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US-20260123928-A1 - A STAPLING SURGICAL INSTRUMENT AND A LOADING UNIT

US20260123928A1US 20260123928 A1US20260123928 A1US 20260123928A1US-20260123928-A1

Abstract

A stapling surgical instrument includes a shaft assembly and a loading unit; wherein the shaft assembly includes a main body, a firing rod, and a sensing collar, the main body surrounds the sensing collar, the sensing collar surrounds the firing rod directly, a distal end of the main body is provided with a notch; the loading unit includes an insertion portion, a proximal end of the insertion portion and the mounting boss are spaced apart by a first distance along the longitudinal axis; when the loading unit is configured to be releasably mounted to the shaft assembly, the insertion portion is inserted into the notch, the second lumen is provided with a second dimension to accommodate a distal end of the firing rod and a distal end of the sensing collar, and the first lumen is provided with a first dimension to accommodate the distal end of the firing rod.

Inventors

  • Guang Yang
  • Chuangang TANG
  • Honglin Nie

Assignees

  • EZISURG (SUZHOU) MEDICAL CO., LTD.
  • EZISURG MEDICAL CO., LTD.

Dates

Publication Date
20260507
Application Date
20251009
Priority Date
20241014

Claims (10)

  1. 1 . A stapling surgical instrument comprising a shaft assembly ( 20 ) and a loading unit ( 30 ); wherein the shaft assembly ( 20 ) comprises a main body ( 221 ), a firing rod ( 23 ), and a sensing collar ( 24 ), the main body ( 221 ) surrounds the sensing collar ( 24 ), the sensing collar ( 24 ) surrounds the firing rod ( 23 ) directly, the firing rod ( 23 ) is aligned with a longitudinal axis, and a distal end of the main body ( 221 ) is provided with a notch ( 2212 ); the loading unit ( 30 ) comprises an insertion portion ( 36 ), the insertion portion ( 36 ) is provided with a mounting boss ( 311 ), a first lumen ( 3101 ), and a second lumen ( 3102 ), a proximal end of the insertion portion ( 36 ) and the mounting boss ( 311 ) are spaced apart by a first distance along the longitudinal axis, the first lumen ( 3101 ) and the second lumen ( 3102 ) are configured to intersect with each other; when the loading unit ( 30 ) is configured to be releasably mounted to the shaft assembly ( 20 ), the insertion portion ( 36 ) is inserted into the notch ( 2212 ), the second lumen ( 3102 ) is provided with a second dimension to accommodate a distal end of the firing rod ( 23 ) and a distal end of the sensing collar ( 24 ), and the first lumen ( 3101 ) is provided with a first dimension to accommodate the distal end of the firing rod ( 23 ).
  2. 2 . The stapling surgical instrument according to claim 1 , wherein different loading units ( 30 ) are provided with different staple line lengths; a boundary between the first lumen ( 3101 ) and the second lumen ( 3102 ) defines a working surface ( 3103 ), and the mounting boss ( 311 ) and the working surface ( 3103 ) are spaced apart by a second distance along the longitudinal axis; the second distance is set based on the staple line length.
  3. 3 . The stapling surgical instrument according to claim 2 , wherein the stapling surgical instrument further comprises a handle assembly ( 11 ), the handle assembly ( 11 ) comprises a control circuit ( 15 ) and a slider ( 18 ), the control circuit ( 15 ) comprises a mounting sensor module ( 151 ), and the shaft assembly ( 20 ) further comprises a sensing mechanism ( 29 ); when the loading unit ( 30 ) is configured to be mounted to the shaft assembly ( 20 ), the working surface ( 3103 ) is configured to drive the sensing mechanism ( 29 ) to push the slider ( 18 ), the mounting sensor module ( 151 ) is configured to detect a position of the slider ( 18 ), and the control circuit ( 15 ) is configured to identify the staple line length of the loading unit ( 30 ).
  4. 4 . The stapling surgical instrument according to claim 3 , wherein the handle assembly ( 11 ) further comprises a drive assembly ( 14 ), the drive assembly ( 14 ) comprises a rack ( 143 ), and the control circuit ( 15 ) further comprises a displacement sensor module ( 152 ); when the loading unit ( 30 ) is configured to be mounted to the shaft assembly ( 20 ), the control circuit ( 15 ) is configured to control the drive assembly ( 14 ) to drive the firing rod ( 23 ), and the displacement sensor module ( 152 ) is configured to detect a displacement of the rack ( 143 ), thereby enabling the control circuit ( 15 ) to control a firing stroke of the loading unit ( 30 ).
  5. 5 . The stapling surgical instrument according to claim 1 , wherein the shaft assembly ( 20 ) further comprises a bending control mechanism ( 27 ), and the loading unit ( 30 ) further comprises a jaw assembly ( 32 ) and a bending control rod ( 35 ); the insertion portion ( 36 ) further comprises a narrow slot ( 312 ), the narrow slot ( 312 ) passes through sidewalls of the first lumen ( 3101 ) and the second lumen ( 3102 ), and the bending control rod ( 35 ) is disposed in the narrow slot ( 312 ); when the loading unit ( 30 ) is configured to be mounted to the shaft assembly ( 20 ), the bending control mechanism ( 27 ) is configured to drive the bending control rod ( 35 ) to bend the jaw assembly ( 32 ).
  6. 6 . The stapling surgical instrument according to claim 2 , wherein the shaft assembly ( 20 ) further comprises a locking slider ( 281 ) and an elastic member ( 283 ); during a process of mounting the loading unit ( 30 ) to the shaft assembly ( 20 ), when the insertion portion ( 36 ) pushes the locking slider ( 281 ) to move to a proximal position, the locking slider ( 281 ) is configured to allow the mounting boss ( 311 ) to rotate relative to the main body ( 221 ); when the elastic member ( 283 ) resiliently returns the locking slider ( 281 ) to a distal position, the locking slider ( 281 ) is configured to prevent the mounting boss ( 311 ) from rotating relative to the main body ( 221 ).
  7. 7 . The stapling surgical instrument according to claim 4 , wherein the loading unit ( 30 ) comprises a first loading unit ( 30 A) or a second loading unit ( 30 B), and the mounting sensor module ( 151 ) comprises a first mounting sensor switch ( 1511 A) and a second mounting sensor switch ( 1511 B); wherein the staple line length of the first loading unit ( 30 A) is greater than the staple line length of the second loading unit ( 30 B); when the first loading unit ( 30 A) is mounted to the shaft assembly ( 20 ), the slider ( 18 ) is configured to actuate the first mounting sensor switch ( 1511 A) and not actuate the second mounting sensor switch ( 1511 B), and the control circuit ( 15 ) is configured to identify the staple line length of the first loading unit ( 30 A); when the second loading unit ( 30 B) is mounted to the shaft assembly ( 20 ), the slider ( 18 ) is configured to actuate the first mounting sensor switch ( 1511 A) and actuate the second mounting sensor switch ( 1511 B), and the control circuit ( 15 ) is configured to identify the staple line length of the second loading unit ( 30 B).
  8. 8 . The stapling surgical instrument according to claim 7 , wherein the displacement sensor module ( 152 ) comprises a first displacement sensor switch ( 1521 A), a second displacement sensor switch ( 1521 B), a third displacement sensor switch ( 1521 C), and a fourth displacement sensor switch ( 1521 D); when the first loading unit ( 30 A) is mounted to the shaft assembly ( 20 ), the rack ( 143 ) is configured to actuate the first displacement sensor switch ( 1521 A) at an initial position; the rack ( 143 ) is configured to move a first displacement to actuate the second displacement sensor switch ( 1521 B); the rack ( 143 ) is configured to move a second displacement to actuate the third displacement sensor switch ( 1521 C); the rack ( 143 ) is configured to move a third displacement to actuate the fourth displacement sensor switch ( 1521 D); and the control circuit ( 15 ) is configured to control a firing stroke of the first loading unit ( 30 A).
  9. 9 . A loading unit comprising an insertion portion ( 36 ) provided with a mounting boss ( 311 ), a first lumen ( 3101 ), and a second lumen ( 3102 ), a proximal end of the insertion portion ( 36 ) and the mounting boss ( 311 ) are spaced apart by a first distance along a longitudinal axis, the first lumen ( 3101 ) and the second lumen ( 3102 ) are configured to intersect with each other; the loading unit is configured to be releasably mounted to a shaft assembly ( 20 ), the shaft assembly ( 20 ) comprises a main body ( 221 ), a firing rod ( 23 ), and a sensing collar ( 24 ), the main body ( 221 ) surrounds the sensing collar ( 24 ), the sensing collar ( 24 ) surrounds the firing rod ( 23 ) directly, the firing rod ( 23 ) is aligned with the longitudinal axis, and a distal end of the main body ( 221 ) is provided with a notch ( 2212 ); when the insertion portion ( 36 ) is inserted into the notch ( 2212 ), the second lumen ( 3102 ) is provided with a second dimension to accommodate a distal end of the firing rod ( 23 ) and a distal end of the sensing collar ( 24 ), and the first lumen ( 3101 ) is provided with a first dimension to accommodate the distal end of the firing rod ( 23 ).
  10. 10 . The loading unit according to claim 9 , wherein the loading unit is provided with different staple line lengths; a boundary between the first lumen ( 3101 ) and the second lumen ( 3102 ) defines a working surface ( 3103 ), the mounting boss ( 311 ) and the working surface ( 3103 ) are spaced apart by a second distance along the longitudinal axis; the second distance is set based on the staple line length.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The disclosure is based upon and claims priority to Chinese Patent Application No.202411434171.5, filed on October 14, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a surgical instrument, in particular to a stapling surgical instrument and a loading unit. BACKGROUND With the development of technology, open surgery has gradually transitioned to endoscopic surgery, and endoscopic staplers have progressively shifted from manual firing to motor-driven firing. Depending on the design, endoscopic staplers generally have two main types: one that replaces loading units with different staple line lengths, and another that replaces staple cartridges. During a surgical procedure, a single stapler may need to be loaded with multiple loading units sequentially to perform tissue stapling and cutting. The easyEndo universal endoscopic cutting stapler loads staple cartridges with staple line lengths of 30 mm, 45 mm, and 60 mm. A stapler that replaces loading units has the following advantages: the same stapler can replace loading units during a surgical procedure, effectively reducing surgical time and lowering surgical costs. In the era of manual firing, when a stapler is equipped with loading units of different staple line lengths, a user determines the firing stroke and stops and retracts after completing the firing. However, when the above design is applied to an endoscopic stapler with motor-driven firing, since the control circuit cannot determine the staple line length of the loading unit and cannot precisely control the firing stroke, it may result in insufficient or excessive firing stroke during use, potentially causing damage to the stapler or harm to the patient. Therefore, a stapler capable of identifying loading units with different staple line lengths is required, which may control the firing stroke of the stapler based on the staple line length of the loading unit to ensure better performance of the stapler. SUMMARY The present disclosure aims to solve the problem in the prior art by providing a stapling surgical instrument capable of identifying whether the loading unit is not mounted or identifying the staple line length of a loading unit. In one aspect of the present disclosure, a stapling surgical instrument including a shaft assembly and a loading unit; wherein the shaft assembly includes a main body, a firing rod, and a sensing collar, the main body surrounds the sensing collar, the sensing collar surrounds the firing rod directly, the firing rod is aligned with a longitudinal axis, and a distal end of the main body is provided with a notch; the loading unit includes an insertion portion, the insertion portion is provided with a mounting boss, a first lumen, and a second lumen, a proximal end of the insertion portion and the mounting boss are spaced apart by a first distance along the longitudinal axis, the first lumen and the second lumen are configured to intersect with each other; when the loading unit is configured to be releasably mounted to the shaft assembly, the insertion portion is inserted into the notch, the second lumen is provided with a second dimension to accommodate a distal end of the firing rod and a distal end of the sensing collar, and the first lumen is provided with a first dimension to accommodate the distal end of the firing rod. In one aspect of the present disclosure, a loading unit including an insertion portion provided with a mounting boss, a first lumen, and a second lumen, a proximal end of the insertion portion and the mounting boss are spaced apart by a first distance along a longitudinal axis, the first lumen and the second lumen are configured to intersect with each other; the loading unit is configured to be releasably mounted to a shaft assembly, the shaft assembly includes a main body, a firing rod, and a sensing collar, the main body surrounds the sensing collar, the sensing collar surrounds the firing rod directly, the firing rod is aligned with the longitudinal axis, and a distal end of the main body is provided with a notch; when the insertion portion is inserted into the notch, the second lumen is provided with a second dimension to accommodate a distal end of the firing rod and a distal end of the sensing collar, and the first lumen is provided with a first dimension to accommodate the distal end of the firing rod. When the loading unit rotates with the shaft assembly, the firing rod and the sensing collar also rotate. The second lumen accommodates a distal end of the firing rod and a distal end of the sensing collar, the firing rod and the sensing collar being arranged adjacent to each other, with other components omitted in between to simplify the rotation of the shaft assembly. Although different loading units have different staple line lengths, a proximal end of the insertion portion and the mounting boss are spaced apart by a first distan