A hand-held vernier arc gauge for measuring muscle advancement in small incisions

Abstract

The utility model discloses a handheld vernier arc ruler suitable for muscle rearward migration measurement of small incision, including handle and arc ruler, one end of handle and the proximal end of arc ruler rotatory connection, and handle and arc ruler relative rotation have certain friction, the distal end of arc ruler is equipped with a slightly convex positioning indentation hook to the inside of arc ruler, the arc of arc ruler adapts the arc of eyeball sclera, and arc ruler can be through conjunctival incision on eyeball and extend into conjunctiva below, and when exerting certain pressure, positioning indentation hook can leave indentation mark on the surface of sclera below conjunctiva. The ruler designed in the utility model is arc ruler, and the arc is matched with the arc of sclera protruding in front, better adheres to the anatomical structure of eyeball, reduces the risk of iatrogenic scleral injury caused by arc ruler contact with the outer surface of sclera, reduces the damage to surrounding tissues in the operation process, reduces the operation risk, alleviates the discomfort of patient, reduces the operation of intraoperative surgeon, shortens the operation time.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a handheld vernier caliper suitable for measuring muscle migration in small incisions. Background Technology

[0002] Lateral rectus muscle suspension is an ophthalmic surgery primarily used to treat exotropia, especially in patients with large-angle exotropia. This surgery uses sutures to suspend the severed ends of the extraocular muscle, allowing them to adhere and heal naturally at a pre-designed location against the sclera, thus weakening the function of the lateral rectus muscle. Clinically, suspension surgery is often combined with classic large-incision surgeries, such as limbal trapezoidal incisions or fornix incisions. While this provides better surgical field exposure, the large incision, poor postoperative healing, and prolonged recovery time negatively impact postoperative outcomes and patient satisfaction.

[0003] In large-incision combined lateral rectus muscle suspension surgery, the commonly used surgical ruler is mainly the Castroviejo ophthalmic ruler. When measuring, a large incision is required in the bulbar conjunctiva, up to 15mm in diameter. The large visual field exposure can meet the ophthalmologist's requirements for the accuracy of the measurement results. However, excessive traction on the bulbar conjunctiva during the operation can easily cause postoperative bulbar conjunctival edema, which is more damaging to the patient.

[0004] Therefore, we use a small incision surgical technique for patients with large-angle exotropia, which has the advantages of minimizing trauma to the ocular surface, avoiding unnecessary trauma and bleeding, and having a shorter postoperative recovery time than traditional strabismus surgery.

[0005] Due to the reduced incision size leading to intraoperative visual field loss, traditional Castroviejo ophthalmic gauges cannot accurately measure muscle migration. To address these issues, this invention provides a novel handheld vernier caliper suitable for measuring muscle migration in strabismus surgery with small incisions. Utility Model Content

[0006] 1. Technical problem to be solved: For the measurement of muscle migration in small-incision, large-angle exotropia surgery, the traditional Castroviejo ophthalmic gauge is too large and cannot accurately measure the migration through a small incision. This can easily lead to incision traction and tearing, increase postoperative inflammation, and hinder postoperative healing.

[0007] To address the aforementioned technical problems, this utility model provides a handheld vernier caliper suitable for measuring muscle migration through small incisions.

[0008] 2. Technical Solution: A handheld vernier arc scale suitable for measuring muscle migration through small incisions includes a handle and an arc scale. One end of the handle is rotatably connected to the proximal end of the arc scale, and the handle and the arc scale have a certain frictional force when rotated relative to each other. The distal end of the arc scale is provided with a positioning indentation hook that protrudes slightly inward toward the arc scale. The arc of the arc scale is adapted to the arc of the sclera of the eyeball. The arc scale can be inserted under the conjunctiva through a conjunctival incision on the eyeball, and when a certain pressure is applied, the positioning indentation hook can leave an indentation mark on the scleral surface under the conjunctiva. The arc-shaped upper surface of the arc scale is provided with an arc length scale, the zero point of the arc length scale coincides with the position of the positioning indentation hook. The arc-shaped upper surface of the arc scale is provided with a groove, in which a vernier is slidably connected. When the arc scale is inserted under the conjunctiva, the vernier is located outside the conjunctival incision.

[0009] Furthermore, the near end of the arc ruler is provided with an outwardly protruding connecting lug, which is connected to the end of the handle near the arc ruler by a stud. The stud is provided with a pre-tightening knob, which is used to adjust the friction force when the arc ruler rotates relative to the handle.

[0010] Furthermore, a non-slip grip sleeve is fixedly fitted onto the handle.

[0011] Furthermore, the corners of the arc ruler are rounded, and the end of the positioning indentation hook is a blunt cut.

[0012] Furthermore, the cross-section of the groove is narrower on the outside and wider on the inside, the vernier is fixed on the sliding block, and the sliding block is slidably connected to the groove.

[0013] Furthermore, the handle is 5cm long and 3mm in diameter.

[0014] Furthermore, the inner diameter of the arc ruler is 12mm, the arc length is 15mm, the thickness is 1mm, and the width is 8mm.

[0015] Furthermore, the vernier is in the form of a sheet, with a width of 0.5 mm and a height of 1 cm.

[0016] Furthermore, the depth of the tip of the positioning indentation hook is 0.1 mm.

[0017] Furthermore, the handle, arc ruler, vernier, and positioning indentation hook are all made of stainless steel, and the anti-slip grip is made of silicone with raised anti-slip patterns.

[0018] 3. Beneficial effects: (1) The ruler designed in this utility model is an arc ruler, the curvature of which matches the curvature of the sclera, so as to better fit the anatomical structure of the eyeball, thereby reducing the risk of iatrogenic scleral damage caused by the arc ruler contacting the outer surface of the sclera, reducing damage to surrounding tissues during the operation, thereby reducing the surgical risk, alleviating the patient's discomfort, reducing the operation of the surgeon during the operation, and shortening the operation time.

[0019] (2) The positioning indentation hook designed in this utility model is very small in size, which can help mark new muscle insertion points; the tip of the indentation hook is shallow and will not penetrate the sclera layer, which is low-risk, conducive to postoperative healing, and improves patient satisfaction. The adjustable angle between the arc ruler and the handle and the vernier design of this utility model can accurately move backward, which can help the operation to be more precise, delicate and convenient.

[0020] (3) The present invention is small in size, with an arc ruler thickness of 1mm and a width of 8mm. The arc design allows it to better adapt to the curve of the eyeball. It can be placed under the bulbar conjunctiva through a small incision without cutting the entire bulbar conjunctiva, reducing excessive traction, alleviating postoperative inflammatory response, causing less damage to the patient, and providing better protection for the patient's recovery. The presence of the vernier allows the doctor to adjust the position of the vernier appropriately according to the strabismus angle within the limited surgical exposure field, which can more accurately measure the lateral rectus muscle recession, especially suitable for the operation of small incision large angle exotropia recession. Attached Figure Description

[0021] Figure 1 This is a front view of the handheld vernier arc ruler of this utility model; Figure 2 This is a top view of the handheld vernier arc ruler of this utility model; Figure 3 This is a schematic diagram of the cross-section of the groove of the arc ruler of this utility model. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] As attached Figure 1 To be continued Figure 3 , Example 1: A handheld vernier arc scale suitable for measuring muscle migration through small incisions includes a handle 1 and an arc scale 2. One end of the handle 1 is rotatably connected to the proximal end of the arc scale 2, and the handle 1 and the arc scale 2 have a certain frictional force when they rotate relative to each other. The distal end of the arc scale 2 is provided with a positioning indentation hook 3 that protrudes slightly towards the inside of the arc scale 2. The curvature of the arc scale 2 is adapted to the curvature of the sclera of the eyeball. The arc scale 2 can be inserted under the conjunctiva through the conjunctival incision on the eyeball, and when a certain pressure is applied, the positioning indentation hook 3 can leave an indentation mark on the scleral surface under the conjunctiva. The arc-shaped upper surface of the arc scale 2 is provided with an arc length scale 4, and the zero point of the arc length scale 4 coincides with the position of the positioning indentation hook 3. The arc-shaped upper surface of the arc scale 2 is provided with a groove 5, and a vernier 6 is slidably connected in the groove 5. When the arc scale 2 is inserted under the conjunctiva, the vernier 6 is located outside the conjunctival incision.

[0024] When using the handheld vernier caliper of this embodiment in strabismus surgery, a small incision is first made in the patient's conjunctiva. Then, the angle between the handle 1 and the caliper 2 is adjusted to allow the doctor to make corresponding adjustments to the grip posture for different degrees of posterior displacement, facilitating the operation. Due to the influence of friction, the two can maintain the angle after adjustment. The distal end of the caliper 2 is inserted from the incision in the patient's conjunctiva to the underside of the conjunctiva. The depth of insertion is adjusted. During adjustment, the vernier 6 remains at a certain reference point on the eyeball, for example, directly opposite the pupil. The long axis of the caliper is on the horizontal line of the lateral rectus muscle. The caliper 2 is continuously inserted until the depth indicated by the vernier 6 is consistent with the preset depth in the treatment plan. When pressure is applied to the caliper 2, the positioning indentation hook 3 will form an indentation on the scleral surface. This indentation is the muscle insertion point. The sclera and lateral rectus muscle at this point are sutured and suspended to complete the surgery.

[0025] The arc ruler 2 in this embodiment is designed in an arc shape to fit the anatomical structure of a normal adult eyeball. The arc ruler 2 is small in size and can be placed directly under the conjunctiva through a small incision along the surface of the eyeball without having to cut the entire conjunctiva, reducing postoperative inflammatory response and minimizing damage to the patient.

[0026] Example 2: The proximal end of the arc-shaped ruler 2 has a connecting lug 7 protruding outwards. The connecting lug 7 is connected to the end of the handle 1 near the arc-shaped ruler 2 via a stud 8. The stud 8 is equipped with a pre-tightening knob 9, which is used to adjust the amount of friction when the arc-shaped ruler 2 rotates relative to the handle 1. In this embodiment, the amount of friction is adjusted by the pre-tightening knob 9 to ensure that the angle after the arc-shaped ruler 2 and the handle 1 rotate relative to each other remains unchanged during operation, thus avoiding affecting the surgical procedure.

[0027] Example 3: A non-slip grip sleeve 10 is fixedly fitted on the handle 1 to increase the friction of the handle 1 and make it easier to grip.

[0028] Example 4: The edges and corners of the arc ruler 2 are rounded to prevent mechanical abrasion when it is inserted under the conjunctiva. The end of the positioning indentation hook has a blunt cut for positioning.

[0029] Example 5: The cross-section of the slide groove 5 is narrow on the outside and wide on the inside. The vernier 6 is fixed on the sliding block, and the sliding block is slidably connected to the slide groove 5. The narrow-on-the-outside-wide-on-the-inside structure can prevent the vernier 6 from falling out of the slide groove 5 when sliding, thus avoiding accidental damage.

[0030] Example 6: The handheld vernier arc ruler of this embodiment has a handle 1 that is 5cm long and 3mm in diameter.

[0031] Arc ruler 2 is designed based on the normal adult eyeball, which has a diameter of 24mm, and 15mm is the maximum posterior displacement of the lateral rectus muscle. Therefore, the inner radius of arc ruler 2 is set at 12mm, the arc length at 15mm, the scale range at 0-15mm, the thickness at 1mm (allowing it to extend below the conjunctiva), and the width at 8mm, approximately the width of the extraocular muscle. Vernier 6 is plate-shaped, 0.5mm wide and 1cm high, allowing doctors to easily adjust and slide it using their thumb and forefinger to determine the position of the posteriorly displaced muscle.

[0032] The tip of the positioning indentation hook is 0.1mm deep. The sclera of a normal adult is 0.3mm thick, and 0.1mm will not puncture the sclera and cause penetrating damage, which is conducive to postoperative healing.

[0033] The handle 1, arc ruler 2, vernier 6, and positioning indentation hook 3 are all made of stainless steel, ensuring long-term use, strong corrosion resistance, and resistance to various chemical substances. They are highly durable, capable of withstanding repeated use and high-temperature sterilization, and are not easily deformed or damaged. They possess high strength and toughness, facilitating smooth ophthalmic surgery. They are resistant to weak corrosive media such as air, steam, and water, and are not prone to rust. The anti-slip grip is made of silicone with raised anti-slip patterns, providing a firm grip and facilitating the surgeon's handling. It is resistant to high and low temperatures, reusable, and can be sterilized at high temperatures.

[0034] Although the present invention has been disclosed above with reference to preferred embodiments, these are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection of the claims of this application.

Claims

1. A handheld vernier caliper suitable for measuring muscle recession through small incisions, characterized in that, The device includes a handle and an arc ruler. One end of the handle is rotatably connected to the proximal end of the arc ruler, and the handle and the arc ruler have a certain frictional force when they rotate relative to each other. The distal end of the arc ruler is provided with a positioning indentation hook that protrudes slightly towards the inside of the arc ruler. The arc of the arc ruler is adapted to the arc of the sclera of the eyeball. The arc ruler can be inserted under the conjunctiva through a conjunctival incision on the eyeball, and when a certain pressure is applied, the positioning indentation hook can leave an indentation mark on the scleral surface under the conjunctiva. The arc-shaped upper surface of the arc ruler is provided with an arc length scale, and the zero point of the arc length scale coincides with the position of the positioning indentation hook. The arc-shaped upper surface of the arc ruler is provided with a sliding groove, and a vernier is slidably connected in the sliding groove. When the arc ruler is inserted under the conjunctiva, the vernier is located outside the conjunctival incision.

2. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 1, characterized in that, The near end of the arc ruler is provided with a connecting lug that protrudes outward. The connecting lug is connected to the end of the handle near the arc ruler by a stud. The stud is provided with a pre-tightening knob, which is used to adjust the amount of friction when the arc ruler rotates relative to the handle.

3. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 1 or 2, characterized in that, The handle is fixedly fitted with an anti-slip grip sleeve.

4. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 3, characterized in that, The corners of the arc ruler are rounded, and the end of the positioning indentation hook is blunt.

5. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 4, characterized in that, The cross-section of the groove is narrow on the outside and wide on the inside. The vernier is fixed on the sliding block, and the sliding block is slidably connected to the groove.

6. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 5, characterized in that, The handle is 5cm long and 3mm in diameter.

7. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 6, characterized in that, The arc ruler has an inner diameter of 12mm, an arc length of 15mm, a thickness of 1mm, and a width of 8mm.

8. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 7, characterized in that, The vernier is in the shape of a sheet, with a width of 0.5 mm and a height of 1 cm.

9. A handheld vernier caliper for measuring muscle recession in small incisions according to claim 8, characterized in that, The depth of the positioning indentation hook tip is 0.1 mm.

10. A handheld vernier caliper for measuring muscle recession in small incisions according to any one of claims 4-9, characterized in that, The handle, arc ruler, vernier, and positioning indentation hook are all made of stainless steel, while the anti-slip grip is made of silicone with raised anti-slip patterns.

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