Easily detachable inner core assembly and surgical instrument applying same

Abstract

An inner core assembly easy to disassemble and a surgical instrument applying the same comprise an inner rod assembly and an outer tube assembly, and the outer tube assembly comprises a base and a hollow outer tube. The inner rod assembly comprises a first jaw, a second jaw, a first connecting rod, a second connecting rod, a main pin, a check ring and a driving rod. The first jaw comprises a first jaw tail; and the second jaw comprises a second jaw tail. The main pin comprises a pin head and a pin flange, the first jaw tail and the second jaw tail are mutually stacked, and the check ring and the main pin or the second jaw tail are fixed together, so that the first jaw tail and the second jaw tail are fixed between the pin flange and the check ring to form a first revolute pair capable of rotating around the main pin. The first jaw tail and the first connecting rod are matched to form a second rotating pair, and the second jaw tail and the second connecting rod are matched to form a third rotating pair. The first connecting rod and the driving rod are matched to form a fourth rotating pair, and the second connecting rod and the driving rod are matched to form a fifth rotating pair. The inner rod assembly is installed in the outer pipe assembly, and the main pin shaft and the base are matched to form a structure capable of being rapidly detached.

Description

Technical Field

[0001] The invention relates to a minimally invasive surgical instrument, and in particular to an easily detachable inner core component and a surgical instrument using the same. Background Art

[0002] Laparoscopic minimally invasive surgery uses extended laparoscopic handheld instruments to enter the patient's body through natural cavities or constructed puncture channels to complete operations such as tissue grabbing, shearing, separation, coagulation, and suturing. Compared with traditional open surgery, its main advantages are reducing trauma, alleviating pain, and accelerating recovery. So far, reusable laparoscopic handheld instruments (referred to as reusable instruments) have dominated the market, and disposable laparoscopic handheld instruments (referred to as disposable instruments) are relatively rarely used clinically. Studies have shown that reusable instruments have unreliable and uncontrollable problems in cleaning, distribution, and use, and there is no reliable solution so far. Summary of the invention

[0003] Therefore, in order to solve the problems of the prior art, a device that can be easily disassembled and washed is proposed.

[0004] In one aspect of the present invention, an easily detachable inner core assembly is provided, comprising an inner rod assembly and an outer tube assembly, wherein the outer tube assembly comprises a base and a hollow outer tube. The inner rod assembly comprises a first jaw, a second jaw, a first connecting rod, a second connecting rod, a main pin, a retaining ring and a driving rod. The proximal end of the first jaw comprises a first jaw tail and a first base hole that passes through it transversely; the proximal end of the second jaw comprises a second jaw tail and a second base hole that passes through it transversely. The main pin comprises a pin head and a pin flange, the first jaw tail and the second jaw tail are stacked on each other, the main pin passes through the first base hole and the second base hole, and the retaining ring is fixed together with the main pin or the second jaw tail, so that the first and second jaw tails are fixed between the pin flange and the retaining ring to form a first rotation pair that can rotate around the main pin. The first jaw tail and the first connecting rod match to form a second rotation pair, the second jaw tail and the second connecting rod match to form a third rotation pair, the first connecting rod and the driving rod match to form a fourth rotation pair, and the second connecting rod and the driving rod match to form a fifth rotation pair. By moving the driving rod, the first, second, third, fourth and fifth rotation pairs can rotate simultaneously. The inner rod assembly is installed in the outer tube assembly, wherein the main pin shaft matches with the base to form a quickly detachable structure.

[0005] In one solution, the kingpin includes a first pin head, a second pin head and a pin flange disposed therebetween, the second pin head includes a pin ring groove, and the retaining ring includes a retaining ring hole defined by an annular sheet and having a shape and size matching the pin ring groove. The first jaw tail and the second jaw tail are stacked on each other, the second pin head passes through the first base hole and the second base hole, and the retaining ring is fixed in the pin ring groove, fixing the first and second jaw tails together and forming a first rotating pair that can rotate around the kingpin.

[0006] In another embodiment, the retaining ring further comprises a retaining ring opening, and the annular sheet of the retaining ring is welded to the first jaw tail or the second jaw tail.

[0007] In another embodiment, the first connecting rod comprises a first connecting rod head and a first connecting rod tail and a first connecting rod body extending therebetween, the first connecting rod head comprises a first connecting rod shaft extending laterally outward, and the first connecting rod tail comprises a first connecting rod hole extending laterally therethrough. The second connecting rod comprises a second connecting rod head and a second connecting rod tail and a second connecting rod body extending therebetween, the second connecting rod head comprises a second connecting rod shaft extending laterally outward, and the second connecting rod tail comprises a second connecting rod hole extending laterally therethrough. The proximal end of the first jaw tail comprises a first tail hole, and the first tail hole is fixed together with the first connecting rod shaft to form a second rotation pair; the proximal end of the second jaw tail comprises a second tail hole, and the second tail hole is fixed together with the second connecting rod shaft to form a third rotation pair.

[0008] In another embodiment, the end face of the first connecting rod shaft includes a first blind hole defined by a first shaft wall, and after the first connecting rod shaft penetrates the first tail hole, the first shaft wall is deformed outward to form a first curling edge, and the first curling edge restricts the separation of the second rotation pair. The end face of the second connecting rod shaft includes a second blind hole defined by a second shaft wall, and after the second connecting rod shaft penetrates the second tail hole, the second shaft wall is deformed outward to form a second curling edge, and the second curling edge restricts the separation of the third rotation pair.

[0009] In another embodiment, the driving rod includes a driving head, and the driving head includes a first driving shaft and a second driving shaft extending outward; the end face of the first driving shaft includes a third shaft wall, and the end face of the second driving shaft includes a fourth shaft wall. After the first driving shaft penetrates the first connecting rod hole, the third shaft wall is deformed outward to form a third curling edge to limit the separation of the fourth rotation pair; after the second driving shaft penetrates the second connecting rod hole, the fourth shaft wall is deformed outward to form a fourth curling edge to limit the separation of the fifth rotation pair.

[0010] In another embodiment, the base includes a first longitudinal reference plane and a second longitudinal reference plane perpendicular to each other and an intersecting main axis. The base also includes a base tail and a first main arm and a second main arm extending to the distal end. The first and second main arms are arranged on both sides of the first longitudinal reference plane, and the two define a U-shaped groove. The base also includes a first special-shaped groove and a second special-shaped groove. The first special-shaped groove extends from the distal end to the proximal end of the first main arm along the second longitudinal reference plane and divides it into a first elastic arm and a second elastic arm; the second special-shaped groove extends from the distal end to the proximal end of the second main arm along the second longitudinal reference plane and divides it into a third elastic arm and a fourth elastic arm. The pin head at one end of the kingpin is stuck in the first special-shaped groove between the first elastic arm and the second elastic arm to form a first bite pair, and the pin head at the other end of the kingpin is stuck in the second special-shaped groove between the second elastic arm and the third elastic arm to form a second bite pair. By moving the driving rod from the distal end to the proximal end, the pin head at one end of the main pin can slide into the first special-shaped groove to form the first bite pair, and the pin head at the other end of the main pin can slide into the second special-shaped groove to form the second bite pair. By moving the driving rod from the proximal end to the distal end, the pin head at one end of the main pin can slide out of the first special-shaped groove to separate the first bite pair, and the pin head at the other end of the main pin can slide out of the second special-shaped groove to separate the second bite pair.

[0011] In another embodiment, the first special-shaped groove includes a distal first guide opening, a first cylindrical surface and a first cutting groove, the maximum opening width of the first guide opening is H11, the diameter of the first cylindrical surface is D11, the first guide opening and the first cylindrical surface intersect to form a first bite with an opening width of H12, wherein H11≥D11>H12. The second special-shaped groove includes a distal second guide opening, a second cylindrical surface and a second cutting groove, the maximum opening width of the second guide opening is H21, the diameter of the second cylindrical surface is D21, the second guide opening and the second cylindrical surface intersect to form a second bite with an opening width of H22, wherein H21≥D21>H22. The pin head at one end of the kingpin is embedded in the first cylindrical surface to form a first bite pair, and the pin head at the other end of the kingpin is embedded in the second cylindrical surface to form a second bite pair.

[0012] In another embodiment, the inner core component includes three states: working state, critical state and separation state, and the corresponding drive head includes working displacement Lw1 and critical displacement Le1, wherein Lw1>Le1. Working state: when the drive head is in the working displacement Lw1, the pin head of the kingpin keeps in contact with the first and second cylindrical surfaces, that is, the first and second bite pairs are in the bite state; moving the drive rod can make the first and second jaws close or open within the angle range of 0~A1. Critical state: when the drive head is in the critical displacement Le1, the drive rod continues to move from the proximal end to the distal end. At this time, the opening angle of the first and second jaws reaches the maximum limit angle A1, and Le1 no longer decreases, so that the drive head pushes the first and second jaw tails toward the distal end, thereby pushing the pin head of the kingpin toward the distal end and pushing the first bite and the second bite to open. Separation state: In the critical state, the driving rod continues to move from the proximal end to the distal end, pushing the pin head of the main pin toward the distal end, completely expanding the first and second bites and sliding into the first and second guide openings, that is, the first and second bite pairs are in a failed separation state, thereby realizing the separation of the inner rod assembly and the outer tube assembly.

[0013] In another aspect of the present invention, a surgical instrument for minimally invasive surgery comprises an inner core assembly as described in any one of claims 1 to 9, and also comprises a handle assembly matching therewith; the handle assembly comprises a rotating wheel assembly, a button assembly, a handle shaft and a first handle and a second handle rotating around the inner core assembly; the outer tube assembly of the inner core assembly matches the rotating wheel assembly and the button assembly; the drive rod comprises a drive head, a drive tail and a drive rod extending therebetween, the drive tail is connected to the second handle, the first handle and the second handle rotate around the handle shaft to move the drive tail, thereby pushing the drive head to move, thereby driving the first, second, third, fourth, and fifth rotating pairs to rotate, thereby driving the first and second jaws to rotate around the first rotating pair to open or close. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more fully understand the essence of the present invention, a detailed description will be given below in conjunction with the accompanying drawings, in which: Figure 1 is a 3D schematic diagram of the device 1; Figure 2 is a 3D schematic diagram of the inner core component 3; Figure 3 is an exploded schematic diagram of the inner core component 3; Figure 4 is a cross-sectional view of the outer tube assembly 5 along its axis; Figure 5 is a schematic diagram of the projection of the base 51 on its second longitudinal reference plane 502; Figure 6 is a schematic diagram of the projection of the base 51 on its first longitudinal reference plane 501; Figure 7is a 3D schematic diagram of the base 51; Figure 8 is an exploded schematic diagram of the inner rod assembly 4; Fig. 9 is a side schematic diagram of the inner rod assembly 4; Fig.10 yes Fig. 9 10-10 cross-sectional view; Fig.11 yes Fig. 9 11-11 sectional view; Fig.12 is a partial projection view of the distal end of the inner core assembly 3; Fig.13 yes Fig.12 13-13 sectional view; Fig.14 It is a partial cross-sectional view of the inner core assembly and the handle assembly cooperating with each other; Fig.15 is a partial projection view of the distal end of yet another improved inner core; Fig.16 yes Fig.15 16-16 sectional view; Throughout the several views, the same reference numerals designate identical parts or components. DETAILED DESCRIPTION

[0015] Embodiments of the present invention are disclosed herein, however, it should be understood that the disclosed embodiments are only examples of the present invention, and the present invention can be implemented in different ways. Therefore, the contents disclosed herein are not to be interpreted as limiting, but only as the basis for the claims, and as the basis for teaching those skilled in the art how to use the present invention.

[0016] refer to Figure 1 For the convenience of description, the side close to the operator is defined as the proximal end, and the side far from the operator is defined as the distal end. When performing laparoscopic surgery, a puncture cannula assembly (not shown) is usually used to establish a surgical channel in the patient's body wall for instruments to enter and exit the patient's body. Various minimally invasive instruments, such as instrument 1, can be inserted into the body cavity through the channel formed by the cannula assembly. One or more cannula assemblies may need to be used simultaneously during the operation, and instrument 1 is also configured with one or more for simultaneous operation according to the needs of the operation.

[0017] Figure 1-Figure 4 A typical laparoscopic handheld instrument 1 is depicted, comprising a handle assembly 2 and an inner core assembly 3. The inner core assembly 3 comprises an inner rod assembly 4 and an outer tube assembly 5.

[0018] like Figure 3-Figure 7The base 51 comprises a first longitudinal reference plane 501 and a second longitudinal reference plane 502 perpendicular to each other and an intersecting main axis 503. The base 510 further comprises a base tail 505 and a first main arm 507 and a second main arm 508 extending to the far end, wherein the first and second main arms are arranged on both sides of the first longitudinal reference plane, and the two define a U-shaped groove 506; a base shaft hole 504 axially penetrates the base tail 505 and is connected to the U-shaped groove 506; and the hole axis thereof substantially coincides with the main axis.

[0019] Reference Figure 5-Figure 7 , the base 51 also includes a first special-shaped groove 510 and a second special-shaped groove 520. The first special-shaped groove 510 extends from the distal end to the proximal end of the first main arm along the second longitudinal reference plane 502 and divides it into a first elastic arm 515 and a second elastic arm 517. The second special-shaped groove 520 extends from the distal end to the proximal end of the second main arm along the second longitudinal reference plane 502 and divides it into a third elastic arm 525 and a fourth elastic arm 527. The first special-shaped groove 510 includes a distal first guide opening 511, a first cylindrical surface 512 and a first cutting groove 513. The maximum opening width of the first guide opening is H11, the diameter of the first cylindrical surface 512 is D11, and the first guide opening 511 and the first cylindrical surface 512 intersect to form a first bite 516 with an opening width of H12. In a preferred solution, H11≥D11>H12. The first cutting groove cuts through the first cylindrical surface 512 and extends toward the proximal end of the first main arm.

[0020] Similar, such as Figure 5-Figure 7 , the second special-shaped groove 520 includes a distal second guide opening 521, a second cylindrical surface 522 and a second cutting groove 523. The maximum opening width of the second guide opening is H21, the diameter of the second cylindrical surface 522 is D21, and the second guide opening 521 and the second cylindrical surface 522 intersect to form a second bite 526 with an opening width of H22. In a preferred solution, H21≥D21>H22. The second cutting groove cuts through the second cylindrical surface 522 and extends toward the proximal end of the second main arm. (H21, D21 and H22 are not marked in the figure, please refer to Figure 6 The first cylindrical surface 512 includes a first transverse axis 514, and the second cylindrical surface 522 includes a second transverse axis 524. The first and second transverse axes substantially coincide with each other and are perpendicular to the first longitudinal reference plane.

[0021] Reference Figure 3-Figure 4The hollow outer tube 55 includes an outer tube head 550 and an outer tube tail 570 and extends to an outer tube body 560 therebetween, and an axial through hole 551 penetrates the outer tube head and the outer tube tail along its axial direction. The outer tube tail also includes an outer tube annular groove 571 and an adapter 575. The base 51 and the hollow outer tube 55 can be fixed together by welding, riveting or bonding processes of multiple parts, or cut and processed from a single metal substrate. The outer tube assembly 5 can also include an insulating tube 59 mounted on its surface.

[0022] Figure 8 The exploded view of the inner rod assembly 4 is depicted. The inner rod assembly 4 comprises a first jaw 41, a second jaw 42, a first connecting rod 43, a second connecting rod 44, a main pin 45, a retaining ring 46 and a driving rod 47.

[0023] Continue to refer Figure 8 The proximal end of the first jaw 41 includes a first jaw tail 413 with a thickness of Hj1 defined by a first outer side surface 411 and a first inner side surface 412. The proximal end of the first jaw tail includes a first tail hole 414 that runs horizontally, and the distal end thereof includes a first base hole 415 that runs horizontally. The first jaw wrist 416 is connected to the first jaw tail 413 as a whole and extends to the distal end to form a first jaw head 419. The proximal end of the second jaw 42 includes a second jaw tail 423 with a thickness of Hj2 defined by a second outer side surface 421 and a second inner side surface 422. The proximal end of the second jaw tail includes a second tail hole 424 that runs horizontally, and the distal end thereof includes a second base hole 425 that runs horizontally. The second jaw wrist 426 is connected to the second jaw tail 423 as a whole and extends to the distal end to form a second jaw head 429.

[0024] Continue to refer Figure 8 The first connecting rod 43 includes a first connecting rod head 431 and a first connecting rod tail 433 and a first connecting rod body 432 extending therebetween; the first connecting rod head 431 includes a first connecting rod shaft 435 extending laterally outward, and the first connecting rod tail 433 includes a first connecting rod hole 437 extending laterally therethrough. The second connecting rod 44 includes a second connecting rod head 441 and a second connecting rod tail 443 and a second connecting rod body 442 extending therebetween; the second connecting rod head 441 includes a second connecting rod shaft 445 extending laterally outward, and the second connecting rod tail 443 includes a second connecting rod hole 447 extending laterally therethrough. The main pin 45 includes a first pin head 451, a second pin head 455 and a pin flange 453 disposed therebetween, and the diameter of the pin flange 453 is larger than that of the first pin head (second pin head). The retaining ring 46 includes a retaining ring hole 465 defined by an annular sheet 461.

[0025] Now combined Figure 3 and Figure 8The driving rod 47 comprises a driving head 471, a driving tail 479 and a driving rod 477 extending therebetween. The driving head 471 comprises a first driving shaft 473 and a second driving shaft 475 extending laterally outward. The driving tail 479 comprises a driving rod annular groove 478.

[0026] Figure 3 , Figure 8-Figure 11 The structural composition and assembly relationship of the inner rod assembly 4 are described in more detail. The first jaw tail 413 and the second jaw tail 423 are stacked on each other; the second pin head 455 passes through the first base hole 415 and the second base hole 425; the retaining ring 46 is fixed to the adjacent area of ​​the end of the second pin head 455, fixing the first and second jaw tails together to form a first rotation pair that can rotate around the main pin 45. The first connecting rod shaft 435 penetrates the first tail hole 414, fixing the first connecting rod head 431 and the first jaw tail 413 together to form a second rotation pair that can rotate around the first connecting rod shaft 435. The second connecting rod shaft 445 penetrates the second tail hole 424, fixing the second connecting rod head 441 and the second jaw tail 423 together to form a third rotation pair that can rotate around the second connecting rod shaft 445. The first drive shaft 473 penetrates the first connecting rod hole 437, fixing the first connecting rod tail 433 and the drive head 471 together to form a fourth rotation pair that can rotate around the first drive shaft 473. The second driving shaft 475 penetrates the second connecting rod hole 447, fixes the second connecting rod tail 443 and the driving head 471 together and forms a fifth rotation pair that can rotate around the second driving shaft 475. Pulling the driving rod 47, the first, second, third, fourth and fifth rotation pairs can rotate simultaneously.

[0027] Figure 2 , Figure 12-13 The assembly relationship of the inner core assembly 3 is described in more detail. The driving rod 47 is installed in the axial through hole 551 of the outer tube assembly; the first and second jaw tails and the first and second connecting rods are installed in the U-shaped groove 506; the first pin head 451 is embedded in the second cylindrical surface 522 to form a first bite pair; the second pin head 455 is embedded in the first cylindrical surface 512 to form a second bite pair. The first and second bite pairs support and fix the two ends of the main pin shaft. When the driving head 471 is moved, the first and second connecting rods are driven to move and rotate, driving the first and second jaw tails to rotate, thereby realizing the closing or opening of the first and second jaws.

[0028] Now combined Figure 1 , Figure 2 , Figure 4 and Fig.14The handle assembly 2 includes a first handle 92 and a second handle 93 connected to a handle shaft 91, and the first handle and the second handle can rotate around the handle shaft. The rotating wheel assembly 95 includes a rotating wheel 951, an outer sleeve 953 and an inner sleeve 955, the outer sleeve 953 is connected to the rotating wheel 951 as a whole, the inner sleeve 955 is connected to the first handle 92 as a whole, and the outer sleeve 953 and the inner sleeve 955 constitute a rotating mechanism so that the rotating wheel 951 can rotate relative to the first handle. The button assembly 97 is installed in the button installation chamber 98 of the first handle 92. The button assembly 97 includes a locking member 972, one end of the locking member 972 is connected to the elastic element 971 and the other end is connected to the button 974, the fastener 973 restricts the locking member 972 in the installation chamber 98, and the elastic element 971 drives the locking member 972 to move laterally in the installation chamber 98 to a locked position. The handheld instrument 1 includes a handle assembly 2 and an inner core assembly 3. The driving tail 479 matches the second handle 93, the elastic element 971 drives the lock 972 to move laterally in the installation bin 98 to the locking position and matches the limiting groove 48, and the connecting head 575 matches the rotating wheel 951 and transmits the rotation torque to the inner core assembly by the rotating wheel. The first handle and the second handle rotate around the handle shaft, thereby pushing the driving tail 479 to move axially, and then pushing the driving head to move axially, and then driving the first and second connecting rods to move and rotate, driving the first and second jaw tails to rotate, and realizing the closing or opening of the first and second jaws. Pressing the button 97 compresses the elastic element 971 to make the lock 972 move laterally away from the locking position, so that the limiting groove 48 is separated from the lock 972, thereby separating the inner core assembly 3 and the handle assembly 2.

[0029] Combination Figure 1-Figure 3 and Figure 9-Figure 14 It is understood that in a preferred design scheme, the inner core component 3 includes three states: working state, critical state and separation state, and the corresponding drive head 70 includes working displacement Lw1, critical displacement Le1 (displacement measurement method: the shortest distance between the first drive shaft axis and the main pin axis), where Lw1>Le1.

[0030] Working state: When the drive head is in the working displacement Lw1, the first pin head keeps in contact with the second cylindrical surface, that is, the first occlusal pair is in the occlusal state; the second pin head keeps in contact with the first cylindrical surface, that is, the second occlusal pair is in the occlusal state. In the working state, the first handle and the second handle can be operated to drive the first and second jaws to close or open within the angle range of 0~A1. Usually A1 is designed to be 65~85°.

[0031] Critical state: when the driving head is in the critical displacement Le1, continue to operate the first handle and the second handle to move away from each other, so that the driving head moves in the direction of reducing the distance between the axis of the first driving shaft and the axis of the main pin. At this time, the opening angle of the first and second jaws reaches the maximum limit angle A1, and Le1 no longer decreases; continue to operate the first handle and the second handle to move away from each other. At this time, the driving head pushes the first and second jaw tails toward the distal end, and then pushes the first and second pin heads toward the distal end and pushes the first bite and the second bite to open.

[0032] Separation state: In the critical state, continue to operate the first handle and the second handle to move away from each other; push the first and second pin heads toward the distal end; fully expand the first and second bites and slide into the first and second guide openings; that is, the first and second bite pairs are in a failed separation state; thereby achieving the separation of the inner rod assembly and the outer tube assembly.

[0033] Those skilled in the art should be able to imagine that, according to the actual needs of the surgical instrument, the size and shape of the first and second connecting rods, the first and second jaw tails and the drive head can be adjusted to adjust the specific value of Le1. An additional limiting mechanism can be added so that the displacement of the drive head is limited to the working displacement Lw1>Le1 during use of the instrument 1 to prevent it from falling out during use.

[0034] In another embodiment, the inner core assembly 3 has no obvious critical state, that is, the operating force causes the first handle and the second handle to move away from each other, and cannot push the first and second pin heads to fully expand and form the first and second bites. Those skilled in the art should be able to understand that auxiliary tools can be used to push or pull the inner rod assembly and the outer tube assembly to separate from each other, thereby pushing the first and second pin heads to move toward the distal end; fully expand and form the first and second bites and slide into the first and second guide openings; that is, the first and second bite pairs are in a failed separation state; thereby achieving the separation of the inner rod assembly and the outer tube assembly.

[0035] The reassembly of the inner rod assembly and the outer tube assembly is the reverse operation of the disassembly action: operate the first handle and the second handle to close each other, pull the first and second pin heads to move toward the proximal end through the first and second guide openings; fully expand the first and second bites and insert them into the first and second cylindrical surfaces; that is, the first pin head keeps in contact with the second cylindrical surface, that is, the first bite pair is in a bite state; the second pin head keeps in contact with the first cylindrical surface, that is, the second bite pair is in a bite state; thereby realizing the reassembly of the inner rod assembly and the outer tube assembly. Similarly, auxiliary tools can also be used for reassembly.

[0036] Reusable laparoscopic handheld instruments can usually be disassembled into two parts: a handle and an inner core assembly, which can be disassembled, cleaned, reassembled and sterilized before use. The sterilization method is usually high-temperature moist heat sterilization or low-temperature plasma sterilization. However, no matter which sterilization method is used, the used instrument must first be thoroughly cleaned before it can be sterilized according to the corresponding sterilization procedure before it can be used again for surgery. During surgery, the head of the instrument needs to operate the patient's internal tissue, and the moving joints of the head instrument are prone to residual tissue residues and are difficult to clean. In order to solve this problem, the prior art discloses a solution for disassembling the inner core assembly into 2 parts or 3 parts. However, so far, the existing technology that has been disclosed and the reusable laparoscopic handheld instruments that have been commercialized are usually not removable between the first jaw, the second jaw and the base of the head. This causes the rotating joints between the first jaw, the second jaw and the base to easily retain pathological tissue or bacteria and viruses, which are extremely difficult to clean, making the sterilization process unreliable and posing a risk of cross infection. When the inner rod assembly and the outer tube assembly of the inner core assembly 3 are disassembled, the base and the first and second jaws can be separated, which effectively solves the problem that the residual tissue in the base is extremely difficult to clean. This detachable mechanism makes the head rotation pairs of the inner rod assembly more robust, and effectively increases its strength and precision while meeting the requirement of detachability.

[0037] There are many ways to fix the retaining ring 46 and the second pin head 455, including but not limited to interference fit, welding, bonding, etc. Laser welding is preferred. Considering that the main working load borne by the main pin 45 is shear load, while the working load borne by the retaining ring 46 is relatively small, an improved main pin 45a (such as Figure 15-16 ), comprising a first pin head 451, a second pin head 455a and a pin flange 453 disposed therebetween; the second pin head 455a comprises a pin ring groove 457. The retaining ring 46a comprises a retaining ring hole 465a defined by an annular sheet 461a, the shape and size of which match the pin ring groove 457; in an optional solution, the retaining ring 46a further comprises a retaining ring opening 463a to facilitate assembly.

[0038] refer to Figure 15-16 , the first jaw tail 413 and the second jaw tail 423 are stacked on each other; the second pin head 455a passes through the first base hole 415 and the second base hole 425; the retaining ring 46a is fixed in the pin ring groove 457, fixing the first and second jaw tails together and forming a first rotating pair that can rotate around the main pin 45a. In one solution, the retaining ring opening 463a can be welded to enhance the firmness of the fixation. In another solution, the annular sheet 461a can be welded to the first jaw tail 413. When the welding solution is adopted, the retaining ring 46a can be divided into 2 or more pieces for splicing to facilitate assembly. Welding the retaining ring itself or welding the retaining ring and the jaw tail without welding the main pin can reduce the impact of welding on the main pin and prevent shear fracture.

[0039] Reference Figure 9-11 , among which the main reference Fig.11 In a preferred embodiment, the end face of the first connecting rod shaft 435 includes a first blind hole 439 defined by a first shaft wall 436; during assembly, after the first connecting rod shaft 435 penetrates the first tail hole 414, a tool is used to force the first shaft wall 436 to deform outward to form a first curling edge (not shown in the figure); thereby, the first connecting rod head 431 and the first jaw tail 413 are fixed together to form a second rotation pair that can rotate around the first connecting rod shaft 435. The end face of the second connecting rod shaft 445 includes a second blind hole 449 defined by a second shaft wall 446; during assembly, after the second connecting rod shaft 445 penetrates the second tail hole 424, a tool is used to force the second shaft wall 446 to deform outward to form a second curling edge (not shown in the figure); the second connecting rod head 441 and the second jaw tail 423 are fixed together to form a third rotation pair that can rotate around the second connecting rod shaft 445.

[0040] refer to Fig.10 Similarly, the end face of the first drive shaft 473 includes a third shaft wall 472; during assembly, after the first drive shaft 473 is passed through the first connecting rod hole 437, a tool is used to force the third shaft wall 472 to deform outward to form a third curling edge (not shown in the figure); thereby, the first connecting rod tail 433 and the driving head 471 are fixed together and form a fourth rotation pair that can rotate around the first drive shaft 473. The end face of the second drive shaft 475 includes a fourth shaft wall 474; during assembly, the second drive shaft 475 is passed through the second connecting rod hole 447, and a tool is used to force the fourth shaft wall 474 to deform outward to form a fourth curling edge (not shown in the figure); thereby, the second connecting rod tail 443 and the driving head 471 are fixed together and form a fifth rotation pair that can rotate around the second drive shaft 475.

[0041] Those skilled in the art should be able to understand that the first, second, third, and fourth curling structures disclosed above can also form a tiny curling by tapping the end of the shaft without the first (second, third, fourth) shaft wall, and can still prevent the second (third, fourth, fifth) rotation pair from disengaging. The drive head 471, the first drive shaft 473, and the second drive shaft 475 disclosed above are connected as a whole, but a drive head through hole can also be set in the drive head, and an additional shaft can be riveted in the drive head through hole to form the first drive shaft and the second drive shaft. The drive head can also be clamped between the tails of the first and second connecting rods, and then an additional shaft can be passed through the first and second connecting rod holes and the drive head through hole, and then riveted together to form the fourth and fifth rotation pairs. There are more approximate alternatives that are easy to think of, which will not be repeated here.

[0042] U.S. Patents US5489290, US5947996, US6340365, US7931667, US8551077, US8926599, etc. disclose a variety of quick connection and disassembly mechanisms of inner core components and reusable handles, which can be used for the connection between the inner core component of the present invention and the reused handle with a little adaptive modification. So far, the field of minimally invasive surgical instruments has disclosed a lot of connection modes between the inner core component and the handle of minimally invasive surgical instruments, which can be used for the connection between the inner core component of the present invention and the handle with a little adaptive modification, which are not exhaustive here. Those skilled in the art should understand that the first, second, third, fourth, and fifth are not in strict order, only for the simplicity and accuracy of the description, and are easy to understand.

Claims

1. An easily detachable inner core assembly, comprising an inner rod assembly and an outer tube assembly, wherein the outer tube assembly comprises a base and a hollow outer tube, characterized in that: 1) The inner rod assembly comprises a first jaw, a second jaw, a first connecting rod, a second connecting rod, a king pin, a retaining ring and a driving rod; 2) The proximal end of the first jaw comprises a first jaw tail and a first basal hole extending transversely therethrough; the proximal end of the second jaw comprises a second jaw tail and a second basal hole extending transversely therethrough; 3) The kingpin comprises a pin head and a pin flange, the first jaw tail and the second jaw tail are stacked on each other, the kingpin passes through the first base hole and the second base hole, and the retaining ring is fixed together with the kingpin or the second jaw tail, so that the first and second jaw tails are fixed between the pin flange and the retaining ring to form a first rotating pair that can rotate around the kingpin; 4) The first jaw tail and the first connecting rod match to form a second rotation pair, and the second jaw tail and the second connecting rod match to form a third rotation pair; 5) The first connecting rod and the driving rod are matched to form a fourth rotation pair, and the second connecting rod and the driving rod are matched to form a fifth rotation pair; 6) Move the driving rod so that the first, second, third, fourth and fifth rotating pairs can rotate simultaneously; 7) The inner rod assembly is installed in the outer tube assembly, wherein the main pin matches the base to form a quickly detachable structure.

2. The inner core assembly according to claim 1, characterized in that: 1) The kingpin comprises a first pin head, a second pin head and a pin flange arranged therebetween, the second pin head comprises a pin ring groove, and the retaining ring comprises a retaining ring hole defined by an annular sheet and having a shape and size matching the pin ring groove; 2) The first jaw tail and the second jaw tail are stacked on each other, the second pin head passes through the first base hole and the second base hole, and the retaining ring is fixed in the pin ring groove, fixing the first and second jaw tails together to form a first rotating pair that can rotate around the kingpin.

3. The inner core assembly according to claim 2, characterized in that: The retaining ring further comprises a retaining ring opening, and the annular sheet of the retaining ring is welded together with the first jaw tail or the second jaw tail.

4. The inner core assembly according to claim 1, characterized in that: 1) The first connecting rod comprises a first connecting rod head and a first connecting rod tail and a first connecting rod body extending therebetween, the first connecting rod head comprises a first connecting rod shaft extending laterally outward, and the first connecting rod tail comprises a first connecting rod hole extending laterally therethrough; 2) The second connecting rod comprises a second connecting rod head and a second connecting rod tail and a second connecting rod body extending therebetween, the second connecting rod head comprises a second connecting rod shaft extending laterally outward, and the second connecting rod tail comprises a second connecting rod hole extending laterally therethrough; 3) The proximal end of the first jaw tail includes a first tail hole, which is fixed together with the first connecting rod shaft to form a second rotation pair; the proximal end of the second jaw tail includes a second tail hole, which is fixed together with the second connecting rod shaft to form a third rotation pair.

5. The inner core assembly according to claim 4, characterized in that: 1) The end surface of the first connecting rod shaft includes a first blind hole defined by a first shaft wall. After the first connecting rod shaft penetrates the first tail hole, the first shaft wall is deformed outward to form a first curling edge. The first curling edge restricts the separation of the second revolving pair. 2) The end face of the second connecting rod shaft includes a second blind hole defined by a second shaft wall. After the second connecting rod shaft penetrates the second tail hole, the second shaft wall is deformed outward to form a second curling edge. The second curling edge restricts the separation of the third revolving pair.

6. The inner core assembly according to claim 4, characterized in that: 1) The driving rod comprises a driving head, and the driving head comprises a first driving shaft and a second driving shaft extending outward; the end surface of the first driving shaft comprises a third shaft wall, and the end surface of the second driving shaft comprises a fourth shaft wall; 2) After the first drive shaft penetrates the first connecting rod hole, the third shaft wall is deformed outwards to form a third curling edge to restrict the separation of the fourth rotation pair; after the second drive shaft penetrates the second connecting rod hole, the fourth shaft wall is deformed outwards to form a fourth curling edge to restrict the separation of the fifth rotation pair.

7. The inner core assembly according to claim 1, characterized in that: 1) The base comprises a first longitudinal reference plane and a second longitudinal reference plane perpendicular to each other and an intersecting main axis, and the base further comprises a base tail and a first main arm and a second main arm extending to the distal end, the first and second main arms are arranged on both sides of the first longitudinal reference plane, and the two define a U-shaped groove; 2) The base further comprises a first special-shaped groove and a second special-shaped groove, wherein the first special-shaped groove extends from the distal end to the proximal end of the first main arm along the second longitudinal reference plane and divides the first main arm into a first elastic arm and a second elastic arm; the second special-shaped groove extends from the distal end to the proximal end of the second main arm along the second longitudinal reference plane and divides the second main arm into a third elastic arm and a fourth elastic arm; 3) The pin head at one end of the main pin is clamped in the first special-shaped groove between the first elastic arm and the second elastic arm to form a first bite pair, and the pin head at the other end of the main pin is clamped in the second special-shaped groove between the second elastic arm and the third elastic arm to form a second bite pair; 4) The driving rod is moved from the distal end to the proximal end, so that the pin head at one end of the main pin can slide into the first special-shaped groove to form a first bite pair, and at the same time, the pin head at the other end of the main pin can slide into the second special-shaped groove to form a second bite pair; 5) Move the driving rod from the proximal end to the distal end, so that the pin head at one end of the main pin can slide out of the first special-shaped groove to separate the first bite pair, and at the same time, the pin head at the other end of the main pin can slide out of the second special-shaped groove to separate the second bite pair.

8. The inner core assembly according to claim 7, characterized in that: 1) The first special-shaped groove comprises a first distal guide opening, a first cylindrical surface and a first cutting groove, the maximum opening width of the first guide opening is H11, the diameter of the first cylindrical surface is D11, and the first guide opening and the first cylindrical surface intersect to form a first bite with an opening width of H12, wherein H11≥D11>H12; 2) The second special-shaped groove comprises a distal second guide opening, a second cylindrical surface and a second cutting groove, the maximum opening width of the second guide opening is H21, the diameter of the second cylindrical surface is D21, and the second guide opening and the second cylindrical surface intersect to form a second bite with an opening width of H22, wherein H21≥D21>H22; 3) The pin head at one end of the kingpin is embedded in the first cylindrical surface to form a first bite pair, and the pin head at the other end of the kingpin is embedded in the second cylindrical surface to form a second bite pair.

9. The inner core assembly according to claim 8, characterized in that: 1) The inner core assembly includes three states: working state, critical state and separation state, and the corresponding driving head includes working displacement Lw1 and critical displacement Le1, wherein Lw1>Le1; 2) Working state: when the driving head is at the working displacement Lw1, the pin head of the main pin keeps in contact with the first and second cylindrical surfaces, that is, the first and second occlusal pairs are in the occlusal state; moving the driving rod can close or open the first and second jaws within the angle range of 0~A1; 3) Critical state: When the driving head is at the critical displacement Le1, the driving rod continues to move from the proximal end to the distal end. At this time, the opening angle of the first and second jaw heads reaches the maximum limit angle A1, and Le1 no longer decreases, so that the driving head pushes the first and second jaw tails to move toward the distal end, thereby pushing the pin head of the main pin to move toward the distal end and pushing the first bite and the second bite to open; 4) Separation state: In the critical state, the driving rod continues to move from the proximal end to the distal end, pushing the pin head of the main pin toward the distal end, completely expanding the first and second bites and sliding into the first and second guide openings, that is, the first and second bite pairs are in a failed separation state, thereby realizing the separation of the inner rod assembly and the outer tube assembly.

10. A surgical instrument for minimally invasive surgery, the instrument comprising an inner core assembly as described in any one of claims 1-9, and also comprising a handle assembly matching therewith; the handle assembly comprises a rotating wheel assembly, a button assembly, a handle shaft and a first handle and a second handle rotating around the handle; the outer tube assembly of the inner core assembly matches the rotating wheel assembly and the button assembly; the drive rod comprises a drive head, a drive tail and a drive rod extending therebetween, the drive tail is connected to the second handle, the first handle and the second handle rotate around the handle shaft to move the drive tail, thereby pushing the drive head to move, thereby driving the first, second, third, fourth, and fifth rotating pairs to rotate, thereby driving the first and second jaws to rotate around the first rotating pair to open or close.

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