CN201055466Y - New Cataract Capsulotomy Knife - Google Patents

Abstract

This invention addresses the inconvenience of current anterior capsule resection instruments in cataract surgery by providing a novel cataract resection knife. It consists of a blade, a needle shaft, and a needle plug. The end of the blade is connected to the front end of the needle shaft, and the other end of the needle shaft is fixedly connected to the needle plug. This invention can increase the success rate of surgery, reduce the chance of infection, and significantly shorten the operation time.

Description

New Cataract Capsulotomy Knife

1. Technical field:

The utility model relates to a novel cataract cystectomy knife, which belongs to the technical field of medical instruments and supplies.

2. Background technology:

Capsulectomy is an important step in modern cataract extraction. Successful cystectomy is the key to the success of the entire operation, and it is often the most difficult step for beginners. The lens is a biconvex transparent tissue. The back is more convex than the front, with a diameter of 9-10 mm and an anteroposterior diameter of 4.5-5 mm. Located between the iris and the vitreous, it is fixed to the ciliary body by the zonules of the lens. The anterior lens capsule is a layer of transparent and elastic basement membrane; the posterior capsule is the product of embryonic epithelial cells. Under normal circumstances, the thickness of each part of the lens capsule is different. The thickest part of the anterior capsule is about 3 mm from the center of the anterior pole, while the thickest part of the posterior capsule is about 4 mm from the center of the posterior pole. It is relatively thin, and the posterior pole is thinner than the front pole. The thinnest part is only 2 microns, and the thickest part can reach 20 microns. It is very easy to break when subjected to a slight mechanical trauma. The lens capsule becomes thicker with age, but when suffering from age-related cataract, the lens capsule has different degrees of thinning or degeneration. In addition, the thickness and toughness of the cataract capsule of different properties and stages are also different. The capsule of congenital cataracts and cataracts complicated by young and middle-aged cataracts is relatively tough, while the capsule of overmature cataracts is relatively thin and occasionally ruptures spontaneously. . Any external force acting on the lens can displace the lens, and the radial distribution of the anterior lens zonules can generate radial tension on the surface of the anterior capsule. In this case, the cut capsular flap extends toward the equator; all the way to the periphery of the lens. Because the capsule is relatively thin in this part, it may be difficult to pull the capsular flap back to the center. In fact the tear has reached the attachment of the ligament. At this time, the rift inevitably reaches the equator. A successful capsulotomy should be round with a diameter of about 6 mm and neat edges, and the cystic band formed at this time is more resistant to tension than the cystic bands of other incisions.

The current tools for capsulectomy include capsulotomy needle, capsulorhexis forceps, and capsulotomy forceps and Nd:YAG laser or electrocautery, but each has its shortcomings.

1. Cystotomy needle: Although it is easy to obtain materials and easy to make, the hook shape formed by the bending of the tip of the front end cannot form a blade that is consistent with the longitudinal axis of the needle stem, but two blades that are perpendicular to the longitudinal axis of the needle stem. The shearing force of the capsule is not easy to control, and it is remade from a disposable syringe needle, which is random and increases the risk of cystectomy failure. It is mostly used for open-jaw capsulectomy, and the incision of the anterior capsule formed is not neat, the stability of the capsule bag is poor, and it is easy to split radially to the periphery.

2. Capsulorhexis forceps and capsulorhexis forceps: the former needs to cut a triangular anterior capsule valve with a sharp instrument before entering the anterior chamber capsulorhexis; After the capsule is punctured, the capsulorhexis can be performed. It can be seen that this instrument actually has two steps, firstly puncture the anterior capsule, and then grasp the anterior capsule flap to tear. This instrument is mostly used in the continuous annular capsulorhexis technique. The purpose of continuous annular capsulorhexis is to form a neat resection opening with high stability of the capsular bag, which is conducive to the operation in the lens capsular bag. However, it requires high skills and close cooperation of hands, eyes, and feet, and it is difficult to turn the capsulorhexis near the incision. The large capsulorhexis forceps can cause blind spots for the operator and increase the probability of capsulorhexis failure. In overmature cataract, the anterior capsule is brittle, difficult to grasp during capsulorhexis, and tends to split radially to the periphery, increasing the failure rate of surgery.

Both 3Nd:YAG laser capsulotomy and electrocautery anterior capsulotomy require special instruments, which are cumbersome and increase the cost of the patient.

3. Contents of the invention

The utility model aims at the inconvenient operation of the anterior lens capsule capsule cutting device in the current cataract operation, and provides a novel cataract capsule cutting knife which is easy to use and low in cost and can improve the success rate of the operation.

A new type of cataract cystectomy knife is composed of a knife head, a needle stem and a needle plug; the rear end of the knife head is connected with the front end of the needle stem, and the other end of the needle stem is fixedly connected with the needle bolt.

The knife head is provided with a knife tip and a knife body, the knife body and the needle stem form an included angle of 90-135 degrees, and the knife tip bends toward the needle stem side.

The knife point and the knife body have a knife edge on the side of the needle stem.

The needle stem is provided with a front stem and a back stem, the angle between the front stem and the back stem is 120-135 degrees, and the outer surface of the front stem has scales.

There is a hollow tube inside the needle barrel, and the diameter of the hollow tube is 0.01-0.05mm.

The length of the front stem of the needle barrel is 6mm.

The method of using the utility model is: after the scleral tunnel is completed in the cataract operation, puncture the anterior chamber with a triangular puncture knife, inject viscoelastic agent, fix the cystotomy knife on the nipple of the syringe through a needle plug and make the knife head enter the anterior chamber , measure the diameter of the opening of the anterior capsule, which is exactly the length of the anterior stem of the needle stem, that is, 6mm, penetrate the anterior capsule from the 12 o'clock position and cut clockwise and counterclockwise to the 6 o'clock position, dock the two semicircles, and then separate with multiple points of water , water layer, move the lens nucleus to make it tilt and rotate in the capsular bag. Then go to the next surgical step.

The beneficial effects of the utility model are:

1. The sickle-shaped knife head in the utility model can cut open the anterior capsule conveniently, and the incision is smooth, the capsule bag has good stability, and will not split radially to the periphery, which can increase the success rate of the operation.

2. The length of the front stem of the needle stem in the utility model is the optimal opening diameter for surgery, which makes it easier for doctors to grasp the size of the surgical wound during surgery.

3. The utility model combines the instruments required for the two steps of cystectomy and injection in cataract surgery, which can effectively reduce the number of surgical instruments entering the anterior chamber, thereby reducing the probability of wound infection caused by instrument contamination.

4. The utility model combines the instruments required for the two steps of capsulectomy and injection in cataract surgery, which saves the inconvenience caused by frequent replacement of instruments during the operation and shortens the operation time.

5. The utility model has the advantages of simple operation, low production cost and high cost performance.

4. Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the structure of the cutter head.

Among them: 1. Knife head, 2. Needle stem, 3. Needle plug, 4. Knife tip, 5. Knife body, 6. Blade, 7. Front stem, 8. Back stem, 9. Hollow tube.

Below in conjunction with accompanying drawing 1 of description, illustrate by way of example, but the scope of protection claimed by the utility model is not limited thereto.

5. Specific implementation

Example 1

The utility model is a novel cataract cystectomy knife, which is composed of a cutter head 1, a needle stem 2 and a needle plug 3; 3 fixedly connected; the knife head 1 is provided with a knife point 4 and a knife body 5, the knife body 5 forms an angle of 120 degrees with the needle stem 2, and the knife point 4 is bent toward the needle stem 2 side; the knife point 4, The knife body 5 has a blade 6 on the side of the needle stem 2; the needle stem 2 is provided with a front stem 7 and a rear stem 8, the angle between the front stem 7 and the rear stem 8 is 120 degrees, and the outer surface of the front stem 7 has a scale There is a hollow tube 9 inside the needle barrel 2, and the diameter of the hollow tube 9 is 0.05mm; the length of the front stem 7 of the needle barrel 2 is 6mm, and the length of the rear stem 8 is 10mm.

Example 2

The utility model is a novel cataract cystectomy knife, which is composed of a cutter head 1, a needle stem 2 and a needle plug 3; 3 fixedly connected; the knife head 1 is provided with a knife tip 4 and a knife body 5, the knife body 5 forms an angle of 90 degrees with the needle stem 2, and the knife tip 4 is bent toward the needle stem 2 side; the knife tip 4, The knife body 5 has a blade 6 on the side of the needle stem 2; the needle stem 2 is provided with a front stem 7 and a rear stem 8, the angle between the front stem 7 and the rear stem 8 is 135 degrees, and the outer surface of the front stem 7 has a scale There is a hollow tube 9 inside the needle barrel 2, and the diameter of the hollow tube 9 is 0.01mm; the length of the front stem 7 of the needle barrel 2 is 6mm, and the length of the rear stem 8 is 10mm.

Example 3

The utility model is a novel cataract cystectomy knife, which is composed of a cutter head 1, a needle stem 2 and a needle plug 3; 3 fixedly connected; the knife head 1 is provided with a knife tip 4 and a knife body 5, the knife body 5 forms an angle of 110 degrees with the needle stem 2, and the knife tip 4 is bent toward the needle stem 2 side; the knife tip 4, The knife body 5 has a blade 6 on the side of the needle stem 2; the needle stem 2 is provided with a front stem 7 and a rear stem 8, the angle between the front stem 7 and the rear stem 8 is 130 degrees, and the outer surface of the front stem 7 has a scale There is a hollow tube 9 inside the needle barrel 2, and the diameter of the hollow tube 9 is 0.04mm; the length of the front stem 7 of the needle barrel 2 is 6mm, and the length of the rear stem 8 is 10mm.

Claims (6)

1. A new type of cataract cystotomy knife, consisting of a needle stem and a needle plug, is characterized in that it also includes a cutter head, the rear end of the cutter head is connected with the front end of the needle stem, and the other end of the needle stem is fixed with the needle plug connect. 2. The novel cataract capsulotomy knife according to claim 1, characterized in that, the blade head is provided with a blade point and a blade body, the blade body and the needle stem form an angle of 90-135 degrees, and the blade point faces toward the needle stem. Curved side. 3. The novel cataract capsulotomy knife according to claim 2, characterized in that, said knife tip and knife body have a blade on the side of the needle stem. 4. The novel cataract capsulotomy knife according to claim 1, wherein the needle stem is provided with an anterior stem and a posterior stem, the angle between the anterior stem and the posterior stem is 120-135 degrees, and the outer surface of the anterior stem is There are scales. 5. The novel cataract capsulotomy according to claim 4, characterized in that there is a hollow tube inside the needle stem, and the diameter of the hollow tube is 0.01-0.05 mm. 6. The novel cataract capsulotomy knife as claimed in claim 4, wherein the length of the front stem of the needle stem is 6mm.

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