Glass cutting head for ophthalmic vitrectomy

Abstract

The utility model discloses a vitrectomy head for vitrectomy in the ophthalmology department, and relates to the technical field of medical instruments, the vitrectomy head comprises a rear end grab handle part, a front end part and a knife pouch connecting seat which are detachably connected in sequence, the front end part is formed by splicing half shell parts on the two sides, and an outer knife pouch is connected to the knife pouch connecting seat; the rear end of the rear-end grab handle part is provided with an installation cavity with an opening extending to the end face, a piston cavity is formed in the installation cavity through a blocking part detachably installed in the installation cavity, a piston part matched with the piston cavity is connected with the core cylinder into a whole through two elastic check rings, and one end of the core cylinder penetrates through the blocking part to extend outwards. The other end of the core cylinder penetrates through the rear-end grab handle part and extends into the front-end part, the inner cutter core connected with the core cylinder penetrates through the front-end part and extends into the outer cutter sleeve, a cutter return air path communicated with one end of the piston cavity is arranged in the rear-end grab handle part, and a cutter feeding air path communicated with the other end of the piston cavity is arranged in the blocking part. The operation cost is low, and resources are saved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a vitrectomy head for ophthalmic vitrectomy. Background Art

[0002] The vitreous is a colorless, transparent, semisolid, gel-like substance that fills the space between the retina and the lens, providing refraction and retinal fixation. As a refractive medium, the vitreous also fills the interior of the eye, maintaining its shape. Bleeding, inflammation, trauma, and degenerative diseases such as tumors can easily cause vitreous lesions, which are typically categorized as vitreous opacity, vitreous hemorrhage, and vitreous proliferation. Vitreous lesions generally require surgical treatment, such as vitrectomy.

[0003] Vitrectomy is a procedure that involves removing cloudy or diseased vitreous using a vitrectomy head. However, existing vitrectomy heads are generally disposable due to their high level of integration, such as CN217245134U and CN110996864B, and are sterilely packaged. This results in high costs, a significant financial burden for most patients, and significant waste of resources. Furthermore, the increase in medical waste also places a certain burden on the environment. Utility Model Content

[0004] In view of this, the present application provides a vitreous cutting head for ophthalmic vitrectomy to solve the technical problems of existing vitreous cutting heads, such as high cost and waste of resources due to high integration and disposable use.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A vitrectomy head for ophthalmic vitreous cutting comprises a rear end handle portion, a front end portion and a knife sleeve connecting seat which are detachably connected in sequence, the front end portion being formed by splicing half shell portions on both sides, an outer knife sleeve being connected to the knife sleeve connecting seat, the rear end of the rear end handle portion having an opening extending to a mounting cavity on the end face, a blocking portion detachably installed in the mounting cavity forms a piston cavity in the mounting cavity, a piston portion cooperating with the piston cavity is connected to a core barrel as a whole through two elastic retaining rings, one end of the core barrel extends outward through the blocking portion, the other end of the core barrel extends into the front end portion through the rear end handle portion, an inner knife core connected to the core barrel passes through the front end portion and extends into the outer knife sleeve, a return knife air path connected to one end of the piston cavity is provided in the rear end handle portion, and a feed knife air path connected to the other end of the piston cavity is provided in the blocking portion.

[0007] Furthermore, the corresponding ends of the core barrel have at least two mating grooves extending axially, and the mating block located on the end of the inner knife core can slide into the corresponding mating groove, and the nut connected to the core barrel is supported on the mating block, so that the core barrel and the inner knife core can be detachably connected.

[0008] Furthermore, a ventilation groove that can extend to the cutting edge is provided on the outer side surface of the outer blade sleeve.

[0009] Furthermore, the piston part includes a piston middle part and a first plug body and a second plug body with the same diameter respectively arranged at both ends of the piston middle part. The diameter of the piston middle part is larger than the diameter of the first plug body. The first plug body slides in cooperation with the matching cavity arranged on the blocking part. At least one ball is provided on the outer peripheral surface of the piston middle part, and a spiral groove is provided on the inner wall of the piston cavity to cooperate with the ball. The piston part rotates synchronously with the core barrel.

[0010] Furthermore, a pressure balancing air path is provided in the middle of the piston and runs through the piston in the axial direction, and the pressure balancing air path is located on the outer ring of the first plug body.

[0011] Furthermore, the connection point between the core barrel and the inner blade core is located in the accommodating cavity at the front end portion, and a through hole is provided on the front end portion for communicating the accommodating cavity with the outside world.

[0012] Furthermore, the front end portion is connected to the rear end handle portion through an elastic clamping arm and a bayonet matching structure, and the knife sleeve connecting seat is connected to the front end portion through an elastic clamping arm and a bayonet matching structure.

[0013] It can be seen from the above technical solution that the advantages of the utility model are:

[0014] 1. In the present application, due to the detachable design structure of the knife sleeve connecting seat and the front end portion, partial replacement of the outer knife sleeve can be achieved by replacing the knife sleeve connecting seat. Due to the detachable front end portion and the detachable connection structure between the piston portion and the core barrel, the core barrel and the inner knife core can be replaced separately, and the front end portion, the rear end handle portion, the piston portion, and the blocking portion can be reused by disinfection, thereby reducing the generation of medical waste and reducing the cost of use.

[0015] 2. In this application, the inner blade core can choose to use linear reciprocating motion or spiral movement during the glass cutting head assembly process according to its own structure, which has better applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0017] Figure 1 This is a schematic diagram of the structure of this application.

[0018] Figure 2This is a schematic diagram of the connection structure between the core barrel and the inner knife core of this application.

[0019] Explanation of the reference numerals: 1-rear end handle; 11-return blade air path; 12-installation cavity; 13-through hole; 2-front end; 21-accommodating cavity; 3-knife sleeve connecting seat; 31-limiting protrusion; 4-outer knife sleeve; 41-venting groove; 5-inner knife core; 51-matching block; 6-core tube; 61-matching groove; 7-piston part; 71-middle part of the piston; 72-first plug body; 73-second plug body; 74-pressure balance air path; 8-elastic retaining ring; 9-blocking part; 91-feed blade air path; 10-nut; 20-sealing ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail in conjunction with the embodiments and drawings. Here, the illustrative embodiments of this application and their descriptions are used to explain this application, but are not intended to limit this application.

[0021] refer to Figures 1 to 2 ,like Figure 1As shown, this embodiment provides a vitrectomy head for ophthalmic vitreous body cutting, comprising a rear end handle portion 1, a front end portion 2, and a knife sleeve connecting seat 3 that can be detachably connected in sequence. The front end portion 2 is formed by splicing two half shell portions. The knife sleeve connecting seat 3 is connected to an outer knife sleeve 4. The rear end of the rear end handle portion 1 has a mounting cavity 12 with an opening extending to the end surface. A blocking portion 9 that is detachably installed in the mounting cavity 12 forms a piston cavity in the mounting cavity 12. A piston portion 7 that cooperates with the piston cavity is connected to a core barrel 6 as a whole through two elastic retaining rings 8. One end of the core barrel 6 extends outward through the blocking portion 9, and the other end of the core barrel 6 extends through the rear end handle portion 1 to the front end portion 2. The inner knife core 5 connected to the core barrel 6 passes through the front end portion 2 and extends into the outer knife sleeve 4. A return knife air path 11 connected to one end of the piston chamber is provided in the rear end handle portion 1, and a feed knife air path 91 connected to the other end of the piston chamber is provided in the blocking portion 9. Sealing rings 20 are provided between the core barrel 6 and the rear end handle portion 1 and between the core barrel 6 and the blocking portion 9. The two sealing rings 20 are respectively located at both ends of the piston portion 7. The outer knife sleeve 4 can be replaced by replacing the knife sleeve connecting seat 3. After the blocking part 9 is removed, the piston part 7 can be separated from the core tube 6 by removing the elastic retaining ring 8. One end of the core tube 6 is also exposed by removing the front end part 2. After the piston part 7 is separated from the core tube 6, it is convenient to pull out the core tube 6 and the inner knife core 5 from the side of the head. Since the interior of the rear end handle part 1, the blocking part 9, the piston part 7, and the front end part 2 will not be contaminated by body fluids, the rear end handle part 1, the blocking part 9, the piston part 7, and the front end part 2 are fully disinfected on the outside and carefully disinfected on the inside through existing disinfection technology, and can be used for a second time, which can greatly save the cost of use. At the same time, the specification conversion can be achieved by replacing the front end part 2 with different inner holes and the knife sleeve connecting seat 3 with outer knife sleeves 4 of different sizes, so that different patients can use it.

[0022] In this embodiment, the front end portion 2 is connected to the rear end handle portion 1 through an elastic clamping arm and a bayonet matching structure, and the knife sleeve connecting seat 3 is connected to the front end portion 2 through an elastic clamping arm and a bayonet matching structure, wherein the specific structure of the elastic clamping arm and the bayonet matching can refer to the elastic buckle structure in the prior art, and the use of the knife sleeve connecting seat 3 can prevent the two side half shells of the front end portion 2 from accidentally separating, thereby making the structure of the front end portion 2 stable.

[0023] In the present application, when the core barrel 6 and the inner blade core 5 are fixedly connected as one, they need to be replaced as a whole.

[0024] In this embodiment, the corresponding ends of the core barrel 6 have at least two mating grooves 61 extending axially. The mating block 51 located on the outer periphery of the end of the inner blade core 5 can slide into the corresponding mating groove 61. The nut 10 connected to the core barrel 6 is supported on the mating block 51. The inner blade core 5 is inserted into the inner hole of the core barrel 6, so that the core barrel 6 and the inner blade core 5 can be detachably connected, which is convenient for the separate replacement of the inner blade core 5. The core barrel 6 can be reused after disinfection, further reducing costs and saving resources.

[0025] In order to ensure a good sealing performance at the connection between the core barrel 6 and the inner blade core 5, a sealing member, such as a sleeved sealing ring or a sealing gasket clamped between the core barrel 6 and the inner blade core 5, may be provided at the connection between the core barrel 6 and the inner blade core 5. In order to reduce the contamination of the interior of the vitreous cutting head by the residue in the core barrel 6, the core barrel 6 is cleaned with a disinfectant before the vitreous cutting head is disassembled to reduce the contamination of the inner hole of the rear end handle portion 1 by the residue splashing during the disassembly process.

[0026] In this embodiment, the outer surface of the outer blade sheath 4 is provided with a vent groove 41 that extends to the incision site. During the negative pressure adsorption process, the vent groove 41 is used to supply air to the incision site, providing positive pressure on the diseased tissue, keeping the diseased tissue close to the incision site and preventing the diseased tissue from detaching during the excision process. The process is simple.

[0027] In this embodiment, the connection between the core barrel 6 and the inner blade core 5 is located in the accommodating cavity 21 of the front end portion 2. The outer diameter of the nut 10, the maximum outer diameter of the inner blade core 5 where the matching block 51 is provided, and the outer diameter of the core barrel 6 are the same. The core barrel 6 and the accommodating cavity 21 are slidably matched. The accommodating cavity 21 guides the core barrel 6 and then guides the inner blade core 5. A through hole 13 is provided on the front end portion 2 for connecting the accommodating cavity 21 with the outside world to avoid air pressure extrusion when the inner blade core 5 advances or negative pressure in the accommodating cavity 21 when retracting, causing power loss, so that the control of the inner blade core 5 is more sensitive.

[0028] In this embodiment, the piston portion 7 includes a piston middle portion 71 and a first plug body 72 and a second plug body 73 of the same diameter respectively arranged at both ends of the piston middle portion 71. The diameter of the piston middle portion 71 is larger than the diameter of the first plug body 72, and the diameter of the accommodating cavity 21 matches the piston middle portion 71, which is convenient for the installation of the piston portion 7. The first plug body 72 slides with the matching cavity provided on the blocking portion 9. At least one ball is provided on the outer peripheral surface of the piston middle portion 71, and a spiral groove matching the ball is provided on the inner wall of the piston cavity. The piston portion 7 rotates synchronously with the core barrel 6 through a key connection or screw pressing method, so that the inner knife core 5 rotates during the feeding process, so that the surgical cutting effect is better.

[0029] The piston part 7 adopts the above-mentioned structure, and the blocking part 9 is installed to form a complete air path control system. The first plug body 72 and the second plug body 73 are provided with a sealing ring 20, so that the gas pushing the first plug body 72 or the second plug body 73 will not act on the middle part 71 of the piston, so that the sealing of the piston working chamber is good, and the fitting part of the ball and the spiral groove does not need to be in a completely closed state, which reduces the processing difficulty.

[0030] This embodiment does not include a pressure balancing air path 74 that runs axially through the middle portion 71 of the piston. The pressure balancing air path 74 is located on the outer ring of the first plug body 72, so that the pressure at both ends of the middle portion 71 of the piston is balanced during movement, so that the piston portion 7 runs smoothly.

[0031] When the inner knife core 5 is required to perform reciprocating linear motion, the ball can be matched with the linear raceway located on the inner wall of the piston cavity. If necessary, the spiral groove and the linear raceway can exist at the same time. The driving form is selected according to needs during the combined installation.

[0032] In this embodiment, the blocking portion 9 is fixedly installed in the rear end handle portion 1 by means of threads or a pressure cap, and the inner end of the blocking portion 9 abuts against the step surface of the rear end handle portion 1 to limit the extreme installation position of the blocking portion 9.

[0033] In this application, when the outer diameter of the core barrel 6 does not change, but the size of the inner blade core 5 and the outer blade sleeve 4 needs to be reduced, a variable diameter inner blade core 5 can be selected to ensure that the inner blade core 5 is connected to the core barrel 6. At the same time, a front end portion 2 with a matching inner diameter and a corresponding blade sleeve connecting seat 3 with an outer blade sleeve 4 of corresponding specifications can be selected to meet the needs of different patients.

[0034] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will appreciate that various modifications and variations of the present embodiment are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A vitreous cutting head for ophthalmic vitrectomy, characterized in that: The invention comprises a rear end handle portion (1), a front end portion (2) and a knife sleeve connecting seat (3) which are detachably connected in sequence, wherein the front end portion (2) is formed by splicing two half shell portions, the knife sleeve connecting seat (3) is connected to an outer knife sleeve (4), the rear end of the rear end handle portion (1) has an opening extending to a mounting cavity (12) on the end surface, a blocking portion (9) detachably installed in the mounting cavity (12) forms a piston cavity in the mounting cavity (12), and a piston portion (7) matched with the piston cavity is connected to the core barrel through two elastic retaining rings (8). (6) are connected as a whole, one end of the core tube (6) extends outward through the blocking portion (9), the other end of the core tube (6) extends into the front end portion (2) through the rear end handle portion (1), the inner knife core (5) connected to the core tube (6) passes through the front end portion (2) and extends into the outer knife sleeve (4), the rear end handle portion (1) is provided with a knife return air path (11) connected to one end of the piston chamber, and the blocking portion (9) is provided with a knife feed air path (91) connected to the other end of the piston chamber.

2. The vitrectomy head for ophthalmic vitrectomy according to claim 1, characterized in that: The core barrel (6) has at least two axially extending matching grooves (61) at the corresponding ends thereof, and the matching block (51) located at the end of the inner blade core (5) can slide into the corresponding matching grooves (61). The nut (10) connected to the core barrel (6) abuts against the matching block (51), so that the core barrel (6) and the inner blade core (5) can be detachably connected.

3. The vitrectomy head for ophthalmic vitrectomy according to claim 1, characterized in that: A vent groove (41) capable of extending to the cutting edge is provided on the outer side surface of the outer blade sleeve (4).

4. The vitrectomy head for ophthalmic vitrectomy according to claim 1, characterized in that: The piston portion (7) includes a piston middle portion (71) and a first plug body (72) and a second plug body (73) with the same diameter respectively arranged at both ends of the piston middle portion (71). The diameter of the piston middle portion (71) is larger than the diameter of the first plug body (72). The first plug body (72) is slidably engaged with a matching cavity arranged on the blocking portion (9). At least one ball is provided on the outer peripheral surface of the piston middle portion (71). The inner wall of the piston cavity has a spiral groove engaged with the ball. The piston portion (7) rotates synchronously with the core barrel (6).

5. The vitrectomy head for ophthalmic vitrectomy according to claim 4, characterized in that: A pressure balancing air path (74) is provided on the middle portion (71) of the piston and runs through the piston in the axial direction. The pressure balancing air path (74) is located on the outer ring of the first plug body (72).

6. The vitrectomy head for ophthalmic vitrectomy according to claim 2, characterized in that: The connection point between the core barrel (6) and the inner blade core (5) is located in the accommodating cavity (21) of the front end portion (2), and the front end portion (2) is provided with a through hole (13) for connecting the accommodating cavity (21) with the outside.

7. The vitrectomy head for ophthalmic vitrectomy according to claim 1, characterized in that: The front end portion (2) is connected to the rear end handle portion (1) via an elastic clamping arm and a bayonet fitting structure, and the knife sleeve connecting seat (3) is connected to the front end portion (2) via an elastic clamping arm and a bayonet fitting structure.

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