Lacrimal passage probe
By designing a combination of sheath, guide head, guide wire and orientation mechanism, the problems of damage, entanglement and uncertainty of direction of existing lacrimal duct probes during retrograde catheterization are solved, and a safer and smoother catheterization process is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2026-03-06
AI Technical Summary
Existing lacrimal duct probes are prone to damage, difficulty in placement, and guide wire entanglement and uncertain direction during retrograde catheterization, leading to operational difficulties and failures.
A lacrimal duct probe was designed, which uses a combination of a sheath, a guide head, a guide wire, and an orientation mechanism. The orientation mechanism fixes the direction of the guide wire's traction part, and the locking mechanism enables the guide wire and the sheath to move synchronously, reducing damage and entanglement and ensuring a smooth insertion process.
It effectively prevents damage and failure of the guide wire due to torsion during retrograde catheter placement, improves the safety and success rate of catheter placement, and simplifies the operation process.
Smart Images
Figure CN223969217U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a surgical instrument for abdominal ophthalmology, and in particular to a lacrimal duct probe used in lacrimal duct dredging and intubation surgery. Background Technology
[0002] Lacrimal duct intubation is a commonly used minimally invasive treatment for lacrimal duct obstruction and stenosis. There are two procedures: retrograde intubation and antegrade intubation. Retrograde intubation is more effective than antegrade intubation because it can accommodate larger diameter implants.
[0003] Retrograde catheter placement requires a delivery device, currently primarily a lacrimal probe combined with sutures. The lacrimal probe guides a guide wire through the lacrimal canaliculi, common canaliculus, and lacrimal sac, ultimately entering the nasolacrimal duct and exposing it outside the anterior nasal cavity. The implant is then attached to the guide wire and retracted retrogradely into the lacrimal duct to complete placement. However, existing retrograde catheter placement methods have the following drawbacks because the sheath and guide wire are single-lumen and move independently:
[0004] 1. The insertion process is prone to damage: Since the anatomical structure is almost right-angled when the probe enters the common lacrimal duct and lacrimal canaliculus from the nasolacrimal duct and lacrimal sac, the probe is easily delayed when it is withdrawn outward because the probe sheath and the guide wire move independently. As the guide wire is very thin, the delayed guide wire is prone to cutting damage at the corner.
[0005] 2. The placement process is difficult and prone to failure: Since the probe sheath and the return guide wire move independently, the return guide wire needs to be pulled separately to pull the implant upward. Since the return guide wire is a thin wire, it takes a lot of force to pull a large implant back in reverse, making placement difficult and even prone to failure.
[0006] 3. The guidewire is prone to tangling and its direction is uncertain: Because the guidewire moves within the same lumen, it is prone to twisting and tangling. Therefore, pushing the guidewire forward results in high resistance, often causing it to bend and even leading to insertion failure. Furthermore, because the guidewire is within the same lumen, it can point in any direction, even posteriorly into the pharynx, making it impossible to exit through the anterior nasal cavity, thus causing insertion failure.
[0007] Therefore, existing lacrimal duct probes need further improvement to better meet the needs of clinical operations. Summary of the Invention
[0008] The lacrimal duct probe of this invention features a directional mechanism that fixes the direction of the traction portion formed after the guidewire is bent. Indication via a marking mechanism at the proximal end of the sheath allows for easy extension of the guidewire's traction portion along the nasal cavity. Clinically, this facilitates easy exposure of the guidewire's traction portion from the nasal cavity. Simultaneously, a locking mechanism secures the guidewire to the sheath, enabling synchronized movement during retraction and effectively preventing accidental damage and catheter placement failure due to guidewire lag.
[0009] The lacrimal duct probe of this utility model includes a sheath 1, a guide head 2, a guide wire 3, and a directional mechanism 4, characterized in that:
[0010] A. The sheath 1 includes a working channel 11, and the guide head 2 is disposed at the front end of the sheath 1;
[0011] B. After the guide wire 3 is bent, a traction part 31 is formed at the bend. The traction part 31 is exposed on the outer side of the distal end of the working channel 11. The guide wire 3 extends along the working channel 11, and the proximal end protrudes from the proximal end of the working channel 11.
[0012] C. The orientation mechanism 4 is disposed on the guide head 2 and / or sheath 1 to fix the direction of the traction part 31 of the guide wire 3;
[0013] D. The guide head 2 drives the sheath 1 and the guide wire 3 through the lacrimal canaliculus, the common lacrimal duct, the lacrimal sac, and finally into the nasolacrimal duct. The guide wire 3 is pushed forward to expose the traction part 31 to the outside of the anterior nasal cavity. The lacrimal duct implant and the traction part 31 are connected together. Then the guide wire 3 is withdrawn to the distal end of the sheath 1. The sheath 1 and the guide wire 3 are withdrawn together to insert the lacrimal duct implant into the lacrimal duct.
[0014] The orientation mechanism 4 is typically located at the distal end of the sheath 1 or on the guide head 2. The orientation mechanism 4 fixes the direction of the traction portion 31 formed after the guide wire 3 is bent, ensuring that regardless of how the lacrimal probe 100 changes direction during insertion, the guide wire 3 will not twist or change direction due to twisting within the working channel 11. Twisting or changing the direction of the traction portion 31 often prevents it from being successfully exposed to the anterior nasal cavity through the nasolacrimal duct. Therefore, the orientation mechanism 4 effectively fixes the direction of the traction portion 31, allowing it to smoothly enter the nasal cavity along the direction of the nasolacrimal duct and be exposed to the anterior nasal cavity. This facilitates easy connection of the implant to the traction portion 31, better meeting the clinical needs of catheter placement.
[0015] The guide head 2 has a smooth, blunt tip. Since the guide head 2 needs to pass through the lacrimal canaliculi, common lacrimal duct, lacrimal sac and finally enter the nasolacrimal duct, it needs to change direction multiple times throughout the process. Since the diameter of the lumen is very small, the smooth, blunt tip design can minimize accidental damage to the lumen wall tissue during clinical operation.
[0016] The guide head 2 is composed of the traction part 31. The guide head 2 can be set independently or it can be composed of the traction part 31. When the guide head 2 is composed of the traction part 31, a fixing seat 13 can be set at the distal end of the sheath 1. Two guide holes 41 are horizontally arranged on the fixing seat 13. The two guide holes 41 constitute the orientation mechanism 4. The smooth end of the traction part 31 constitutes the guide head 2, which plays a role in probing and expanding during the insertion of the lacrimal duct probe 100. The fixing seat 13 can be connected to the distal end of the sheath 1 by interference fit, and / or bonding, and / or threaded connection, and / or snap-fit. To ensure the smooth progress of the insertion process, the end of the fixing seat 13 is usually arc-shaped or conical.
[0017] Furthermore, the guide head 2 is a smooth, conical blunt tip. This conical blunt tip structure allows for better penetration when the lacrimal duct probe 100 is inserted, while the conical structure, after penetration at the tip, provides good expansion at the rear.
[0018] The proximal end of the guide head 2 includes a connecting portion 22, which is connected to the distal end of the sheath 1. The traction portion 31 is disposed at the connecting portion 22. When the guide head 2 is used alone, it is connected to the sheath 1 via the connecting portion 22. During retraction, the traction portion 31 moves close to the connecting portion 22 to prevent the guide wire 3 from experiencing hysteresis, thus effectively preventing accidental cutting damage to the tissue during retraction. Simultaneously, it ensures that the guide wire 3 provides good fixation for the implanted material, guaranteeing a smooth retrograde catheter placement process.
[0019] The distal end of the connecting part 22 is provided with a guide groove 21. The curvature of the guide groove 21 is usually matched with the curvature of the nasolacrimal duct and the nasal cavity. When it enters the nasolacrimal duct, the guide wire 3 is pushed out. At this time, the traction part 31 is spread out and slides forward along the guide groove 21. It works together with the orientation mechanism 4 to push the traction part 31 forward in a preset direction along the set curvature that matches the nasolacrimal duct and the nasal cavity, so that it can enter the nasal cavity very smoothly and be exposed from the anterior nasal cavity.
[0020] Furthermore, the orientation mechanism 4 is disposed at the proximal end of the guide head 2. The orientation mechanism 4, being disposed at the proximal end of the guide head 2, allows for better matching of the curvature of the guide groove 21, and also simplifies the structure of the sheath 1, making the connection between the guide head 2 and the sheath 1 more convenient.
[0021] Two guide holes 41 are horizontally arranged on the cross-section of the connecting part 22. The two ends of the guide wire 3 pass through the guide holes 41 respectively. The guide holes 41 fix the direction of the guide wire 3. The two horizontally arranged guide holes 41 constitute the orientation mechanism 4.
[0022] This horizontal double-hole design ensures that, since the guide wire 3 passes through the guide holes 41 at both ends after bending, the traction part 31 formed by the bent guide wire 3 and the sheath 1 will remain stably horizontally aligned regardless of the rotation of the sheath 1, preventing twisting and thus maintaining a relatively stable orientation. Furthermore, the double-horizontal-hole design offers advantages such as simple structure and easy assembly. In clinical use, it also prevents errors or failures in the clinical procedure due to twisting or knotting of the guide wire 3 within the working channel 11. To further ensure that the guide wire 3 does not twist within the working channel 11, the sheath 1 can also be a double-cavity design containing two working channels 11, with each end of the guide wire 3 inserted into a different working channel 11.
[0023] The connecting part 22 is connected to the distal end of the sheath 1 by means of interference fit, and / or bonding, and / or threaded connection, and / or snap-fit. The applicant has only listed the above-mentioned connection methods. In practical applications, those skilled in the art can design other connection methods as needed, and can also connect the connecting part 22 together by one or more of the above connection methods. The applicant will not give examples here, but none of them depart from the protection scope of this application.
[0024] The sheath 1 is made of medical elastic material. Since the lacrimal duct probe 100 needs to pass through different lumens when entering the human body, and the direction of advancement also needs to change accordingly, the sheath 1 is made of medical elastic material so that the sheath 1 can elastically deform during the change of direction, making the insertion process of the lacrimal duct probe 100 smoother.
[0025] The medical elastic material is an ultra-slippery medical elastic material. The surface of the ultra-slippery medical elastic material can be designed with a hydrophilic coating, which makes the friction of the sheath 1 very small during insertion, and the insertion process will be very smooth.
[0026] The medical elastic material is a medical metallic elastic material, a medical polymer elastic material, or a medical composite elastic material. The medical elastic material can be shape memory alloy, elastic medical stainless steel, or elastic nylon. The applicant has only specifically listed the above-mentioned categories of elastic materials here. In practical applications, those skilled in the art can choose different medical elastic materials as needed. The applicant will not provide examples of each, but none of them depart from the scope of protection of this application.
[0027] The lacrimal duct probe 100 also includes a locking mechanism 5. When the locking mechanism 5 is locked, the guide wire 3 is locked, and the guide wire 3 moves synchronously with the sheath 1. When the locking mechanism 5 is relaxed, the guide wire 3 is released, and the guide wire 3 moves back and forth within the working channel 11. The design of the locking mechanism 5 allows the guide wire 3 to move synchronously with the sheath 1 as needed, so that the guide wire 3 can be pushed forward or retracted synchronously with the sheath 1, and also ensures that the guide wire 3 can move relative to the sheath 1, so that the guide wire 3 can be pushed out to expose the traction part 31.
[0028] The locking mechanism 5 is located at the proximal end of the sheath 1. To facilitate the doctor's operation, the locking mechanism 5 is usually located at the proximal end of the sheath 1, allowing the doctor to easily perform locking and loosening actions.
[0029] The locking mechanism 5 can lock and loosen the guide wire 3 by pressing, rotating, or other methods.
[0030] The locking mechanism 5 includes a locking spring 51, which is located at the proximal end of the working channel 11. The guide wire 3 passes through the locking spring 51. When the locking spring 51 is pressed down, the guide wire 3 is locked. The guide wire 3 moves synchronously with the sheath 1. When the locking spring 51 is relaxed, the guide wire 3 is released and moves back and forth within the working channel 11.
[0031] The design of the locking spring 51 allows the locking mechanism 5 to adapt to the locking and loosening of guide wires 3 of various diameters. When the diameter of the guide wire 3 is large, the degree of compression of the locking spring 51 is reduced; when the diameter of the guide wire 3 is small, the degree of compression of the locking spring 51 is increased, thereby ensuring that guide wires 3 of different diameters can be locked within the locking spring 51.
[0032] To achieve the downward pressure of the locking spring 51, various methods such as pressure block, screw rotation, and slider can be used to control the downward pressure of the locking spring 51.
[0033] The sheath 1 has a grip portion 12 at its proximal end. To facilitate the doctor's grip on the lacrimal duct probe 100, the grip portion 12 is provided at the proximal end of the sheath 1. The grip portion 12 is usually polygonal or has a pinching position to facilitate the doctor's stability and continuity during clinical operation.
[0034] The lacrimal duct probe 100 also includes an identification mechanism 6. The identification mechanism 6 can identify the status of the insertion and retraction process of the lacrimal duct probe 100 to ensure the smooth progress of the insertion and retrograde catheter placement process.
[0035] The marking mechanism 6 is a pointing marking mechanism 61 and / or a position marking mechanism 62 that indicates the direction of the orientation mechanism 4.
[0036] The directional marking mechanism 61 can mark the direction of movement of the guide wire 3 during the insertion process. The directional marking mechanism 61 can be in various marking states such as color or pattern. It can indicate the direction of the traction part 31 determined by the orientation mechanism 4, allowing doctors to visually determine the direction of the traction part 31 in the nasolacrimal duct during clinical operation. This enables rapid adjustment of the direction of the sheath 1 as needed, facilitating the smooth withdrawal of the traction part 31. The position marking mechanism 62 can mark the depth of insertion of the lacrimal probe 100 and whether the traction part 31 has retracted to the end of the sheath 1 during the withdrawal process.
[0037] The position marking mechanism 62 is a depth marking mechanism 62-1 disposed on the outside of the sheath 1, and / or a limiting marking mechanism 62-2 disposed on the guidewire 3 to indicate the retraction state of the traction part 31. The depth marking mechanism 62-1 is typically a scale mark, color mark, or area mark disposed on the outside of the sheath to facilitate medical personnel in confirming the position of the sheath 1 in the cavity. The limiting marking mechanism 62-2 is typically disposed at the proximal end of the guidewire 3. When the guidewire 3 is retracted, the limiting marking mechanism 62-2 being exposed at the proximal end of the sheath 1 indicates that the traction part 31 has retracted to the vicinity of the distal end of the sheath 1.
[0038] Furthermore, the guide wire 3 is an elastic wire. The guide wire 3 is typically made of elastic wire, which ensures that the guide wire 3 can form a smooth arc after bending to constitute the traction part 31. Moreover, the design of the elastic material also makes it easier for the guide wire 3 to be extended and retracted.
[0039] The guide wire 3 is a shape memory alloy elastic wire. Preferably, the guide wire 3 is made of shape memory alloy elastic wire. Shape memory alloy has good elasticity and fatigue resistance, which allows the guide wire 3 to be extended and retracted multiple times without deformation or bending.
[0040] The shape of the traction part 31 can be shaped as needed. Since the guide wire 31 is made of shape memory alloy, the shape of the traction part 31 can be pre-shaped according to the shape of the nasal cavity. After being pushed out of the nasolacrimal duct, the traction part 31 can return to the pre-shaped shape under the action of body temperature, so that it can be easily exposed from the anterior nasal cavity along the nasal cavity.
[0041] The guide wire 3 has a shape that matches the guide hole 41. To ensure the directional stability of the traction part 31, the guide wire 3 can be designed with a matching shape according to the guide hole 41, such as a semi-circle, ellipse, polygon, etc.
[0042] During assembly, the guide head 2 is connected to the far end of the sheath 1, and then the two ends of the guide wire 3 are passed through the guide hole 41 respectively until the two ends emerge from the near end of the sheath 1. The two ends of the guide wire 3 are pulled until the traction part 31 of the guide wire 3 is close to the guide hole 41.
[0043] In clinical use, the upper and lower lacrimal puncta are first anesthetized with mucosal anesthesia, then the lower opening of the nasolacrimal duct is anesthetized with a numbing cotton swab placed outside the lower opening of the nasolacrimal duct. The lacrimal puncta are then dilated, and the lacrimal duct probe 100 is inserted into the nasolacrimal duct through the lacrimal canaliculus, common lacrimal duct, and lacrimal sac using the traditional lacrimal duct probing method. When the numbing cotton swab is touched, it indicates that the probe has reached the lower opening of the nasolacrimal duct. At this point, the probe is stopped. The sheath 1 is fixed with one hand, and the guide wire 3 is pushed with the other hand until the traction part 31 is exposed outside the anterior nasal cavity. The implant is then connected, and antibiotic eye ointment is applied to the connection between the traction part 31 and the implant for lubrication. The guide wire 3 is then withdrawn until the limiting marking mechanism 62-2 is exposed at the proximal end of the sheath 1. At this point, the traction part 31 is considered to have been withdrawn to the distal end of the sheath 1. The locking mechanism 5 is then locked, and the lacrimal duct probe 100 is withdrawn as a whole, and the implant is placed into the lacrimal duct.
[0044] This utility model discloses a lacrimal duct probe comprising a sheath 1, a guide head 2, a guide wire 3, and a directional mechanism 4. The sheath 1 includes a working channel 11. The guide head 2 is disposed at the front end of the sheath 1, and the guide wire 3 is disposed within the working channel 11. The guide wire 3, after being bent, forms a traction portion 31 at the bend. The traction portion 31 is located on the distal outer side of the working channel 11, and the guide wire 3 extends along the working channel 11, with its proximal end protruding from the proximal end of the working channel 11. The directional mechanism 4 fixes the direction of the traction portion 31 of the guide wire 3. During retraction, the guide wire 3 and the sheath 1 are locked by the locking mechanism 5, allowing for complete retraction. The orientation mechanism 4 ensures that the direction of the traction part 31 is well fixed, allowing the traction part 31 to be smoothly exposed outside the anterior nasal cavity along the direction of the nasal cavity. The overall retraction process can effectively prevent the guide wire 3 from lag, better ensuring the safety and success of the catheter placement process and better meeting the clinical operation needs during catheter placement. Attached Figure Description
[0045] Figure 1 This is a perspective view of the lacrimal duct probe of this utility model when pressed and locked.
[0046] Figure 1-1 yes Figure 1 Enlarged view of point A.
[0047] Figure 1-2 yes Figure 1 The main view.
[0048] Figure 1-3 yes Figure 1-2 BB cross-sectional view.
[0049] Figure 1-4 yes Figure 1-3 Enlarged view of point C.
[0050] Figure 2 yes Figure 1 A 3D view of the guide wire being extended.
[0051] Figure 2-1 yes Figure 2 Enlarged view of point D.
[0052] Figure 2-2 yes Figure 2 The main view.
[0053] Figure 2-3 yes Figure 2-2 EE sectional view.
[0054] Figure 2-4 This is a schematic diagram of the structure of the tear duct probe of this utility model with dual channels.
[0055] Figure 2-5 yes Figure 2 Exploded view.
[0056] Figure 3 This is a perspective view of the tear duct probe of this utility model, in which the traction part constitutes the guide head.
[0057] Figure 3-1 yes Figure 3 Enlarged view of point F.
[0058] Figure 4 yes Figure 3 A schematic diagram of the structure when the guide wire is extended.
[0059] Figure 5 This is a perspective view of the tear duct probe of this utility model with threaded locking.
[0060] Figure 5-1 yes Figure 5 The main view.
[0061] Figure 5-2 yes Figure 5-1 GG cross-sectional view.
[0062] Figure 5-3 yes Figure 5 Exploded view.
[0063] Figure 6 This is a perspective view of the tear duct probe of this utility model with sliding locking.
[0064] Figure 6-1 yes Figure 6 The main view.
[0065] Figure 6-2 yes Figure 6-1 HH cross-sectional view.
[0066] Figure 6-3 yes Figure 6 Exploded view.
[0067] Figure 7 This is a schematic diagram of the structure of the lacrimal duct probe of this utility model, which features a one-way locking sliding mechanism.
[0068] Figure 7-1 yes Figure 7 Enlarged view of point I.
[0069] In the above figure:
[0070] 100 is the lacrimal duct probe of this utility model.
[0071] 1 is the sheath, 2 is the guide head, 3 is the guide wire, 4 is the orientation mechanism, 5 is the locking mechanism, and 6 is the marking mechanism.
[0072] 11 is the working channel, 12 is the gripping part, 13 is the fixed base; 12-1 is the pressing channel, and 12-11 is the internal thread.
[0073] 21 is the guide groove, and 22 is the connecting part.
[0074] 31 is the traction unit.
[0075] 41 is the guide hole.
[0076] 51 is a locking spring, 52 is a self-locking pressure block, 53 is a pressure bolt, 54 is a pressing handle, 55 is a limiting post, 56 is a return spring, 57 is a horizontal limiting plate; 52-1 is a self-locking thread, 54-1 is a limiting slide, 54-2 is a limiting groove, 57-1 is a horizontal return groove; 54-11 is a limiting block.
[0077] 61 is a directional marking mechanism, 62 is a position marking mechanism; 62-1 is a depth marking mechanism, and 62-2 is a limit marking mechanism. Detailed Implementation
[0078] Example: Lacrimal duct probe of this utility model
[0079] refer to Figures 1 to 2-5 The lacrimal duct probe of this embodiment includes a sheath 1, a guide head 2, a guide wire 3, a directional mechanism 4, a locking mechanism 5, and an marking mechanism 6.
[0080] refer to Figure 1-3 , Figure 1-4 , Figure 2-3 and Figure 2-5 The sheath 1 includes a working channel 11, the guide head 2 is disposed at the front end of the sheath 1, and the guide wire 3 is disposed within the working channel 11.
[0081] refer to Figure 1-1 , Figure 2-1 and Figure 2-5 The guide head 2 is provided separately. The proximal end of the guide head 2 includes a connecting portion 22, which is connected to the distal end of the sheath 1 via an interference fit. Two guide holes 41 are horizontally arranged on the cross-section of the connecting portion 22. Both ends of the guide wire 3 pass through the guide holes 41 and form a traction portion 31 at the bend. The guide wire 3 extends along the working channel 11, with its proximal end protruding from the proximal end of the working channel 11. The guide holes 41 fix the direction of the guide wire 3. The two horizontally arranged guide holes 41 constitute the orientation mechanism 4.
[0082] This horizontal double-hole design ensures that, since the guide wire 3 passes through the guide holes 41 at both ends after bending, the traction part 31 formed by the bent guide wire 3 and the sheath 1 will remain stably horizontally aligned regardless of the rotation of the sheath 1, preventing twisting and thus maintaining a relatively stable orientation relationship between them. Furthermore, the double-horizontal-hole design offers advantages such as simple structure and easy assembly. In clinical use, it also prevents errors or failures in the clinical procedure due to twisting or knotting of the guide wire 3 within the working channel 11.
[0083] refer to Figure 2-4 In order to ensure that the guide wire 3 does not twist completely in the working channel 11, the sheath 1 can also be a dual-cavity design containing two working channels 11, with the two ends of the guide wire 3 respectively inserted into different working channels 11.
[0084] refer to Figure 3 , Figure 3-1 and Figure 4 The guide head 2 can also be formed by the traction part 31. When the guide head 2 is formed by the traction part 31, a fixing seat 13 can be provided at the distal end of the sheath 1. Two guide holes 41 are horizontally arranged on the fixing seat 13. The two guide holes 41 constitute the orientation mechanism 4. The smooth end of the traction part 31 constitutes the guide head 2, which plays a role in probing and expanding during the insertion of the lacrimal duct probe 100. The fixing seat 13 can be connected to the distal end of the sheath 1 by interference fit, and / or bonding, and / or threaded connection, and / or snap-fit. To ensure the smooth progress of the insertion process, the end of the fixing seat 13 is usually arc-shaped or conical.
[0085] refer to Figures 1 to 3-1 In this embodiment, the marking mechanism 6 can identify the status of the insertion and retraction process of the lacrimal duct probe 100 to ensure the smooth progress of the insertion and retrograde catheter placement process.
[0086] The marking mechanism 6 includes a pointing marking mechanism 61 that indicates the direction of the orientation mechanism 4 and a location marking mechanism 62.
[0087] The directional marking mechanism 61 can mark the direction of movement of the guide wire 3 during the insertion process. The directional marking mechanism 61 can be in various marking states such as color or pattern. It can indicate the direction of the traction part 31 determined by the orientation mechanism 4, allowing doctors to visually determine the direction of the traction part 31 in the nasolacrimal duct during clinical operation. This enables rapid adjustment of the direction of the sheath 1 as needed, facilitating the smooth withdrawal of the traction part 31. The position marking mechanism 62 can mark the depth of insertion of the lacrimal probe 100 and whether the traction part 31 has retracted to the end of the sheath 1 during the withdrawal process.
[0088] The position marking mechanism 62 is a depth marking mechanism 62-1 disposed on the outside of the sheath 1, and / or a limiting marking mechanism 62-2 disposed on the guidewire 3 to indicate the retraction state of the traction part 31. The depth marking mechanism 62-1 is typically a scale mark, color mark, or area mark disposed on the outside of the sheath to facilitate medical personnel in confirming the position of the sheath 1 in the cavity. The limiting marking mechanism 62-2 is typically disposed at the proximal end of the guidewire 3. When the guidewire 3 is retracted, the limiting marking mechanism 62-2 being exposed at the proximal end of the sheath 1 indicates that the traction part 31 has retracted to the vicinity of the distal end of the sheath 1.
[0089] The sheath 1 is provided with a grip portion 12 at its proximal end, and the grip portion 12 is provided with a pointing indicator mechanism 61 that can indicate the direction of the orientation mechanism 4.
[0090] To facilitate the doctor's grip on the lacrimal duct probe 100, a gripping part 12 is provided at the proximal end of the sheath 1. The gripping part 12 is usually polygonal or has a pinching position to facilitate the doctor's stability and continuity during clinical operation.
[0091] refer to Figure 1 and Figure 2 In this embodiment, the pointing identification mechanism 61 is a pointing icon. The pointing identification mechanism 61 can also be various identification states such as color and pattern. The identification mechanism 61 can indicate the direction of the traction part 31 determined by the orientation mechanism 4, so that during clinical operation, the doctor can intuitively judge the direction of the traction part 31 in the nasolacrimal duct, so that the direction of the sheath 1 can be quickly adjusted as needed in clinical practice, so that the traction part 31 can be smoothly pushed out.
[0092] refer to Figure 1 and Figure 2The outer side of the sheath 1 is provided with a depth marking mechanism 62-1. In this embodiment, the depth marking mechanism 62-1 is a scale. In actual applications, the depth marking mechanism 62 can also be a color mark, a position mark, or other marking mechanism, so as to facilitate clinicians to intuitively judge the depth of the sheath 1 entering the body during clinical operations, so as to determine which lumen the guide head 2 is located in.
[0093] refer to Figure 1-2 and Figure 2-5 The guide wire 3 is provided with the limiting marking mechanism 62-2. When the guide wire 3 is retracted, the limiting marking mechanism 62-2 is exposed at the proximal end of the sheath 1, which can be identified as the traction part 31 has been retracted to the vicinity of the distal end of the sheath 1.
[0094] The guide head 2 is typically a smooth, blunt tip. Since the guide head 2 needs to pass through the lacrimal canaliculi, common lacrimal duct, lacrimal sac, and finally enter the nasolacrimal duct, it needs to change direction multiple times throughout the process. Since the diameter of the lumen is very small, the smooth, blunt tip design can minimize accidental damage to the lumen wall tissues during clinical operation.
[0095] Preferably, in this embodiment, the guide head 2 is a smooth, conical blunt tip. The conical blunt tip structure allows for better penetration when the lacrimal duct probe 100 is inserted, while the conical structure, after penetration at the tip, provides good expansion at the rear.
[0096] The guide head 2 is connected to the sheath 1 via the connecting part 22. When the traction part 31 is retracted, it is close to the connecting part 22 to ensure that the guide wire 3 does not produce a hysteresis effect, thereby effectively preventing the hysteresis guide wire 3 from accidentally cutting or damaging the tissue during the retraction process, while ensuring that the guide wire 3 provides a good fixation effect for the implanted object, so as to ensure the smooth progress of the retrograde catheter placement process.
[0097] refer to Figure 1 and Figure 2 The distal end of the connecting part 22 is provided with a guide groove 21. The curvature of the guide groove 21 is usually matched with the curvature of the nasolacrimal duct and the nasal cavity. When it enters the nasolacrimal duct, the guide wire 3 is pushed out. At this time, the traction part 31 is spread out and slides forward along the guide groove 21. It works together with the orientation mechanism 4 to push the traction part 31 forward in a preset direction along the set curvature that matches the nasolacrimal duct and the nasal cavity, so that it can enter the nasal cavity very smoothly and be exposed from the anterior nasal cavity.
[0098] In this embodiment, the connecting part 22 is connected to the distal end of the sheath 1 by an interference fit. In practical applications, the connecting part 22 can also be connected to the distal end of the sheath 1 by adhesive bonding, and / or threaded connection, and / or snap-fit. The applicant has only listed the above-mentioned connection methods. In practical applications, those skilled in the art can design other connection methods as needed, and can also connect the connecting part 22 by one or more of the above-mentioned connection methods. The applicant will not give examples of each method here, but none of them depart from the protection scope of this application.
[0099] The sheath 1 is made of medical elastic material. Since the lacrimal duct probe 100 needs to pass through different lumens when entering the human body, and the direction of advancement also needs to change accordingly, the sheath 1 is made of medical elastic material so that the sheath 1 can elastically deform during the change of direction, making the insertion process of the lacrimal duct probe 100 smoother.
[0100] The medical elastic material is an ultra-slippery medical elastic material. The surface of the ultra-slippery medical elastic material can be designed with a hydrophilic coating, which makes the friction of the sheath 1 very small during insertion, and the insertion process will be very smooth.
[0101] The medical elastic material is a medical metallic elastic material, a medical polymer elastic material, or a medical composite elastic material. The medical elastic material can be shape memory alloy, elastic medical stainless steel, or elastic nylon. The applicant has only specifically listed the above-mentioned categories of elastic materials here. In practical applications, those skilled in the art can choose different medical elastic materials as needed. The applicant will not provide examples of each, but none of them depart from the scope of protection of this application.
[0102] In this embodiment, the lacrimal duct probe 100 further includes a locking mechanism 5. When the locking mechanism 5 is locked, the guide wire 3 is locked, and the guide wire 3 moves synchronously with the sheath 1. When the locking mechanism 5 is relaxed, the guide wire 3 is released, and the guide wire 3 moves back and forth within the working channel 11. The design of the locking mechanism 5 allows the guide wire 3 to move synchronously with the sheath 1 as needed, so that the guide wire 3 can be pushed forward or retracted synchronously with the sheath 1, and also ensures that the guide wire 3 can move relative to the sheath 1, so that the guide wire 3 can be pushed out to expose the traction part 31.
[0103] The locking mechanism 5 is located at the proximal end of the sheath 1. To facilitate the doctor's operation, the locking mechanism 5 is usually located at the proximal end of the sheath 1, allowing the doctor to easily perform locking and loosening actions.
[0104] In this embodiment, the locking mechanism 5 uses a locking spring structure to lock and release the guide wire 3. The design of the locking spring 51 allows the locking mechanism 5 to adapt to locking and releasing guide wires 3 of various diameters. When the diameter of the guide wire 3 is large, the degree of compression of the locking spring 51 is reduced; when the diameter of the guide wire 3 is small, the degree of compression of the locking spring 51 is increased, thereby ensuring that guide wires 3 of different diameters can be locked within the locking spring 51.
[0105] To achieve the downward pressure of the locking spring 51, various methods such as pressure block, screw rotation, and slider can be used to control the downward pressure of the locking spring 51.
[0106] refer to Figure 1-3 , Figure 1-4 , Figure 2-3 , Figure 2-4 The locking mechanism 5 uses a pressing method to lock and loosen the guide wire 3.
[0107] The locking mechanism 5 includes a locking spring 51 and a self-locking block 52. The locking spring 51 is located near the end of the working channel 11, and the guide wire 3 passes through the locking spring 51. The gripping part 12 is provided with a pressing channel 12-1. One end of the self-locking block 52 is provided with a self-locking thread 52-1. After the self-locking block 52 enters through the pressing channel 12-1, rotating the self-locking block 52 allows the self-locking thread 52-1 to form a fixed connection with the locking spring 51. Pressing down on the self-locking block 52 compresses the locking spring 51, locking the guide wire 3, which then moves synchronously with the sheath 1. Releasing the pressure causes the locking spring 51 to relax under the action of elastic restoring force, releasing the guide wire 3, which then moves back and forth within the working channel 11.
[0108] refer to Figures 5 to 5-3 The locking mechanism 5 uses rotation to lock and loosen the guide wire 3.
[0109] The locking mechanism 5 includes a locking spring 51 and a pressure bolt 53. The locking spring 51 is located near the end of the working channel 11, and the guide wire 3 passes through the locking spring 51. The inner side of the pressing channel 12-1 is provided with an internal thread 12-11 that mates with the pressure bolt. When the pressure bolt 53 is rotated, under the action of the internal thread 12-11, the pressure bolt 53 compresses the locking spring 51, locking the guide wire 3. The guide wire 3 moves synchronously with the sheath 1. Because the pressure bolt 53 can stably compress and fix the locking spring 51, continuous force is not required during use, and the downward stroke can be easily controlled as needed to adapt to the locking requirements of guide wires 3 with different diameters. Rotating the pressure bolt 53 upwards relaxes the locking spring 51, releasing the guide wire 3, which then moves back and forth within the working channel 11.
[0110] refer to Figures 6 to 6-3 The locking mechanism 5 uses a sliding method to lock and loosen the guide wire 3.
[0111] The locking mechanism 5 includes a locking spring 51, a pressing handle 54, a limiting post 55, a return spring 56, and a horizontal limiting plate 57. The pressing handle 54 is provided with a limiting slide 54-1, and the limiting slide 54-1 is provided with a limiting block 54-11. The limiting post 55 is provided on the grip part 12, and the return spring 56 is provided in the horizontal return groove 57-1 of the horizontal limiting plate 57, with one end abutting against the limiting post 55 and the other end abutting against the side wall of the horizontal return groove 57-1. When the pressing handle 54 is pressed down, the limiting slide 54-1 slides relative to the limiting post 55. The limiting post 55 slides to the limiting block 54-11, and the return spring 56 is compressed under the restriction of the horizontal limiting plate 57. The pressing handle 54 is in the pressed state, the locking spring 51 is in the locked state, and the guide wire 3 is locked. The guide wire 3 and the sheath 1 move synchronously. If the pressing handle 54 is pressed down again, under the restoring action of the relaxed return spring 56, the limiting post 55 passes the limiting block 54-11. The limiting post 55 continues to move along the limiting slide 54-1, the locking spring 51 is relaxed, the guide wire 3 is released, and the guide wire 3 moves back and forth within the working channel 11. This sliding locking and loosening method is very simple to operate through simple repeated pressing, and it can stably compress and fix the locking spring 51. During use, it is not necessary to apply continuous force to the pressure bolt 53.
[0112] To prevent the risk of cross-infection that may result from repeated use during clinical use, the locking mechanism 5 can also be set to a one-way locking state to prevent the lacrimal duct probe 100 from being reused.
[0113] refer to Figure 7 and Figure 7-1 The locking mechanism 5 includes a locking spring 51, a pressing handle 54, a limiting post 55, a return spring 56, and a horizontal limiting plate 57. The pressing handle 54 has a limiting groove 54-2. The limiting post 55 is located on the grip portion 12. The return spring 56 is located within the horizontal return groove 57-1 of the horizontal limiting plate 57, with one end abutting against the limiting post 55 and the other end abutting against the side wall of the horizontal return groove 57-1. When the pressing handle 54 is pressed downwards, it moves downwards against the limiting post 55. When it reaches the limiting groove 54-2, the limiting post 55 is embedded within the limiting groove 54-2, and the locking spring 51 is compressed to lock the guide wire 3. The guide wire 3 is locked, and the guide wire 3 moves synchronously with the sheath 1. Since the limiting post 55 cannot be unlocked after being embedded in the limiting groove 54-2, the lacrimal duct probe 100 cannot be reused, thus ensuring single-use in clinical practice and avoiding clinical risks such as cross-infection that may result from reuse.
[0114] In this embodiment, the guide wire 3 is an elastic wire, which ensures that the guide wire 3 can form a smooth arc after bending to form the traction part 31. Moreover, the design of the elastic material also makes it easier for the guide wire 3 to be pushed out and pulled back.
[0115] Preferably, the guide wire 3 is made of shape memory alloy elastic wire. Shape memory alloy has good elasticity and fatigue resistance, so that the guide wire 3 can be extended and retracted multiple times without deformation or bending.
[0116] Since the guide wire 31 is made of shape memory alloy, the shape of the traction part 31 can be pre-shaped according to the shape of the nasal cavity. After being pushed out of the nasolacrimal duct, the traction part 31 can be restored to the pre-shaped shape under the action of body temperature, so that it can be easily exposed from the anterior nasal cavity along the nasal cavity.
[0117] The guide wire 3 has a shape that matches the guide hole 41. To ensure the directional stability of the traction part 31, in addition to the conventional circular cross-sectional shape, the guide wire 3 can also be designed with a matching shape according to the guide hole 41, such as semi-circular, elliptical, polygonal, etc.
[0118] During assembly, the guide head 2 is connected to the far end of the sheath 1, and then the two ends of the guide wire 3 are passed through the guide hole 41 respectively until the two ends emerge from the near end of the sheath 1. The two ends of the guide wire 3 are pulled until the traction part 31 of the guide wire 3 is close to the guide hole 41.
[0119] In clinical use, the upper and lower lacrimal puncta are first anesthetized with mucosal anesthesia, then the lower opening of the nasolacrimal duct is anesthetized with a numbing cotton swab placed outside the lower opening of the nasolacrimal duct. The lacrimal puncta are then dilated, and the lacrimal duct probe 100 is inserted into the nasolacrimal duct through the lacrimal canaliculus, common lacrimal duct, and lacrimal sac using the traditional lacrimal duct probing method. When the numbing cotton swab is touched, it indicates that the probe has reached the lower opening of the nasolacrimal duct. At this point, the probe is stopped. The sheath 1 is fixed with one hand, and the guide wire 3 is pushed with the other hand until the traction part 31 is exposed outside the anterior nasal cavity. The implant is then connected, and antibiotic eye ointment is applied to the connection between the traction part 31 and the implant for lubrication. The guide wire 3 is then withdrawn until the limiting marking mechanism 62-2 is exposed at the proximal end of the sheath 1. At this point, the traction part 31 is considered to have been withdrawn to the distal end of the sheath 1. The locking mechanism 5 is then locked, and the lacrimal duct probe 100 is withdrawn as a whole, and the implant is placed into the lacrimal duct.
[0120] The lacrimal duct probe of this embodiment employs a directional mechanism 4. This mechanism 4 fixes the direction of the traction portion 31 formed by bending the guide wire 3. This ensures that regardless of any changes in the direction of the lacrimal duct probe 100 during insertion, the guide wire 3 will not twist or change direction due to twisting within the working channel 11. Twisting or changing the direction of the traction portion 31 often prevents it from being smoothly pushed out of the anterior nasal cavity through the nasolacrimal duct. Therefore, the directional mechanism 4 effectively fixes the direction of the traction portion 31, allowing it to smoothly enter the nasal cavity along the direction of the nasolacrimal duct and be exposed outside the anterior nasal cavity. This facilitates the easy connection of any indwelling lacrimal duct or silicone tube to the traction portion 31. Meanwhile, the locking mechanism 5 allows the guide wire 3 and the sheath 1 to move synchronously during the retraction of the lacrimal duct probe 100, effectively preventing the guide wire 3 from lagging behind. This effectively avoids the risk of accidental tissue cutting and damage caused by the lag of the guide wire 3, as well as the possibility of difficulty or even failure in retrograde catheter placement, thus better ensuring the safety and success of the catheter placement process and better meeting the clinical operation needs during catheter placement.
[0121] It should be noted that the structures disclosed and described herein can be replaced by other structures with the same effect, and the embodiments described herein are not the only structures for implementing this utility model. Although preferred embodiments of this utility model have been described and illustrated herein, those skilled in the art will understand that these embodiments are merely illustrative, and those skilled in the art can make numerous variations, improvements, and substitutions without departing from this utility model. Therefore, the scope of protection of this utility model should be defined in accordance with the spirit and scope of the appended claims.
Claims
1. A lacrimal probe (100) comprising a sheath (1), a guide head (2), a guide wire (3) and a directional mechanism (4), characterized in that: A. the sheath (1) comprises a working channel (11), and the guide head (2) is arranged at the front end of the sheath (1); B. the guide wire (3) is bent to form a traction part (31) at the bending part, the traction part (31) is exposed outside the distal end of the working channel (11), the guide wire (3) extends along the working channel (11), and the proximal end protrudes from the proximal end of the working channel (11); C. the directional mechanism (4) is arranged on the guide head (2) and / or the sheath (1) to fix the direction of the traction part (31) of the guide wire (3); D. the lacrimal probe (100) passes through the lacrimal canaliculus, the common lacrimal duct, the lacrimal sac and finally enters the nasolacrimal duct, after reaching the outlet of the nasolacrimal duct, the guide wire (3) is pushed forward to expose the traction part (31) to the external nares, the lacrimal passage is connected with the traction part (31), and then the guide wire (3) is withdrawn to the distal end of the sheath (1), and the sheath (1) and the guide wire (3) are withdrawn together to place the lacrimal passage into the lacrimal passage.
2. The punctum plug of claim 1, wherein: The guide head (2) is a smooth blunt head.
3. The punctum plug of claim 2, wherein: The guide head (2) is composed of the traction part (31).
4. The punctum plug of claim 2, wherein: The guide head (2) is a smooth conical blunt head.
5. The punctum plug of claim 2, wherein: The proximal end of the guide head (2) comprises a connecting part (22), the connecting part (22) is connected with the distal end of the sheath (1), and the traction part (31) is arranged at the connecting part (22).
6. The punctum plug of claim 5, wherein: The distal end of the connecting part (22) is provided with a guide groove (21).
7. The punctum plug of claim 5, wherein: The directional mechanism (4) is arranged at the proximal end of the guide head (2).
8. The punctum plug of claim 7, wherein: Two guide holes (41) are horizontally arranged on the cross section of the connecting part (22), the two ends of the guide wire (3) pass through the guide holes (41) respectively, the guide holes (41) fix the direction of the guide wire (3), and the two horizontally arranged guide holes (41) constitute the directional mechanism (4).
9. The punctum plug of claim 5, wherein: The connecting part (22) is connected with the distal end of the sheath (1) by interference fit, adhesion, threaded connection and / or concave-convex clamping.
10. The punctum plug of claim 1, wherein: The sheath (1) is made of medical elastic material.
11. The punctum plug of claim 10, wherein: The medical elastic material is super-smooth medical elastic material.
12. The punctum plug of claim 10, wherein: The medical elastic material is medical metal elastic material, or medical high polymer elastic material, or medical composite elastic material.
13. The punctum plug of claim 1, wherein: The lacrimal probe (100) further comprises a locking mechanism (5), when the locking mechanism (5) is locked, the guide wire (3) is locked, the guide wire (3) and the sheath (1) realize synchronous movement, when the locking mechanism (5) is relaxed, the guide wire (3) is released, and the guide wire (3) realizes back-and-forth movement in the working channel (11).
14. The punctum plug of claim 13, wherein: The locking mechanism (5) is arranged at the proximal end of the sheath (1).
15. The punctum plug of claim 13, wherein: The locking mechanism (5) contains a locking spring (51), which is arranged at the proximal end of the working channel (11), the guide wire (3) passes through the locking spring (51), the guide wire (3) is locked by pressing the locking spring (51) downward, the guide wire (3) and the sheath (1) realize synchronous movement, the guide wire (3) is released by relaxing the locking spring (51), and the guide wire (3) realizes back-and-forth movement in the working channel (11).
16. The punctum plug of claim 1, wherein: The proximal end of the sheath (1) is provided with a holding part (12).
17. The punctum plug of claim 1, wherein: The lacrimal passage probe (100) further contains an identification mechanism (6).
18. The punctum plug of claim 17, wherein: The identification mechanism (6) refers to a pointing identification mechanism (61) indicating the direction of the orientation mechanism (4), and / or a position identification mechanism (62).
19. The punctum plug of claim 18, wherein: The position identification mechanism (62) is a depth identification mechanism (62-1) arranged outside the sheath (1), and / or a limit identification mechanism (62-2) arranged on the traction part (31) of the guide wire (3) in the retracted state.
20. The punctum plug of claim 1, wherein: The guide wire (3) is an elastic wire.
21. The punctum plug of claim 20, wherein: The guide wire (3) is a shape memory alloy elastic wire.
22. The punctum plug of claim 21, wherein: The shape of the traction part (31) is shaped as needed.
23. The punctum plug of claim 8, wherein: The guide wire (3) has a shape matching the guide hole (41).