Minimally invasive lacrimal punctum dilator

Abstract

The present invention discloses a minimally invasive lacrimal punctum dilator, comprising: a conical head end and an expansion cone; the expansion cone has a large head end and a small head end along its axis, the conical head end is arranged at the small head end of the expansion cone; the large head end of the expansion cone is connected to the inner cylindrical section of the lacrimal punctum cannula, and the inner cylindrical section of the lacrimal punctum cannula is connected to a gripping portion; and the lacrimal punctum cannula, which includes a lacrimal punctum cannula wall and a lacrimal punctum cannula adaptation surface; the lacrimal punctum cannula wall is sleeved and arranged on the inner cylindrical section of the lacrimal punctum cannula; the lacrimal punctum cannula wall has a lacrimal punctum cannula adaptation surface near the expansion cone end. Through the above-mentioned method, after the lacrimal punctum is expanded, the lacrimal punctum cannula is supported in place, has high stability, and is free of friction resistance caused by lacrimal punctum contraction. The lacrimal duct probe is easy to enter and exit without resistance, so that the resistance position is clear when the lacrimal duct is probed, and the blockage position is easy to determine. At the same time, the lacrimal punctum is expanded in one step as needed, without additional damage to the lacrimal punctum, and tissue damage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a minimally invasive lacrimal point dilator. Background Art

[0002] Current examinations and treatments for tear duct obstruction include tear duct irrigation and tear duct probing. However, tear duct probing generally requires lacrimal punctum dilation. Current lacrimal punctum dilators have a 3-4mm diameter cone tip. During lacrimal punctum dilation, doctors don't know when dilation is complete and can only rely on their experience. This often leads to two situations:

[0003] 1. Insufficient expansion. Repeated expansion is required. Repeated movements and friction during operation increase tissue damage.

[0004] 2. Excessive expansion leads to damage to the tear puncta or even tearing of the tear puncta, affecting the tear drainage function.

[0005] The size of the lacrimal punctum is 0.2 to 0.3 mm and can be expanded up to 5 times without damage; therefore, the current conical lacrimal punctum dilator with a diameter of 3-4 mm will inevitably increase the chance of lacrimal punctum damage; it is designed with a diameter of 3-4 mm instead of 1.0 to 1.5 mm because the lacrimal punctum is expanded without damage. After the dilator is removed, the lacrimal punctum is mostly restored (because the fibrous tissue ring around the lacrimal punctum contracts), so it is still impossible to enter the instrument for operations such as lacrimal duct probing.

[0006] Use a 3~4mm cone-shaped tear punctum dilator to dilate the tear punctum. If the dilation is too small, the fibrous tissue ring around the tear punctum will shrink, so that the tear punctum will recover when the dilator is removed; if the tear punctum is too large, the tear punctum will suffer certain tissue damage and cannot recover to its original state, or even rupture, which affects tear drainage.

[0007] Currently, surgical operations have fully entered the era of minimally invasive surgery, while the method of tear point expansion is still stuck in decades ago. Summary of the Invention

[0008] The present invention primarily addresses the technical problem of providing a minimally invasive punctal dilator. This device addresses the issue of lacrimal punctal dilation size being difficult to control on demand, enabling on-demand, one-step dilation of the punctum with minimal punctal damage and reduced tissue injury. Furthermore, because the punctum cannula supports the punctum after dilation, frictional resistance generated by punctal contraction and the lacrimal duct probe, which can affect the location of resistance during probing, is eliminated.

[0009] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a minimally invasive lacrimal dilator; comprising: a lacrimal dilator, which includes a conical head end and an expansion cone; the expansion cone has a large head end and a small head end along its axis, the conical head end is arranged at the small head end of the expansion cone, and the conical head end is an arc-shaped surface; the large head end of the expansion cone is integrally connected to the inner cylindrical section of the lacrimal cannula, the inner cylindrical section of the lacrimal cannula has an extension direction, and the inner cylindrical section of the lacrimal cannula is a cylinder with uniform cross-sectional diameters perpendicular to its extension direction; the edge of the inner cylindrical section of the lacrimal cannula is connected to the edge of the large head end of the expansion cone, and the inner cylindrical section of the lacrimal cannula is fixedly connected to a gripping portion at the end away from the expansion cone; and

[0010] The lacrimal cannula comprises a lacrimal cannula wall and a lacrimal cannula adapting surface; the lacrimal cannula wall is sleeved on the inner cylindrical section of the lacrimal cannula, and the lacrimal cannula wall and the inner cylindrical section of the lacrimal cannula can slide relative to each other; the lacrimal cannula wall has the lacrimal cannula adapting surface at one end close to the expansion cone.

[0011] Furthermore, the lacrimal cannula adaptable surface is a slope, and the lacrimal cannula adaptable surface of the slope continues backward with the same slope along the slope direction of the expansion cone slope, and the front end edge of the lacrimal cannula adaptable surface is connected to the outer edge of the large head end of the expansion cone.

[0012] Furthermore, the lacrimal cannula further comprises a structure that is located away from one end of the expansion cone and is integrally connected to the lacrimal cannula wall to prevent the lacrimal cannula from completely entering the lacrimal duct.

[0013] Furthermore, the structure of the anti-tear point sleeve that completely enters the lacrimal duct is a lacrimal point sleeve semicircular ring, and the lacrimal point sleeve semicircular ring is located at an end away from the expansion cone and is integrally connected to the lacrimal point sleeve wall;

[0014] The semicircular ring of the lacrimal cannula is located outside the wall of the lacrimal cannula;

[0015] The inner cylindrical section of the lacrimal cannula is fixedly connected to a lacrimal cannula support section at one end away from the expansion cone; the lacrimal cannula support section is truncated cone-shaped or cylindrical;

[0016] The outer diameter of one end of the lacrimal cannula support section close to the inner cylindrical section of the lacrimal cannula is consistent with the outer diameter of the lacrimal cannula semicircular ring;

[0017] The gripping portion is fixedly connected to one end of the lacrimal cannula support section away from the inner cylindrical section of the lacrimal cannula.

[0018] Furthermore, the surface of the semicircular ring of the lacrimal point cannula is a smooth round blunt surface to prevent damage to surrounding eye tissues.

[0019] Furthermore, a fixing structure is provided between the lacrimal cannula semicircular ring body and the lacrimal cannula supporting section;

[0020] The fixing structure can limit the relative rotation between the lacrimal cannula semicircular ring and the lacrimal cannula supporting section.

[0021] Furthermore, the fixing structure includes a slot provided on the semicircular ring of the lacrimal cannula and a pin provided on the head end of the supporting section of the lacrimal cannula;

[0022] The slots are assembled correspondingly to the pins.

[0023] Furthermore, the thickness of the lacrimal cannula wall is no more than 0.1 mm.

[0024] Furthermore, the conical tip is a hemisphere with a diameter of 0.2-0.5 mm; the diameter of the sphere of the conical tip can be as large as possible while being able to probe into the lacrimal point;

[0025] The plane end edge of the hemisphere is connected to the end edge of the expansion cone head.

[0026] Furthermore, the expansion cone is marked with scales at 1 mm and 2 mm from the cone head end near the side of the cone head end, so as to identify the depth of the lacrimal point dilator entering the lacrimal point and reduce the occurrence of false passages.

[0027] Furthermore, the outer diameter of the inner cylindrical section of the lacrimal cannula ranges from 0.6 to 1.2 mm; the inner diameter of the lacrimal cannula matches the outer diameter of the inner cylindrical section of the lacrimal cannula.

[0028] The beneficial effects of the present invention are as follows: After the lacrimal punctum dilator is dilated, the lacrimal punctum cannula naturally remains in the lacrimal punctum and lacrimal canaliculus, supporting the lacrimal punctum in place and providing high stability. The lacrimal duct probe can be easily and unobstructed in and out, eliminating the need for repeated pulling and searching for the lacrimal punctum (without the lacrimal punctum cannula, when the lacrimal duct is opened, the contraction of the lacrimal punctum and the friction with the lacrimal duct probe create significant resistance, making it difficult to accurately determine the location of the obstruction). The position of the resistance is clearly defined when the lacrimal duct is opened, making it easy to determine the location of the obstruction. Furthermore, the lacrimal punctum is dilated in one step, as needed, without damaging the lacrimal punctum, thus reducing tissue damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of a preferred embodiment of the minimally invasive lacrimal point dilator of the present invention;

[0030] Figure 2 This is one of the exploded schematic diagrams of a preferred embodiment of the minimally invasive lacrimal point dilator of the present invention;

[0031] Figure 3This is the second exploded schematic diagram of a preferred embodiment of the minimally invasive lacrimal point dilator of the present invention;

[0032] The markings of the components in the accompanying drawings are as follows:

[0033] 1. Conical head end; 2. Expansion cone; 3. Inner cylindrical section of the lacrimal cannula; 4. Support section of the lacrimal cannula; 5. Grip; 31. Wall of the lacrimal cannula; 32. Adaptive surface of the lacrimal cannula; 33. Semicircular ring of the lacrimal cannula; 331. Slot; 41. Pin. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, and in order to facilitate the understanding of its structure and function, some structures are not shown in proportion, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention. Here, some descriptive concepts in the embodiments are defined: the side close to the conical head end 1, that is, the side away from the gripping portion 5 is "lower", "head" or "front"; the side close to the gripping portion 5, that is, the side away from the conical head end 1 is "upper", "tail", "back" or "end". The side close to the geometric center line is the inside, and the side away from the geometric center line is the outside. The direction along the geometric center line is the "longitudinal", and the direction perpendicular to the geometric center line is the "horizontal".

[0035] See also Figure 1 、 Figure 2 and Figure 3 , an embodiment of the present invention includes: a lacrimal punctum dilator and a lacrimal punctum cannula. The lacrimal punctum dilator has a conical head end 1, which is a blunt arc surface, preferably a hemisphere, and the diameter of the sphere is 0.2~0.5mm; the blunt head end of the hemisphere makes it difficult to damage the lacrimal duct where the conical head end 1 contacts when the lacrimal punctum is expanded. If the conical head end 1 is sharp, it is very easy to damage the normal mucosa and other soft tissues and cause iatrogenic false duct formation. Therefore, in the case where the lacrimal punctum can be probed, the hemispherical diameter of the conical head end 1 can be as large as possible to reduce the possibility of iatrogenic damage as much as possible.

[0036] The rear end of the conical head end 1 of the hemisphere is connected to the front end of the expansion cone 2, and the end of the expansion cone 2 is integrally connected to the inner cylindrical section 3 of the lacrimal cannula. The inner cylindrical section 3 of the lacrimal cannula has an extension direction, and the inner cylindrical section 3 of the lacrimal cannula is a cylinder with a uniform cross-sectional diameter perpendicular to its extension direction. The edge of the cylinder directly continues with the expansion cone 2, and the diameter of the cylinder is 0.6~1.2mm, preferably 0.8mm and 1.0mm.

[0037] The inner cylindrical section 3 of the lacrimal cannula is externally connected to a matching lacrimal cannula. Specifically, the lacrimal cannula includes a lacrimal cannula wall 31, a lacrimal cannula adapting surface 32, and a lacrimal cannula semicircular ring 33. The lacrimal cannula wall 31 is sleeved on the inner cylindrical section 3 of the lacrimal cannula. The head end of the lacrimal cannula wall 31 has a lacrimal cannula adapting surface 32, and the lacrimal cannula adapting surface 32 is an inclined surface; the front inner edge of the lacrimal cannula adapting surface 32 is connected to the outer edge of the end of the expansion cone 2, and the lacrimal cannula adapting surface 32 continues backward with the same slope along the inclination direction of the inclined surface of the expansion cone 2; the end of the lacrimal cannula wall 31 is integrally connected with the lacrimal cannula semicircular ring 33. The lacrimal cannula semicircular ring 33 is outside the lacrimal cannula wall, does not affect the inner tube cavity diameter of the lacrimal cannula wall 31, and ensures that the edge is rounded and blunt without damaging the delicate eye tissue around it. The main function of the lacrimal cannula semicircular ring 33 is to prevent the lacrimal cannula from completely entering the lacrimal canaliculus and being difficult to remove after the operation.

[0038] It should be noted that the thickness of the lacrimal cannula wall 31 is no more than 0.1 mm, and is as thin as possible while still being able to support the expanded lacrimal punctum, so as to minimize additional lacrimal punctum expansion and reduce tissue damage.

[0039] The end of the inner cylindrical section 3 of the lacrimal punctum cannula is expanded and extended to form the lacrimal punctum cannula support section 4; the diameter of the head end of the lacrimal punctum cannula support section 4 is consistent with the outer diameter of the lacrimal punctum cannula semicircular ring body 33, and when the lacrimal punctum expands, force is applied to the lacrimal punctum cannula to press it into the lacrimal punctum, preventing the lacrimal punctum cannula from moving backward and failing to enter the lacrimal punctum when the lacrimal punctum expands.

[0040] The lacrimal cannula support section 4 can be extended to form a cylinder of the same diameter and then expanded to form the gripping portion 5, or it can be directly expanded to form the gripping portion 5 with the same conical slope as the expansion cone 2. The gripping portion 5 is a cylindrical structure with a rough surface design that increases friction and makes the grip more stable.

[0041] As a preferred embodiment of this embodiment, a fixing structure is provided between the semicircular ring 33 of the lacrimal cannula at the end of the lacrimal cannula wall 31 and the head end of the lacrimal cannula support section 4. Specifically, the fixing structure includes a slot 331 defined in the semicircular ring 33 of the lacrimal cannula and a pin 41 provided at the head end of the lacrimal cannula support section 4. The slot 311 can be assembled with the pin 41. During the lacrimal punctum dilation operation, the lacrimal punctum dilator can be rotated and slowly expanded into the lacrimal punctum, making it relatively easy to detect abnormal resistance at the tip or even the presence of an iatrogenic false passage.

[0042] As another preferred embodiment of the present invention, the expansion cone 2 is marked with scales at 1 mm and 2 mm away from the cone head end on one side close to the cone head end 1, so as to identify the depth of the lacrimal punctum dilator entering the lacrimal punctum during the vertical eyelid punctum expansion stage. The vertical section of the lacrimal canalicle is 1 to 2 mm. If the lacrimal punctum dilator enters too shallowly or too deeply and then turns to horizontal expansion to continue, a false channel may occur. The existence of the scale avoids blindness in the vertical eyelid punctum expansion stage, prevents the lacrimal punctum dilator from entering too shallowly or too deeply, and thus reduces the occurrence of false channels during lacrimal punctum expansion.

[0043] The method of using the minimally invasive lacrimal punctum dilator includes the following steps:

[0044] The assembled minimally invasive lacrimal dilator is pressed into the lacrimal punctum in the direction perpendicular to the eyelid margin. When the lacrimal punctum covers the 1mm scale line and does not cover the 2mm scale line, it turns to the direction parallel to the eyelid margin and continues to rotate the gripping part 5 inward to expand the lacrimal punctum. After the lacrimal punctum cannula wall 31 has completely entered the lacrimal punctum, it can be seen that the lacrimal punctum cannula semicircular body 33 is in contact with the lacrimal punctum. At this time, the lacrimal punctum dilator is pulled out and the lacrimal punctum cannula is left in the lacrimal punctum and lacrimal canaliculus. At this time, the lacrimal duct probe of the corresponding model can smoothly enter the hollow cavity of the lacrimal punctum cannula to probe the lacrimal duct.

[0045] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structures or equivalent process changes made using the contents of the present invention's description and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. Minimally invasive lacrimal point dilator, characterized in that: include: A conical head end and an expansion cone; the expansion cone has a large head end and a small head end along its axis, the conical head end is arranged at the small head end of the expansion cone, and the conical head end is an arc-shaped surface; the large head end of the expansion cone is integrally connected to the inner cylindrical section of the lacrimal cannula, the inner cylindrical section of the lacrimal cannula has an extension direction, and the inner cylindrical section of the lacrimal cannula is a cylinder with a uniform cross-sectional diameter perpendicular to its extension direction; the edge of the inner cylindrical section of the lacrimal cannula is connected to the edge of the large head end of the expansion cone, and the inner cylindrical section of the lacrimal cannula is fixedly connected to a gripping portion at the end away from the expansion cone; The lacrimal cannula comprises a lacrimal cannula wall, a lacrimal cannula adapting surface and a lacrimal cannula semicircular ring; the lacrimal cannula wall is sleeved on the inner cylindrical section of the lacrimal cannula, and the lacrimal cannula wall and the inner cylindrical section of the lacrimal cannula can slide relative to each other; The lacrimal cannula wall has the lacrimal cannula adaptable surface at one end close to the expansion cone; The lacrimal cannula adaptable surface is an inclined surface, and the inclined surface of the lacrimal cannula adaptable surface continues backward with the same slope along the slope direction of the expansion cone inclined surface, and the front inner edge of the lacrimal cannula adaptable surface is connected to the outer edge of the large end of the expansion cone; The end of the lacrimal cannula wall is integrally connected with the lacrimal cannula semicircular ring body, and the lacrimal cannula semicircular ring body is outside the lacrimal cannula wall; A fixing structure is provided between the semicircular ring body of the lacrimal cannula and the head end of the lacrimal cannula supporting section; The fixing structure includes a clamping groove provided on the semicircular ring body of the lacrimal punctum sleeve and a pin provided on the head end of the supporting section of the lacrimal punctum sleeve.

2. The minimally invasive lacrimal point dilator according to claim 1, characterized in that: The lacrimal cannula support section is truncated cone-shaped or cylindrical; The outer diameter of one end of the lacrimal cannula support section close to the inner cylindrical section of the lacrimal cannula is consistent with the outer diameter of the lacrimal cannula semicircular ring; The gripping portion is fixedly connected to one end of the lacrimal cannula support section away from the inner cylindrical section of the lacrimal cannula.

3. The minimally invasive lacrimal point dilator according to claim 1, characterized in that: The thickness of the lacrimal point cannula wall is no more than 0.1 mm.

4. The minimally invasive lacrimal point dilator according to claim 1, characterized in that: The conical head end is a hemisphere with a diameter of 0.2-0.5 mm; the plane end edge of the hemisphere is connected to the end edge of the expanded cone small head.

5. The minimally invasive lacrimal point dilator according to claim 1, characterized in that: The expansion cone is marked with scales at 1 mm and 2 mm from the cone head end near the cone head end.

6. The minimally invasive lacrimal point dilator according to claim 1, characterized in that: The diameter of the inner cylindrical section of the lacrimal cannula ranges from 0.6 to 1.2 mm; the inner diameter of the lacrimal cannula matches the diameter of the inner cylindrical section of the lacrimal cannula.

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