is not connected to the front end of the catheter 4, allowing relative movement between them). The diameter of the conical base of the guide head 5 is larger than the inner diameter of the catheter 4, and the diameter of the conical base of the guide head 5 is smaller than or equal to the outer diameter of the catheter 4 (approximately 0.9 mm). The vertical distance from the cone apex to the cone base of the guide head 5 is smaller than the outer diameter of the catheter 4. The guide head 5 is made of a tough material (such as carbon fiber), and its head is curved to avoid scratching the mucosa. A cylinder is also integrally fixed to the conical base of the guide head 5. This cylinder thickens the conical base of the guide head 5 to prevent deformation of the disc-shaped conical base during the pushing process.

[0038] The front end of the guide wire 6 slides through the catheter 4 and is connected (integrally connected) with the cone bottom of the guide head 5, and the rear end of the guide wire 6 is located outside the catheter 4. In order to ensure that the guide wire 6 is straightened, the catheter 4 can be quickly straightened, thereby improving the introduction efficiency of the catheter 4 in the tear duct, the catheter 4 and the guide wire 6 are in clearance fit, when one hand holds the handle 10 at the rear end of the catheter 4, the other hand pulls the guide wire 6 backward until the guide head 5 (cone bottom) contacts the front end of the catheter 4, the part of the guide wire 6 located in the catheter 4 is straightened, and the catheter 4 (especially the front end of the catheter 4) is straightened. The catheter 4 has relatively increased hardness after being straightened, and the catheter 4 can quickly pass through the tear duct, when the guide wire 6 is relaxed (the guide wire 6 is not straightened), the catheter 4 restores its softness, and when it is subjected to external force, it is easy to bend. According to the characteristics, when the catheter 4 moves to the curved and varied position of the tear duct, the guide wire 6 is relaxed, the catheter 4 restores its softness, and the catheter 4 is pushed, the front end of the catheter 4 is easy to bend and enter the curved and varied channel. The guide wire 6 is a plastic wire, and a scale line indicating the length of the guide wire 6 is arranged on the guide wire 6. The guide wire 6 is made of fishing line with a diameter of 0.4 mm, and has good toughness and bending characteristics.

[0039] The front end of the guide wire 6 is connected with the rear end of the guide wire 6, and the rear end of the guide wire 7 is connected with the tear duct drainage tube 1 by a snap buckle. The guide wire 7 and the tear duct drainage tube 1 can pass through the tear duct freely along with the guide wire 6. The fineness of the guide wire 7 is lower than that of the guide wire 6, and the guide wire 7 is mainly used for pulling the tear duct drainage tube 1 into the tear duct. The guide wire 7 is also made of carbon wire with a diameter of 0.08 mm.

[0040] Initially, the guide wire 6 is sleeved in the catheter 4 (the tail end of the guide wire 6 is inserted from the front end of the catheter 4, and the guide head 5 is close to the front end of the catheter 4), and the rear end of the guide wire 6 is not connected with the front end of the guide wire 7. The rear end of the guide wire 7 is connected with the tear duct drainage tube 1 by a snap buckle.

[0041] When a part of the tear duct, such as the upper tear duct, needs to be dredged and repaired, the tear duct drainage tube is placed into the tear duct by using the tear duct drainage tube placer, and the tear duct drainage tube 1 is sequentially placed into the tear duct through the upper punctum, the upper tear duct, the general tear duct, the tear sac and the nasal tear duct. The specific operation process is performed according to the following steps in sequence:

[0042] (1) Hold the handle 10 at the rear end of the catheter 4, and pull the guide wire 6 backward at the same time until the guide head 5 contacts the front end of the catheter 4, so that the part of the guide wire 6 located in the catheter 4 is straightened, and the catheter 4 (especially the front end of the catheter 4) is straightened.

[0043] (2) Keep the straightened state of the catheter 4 and the partial wire 6 in the catheter 4 (the catheter 4 and the wire 6 are not straightened, the catheter 4 can also pass through the lacrimal passage, but the passing effect is relatively poor), and then the guide head 5 and the straightened catheter 4 pass through the upper lacrimal canaliculus, the common lacrimal duct, the lacrimal sac, the nasolacrimal duct and enter the nasal cavity from the upper punctum in sequence. During the process of passing through the upper lacrimal canaliculus, the common lacrimal duct, the lacrimal sac and the nasolacrimal duct in sequence, when encountering the blocked part, due to the increased hardness of the straightened catheter 4 and the tapered front guide head, the passing ability of the catheter 4 is increased (when passing through a narrow and high-viscosity channel, the straightened catheter 4 is obviously stronger than the unstraightened catheter 4 in passing ability, and it is the same reason as when the soft wire is threaded through the needle, the front end of the soft wire is straightened, and it is easier to thread the needle successfully), at this time, after slightly pushing the rear end of the catheter 4, the front end of the guide head 5 and the catheter 4 can effectively penetrate the blocked part of the lacrimal passage and move forward; when the guide head 5 and the catheter 4 move to the curved variation part (such as the lower end of the nasolacrimal duct), the wire 6 is relaxed, the catheter 4 restores its softness, at this time, the catheter 4 is pushed, and the catheter 4 is in contact with the inner wall of the lacrimal passage and is easily bent and slides into the curved lacrimal passage, when the catheter 4 passes through the curved variation part, the guide head is close to the front end of the catheter, the catheter 4 is straightened, the hardness of the straightened catheter 4 is relatively increased (the passing ability in the lacrimal passage is also increased), the catheter 4 is continuously pushed forward, and the catheter 4 can quickly pass through the lacrimal passage until the guide head 5 enters the nasal cavity.

[0044] (3) When the guide head 5 enters the nasal cavity (the space becomes larger), the wire 6 is relaxed (the wire 6 is not straightened any more), the pushing of the catheter 4 is stopped (the catheter 4 remains stationary), at this time, the wire 6 is continuously pushed into the catheter 4 from the rear end of the catheter 4, so that the wire 6 slides forward along the catheter 4, the tapered guide head 5 (under the pushing force of the wire 6 in the rear part) continuously moves forward, at the same time, the wire 6 continuously slides out of the nasal cavity through the inferior meatus or is curled and accumulated in the inferior meatus, if the guide head 5 is blocked in the nasal cavity and is difficult to slide out of the nostril, at this time, the needle hook 3 shown in the figure can be used to hook the curled and accumulated wire 6 in the nasal cavity, so that the wire 6 can be easily hooked out of the nasal cavity. Figure 1

[0045] (4) After the wire 6 is hooked out of the nasal cavity, the front end of the wire 6 is pulled (the wire 6 remains stationary), at the same time, the handle 10 at the rear end of the catheter 4 is pinched, and the catheter 4 is slowly pulled out backward, so that the catheter 4 is completely taken out of the lacrimal passage, then the catheter 4 is continuously pulled backward, so that the catheter 4 is completely separated from the wire 6, in this process, the wire 6 remains stationary temporarily, the rear end of the wire 6 is located outside the punctum, the front end of the wire 6 is stretched out of the outside of the nasal cavity, and the middle part is left in the lacrimal passage (from the punctum to the outside of the nasal cavity).

[0046] ​(5) Connect the rear end of the lead wire 6 to the front end of the lead wire 7. The rear end of the lead wire 7 is looped (slip-fitted) around the lacrimal drainage tube 1. Then pull the front end of the lead wire 6 (located on the side of the nasal cavity). The lead wire 6 drives the lead wire 7 and the lacrimal drainage tube 1 to move along the lacrimal duct from the lacrimal punctum side into the nasal cavity until the lacrimal drainage tube is placed in the lacrimal duct.

[0047] (6) After that, unfasten the snap fastener (anti-slip snap fastener) connecting the front end of the lacrimal drainage tube 1 to the rear end of the guide wire 7, so that the lacrimal drainage tube 1 is separated from the guide wire 7, thus completing the insertion of the lacrimal drainage tube 1.

[0048] When other parts of the lacrimal duct need to be cleared or repaired, the same steps are repeated. The only difference is that when clearing or repairing the lower lacrimal canaliculus, the lacrimal duct drainage tube inserter enters the common lacrimal duct, lacrimal sac, and nasolacrimal duct in sequence from the lower lacrimal punctum, lower lacrimal canaliculus, and then the common lacrimal duct.

[0049] and Figure 1 , Figure 2 Compared with the two implantation devices, this embodiment uses a flexible conduit 4 combined with a wire 6 to replace the traditional probe 2, which overcomes the defects of the probe 2 in encountering the variable curved lacrimal duct, which makes it difficult to pass through, affects the efficiency of the operation, and may even damage the lacrimal duct mucosa. At the same time, the material cost of the implantation device shown in this embodiment is also significantly lower than the two, and the operation is simpler and more effective. Example 2

[0050] The difference between this embodiment and Embodiment 1 is that:

[0051] In order to assist the guide wire 7 in pulling the lacrimal drainage tube 1 and improve the implantation efficiency of the lacrimal drainage tube 1, this embodiment also provides an auxiliary wire 8 based on the structure described in embodiment one. One end of the auxiliary wire 8 is wrapped around the lacrimal drainage tube 1, and the other end is connected to the rear end of the guide wire 7 together with the lacrimal drainage tube 1 using a snap fastener. Example 3

[0052] The difference between this embodiment and Embodiment 1 or Embodiment 2 is that:

[0053] To facilitate the connection between the rear end of the lead wire 6 and the lead wire 7, this embodiment, based on the structure described in Embodiment 1, also includes a lead wire hole 9. The lead wire hole 9 is located at the rear end of the lead wire 6, and the front end of the lead wire 7 is connected to the lead wire hole 9. The lead wire hole 9, the lead wire 7, and the lacrimal duct drainage tube 1 can freely pass through the lacrimal duct under the traction of the lead wire 6. The lead wire hole 9 has a diameter of 0.2 mm, allowing a 0.08 mm lead wire to easily pass through it.

[0054] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.

[0055] It is to be understood that the terminology "including", "comprising", or any other variation thereof, is intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a list of elements are not to be construed to solely include only those elements but can include other elements not expressly listed or inherent to such processes, methods, articles, or apparatuses.

[0056] The scope of protection of the application is not limited to the technical solutions of the specific embodiments disclosed, and any modification, equivalent replacement, improvement, etc. made according to the technical essence of the application to the above embodiments shall fall within the scope of protection of the application.

Claims

1. A lacrimal duct drainage tube inserter, characterized in that... The utility model provides a kind of tear duct catheter, including catheter, guide head, guide wire and lead wire;The catheter is the tough rubber tube of two ends opening;The guide head is the cone that is set in catheter front end and conical bottom is towards catheter front end, and the conical bottom diameter of guide head is greater than catheter inner diameter;The front end of guide wire is slid through catheter and is connected with the conical bottom of guide head, and the rear end of guide wire is located outside catheter;The front end of lead wire is connected with the rear end of guide wire, and the rear end of lead wire is connected with tear duct drainage tube using live buckle, and lead wire and tear duct drainage tube can pass through tear duct freely with guide wire;After the relaxation of guide wire inside catheter, the front end of guide wire can be bent under external force;After the straightening of guide wire inside catheter, the front end of catheter is straightened with the straightening of guide wire inside it;The material used in catheter is consistent with the material used in epidural anesthesia catheter.

2. The punctum plug inserter of claim 1, wherein The front end of catheter and the front end of guide head are both arc surface.

3. The punctum plug inserter of claim 1, wherein The length of catheter is 7.0-8.0cm, the outer diameter of catheter is 0.9-1.0mm, the inner diameter of catheter is 0.45-0.55mm, the diameter of guide wire is 0.35-0.45mm, and the difference between the inner diameter of catheter and the diameter of guide wire is 0.1mm;The length of guide wire is 45-55cm, and the diameter of lead wire is 0.08mm.

4. The punctum plug inserter of claim 1, wherein It also includes auxiliary line, one end of auxiliary line is wound on tear duct drainage tube, and the other end is connected with tear duct drainage tube using live buckle on the rear end of lead wire.

5. The punctum plug inserter of claim 1, wherein The rear end of guide wire is connected with guide wire hole, and the diameter of guide wire hole is 0.2mm, the front end of lead wire is connected on the guide wire hole, and the guide wire hole, lead wire and tear duct drainage tube can pass through tear duct freely under the traction of guide wire.

6. The punctum plug inserter of claim 1, wherein Scale line indicating catheter introduction length is arranged outside catheter;Guide wire is plastic wire, and scale line indicating guide wire sending length is arranged on guide wire.

7. The punctum plug inserter of claim 1, wherein Handle is arranged on the rear end of catheter, which is sleeved outside guide wire to facilitate holding catheter.

8. The punctum plug inserter of claim 7, wherein The diameter of guide wire is 0.4mm, which is plastic wire or tough carbon wire.

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