Biopsy forceps, assembly tool and assembly process

Abstract

The present invention discloses a biopsy forceps, an assembly tool and an assembly process, which relate to the technical field of biopsy forceps, and include a main body and an end cap installed on one side of the main body, the end cap being provided with a PVC soft head, the main body being provided with a control slide groove, a clamping block being slidably provided in the control slide groove, a positioning tube being provided in the clamping block, a catheter being provided in the positioning tube, a steel wire being provided in the catheter, a limiting sleeve being provided in the end cap, the catheter extending into the limiting sleeve, a spring protective tube being provided in the PVC soft head, a spring hose being provided in the spring protective tube, a clamp head assembly being provided on the spring hose, the steel wire extending to the clamp head assembly, and a PTFE coating being applied to the middle section of the steel wire to improve the smoothness of opening and closing of the clamp head; the assembly process is optimized, and the cup holder and the spring hose are welded using optimized tooling to reduce the misalignment of the welding between the two, thereby improving the welding efficiency and the yield rate.

Description

Technical Field

[0001] The present invention relates to the technical field of biopsy forceps, and in particular to a biopsy forceps, an assembly tool and an assembly process. Background Art

[0002] Disposable biopsy forceps are medical tools designed for obtaining samples (biopsy) from internal tissues or organs. The 1.0-size biopsy forceps are primarily used to obtain tiny tissue samples during endoscopic examinations and are suitable for biopsy procedures in narrow or fragile areas of the digestive tract, respiratory tract, and urinary tract. Their compact size minimizes damage to surrounding tissue and improves the accuracy and safety of biopsies.

[0003] Due to the small size and complex structure of the 1.0 specification biopsy forceps, the spring hose cannot be inserted into the cup holder for welding like the 1.8, 2.4 and other specifications. The spring hose and the cup holder can only be butt-welded. Because the dimensions of the two materials cannot be completely consistent, butt welding will cause them to be misaligned, as well as internal parts, resulting in product opening and closing jams. In the past welding process, production workers would place the parts into the tooling and need to press the parts again with tools to prevent the two parts from arching. This operation is inconvenient and has a low yield rate. Summary of the Invention

[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a biopsy forceps, an assembly tool and an assembly process, which solves the problems that the existing 1.0 biopsy forceps have structural defects and are not very practical and operable.

[0005] Technical Solution

[0006] In order to solve the above problems, the technical solution provided by the present invention is:

[0007] A biopsy forceps comprises a main body and an end cap mounted on one side of the main body, the end cap being provided with a PVC soft head, the main body being provided with a control slide, a block being slidably provided in the control slide, a positioning tube being provided in the block, a catheter being provided in the positioning tube, a steel wire being provided in the catheter, a limiting sleeve being provided in the end cap, the catheter extending into the limiting sleeve, a spring protective tube being provided in the PVC soft head, a spring hose being provided in the spring protective tube, a clamp head assembly being provided on the spring hose, and the steel wire extending to the clamp head assembly.

[0008] Furthermore, a connecting protrusion is provided on the clamping block, a sliding handle is slidably provided on the main body, and a limiting hole is provided on the sliding handle to cooperate with the connecting protrusion.

[0009] Furthermore, the pliers head assembly consists of a push-pull rod, a connecting piece, a cup seat, a pliers cup, and a pin. The push-pull rod is fixedly connected to the steel wire, and the spring hose is fixedly connected to the cup seat.

[0010] Furthermore, the steel wire includes an insertion section, a diameter-reducing section, a PTFE-coated section, and an uncoated section, wherein the insertion section and the diameter-reducing section are uncoated.

[0011] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0012] Furthermore, the top surface of the push plate sliding on the push plate sliding groove is flush with the top surface of the base.

[0013] Furthermore, an adjustment plate is fixed on the push plate, and a fixing screw is also provided in the push plate sliding groove.

[0014] Furthermore, an arc-shaped groove or an arc-shaped opening is provided at the bottom of the pressing block.

[0015] Furthermore, a compression spring connected to the slider is provided in the movable slide groove.

[0016] A biopsy forceps assembly process includes the following steps: assembling the forceps head → cleaning and drying the metal parts → welding the steel wire to the push-pull rod → welding the spring hose to the cup base → welding the limit sleeve to the spring hose → crimping the steel wire to the positioning tube and the catheter → assembling the handle.

[0017] Beneficial effects

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] The technical solution provided by the present invention improves the smoothness of opening and closing of the pliers head by PTFE coating the middle section of the steel wire; optimizes the assembly process, and uses optimized tooling for welding the cup holder and the spring hose to reduce the misalignment of the welding between the two, thereby improving welding efficiency and yield rate.

[0020] At the same time, the assembly process is optimized, and the optimized tooling is used for welding the cup holder and the spring hose. The spring hose and the cup holder are squeezed by the push plate to reduce the misalignment of the welding parts of the two. The spring hose is prevented from arching by the fixing block. This can reduce the misalignment of the welding between the two and improve welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of Example 1 of the present invention;

[0022] Figure 2 This is a schematic structural diagram of a clamp head assembly according to embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the card block structure of Example 1 of the present invention;

[0024] Figure 4 Schematic cross-sectional view of embodiment 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the steel wire structure according to Example 1 of the present invention;

[0026] Figure 6 This is a detailed schematic diagram of the steel wire according to Example 1 of the present invention;

[0027] Figure 7 This is a schematic structural diagram of Example 2 of the present invention;

[0028] Figure 8 A partial top view of Example 2 of the present invention;

[0029] Figure 9 Schematic diagram of the matching of the slide groove and the core rod in embodiment 2 of the present invention. DETAILED DESCRIPTION

[0030] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] Combined with attachment Figure 1-5, a biopsy forceps, including a main body 00, a control slide 011 is provided on the main body 00, the control slide 011 is set at the center of the main body 00, and the control slide 011 is designed to penetrate on both sides, a card block 25 is slidingly provided in the control slide 011 of the main body 00, and the card block 25 is provided with a connecting protrusion 251 in the direction of penetrating on both sides of the control slide 011, a sliding handle 03 is provided on the outer sliding sleeve of the main body 00, and limiting holes 26 are provided on both sides of the sliding handle 03, and the connecting protrusion 251 on the card block 25 is inserted into the limiting hole 26, thereby fixing the card block 25 and the sliding handle 03 into an integrated structure, and the user can drive the card block 25 to move in the control slide 011 by pushing and pulling the sliding handle 03, and a limiting clip 02 is provided on the main body 00, which can limit the moving distance of the sliding handle 03, thereby preventing the forceps head of the biopsy forceps from being pulled too much.

[0033] A positioning tube 11 is provided in the block 25, and the positioning tube 11 is fixed at the center position of the block 25. A catheter 12 extending to one side is provided in the positioning tube 11, and a steel wire 09 is provided in the catheter 12. The extension direction of the catheter 12 and the steel wire 09 is the sliding direction of the block 25 toward the pliers head.

[0034] An end cap 05 is provided on one side of the main body 00 , and a handle 01 is provided on the other side of the main body 00 . The handle 01 facilitates the user to use the sliding handle 03 .

[0035] A limiting sleeve 13 is fixedly provided inside the end cap 05 , and the conduit 12 extends from the positioning tube 11 into the limiting sleeve 13 , and the steel wire in the conduit 12 passes through the limiting sleeve 13 .

[0036] The end cap 05 is provided with a PVC soft head 06 in the direction of extension of the steel wire 09, the PVC soft head 06 is provided with a spring protective tube 07, the spring protective tube 07 is provided with a spring hose 08, the spring hose 08 is wrapped around the outer layer of the steel wire 09, and the spring protective tube 07 is wrapped around the outer layer of the spring hose 08.

[0037] The spring protective tube 07 and the spring hose 08 both start from the inside of the PVC soft head 06. The spring protective tube 07 and the spring hose 08 extend from the starting end inside the PVC soft head 06 toward the extension direction of the steel wire 09. The spring hose 08 extends out of the spring protective tube 07 in the extension direction. The spring protective tube 07 is covered outside the part of the spring hose 08 located on one side of the PVC soft head 06.

[0038] The extension length of the spring hose 08 is designed accordingly according to the design and use length of the biopsy forceps. The spring hose 08 is fixed with a forceps head assembly 10 at one end away from the PVC soft head. The forceps head assembly 10 is used to perform a clamping action.

[0039] The pliers head assembly 10 consists of a push-pull rod 101, a connecting piece 102, a cup holder 103, a pliers cup 104, and a pin 105. The push-pull rod 101 is connected to the steel wire 09 in the spring hose 08, and the cup holder 103 is connected to the spring hose 08. A pliers cup 104 is provided in the cup holder 103, and the pliers cup 104 is installed on the cup holder 103 through the pin 105. The push-pull rod 101 is provided with a connecting piece 102 on one side of the pliers cup 104, and the connecting piece 102 is hinged to the end of the pliers cup 104 on the side close to the steel wire 09. The pliers cup 104 and the pin 105 form a scissors-like structure, so that the pliers cup 104 is opened and closed by pushing and pulling the push-pull rod 101 through the steel wire 09.

[0040] The main body 00 pushes the sliding handle 03 toward the direction of the pliers head assembly 10, driving the push-pull rod 101 connected to the steel wire 09 to slide in this direction, thereby opening the pliers head assembly 10; the main body pulls the sliding handle 03 backward, driving the push-pull rod 101 connected to the steel wire 09 to slide forward, thereby closing the pliers head assembly 10.

[0041] The structure of the steel wire 09 mainly consists of an insertion section 091, a reducing section 092, a PTFE-coated section 093, and an uncoated section 094. The insertion section 091 is inserted into the push-pull rod 101, and the steel wire 09 of the reducing section 092 gradually narrows. The insertion section 091 and the reducing section 092 are not coated, and the middle section of the steel wire is PTFE-coated. A heat-shrinkable PTFE tube can be optionally used, and the coating can be other coatings with lubricating or low-friction materials. The PTFE coating can improve the performance of the instrument, reduce adhesion and friction, make the sampling forceps effortless to operate, open and close more smoothly, and improve the patient's comfort and the smoothness of the surgical operation.

[0042] The PTFE coating can improve the smoothness of the wire-controlled push-pull rod 101, thereby improving the smoothness of opening and closing of the pliers head.

[0043] Example 2

[0044] Combined with attachment Figure 7-9 A biopsy forceps assembly tool is used to fix the biopsy forceps in Example 1. By fixing the spring hose 08 in Example 1 and the steel wire 09 contained in the spring hose 08, the spring hose 08 remains stable and is welded to the forceps head assembly 10.

[0045] It includes a base 14, which is provided with a push plate groove 27 recessed into the base 14, and the push plate groove 27 is distributed horizontally on the base 14. A push plate 15 is slidably provided in the push plate groove 27, and a protrusion is provided at the bottom of the push plate 15 located in the push plate groove 27. Planes of different heights are provided on the base 14, and the top surface of the push plate groove 27 is lower than the top surface of the base 14. A cutout 30 is provided on the base 14 at the position of the push plate groove 27, and the top surface of the push plate 15 sliding on the push plate groove 27 is flush with the top surface of the base 14.

[0046] The side of the push plate 15 near the cutout 30 is provided with a spring hole recessed into the push plate 15, and a compression spring 20 is installed inside the spring hole.

[0047] The base 14 is provided with a receiving hole at the cutout surface 30 corresponding to the spring hole, and the compression spring 20 is located in the spring hole and the receiving hole respectively.

[0048] The push plate 15 is provided with an adjustment plate 16 on the side away from the cutout 30 . The push plate 15 and the adjustment plate 16 are fixed by screws 21 . A fixing screw 211 is also provided in the push plate slot 27 of the base 14 . The fixing screw 211 is connected to the base 14 to limit the position of the push plate 15 .

[0049] A pressure plate 19 and a pressure plate 191 are provided on the base 14 around the push plate 15. The pressure plates 19 and 191 extend from the top surface of the base 14 to the top surface of the push plate 15, and the pressure plates 19 and 191 are respectively located at different side positions of the push plate 15. The pressure plates 19 and 191 are connected to the base 14 by fixing screws 21.

[0050] A fixing hole 28 is provided in the wall of the base 14 at the gap between the cutout surface 30 and the push plate 15. The fixing hole 28 is used to install the pliers head assembly 10. An adjusting screw 22 is connected to the tail of the fixing hole 28. The position of the pliers head assembly 10 can be adjusted by adjusting the position of the adjusting screw 22, thereby adjusting the matching welding position of the pliers head assembly 10 and the spring hose 08.

[0051] The base 14 is provided with a movable groove 171 at the cutout surface 30, and a slider 17 is slidably provided in the movable groove 171. A fixed block 24 is provided on the movable groove 171, and the slider 17 slides in the fixed block 27. The sliding direction of the slider 17 is consistent with the sliding direction of the push plate 15. A driving groove 172 is provided on the slider 17, and the driving groove 172 is inclined downward in the direction toward the push plate 15.

[0052] The pressing block 23 passes through the slot of the fixing block 24 , and core rods 18 are provided on both sides of the pressing block 23 . The core rods 18 are located in the driving slide groove 172 . A connecting push plate 151 is provided on the push plate 15 , and the connecting push plate 151 is fixed to the end face of the slider 17 facing the push plate 15 .

[0053] The core rod 18 is connected to the fixed block 24, the pressure block 23, and the slide groove 171 in the slider 17. The slider 17 is connected to the groove in the base 14. Compression springs 201 and 202 are installed between the slider 17 in the movable slide groove 171 and the inner side surface of the movable slide groove 171.

[0054] The notches on the fixing block 24 fix the pressing block 23 on all sides to prevent it from moving left and right when pushed, so that the pressing block 23 can only move up and down.

[0055] The bottom of the pressing block 23 may be provided with an inwardly sunken arc-shaped groove or an arc-shaped opening, so as to facilitate cooperation with the spring hose 08 . When the pressing block 23 abuts against the spring hose 08 , it can more fully cling to the spring hose 08 .

[0056] During use, the spring hose 08 is installed at the position of the notch 30, and the pliers head assembly 10 is installed in the fixing hole 28, and the push plate 15 is pushed to fix the spring hose 08. A notch-shaped opening for limiting the movement of the spring hose 08 can be provided on the upper side of the notch 30. Similarly, a notch-shaped opening for limiting the movement of the spring hose 08 is also provided on the side of the push plate 15 close to the notch 30. The spring hose 08 can be trapped in the arc-shaped opening formed by the notch shape of the notch 30 and the spring hose 08, thereby providing firm support and stability for the spring hose 08.

[0057] By pushing the adjustment plate 16, the push plate 151 is driven, and the push plate 151 pushes the slider 17, which moves into the fixed block 24. That is, the slider 17 slides into the groove where the compression springs 201 and 202 are located, and the compression springs 201 and 202 are compressed. Because the slider 17 is provided with a downwardly inclined driving groove 172, the driving groove 172 drives the core rod 18 to move downward, and the core rod 18 drives the pressure block 23 to move downward. The pressure block 23 presses the spring hose 08. The main purpose is to prevent the spring hose 08 from arching during operation, causing the spring hose 08 and the clamp head assembly 10 to be misaligned at the connection seam. At the same time, the push plate 15 presses the spring hose 08 and the clamp head assembly 10. The main purpose is to prevent the spring hose 08 from being misaligned at the connection seam between the spring hose 08 and the clamp head assembly 10 during operation.

[0058] Example 3

[0059] A biopsy forceps assembly process is provided, for assembling the biopsy forceps of the first embodiment using the assembly tool of the second embodiment.

[0060] The main process flow of this product is: pliers head assembly → metal parts cleaning and drying → steel wire and push-pull rod welding → spring hose and cup seat welding → limit sleeve and spring hose welding → steel wire and positioning tube, guide tube crimping → handle assembly.

[0061] Assembling the pliers head: First, assemble the connecting piece 102, the pliers cup 104, and the push-pull rod 101. Hinge the end of the pliers cup 104 to the end of the connecting piece 102, and hinge the connecting piece 102 to the push-pull rod 101. Then, insert the push-pull rod 101 into the hole of the cup base 103, and then insert the pin 105 into the holes of the cup base 103 and the pliers cup 104. After the above assembly is completed, weld the pin 105. Before welding, press the pin 105 to ensure that the pin 105 is flush with the pin hole on the cup base 103. Perform the first weld at the connection between the pin 105 and the cup base 103, rotate it 180°, and then weld the pin 105 on the other side to the cup base 103 for the second time. The welding parameters are: power of 0.3kW to 0.5kW; pulse width of 2ms, and argon shielding during welding.

[0062] Clean and dry metal parts: Place the metal parts in an ultrasonic cleaning machine filled with purified water and detergent for 10 minutes. After cleaning, remove the metal parts and place them in an oven set to 150°C for 10 minutes. Allow to cool naturally. Ensure that the initial bacterial count on the surface of the product after cleaning is ≤100 cfu / piece, and that there are no water stains, hair debris, or other impurities remaining on the surface. The biopsy forceps head assembly and wire 09 are all metal components.

[0063] Welding of the steel wire and the push-pull rod: The previously assembled pliers head assembly 10 is placed in the assembly tool of Example 2, and the insertion section 091 at the front end of the steel wire 09 is installed in the push-pull rod 101. Welding is performed at the connection between the push-pull rod 101 and the insertion section 091 at the front end of the steel wire 09. The welding position is 0.30mm away from the end of the push-pull rod 101. The welding position is selected at a position 0.30mm away from the end of the push-pull rod 101, which can reduce the impact of the welding position on the smoothness of the use of the push-pull rod. Burrs may be generated at the welding position. Welding is performed at 0.30mm at the end of the push-pull rod. When the pliers head is opened, the welding position will not enter the cup holder. The gap between the cup holder and the push-pull rod is small, and a slight burr will cause push jamming. First, weld the push-pull rod 101 and the wire 09 at the first point. Then, rotate 180° and weld the other end a second time. After the clamp assembly 10 is opened, the weld must not enter the hole in the cup holder 103 to prevent burrs from entering the inner hole of the cup holder 103 and causing jamming. Welding parameters: power 0.4kW to 0.6kW; pulse width 3ms.

[0064] Welding the spring hose and the cup seat: first, insert the uncoated section 094 at the end of the steel wire 09 into the spring hose 08, and align the middle cup seat 103 of the pliers assembly 10 with the spring hose 08. Insert the assembled pliers assembly 10 and spring hose 08 into the fixing hole 28 from the gap between the cutout 30 and the push plate 15, adjust the screw 22, so that the spring hose 08 and the middle cup seat 103 of the pliers assembly 10 are in the welding position, then push the adjustment plate 16 to drive the push plate 15 forward, compress the compression spring 20, and at the same time, the push plate 151 pushes the slider 17 backward, driving the core rod 18 to slide downward toward the slide groove 171 in the slider 17, compressing the compression springs 201 and 202. At the same time, the pressure block 23 moves downward from the notch of the fixed block 24 to press the spring hose 08 to prevent it from arching. The welding position is the connection seam between the spring hose 08 and the cup seat 103 in the clamp head assembly 10. The spring hose is rotated 90° for each welding point; 4 points are welded evenly; the welding parameters are: power is 0.3kW~0.5kW; pulse width is 2ms, and argon protection is turned on during welding to prevent the surface of the weld from blackening.

[0065] After completion, the adjustment plate 16 is released, the three compression springs 20, 201, and 202 rebound, the core rod 18 slides upward toward the slide groove 171 in the slider 17, and at the same time the pressure block 23 moves upward from the notch of the fixed block 24, the adjustment plate 16 returns to its original position, and the screw 211 fixes it to prevent the adjustment plate 16 from sliding out.

[0066] To weld the stopper sleeve to the spring hose: Place the spring hose 08 into the tooling, then thread it through the stopper sleeve 13 to a length of 8mm. Place the stopper sleeve 13 into the slot of the tooling. Adjust the machine to align the stopper sleeve 13, with the weld point 3mm from the end of the sleeve 13. Complete four welds per rotation. Welding parameters: power 0.5kW to 0.7kW; pulse width 2.5ms.

[0067] To crimp the steel wire, the positioning tube, and the conduit: First, shorten the steel wire 09 so that the end of the wire away from the clamp assembly 10 is 53mm from the stop sleeve 13. Thread the uncoated section 094 of the steel wire 09 into the conduit 12. Place the conduit 12 into the crimping pliers' stop slot until it bottoms out. Use the crimping pliers to crimp 10mm from the end of the conduit 12. With the crimping pliers in gear 1, thread the crimped conduit 12 into the positioning tube 11. Set the crimping pliers to gear 2 and adjust the distance between the stop slots so that the crimping position of the positioning tube 11 is in the middle. Place the positioning tube 11 into the crimping pliers' stop slot until it bottoms out and crimp. After crimping, thread the spring guard tube 08 from the clamp assembly 10 into the stop sleeve 13 and glue the two together.

[0068] Handle Assembly: Remove the positioning tube 11 and insert it into the clamping block 25. The stopper protrusions on both sides of the clamping block 25 snap into the sliding handle 03. Assemble the end cap 05, PVC soft head 06, sliding handle 03, and handle 01 together. Once completed, install the limit clip 02 into the handle 01. Adjust the distance between the limit clip 02 and the sliding handle 03 according to the product specifications. After adjusting the distance, secure the limit clip 02 with glue.

[0069] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A biopsy forceps assembly tool, characterized in that: The top of the push plate is flush with the top surface of the base, and the base is provided with a cutout surface at the push plate slide groove. The base is provided with a fixing hole between the cutout surface and the push plate, and an adjusting screw is provided in the fixing hole. The base is provided with a movable slide groove on the cutout surface, and a slider is provided for sliding the movable slide groove. The movable slide groove is provided with a fixing block, and the slider slides in the fixing block. The sliding direction of the slider is consistent with the sliding direction of the push plate, and the slider is provided with a driving slide groove, which drives the slide groove to tilt downward in the direction of the push plate. The adjusting plate is driven by the adjusting member, and the connecting push plate pushes the slider, and the slider moves toward the fixed block. Since the slider is provided with a downwardly inclined driving slide, the driving slide drives the core rod to move downward, thereby the core rod drives the pressure block to move downward, and the pressure block presses the spring hose.

2. The biopsy forceps assembly tool according to claim 1, characterized in that: A fixing screw is also provided in the push plate sliding groove.

3. The biopsy forceps assembly tool according to claim 1, characterized in that: The bottom of the pressing block is provided with an arc-shaped groove or an arc-shaped opening.

4. The biopsy forceps assembly tool according to claim 1, characterized in that: A compression spring connected to the slider is provided in the movable slide groove.

5. A biopsy forceps assembly process, comprising: producing the biopsy forceps using the biopsy forceps assembly tool according to any one of claims 1 to 4, wherein: The process flow is: pliers head assembly → metal parts cleaning and drying → steel wire welding to push-pull rod → spring hose welding to cup holder → limit sleeve welding to spring hose → steel wire crimping to positioning tube and conduit → handle assembly.

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