Harmonic Knife

Abstract

The present invention provides a harmonic knife with a fixing function, comprising: a chuck portion, a chuck trigger, and a fixed trigger. When the chuck operating member of the chuck trigger is pressed, the chuck portion performs a clamping action, and the tenon of the chuck trigger positioned at the first starting position moves along the first path toward the first preset position. When the fixed operating member of the fixed trigger is pressed, the push rod of the fixed trigger positioned at the second starting position moves along the second path toward the second preset position, and if the tenon is located at the first starting position, it will interfere with the movement of the push rod toward the second preset position. The push rod has a slot, and when the push rod is located at the second preset position, the slot is arranged on the first path and the opening of the slot faces the first preset position, so that when the chuck operating member is not pressed, the tenon enters the slot from the opening.

Description

Technical Field

[0001] The present invention relates to a harmonic knife, and more particularly to a harmonic knife with a fixed function. Background Art

[0002] Harmonic knives are often used in surgical operations to perform actions such as cutting and hemostasis. However, when a harmonic knife is used to stop bleeding, it is generally through harmonic vibration (for example, ultrasonic oscillation) to directly cut or coagulate tissues, blood vessels, and other biological parts or other objects. This method will destroy or change tissues, blood vessels, and other biological parts or other objects, such as directly cutting and closing blood vessels, and therefore, in implementation, it is still necessary to consider the possible impact or consequences after changing or destroying biological parts or other objects. However, in actual surgical operations, temporary hemostasis or fixation actions are often required, and therefore the above-mentioned harmonic knife that can only perform cutting or coagulation actions will encounter many inconveniences in practical application. In order to improve the convenience and safety of surgical operations, a harmonic knife that can flexibly stop bleeding or fixate without using harmonic vibration to cut or coagulate biological parts or other objects is needed. Summary of the invention

[0003] To solve the above problem, a harmonic knife with fixed function is provided according to one embodiment of the present invention, which comprises:

[0004] A chuck head having:

[0005] a first clamping piece configured to vibrate harmonically, and

[0006] A second clamping piece, configured to be clamped or separated with the first clamping piece;

[0007] A chuck trigger having a chuck operating member and a tenon that are linked, and the tenon is positioned at a first starting position by a first elastic member, wherein when the chuck operating member is pressed, the chuck portion performs a clamping action, and the tenon moves along a first path toward a first preset position; and

[0008] A fixed trigger has a linked fixed operating member and a push rod, and the push rod is positioned at a second starting position by a second elastic member, wherein when the fixed operating member is pressed, the push rod moves along a second path toward a second preset position, and if the tenon is located at the first starting position, it interferes with the push rod moving toward the second preset position, and

[0009] The push rod has a slot, and when the push rod is located at the second preset position, the slot is arranged on the first path and the opening of the slot faces the first preset position, so that when the chuck operating member is not pressed, the tenon enters the slot from the opening, and the tenon is blocked and cannot be elastically driven back to the first starting position, so that the chuck head maintains a clamped locking state.

[0010] Preferably, further comprising:

[0011] a driving device configured to apply ultrasonic waves to the first clamping piece so as to cause the first clamping piece to vibrate harmonics;

[0012] an actuation key configured to be pressed to activate the actuation device; and

[0013] A driving trigger having a linked driving operating member and a cushion block, wherein the cushion block is positioned at a third starting position by a third elastic member and has an opening;

[0014] When the driving operating member is pressed, the pad moves toward the driving key to press the driving key; and

[0015] Wherein, the fixed trigger further has a fixed plug-in connected with the fixed operating member, and when the fixed operating member is pressed, if the cushion block is located at the third starting position, the fixed plug-in is inserted into the opening, so that the movement of the cushion block is blocked and the driving key cannot be pressed.

[0016] Preferably, the slot is surrounded and defined by a side wall portion, and the end of the inner portion of the side wall portion located between the slot and the second starting position has a slope structure so that the length of the inner portion from the base to the end gradually decreases in the direction toward the inside of the slot.

[0017] Preferably, the slot is surrounded and defined by a side wall portion, and the end of the side wall portion located on the outer portion of the slot facing away from the second starting position has a slope structure so that the length of the outer portion from the base to the end gradually decreases in a direction away from the interior of the slot.

[0018] Preferably, the slot is defined by a side wall portion, and an end of an inner portion of the side wall portion located between the slot and the second starting position and an end of an outer portion of the side wall portion located on the side of the slot opposite to the second starting position both have a slope structure, so that the length of the inner portion from the base to the end gradually decreases in a direction toward the interior of the slot, and the length of the outer portion from the base to the end gradually decreases in a direction away from the interior of the slot.

[0019] Preferably, in the locked state, when the clamp operating member is pressed, the tenon is driven to move toward the first preset position and leave the slot, and if the fixed operating member is not pressed at this time, the push rod is elastically driven to return to the second starting position along the second path to release the locked state.

[0020] The harmonic knife provided according to the embodiments of the present invention, in addition to being able to perform general harmonic vibrations (e.g., ultrasonic oscillations), can also perform hemostasis or fixation of specific targets without activating harmonic vibrations (e.g., ultrasonic oscillations). Therefore, the harmonic knife provided according to the embodiments of the present invention can further improve the convenience during surgical operations, and can reduce or avoid the negative effects that may be caused by directly cutting or coagulating blood vessels or other parts of a biological body or other objects. In addition, due to the addition of hemostasis or fixation functions, the harmonic knife provided according to the embodiments of the present invention can reduce the surgical instruments that need to be prepared or used in a limited surgical space; or the surgical incision where the surgical instruments need to be placed can be made smaller, thereby making the operation more convenient and reducing the damage to the biological body caused by the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 4 is a schematic diagram of a harmonic knife with fixed functions according to an embodiment of the present invention.

[0022] FIG. 2A to FIG. 2B FIG. 1 is a schematic diagram of a harmonic knife in an unclamped state S01 according to an embodiment of the present invention.

[0023] FIG. 3A to FIG. 3B FIG. 1 is a schematic diagram of a harmonic knife in a clamping state S02 according to an embodiment of the present invention.

[0024] FIG. 4A to FIG. 4B Schematic diagram of a harmonic knife in a pre-positioning state S03 according to an embodiment of the present invention.

[0025] FIG. 5A to FIG. 5B FIG. 4 is a schematic diagram of a harmonic knife in a locked state S04 according to an embodiment of the present invention.

[0026] FIG. 6A to FIG. 6B Schematic diagram of a harmonic knife in a release state S05 according to an embodiment of the present invention.

[0027] FIG. 7A to FIG. 7B Schematic diagram of a harmonic knife being unlocked and returned to an unclamped state S01 according to an embodiment of the present invention.

[0028] Figure 8 and Fig. 9 FIG. 4 is a schematic diagram of a harmonic knife having a bevel structure to assist in guiding according to another embodiment of the present invention.

[0029] Fig.10FIG. 4 is a schematic diagram of a harmonic knife with fixed functions according to an embodiment of the present invention.

[0030] FIG. 11A to FIG. 12B FIG. 1 is a schematic diagram of a harmonic knife according to an embodiment of the present invention, wherein a driving trigger is operated to control a driving device to start harmonic vibration.

[0031] FIG. 13A to FIG. 14 Schematic diagram of a harmonic knife preventing harmonic vibration from initiating in a clamping and locking state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] Various embodiments will be described below, and those with ordinary knowledge in the art should be able to easily understand the spirit and principles of the present invention by referring to the description with the accompanying drawings. However, although some specific embodiments will be specifically described in the text, these embodiments are only illustrative and are not considered to be limiting or exhaustive in all aspects. Therefore, for those with ordinary knowledge in the art, various changes and modifications to the present invention should be obvious and easily achievable without departing from the spirit and principles of the present invention.

[0033] Reference Figure 1 According to an embodiment of the present invention, a harmonic knife 10 with a fixing function includes: a chuck portion 100; a chuck trigger 200 and a fixing trigger 300. Specifically, according to this embodiment, the harmonic knife 10 may substantially include an operation unit 810 for an operator to operate and an actuation unit 820 for actually performing an action (such as harmonic vibration or fixing, etc.) in accordance with the operation. The operation unit 810 may include a chuck trigger 200 and a fixing trigger 300, and the actuation unit 820 may include the chuck portion 100.

[0034] As described above, the chuck portion 100 may include a first clamping piece 110 configured to perform harmonic vibration, and a second clamping piece 120 configured to clamp or separate from the first clamping piece 110. The chuck trigger 200 is used to control the clamping action of the chuck portion 100.

[0035] For more details, please refer to Figure 2A and Figure 2B The chuck trigger 200 has a chuck operating member 205 and a tenon 210 that are linked. The tenon 210 is positioned at the first starting position P1 by the first elastic member 11. In addition, the fixed trigger 300 may have a fixed operating member 305 and a push rod 310 that are linked. The push rod 310 is positioned at the second starting position P2 by the second elastic member 12. As described above, FIG. 2A to FIG. 2B In the state shown, the harmonic blade 10 is in an unclamped state S01.

[0036] Next, please refer to FIG. 3A to FIG. 3B, the operator can control the chuck part 100 and the tenon 210 by operating the chuck operating member 205. Specifically, when the chuck operating member 205 is pressed, the chuck part 100 can perform a clamping action. In addition, when the chuck operating member 205 is pressed, the tenon 210 moves from the first starting position P1 toward the first preset position T1 along the first path L1. As described above, at this time, the harmonic knife 10 is in the clamping state S02, wherein the first clamping piece 110 and the second clamping piece 120 of the chuck part 100 are clamped with each other.

[0037] Next, please continue to refer to FIG. 4A to FIG. 4B The fixed trigger 300 may include a fixed operating member 305 and a push rod 310 linked thereto. When the fixed operating member 305 is pressed, the push rod 310 linked thereto may move along the second path L2 from the second starting position P2 toward the second preset position T2. ​​In this state, if the tenon 210 is still at the first starting position P1 (e.g. Figure 2A and Figure 2B The unclamped state S01 shown in FIG. 1 will interfere with the movement of the push rod 310 toward the second preset position T2. ​​However, if the tenon 210 has moved to the first preset position T1 along the first path L1 (continuing FIG. 3A to FIG. 3B The clamping state S02) of the harmonic knife 10 is such that the tenon 210 does not prevent the push rod 310 from moving to the second preset position T2. ​​Therefore, pressing the fixing operation member 305 can move the push rod 310 to the second preset position T2. ​​At this time, the harmonic knife 10 is in the pre-positioning state S03.

[0038] like Figure 4A and Figure 4B As shown, the push rod 310 has a slot 315. When the push rod 310 is located at the second preset position T2, the slot 315 is arranged on the first path L1 and the opening O of the slot 315 faces the first preset position T1. Figure 5A and Figure 5B As shown, when the clamp operating member 205 pressing the clamp trigger 200 is released, that is, when the clamp operating member 205 is not pressed, the tenon 210 is elastically driven to move toward the first starting position P1 and enters the clamping groove 315 from the opening O. Then, the clamping groove 315 blocks the tenon 210 and cannot be elastically driven to return to the first starting position P1. In addition, the push rod 310 is also blocked by the tenon 210 and cannot return to the second starting position P2. In this way, the clamp operating member 205 that is mutually linked with the tenon 210 can be maintained in the locking state S04 that keeps the clamping part 100 clamped. That is, the harmonic knife 10 is in the clamping locking state S04.

[0039] In this state, the clamping part 100 can be kept clamped without continuously pressing the clamping part operating member 205. In addition, according to this embodiment, since the tenon 210 and the push rod 310 are mutually blocked, it is also unnecessary to continuously press the fixing operating member 305.

[0040] Based on the above-mentioned clamping locking state S04, the harmonic knife 10 according to this embodiment can directly fix a specific part or object, such as a blood vessel, during surgery to perform fixation or hemostasis without starting harmonic vibration and other actions. Further, according to some embodiments, in this state, the hand that is pressing can also be released to perform other operations. For example, in a state where a specific blood vessel is fixed to avoid bleeding, the hand is freed to perform suturing of internal organs and other parts. As mentioned above, the harmonic knife 10 based on the embodiment of the present invention can perform temporary fixation or hemostasis during surgery in a manner that causes less damage or risk to the organism, or can increase the flexibility of surgical operations. Therefore, the safety and / or convenience of surgical operations can be improved, thereby improving the quality and efficiency of the surgery.

[0041] In the following, further reference will be made to 6A to 7B The process of releasing the locking state S04 of the harmonic knife 10 according to an embodiment of the present invention is described.

[0042] As mentioned above, when the clamping state does not need to be maintained, for example, when the biological body has coagulated and stopped bleeding or the object to be fixed no longer needs to be fixed, the clamping locking state S04 can be released. Fig. 6A and Figure 6B In the above locking state S04, according to the harmonic knife 10 of this embodiment, the clamp operating member 205 can be pressed again to move the tenon 210 toward the first preset position T1 and leave the clamping groove 315. Fig. 6A and Figure 6B In the unlocked state S05, if the fixed operating member 305 is not pressed, the push rod 310 is elastically driven to return to the second starting position P2 along the second path L2 to release the locked state S04.

[0043] After the unlocking state S04 and the unlocking state S05, if Fig. 7A and Figure 7B As shown in FIG. 1 , when the clamp operating member 205 is released again, the clamping portion 100 will be released from the clamping state, and the tenon 210 will be elastically driven to return to the original first starting position P1, so that the entire harmonic knife 10 returns to the unclamped state S01 (similar to the above Figure 2A and Figure 2B shown).

[0044] The specific structures of the various parts of the harmonic blade 10 with fixed functions, such as size or shape, are only examples, and the present invention is not limited thereto. For example, please refer to Figure 8 According to another embodiment of the present invention, the slot 315 of the push rod 310 may be surrounded and defined by a side wall portion 350, and the side wall portion 350 may have an inner portion W1 located between the slot 315 and the second starting position P2, and the end w14 of the inner portion W1 has a slope structure 381. Based on the slope structure 381, the length of the inner portion W1 from the base w12 to the end w14 gradually decreases in the direction toward the inside of the slot 315.

[0045] As mentioned above, refer to Figure 8 With the inclined surface structure 381, for example, in the transition process from the pre-positioning state S03 to the clamping locking state S04, the tenon 210 can be guided by the inclined surface structure 381 to enter the slot 315 more smoothly. In addition, if the tenon 210 slightly deviates from the slot 315 and deviates toward the inner part W1 of the slot 315 during the state switching process, the tenon 210 can also avoid sliding into the other side of the inner part W1 facing away from the slot 315.

[0046] Next, please refer to Fig. 9 Similarly, according to another embodiment of the present invention, the slot 315 of the push rod 310 may be surrounded and defined by a side wall portion 350, and the side wall portion 350 may have an outer portion W2 on the side facing away from the second starting position P2, and the end w24 of the outer portion W2 has a slope structure 382. Based on the slope structure 382, ​​the length of the outer portion W2 from the base w22 to the end w24 gradually decreases in a direction away from the inside of the slot 315.

[0047] As mentioned above, refer to Fig. 9 With the inclined surface structure 382, ​​for example, during the transition from the released position state S05 to the unclamped state S01, the latch 210 can be guided by the inclined surface structure 382 to return to the first starting position P1 more smoothly. In addition, if the latch 210 slightly deviates and contacts the outer portion W2 of the side wall 350 during the state switching process, the latch 210 that is to be released from the clamping action can also be prevented from accidentally sliding into the clamping groove 315 and being clamped again.

[0048] According to some embodiments of the present invention, the above Figure 8 and Fig. 9 The inner portion W1 and the outer portion W2 of the side wall portion 350 may be separate and unconnected side walls. Figure 8 and Fig. 9 The inner portion W1 and the outer portion W2 of the side wall portion 350 may be side walls that are disposed in different directions but are interconnected or integrally formed.

[0049] Further, the above reference Figure 8 and Fig. 9 The detailed description is only for example, and the present invention is not limited thereto. For example, according to some embodiments, the harmonic knife may also have Figure 8 The inclined surface structure 381 and Fig. 9 The inclined surface structure 382 shown. For example, according to one embodiment, the slot 315 may be surrounded and defined by the side wall portion 350, and the end w14 of the inner portion W1 of the side wall portion 350 located between the slot 315 and the second starting position P2 and the end w24 of the outer portion W2 of the side wall portion 350 located on the side of the slot 315 facing away from the second starting position P2 may both have inclined surface structures 381 and 382, ​​respectively. Continuing from the above, in this aspect, the length of the inner portion W1 from the base w12 to the end w14 gradually decreases in the direction toward the inside of the slot 315, and the length of the outer portion W2 from the base w22 to the end w24 gradually decreases in the direction away from the inside of the slot 315. Based on this structure, the transition process from the pre-positioning state S03 to the clamping locking state S04; or the transition process from the release position state S05 to the unclamped state S01 can be carried out more smoothly.

[0050] As described above, in order to define the slot 315 , the sidewall portion 350 of each embodiment of the present invention is not limited to the examples specifically described herein.

[0051] Hereinafter, a harmonic knife with a foolproof mechanism according to an embodiment of the present invention will be further described.

[0052] Reference Fig.10 According to one embodiment, the harmonic knife 20 includes a foolproof mechanism that can prevent the harmonic vibration from being unexpectedly activated. For example, the harmonic knife 20 includes a foolproof mechanism that can prevent the first clamping piece 110 from being accidentally vibrated in harmonics. The harmonic knife 20 has a structure similar to the harmonic knife 10 described above, and the operating unit 810' may have a driving trigger 400 that can activate the harmonic vibration by, for example, pressing d. Fig.11A and Fig. 11B The harmonic knife 20 includes a driving unit 500 having a driving device 510 and a driving key 505 configured to be pressed to activate the driving device 510; and a driving trigger 400 having a linked driving operating member 405 and a cushion block 410 for operating to open the driving unit 500. The cushion block 410 can be positioned at a third starting position P3, for example, by a third elastic member 13, and has an opening H passing through it.

[0053] Continuing from the above, please refer to Fig. 12A and Fig. 12B, the driving operating member 405 of the harmonic knife 20 can be operated, for example, by pressing d. When the driving operating member 405 is pressed, the pad 410 linked to the driving operating member 405 will move together and move toward the driving key 505 to press the driving key 505. Specifically, when the driving operating member 405 is operated, the pad 410 will move from the third starting position P3 originally positioned to the third preset position T3. As mentioned above, the third preset position T3 can be substantially located on the driving key 505. Therefore, the pad 410 can move to press the driving key 505, and thus the driving device 510 is turned on. When the driving device 510 is turned on, ultrasonic waves can be applied to the first clamping piece 110, so that the first clamping piece 110 performs harmonic vibration. Thereby, when the operator operates the driving operating member 405, the driving device 510 of the driving part 500 can be turned on to make the first clamping piece 110 perform harmonic vibration. Therefore, during surgery, the driving operating member 405 can be operated to cause the first clamping piece 110 at the front end of the harmonic knife 20 to shear or cut a preset part or object (such as a blood vessel) based on harmonic vibration.

[0054] Based on the above, according to this embodiment, further refer to Fig.13A , Fig. 13B and since Fig. 13B Schematic diagram of components such as the pad block 410 observed in the direction D Fig.14 The fixed trigger 300 described above may further include a fixed plug-in 320 that is linked to the fixed operating member 305, and when the fixed operating member 305 is operated to move the push rod 310 to the second preset position T2 (as described above), FIG. 4A to FIG. 5B ), the fixed plug-in 320 linked therewith can be inserted into the opening H of the cushion block 410. As mentioned above, if the fixed plug-in 320 is inserted into the opening H, the movement of the cushion block 410 will be blocked. In detail, when the fixed operating member 305 is pressed, if the cushion block 410 is located at the third starting position P3, the fixed plug-in 320 will be inserted into the opening H, so that the movement of the cushion block 410 is blocked and cannot be moved to the third preset position T3 to press the d drive key 505.

[0055] In detail, similar to the above FIG. 4A to FIG. 5BWhen the fixing operating member 305 is operated to make the harmonic knife 20 be in the pre-positioning state S03 or the clamping locking state S04, the clamping part 100 of the harmonic knife 20 is in the clamping state, and can be used to fix a specific part or object or clamp and stop bleeding on a specific part. However, if the harmonic vibration is started by careless or accidental operation such as pressing the driving operating member 405 at this time, the part or object that is not intended to be cut or sheared by the harmonic vibration will be cut or sheared unexpectedly. However, according to this embodiment, when in the above state, the fixing plug-in 320 will be inserted into the opening H of the cushion block 410 to limit the cushion block 410 from moving to press the start driving device 510, and thereby prevent the harmonic vibration from being accidentally turned on. Therefore, the unexpected cutting or shearing can be avoided based on this foolproof mechanism.

[0056] As described above, based on this structural design, harmonic vibration can be used to shear or cut an object or part when necessary, but when switching to the preparatory positioning state S03 or the clamping locking state S04 for pure fixing or clamping to stop bleeding, the harmonic vibration can be avoided to shear or cut an object or part. Therefore, the harmonic knife 20 according to this embodiment can be operated and applied more flexibly, and can avoid mistakes caused by operator carelessness or other unexpected reasons, thereby improving the convenience of surgery and the stability and safety of surgery.

[0057] In summary, the harmonic knife according to each embodiment of the present invention, in addition to the shearing or cutting function of harmonic vibration, can further have a fixing function or hemostasis function to reduce or avoid damage or modification to the structure of a specific object or part. Therefore, the harmonic knife according to each embodiment of the present invention can improve the operability and flexibility of the operation, thereby improving the quality and efficiency of the operation.

[0058] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A harmonic knife with fixed function, characterized in that: Include: A chuck head having: a first clamping piece configured to vibrate harmonically, and A second clamping piece, configured to be clamped or separated with the first clamping piece; A chuck trigger having a linked chuck operating member and a tenon, wherein the tenon is positioned at a first starting position by a first elastic member, wherein when the chuck operating member is pressed, the chuck portion performs a clamping action, and the tenon moves along a first path toward a first preset position; and A fixed trigger has a linked fixed operating member and a push rod, and the push rod is positioned at a second starting position by a second elastic member, wherein when the fixed operating member is pressed, the push rod moves along a second path toward a second preset position, and if the tenon is located at the first starting position, it interferes with the push rod moving toward the second preset position, and The push rod has a slot, and when the push rod is located at the second preset position, the slot is arranged on the first path and the opening of the slot faces the first preset position, so that when the chuck operating member is not pressed, the tenon enters the slot from the opening, and the tenon is blocked and cannot be elastically driven back to the first starting position, so that the chuck head maintains a clamped locking state.

2. The harmonic knife according to claim 1, characterized in that: Further including: a driving device configured to apply ultrasonic waves to the first clamping piece so as to cause the first clamping piece to vibrate harmonics; an actuation key configured to be pressed to activate the actuation device; as well as A driving trigger having a linked driving operating member and a cushion block, wherein the cushion block is positioned at a third starting position by a third elastic member and has an opening; When the driving operating member is pressed, the cushion block moves toward the driving key to press the driving key; and Wherein, the fixed trigger further has a fixed plug-in connected with the fixed operating member, and when the fixed operating member is pressed, if the cushion block is located at the third starting position, the fixed plug-in is inserted into the opening, so that the movement of the cushion block is blocked and the driving key cannot be pressed.

3. The harmonic knife according to claim 1, characterized in that: The slot is surrounded and defined by a side wall portion, and the end of the inner portion of the side wall portion located between the slot and the second starting position has a slope structure, so that the length of the inner portion from the base to the end gradually decreases in a direction toward the inside of the slot.

4. The harmonic knife according to claim 1, characterized in that: The slot is surrounded and defined by a side wall portion, and the end of the side wall portion located at the outer portion of the slot facing away from the second starting position has a slope structure, so that the length of the outer portion from the base to the end gradually decreases in a direction away from the inside of the slot.

5. The harmonic knife according to claim 1, characterized in that: The slot is defined by a side wall portion, and the end of the inner portion of the side wall portion located between the slot and the second starting position and the end of the outer portion of the side wall portion located on the side of the slot opposite to the second starting position both have a slope structure, so that the length of the inner portion from the base to the end gradually decreases in the direction toward the inside of the slot, and the length of the outer portion from the base to the end gradually decreases in the direction away from the inside of the slot.

6. The harmonic knife according to claim 1, characterized in that: In the locked state, when the clamp operating member is pressed, the tenon is driven to move toward the first preset position and leave the slot. If the fixed operating member is not pressed at this time, the push rod is elastically driven to return to the second starting position along the second path to release the locked state.

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