Mechanical kernel breaking push-pull handle

Abstract

The utility model relates to a mechanical kernel breaking push-pull handle, which comprises a pocket knife fixing part, a push-pull rod and a handle part, the pocket knife fixing part comprises a conduit, a clamping seat and a pre-tightening ring, the handle part comprises a front handle piece and a rear handle piece, the front end of the push-pull rod is fixedly connected with a pocket knife through the pocket knife fixing part, and the front end of the rear handle piece is quickly clamped with the rear end of the front handle piece. The push-pull rod controls the pocket knife to penetrate through the first inner hole of the front handle piece through the pocket knife fixing part, and the net-bag-shaped knife is reserved on the outer side of the front end of the front handle piece. A strip-shaped groove hole is axially formed in one side of the rear handle piece, a stand column is arranged at the upper end of the push-pull rod, the upper end of the stand column penetrates through the strip-shaped groove hole, then a push-pull cap is installed at the upper end of the stand column, and the push-pull cap is located on the outer side of the rear handle piece in a sliding mode. The push-pull device has the advantages of ingenious design and reasonable and compact structure, the rear handle piece is held by a single hand, the push-pull cap is controlled by fingers to drive the stand column to push the push-pull rod to slide back and forth in the rear handle piece, and the push rod moves back and forth.

Description

Technical Field

[0001] This utility model relates to the field of medical devices for cataract fragmentation, specifically to a mechanical fragmentation push-pull handle. Background Technology

[0002] Currently, cataract surgery involves pulverizing the eye's lens, removing the pulverized lens, and then replacing it with an artificial lens to treat cataracts.

[0003] To pulverize the lens, our company has developed a shovel-shaped blade. This blade pulverizes the lens through a combination of manual operation and purely mechanical methods. Currently available nucleus fragmentation instruments use push handles that can easily insert the shovel into the eyeball. However, when pulverizing the lens, the shovel needs to be pulled back. The push handle provides a high pull force to ensure that the shovel contracts at the opening of the support tube or support ring, squeezing the lens out of the shovel for pulverization. However, push handles on the market rarely provide this pull force. The shovel is made of shape memory titanium alloy with a metal ring and two metal connecting pieces extending from the rear end of the metal ring. A mesh-like blade is installed on the metal ring.

[0004] Currently, the metal connector is fixed to the push handle by adhesive, which has two problems: first, the tensile strength is insufficient; second, the mesh-shaped knife needs to be inserted into the eyeball for surgical operation, and medical adhesive cannot guarantee absolute safety, so the adhesive method cannot be used.

[0005] Currently, another option is to use a metal push handle. However, the high-temperature laser welding of the titanium alloy metal connecting piece requires a temperature of over 3000 degrees Celsius. The mesh made of organic molecules installed on the metal ring cannot withstand the high temperature and is easily damaged, so the metal welding method cannot meet the requirements.

[0006] Furthermore, the metal connecting pieces are very small and cannot be connected by threads because they are not strong enough to rotate.

[0007] Currently, there is a need to develop a push-pull handle that can effectively deliver the net-shaped blade and subsequently provide high-strength, high-safety control for pulling the net-shaped blade back. Utility Model Content

[0008] To solve the above-mentioned technical problems, this utility model proposes a mechanical crushing push-pull handle, which is ingeniously designed and has a reasonable and compact structure, enabling the net-shaped blade to be quickly and safely connected to the handle, meeting the requirements of high-strength pullback.

[0009] The technical solution of this utility model:

[0010] A mechanical push-pull handle for crushing kernels includes a blade fixing part, a push-pull rod, and a handle part. The blade includes a metal ring, metal connecting pieces, and a net-shaped blade. The net-shaped blade edge is mounted around the metal ring, and two metal connecting pieces are connected to one side of the metal ring. The blade fixing part includes a guide tube, a retaining seat, and a pre-tightening ring. The rear end of the guide tube is fixed to the retaining seat and the guide tube communicates with the rear end of the retaining seat. An annular step is designed on the outer side of the rear end of the retaining seat. The lower ends of the two metal connecting pieces of the blade pass through the inside of the guide tube and the retaining seat, and the lower ends of the two metal connecting pieces are folded outward and upward to form bent edges. The two bent edges are attached to the outer side of the annular step. The pre-tightening ring is fitted onto the outer side of the annular step and presses the two bent edges tightly against the outer side of the annular step. The front end of the push-pull rod is designed with a slot for the retaining seat to engage.

[0011] The handle includes a front handle and a rear handle. The front handle has a first inner hole in the middle for guiding the sling and the guide tube. The rear handle also has a second inner hole in the middle for sliding the push-pull rod. The push-pull rod is slidably installed in the rear handle. The front end of the push-pull rod is fixedly connected to the sling through the sling fixing part. The front end of the rear handle quickly engages with the rear end of the front handle. The push-pull rod controls the sling to pass through the first inner hole of the front handle through the sling fixing part, and the net-shaped sling is reserved on the outer side of the front end of the front handle. A strip-shaped slot is axially opened on one side of the rear handle. A column is provided at the upper end of the push-pull rod. The upper end of the column passes through the strip-shaped slot and a push-pull cap is installed at its upper end. The push-pull cap is slidably located on the outer side of the rear handle.

[0012] The rear end of the strip-shaped slot of the rear handle is connected to the rear end of the rear handle, and an end cap is installed at the rear end of the rear handle, which blocks the rear end of the second inner hole and the strip-shaped slot.

[0013] The end cap has an annular groove on its inner side, and the rear end of the handle has an annular step. An annular protrusion is designed on the outer side of the annular step. The inner side of the end cap is fastened to the outer side of the annular step at the rear end of the handle, and the annular groove is engaged with the outer side of the annular protrusion.

[0014] The lower end of the conduit passes through the middle of the card seat to form an annular step, and the conduit and the card seat are fixedly connected; the conduit is sleeved on the outside of the metal connecting piece, and the front end of the conduit is located near the metal ring.

[0015] The push-pull rod has a slide bar on each side, and the second inner hole of the rear handle has corresponding grooves on both sides. The push-pull rod is slidably installed in the groove of the rear handle through the slide bar. The slot is designed as a U-shaped slot, and the inner sides of the U-shaped slot opening are respectively designed with counter-teeth. The upper end of the slot seat is also provided with a rectangular protrusion. The head of the rectangular protrusion is designed with a chamfer. The slot seat is located in the slot and the rectangular protrusion is locked in the U-shaped slot. The counter-teeth on the inner side of the U-shaped slot are blocked on both sides of the tail of the rectangular protrusion.

[0016] The front handle has a locking block on each of its two rear ends, and the rear handle has a locking slot on each of its two front ends. The locking blocks are positioned by locking into the locking slots.

[0017] The front handle has a plug near the rear end on one side, with a dovetail groove on each side and a slot in the middle. The rear handle has a plate on one side of the front end, with a strip on the inner side of the plate and dovetail blocks protruding inward on both sides of the inner side. The plate is inserted into the slot of the plate via the strip and slides into the dovetail grooves on both sides of the plate via the dovetail blocks. The dovetail groove has two recesses in the middle, and the dovetail blocks have two protrusions in the middle. The front ends of the dovetail blocks and the front ends of the two protrusions are chamfered. The two protrusions are positioned and fitted within the two recesses.

[0018] The first inner hole of the front handle is designed as a flattened round conical hole. The diameter of the first inner hole is larger near the rear end and smaller away from the rear end. The overall shape of the front handle is also designed as a flattened round conical body.

[0019] The front handle has several protrusions on both sides; the rear handle also has several stripes on its outer side.

[0020] The front end of the front handle is also designed with a support tube. The inner hole of the support tube is connected to the first inner hole, and the opening of the support tube is designed as an inclined opening. The inner hole of the support tube is also designed as a conical hole with a large opening diameter, while the opening diameter is small near the first inner hole of the front handle.

[0021] The advantages of this utility model are its ingenious design and reasonable and compact structure. This utility model can realize the back handle part by one hand, and the finger controls the push-pull cap to push the push-pull rod to slide back and forth in the back handle part with the column, so as to realize the back and forth movement of the push rod.

[0022] Secondly, the metal connecting piece of the net-shaped blade is pre-fixed through the blade fixing part to form a primary snap-fit. Then, the blade fixing part is further snapped into the front slot of the push-pull rod. When the front end of the push-pull rod is pulled back, it remains within the second inner hole of the rear handle, forming a tertiary snap-fit. This method involves no adhesive, welding, or threaded connection, ensuring a high-strength connection between the tail end of the net-shaped blade and the push-pull rod, meeting the requirements of subsequent strong pull-back surgical operations. The tail end of the push-pull rod is snapped into the rear end of the movable part by a flexible mushroom-shaped snap-fit ​​head. A washer is installed between the mushroom-shaped snap-fit ​​heads to prevent the snap-fit ​​heads from retracting and disengaging under pressure. To further improve tensile strength, a metal pin connects the washer to the snap-fit ​​head, effectively securing the snap-fit ​​head to the rear end of the movable part. The front and rear handles are snapped together for a quick and effective connection. The push rod and the rear handle slide together via a sliding groove, ensuring stable operation of the push rod, and the rear handle effectively clamps the front end of the push rod to ensure stability during pull-back. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the present invention.

[0024] Figure 2 This is a vertical sectional view of the present invention.

[0025] Figure 3 This is a cross-sectional view of the present invention.

[0026] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0027] Figure 5 This is a schematic diagram of the connection between the front handle and the rear handle of this utility model.

[0028] Figure 6 This is a schematic diagram of the rear handle component of this utility model.

[0029] Figure 7 This is a schematic diagram of the front handle of this utility model.

[0030] Figure 8 This is a schematic diagram of the push-pull rod of this utility model connected to the blade via the blade fixing part.

[0031] Figure 9 This is a schematic diagram of the rear end of the blade fixing part of this utility model connected to the blade. Detailed Implementation

[0032] See attached document Figure 1-9A mechanical push-pull handle for crushing kernels includes a blade fixing part 1, a push-pull rod 2, and a handle part 3. The blade 4 includes a metal ring 41, metal connecting pieces 42, and a net-shaped blade 43. The opening of the net-shaped blade 43 is mounted on the metal ring 41, and two metal connecting pieces 42 are connected to one side of the metal ring 41. The blade fixing part 1 includes a guide tube 11, a retaining seat 12, and a pre-tightening ring 13. The rear end of the guide tube 11 is fixed to the retaining seat 12 and the guide tube 11 communicates with the rear end of the retaining seat 12. An annular step 14 is designed on the outer side of the rear end of the retaining seat 12. The lower ends of the two metal connecting pieces 42 of the blade 4 pass through the inside of the guide tube 11 and the retaining seat 12, and the lower ends of the two metal connecting pieces 42 are folded outward and upward to form bent edges 421. The two bent edges 421 are attached to the outer side of the annular step 14. The pre-tightening ring 13 is fitted on the outer side of the annular step 14 and presses the two bent edges 421 tightly against the annular step 14. The outer side; the front end of the push-pull rod 2 is designed with a slot 21 for the card seat 12 to be inserted. The handle part 3 includes a front handle part 31 and a rear handle part 32. The front handle part 31 has a first inner hole in the middle for the pocket knife 4 and the guide tube 11 to be guided. The rear handle part 32 also has a second inner hole in the middle for the push-pull rod 2 to slide back and forth. The push-pull rod 2 is slidably installed in the rear handle part 32. The front end of the push-pull rod 2 is fixedly connected to the pocket knife 4 through the pocket knife fixing part 1. The front end of the rear handle part 32 is quickly engaged with the rear end of the front handle part 31. The push-pull rod 2 controls the pocket knife 4 to pass through the first inner hole of the front handle part 31 through the pocket knife fixing part 1, and the net-shaped knife 43 is reserved on the outer side of the front end of the front handle part 31. A strip-shaped slot 33 is axially opened on one side of the rear handle part 32. A column 30 is provided at the upper end of the push-pull rod 2. After the upper end of the column 30 passes through the strip-shaped slot 33, a push-pull cap 5 is installed at its upper end. The push-pull cap 5 is slidably located on the outer side of the rear handle part 32. The lower end of the push-pull cap is designed with an arc shape, which matches the outer side of the rear handle for easy sliding. The rear handle can be designed in one of the following shapes: cylindrical, elliptical, hexagonal, or octagonal, for ease of operation.

[0033] The rear end of the strip-shaped slot 33 of the rear handle 32 is connected to the rear end of the rear handle 32. An end cap 6 is installed at the rear end of the rear handle 32, and the end cap 6 blocks the rear end of the second inner hole and the strip-shaped slot 33.

[0034] The end cap 6 has an annular groove 61 on its inner side, and the rear end of the rear handle 32 has an annular step. An annular protrusion is designed on the outer side of the annular step. The inner side of the end cap engages with the outer side of the annular step at the rear end of the rear handle, and the annular groove 61 engages with the outer side of the annular protrusion. The end cap is designed to seal the rear end of the rear handle, preventing the push-pull rod from slipping out of the rear handle. Furthermore, once the end cap is removed, the push-pull rod's upright can be easily slidably installed into the slotted hole, facilitating assembly.

[0035] The lower end of the conduit 11 passes through the middle of the retainer 12 to form an annular step 14, and the conduit 11 is fixedly connected to the retainer 12. The conduit 11 is fitted over the outside of the metal connecting piece, and the front end of the conduit is located near the metal ring. The design of the front end of the conduit near the metal ring can effectively support the metal connecting piece, giving it a certain support strength and preventing it from becoming "weak," thus ensuring that the metal ring and the mesh retainer can effectively extend and rotate. The conduit can be made of stainless steel pipe, and the retainer can be made of plastic material, and the two are connected as one piece by injection molding. Alternatively, both the conduit and the retainer can be made of plastic material and integrally injection molded.

[0036] The slot 21 is designed as a U-shaped groove, with chamfered teeth 211 on both sides of the inner side of the U-shaped groove opening. The upper end of the card holder 12 is also provided with a rectangular protrusion 121, the head of which is chamfered. The card holder 12 is located within the slot 21, and the rectangular protrusion 121 is engaged within the U-shaped groove. The chamfered teeth 211 on the inner side of the U-shaped groove block the tail sides of the rectangular protrusion 121. The chamfered teeth near the opening facilitate the engagement of the rectangular protrusion. The main body of the card holder fits perfectly into the U-shaped groove of the slot. The chamfered teeth at the upper opening of the U-shaped groove are used to lock the rectangular protrusion of the card holder, providing an anti-disengagement design and improving tensile strength. After the pre-tightening ring presses the bent edge, it also provides secondary external clamping through the U-shaped groove, ensuring safety and reliability. A circular groove may be included at the bottom of the U-shaped groove, designed to accommodate the lower end of the card holder, but this is not a necessary design.

[0037] The push-pull rod 2 is designed with a slide bar 22 on each side, and the second inner hole of the rear handle 32 is designed with corresponding slide grooves 321 on both sides. The push-pull rod 2 is slidably installed in the slide grooves 321 of the rear handle 32 through the slide bar 22.

[0038] The front handle 31 has a locking block 311 on each of its rear ends, and the rear handle 32 has a locking groove 322 on each of its front ends. The locking blocks 311 are respectively locked into the locking grooves 322 for positioning. The locking blocks and locking grooves work together to effectively prevent the front and rear handles from rotating relative to each other and to lock them in place.

[0039] The front handle 31 has a plug 312 near its rear end on one side. A dovetail groove 313 is designed on each side of the plug 312, and a slot 314 is designed in the middle of the plug 312. The rear handle 32 has a plug plate 323 on one side of its front end. A strip 324 is designed on the inner side of the plug plate 323, and two dovetail blocks 325 protruding inwards are provided on the inner sides of the plug plate 323. The plug plate 323 is inserted into the plug block via the strip 324. The insert plate 323 is slidably inserted into the dovetail grooves 313 on both sides of the insert block 312 within the slot 314 of the insert block 312 via dovetail blocks 325 on both sides. The dovetail grooves 313 also have two recessed sections 3131 in the middle, and the dovetail blocks 325 have two protrusions 3251 in the middle. The front ends of both the dovetail blocks 325 and the protrusions 3251 have guide chamfers. The protrusions 3251 are positioned within the recessed sections 3131 for positioning. The structural design of the insert block and insert plate ensures effective and rapid engagement between the front and rear handle components.

[0040] The first inner hole of the front handle 31 is designed as a flattened oval-shaped conical hole. The diameter of the first inner hole is larger near the rear end and smaller further away from the rear end. The overall shape of the front handle 31 is also designed as a flattened oval-shaped conical body. The overall flattened oval-shaped conical design of the front handle ensures that the front end is small, which is convenient for operation and has high structural strength.

[0041] The front handle 31 has several protrusions 301 on both sides; the rear handle 32 also has several stripes on its outer side. This anti-slip design facilitates force application during operation.

[0042] The front end of the front handle 31 is also designed with a support tube 302. The inner hole of the support tube 302 is connected to the first inner hole. The opening of the support tube 302 is designed as an inclined opening, and the inner hole of the support tube is also designed as a conical hole with a large opening diameter and a small opening diameter near the first inner hole of the front handle. The design of the inclined opening and the conical hole ensures that the blade can easily retract and squeeze the lens during the pull-back, and perform nucleus fragmentation, ensuring effective operation with the blade.

[0043] Both the front and rear handles of this invention are made of plastic, and the push-pull rod can also be made of plastic. In use, the rear handle is held with one hand, and the push-pull cap, along with the upright, pushes the push-pull rod forward within the rear handle, moving the push rod forward. The front end of the push-pull rod, through the blade fixing part, pushes the blade forward, inserting it into the eyeball for surgical operation. When it is necessary to pull the blade back for nucleus fragmentation, the index finger hooks the push-pull cap to control the push rod to pull back along the rear handle. The device effectively locks the scalpel's fixing part into place via a slot. The scalpel's metal connecting piece is then secured by a folded edge, followed by a pre-tightening ring that tightens it against the outer side of the scalpel's annular step. The inner wall of the push-pull rod's slot is then secured against the outer side of the pre-tightening ring for a second tightening. Finally, the outer side of the push-pull rod's slot is tightened by the second inner hole of the rear handle, creating a third tightening. This combination of folding and subsequent three tightenings effectively ensures high tensile strength between the scalpel and the push-pull rod, preventing loosening and meeting the required strength for core fragmentation pullback. This allows the operator to perform the procedure with one hand, freeing up the other hand to operate other surgical instruments and assisting in cataract surgery.

Claims

1. A mechanical push-pull handle for crushing kernels, characterized in that, It includes a blade fixing part, a push-pull rod, and a handle part. The blade includes a metal ring, a metal connecting piece, and a net-shaped blade. The net-shaped blade edge is mounted on the metal ring, and two metal connecting pieces are connected to one side of the metal ring. The blade fixing part includes a guide tube, a retaining seat, and a pre-tightening ring. The rear end of the guide tube is fixed on the retaining seat and the guide tube communicates with the rear end of the retaining seat. An annular step is designed on the outer side of the rear end of the retaining seat. The lower ends of the two metal connecting pieces of the blade pass through the inside of the guide tube and the retaining seat, and the lower ends of the two metal connecting pieces are folded outward and upward to form bent edges. The two bent edges are attached to the outer side of the annular step. The pre-tightening ring is fitted on the outer side of the annular step and presses the two bent edges tightly against the outer side of the annular step. The front end of the push-pull rod is designed with a slot for the retaining seat to engage. The handle includes a front handle and a rear handle. The front handle has a first inner hole in the middle for guiding the sling and the guide tube. The rear handle also has a second inner hole in the middle for sliding the push-pull rod. The push-pull rod is slidably installed in the rear handle. The front end of the push-pull rod is fixedly connected to the sling through the sling fixing part. The front end of the rear handle quickly engages with the rear end of the front handle. The push-pull rod controls the sling to pass through the first inner hole of the front handle through the sling fixing part, and the net-shaped sling is reserved on the outer side of the front end of the front handle. A strip-shaped slot is axially opened on one side of the rear handle. A column is provided at the upper end of the push-pull rod. The upper end of the column passes through the strip-shaped slot and a push-pull cap is installed at its upper end. The push-pull cap is slidably located on the outer side of the rear handle.

2. The mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The rear end of the strip-shaped slot of the rear handle is connected to the rear end of the rear handle, and an end cap is installed at the rear end of the rear handle, which blocks the rear end of the second inner hole and the strip-shaped slot.

3. The mechanical kernel-crushing push-pull handle according to claim 2, characterized in that, The end cap has an annular groove on its inner side, and the rear end of the handle has an annular step. An annular protrusion is designed on the outer side of the annular step. The inner side of the end cap is fastened to the outer side of the annular step at the rear end of the handle, and the annular groove is engaged with the outer side of the annular protrusion.

4. The mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The lower end of the conduit passes through the middle of the card seat to form an annular step, and the conduit and the card seat are fixedly connected; the conduit is sleeved on the outside of the metal connecting piece, and the front end of the conduit is located near the metal ring.

5. A mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The push-pull rod has a slide bar on each side, and the second inner hole of the rear handle has corresponding grooves on both sides. The push-pull rod is slidably installed in the groove of the rear handle through the slide bar. The slot is designed as a U-shaped slot, and the inner sides of the U-shaped slot opening are respectively designed with counter-teeth. The upper end of the slot seat is also provided with a rectangular protrusion. The head of the rectangular protrusion is designed with a chamfer. The slot seat is located in the slot and the rectangular protrusion is locked in the U-shaped slot. The counter-teeth on the inner side of the U-shaped slot are blocked on both sides of the tail of the rectangular protrusion.

6. A mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The front handle has a locking block on each of its two rear ends, and the rear handle has a locking slot on each of its two front ends. The locking blocks are positioned by locking into the locking slots.

7. A mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The front handle has a plug near the rear end on one side, with a dovetail groove on each side and a slot in the middle. The rear handle has a plate on one side of the front end, with a strip on the inner side of the plate and dovetail blocks protruding inward on both sides of the inner side. The plate is inserted into the slot of the plate via the strip and slides into the dovetail grooves on both sides of the plate via the dovetail blocks. The dovetail groove has two recesses in the middle, and the dovetail blocks have two protrusions in the middle. The front ends of the dovetail blocks and the front ends of the two protrusions are chamfered. The two protrusions are positioned and fitted within the two recesses.

8. A mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The first inner hole of the front handle is designed as a flattened round conical hole. The diameter of the first inner hole is larger near the rear end and smaller away from the rear end. The overall shape of the front handle is also designed as a flattened round conical body.

9. A mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The front handle has several protrusions on both sides; the rear handle also has several stripes on its outer side.

10. A mechanical kernel-crushing push-pull handle according to claim 1, characterized in that, The front end of the front handle is also designed with a support tube. The inner hole of the support tube is connected to the first inner hole, and the opening of the support tube is designed as an inclined opening. The inner hole of the support tube is also designed as a conical hole with a large opening diameter, while the opening diameter is small near the first inner hole of the front handle.

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