SAFETY DEVICE FOR SURGICAL INSTRUMENT

Abstract

A surgical instrument (1) with a safety mechanism includes an end effector, an intermediate connector, and a controller (100), wherein the controller (100) includes housings (101, 102), a drive mechanism, the safety mechanism, and a reset mechanism, the drive mechanism, the safety mechanism and the reset mechanism being arranged or partially arranged in the housings (101, 102); the safety mechanism includes a safety trigger (104), a dry firing function block (109), and a biasing member (110). The surgical instrument can solve the problem that the instrument cannot be fired and reset when an automatic reset mechanism thereof fails, thereby protecting patient safety, and having a simple structure and a low cost.

Claims

1. A surgical instrument, comprising an end effector, an intermediate connector and a controller which are sequentially connected, wherein the controller comprises housings, and a drive mechanism and a safety mechanism which are arranged or partially arranged in the housings; and the safety mechanism comprises a safety trigger, a dry firing function block, and a biasing member.

2. The surgical instrument according to claim 1, wherein the drive mechanism comprises a firing trigger, and a driving pawl and a toothed rack which are arranged in the firing trigger; the biasing member keeps the dry firing function block away from the toothed rack; and when the safety mechanism is not armed, the dry firing function block limits the engagement between the driving pawl and the toothed rack.

3. The surgical instrument according to claim 2, wherein the toothed rack comprises a first set of teeth and a second set of teeth; the biasing member keeps the dry firing function block away from the second set of teeth of the toothed rack; and when the safety mechanism is not armed, the dry firing function block limits the engagement between the driving pawl and the second set of teeth.

4. The surgical instrument according to claim 3, wherein the surgical instrument comprises an automatic reset mechanism; the automatic reset mechanism comprises a toothed rack limit slider; when the firing trigger is operated, the toothed rack drives the toothed rack limit slider to move forward, until the toothed rack limit slider pushes the dry firing function block to overcome a force of the biasing member and move; and the dry firing function block limits the engagement between the driving pawl and the second set of teeth.

5. The surgical instrument according to claim 3, wherein the safety trigger is operated, the dry firing function block can move away from the second set of teeth, so as to release the limited engagement between the driving pawl and the second set of teeth.

6. The surgical instrument according to claim 4, wherein when the safety trigger is operated, the toothed rack limit slider is detached from the dry firing function block, and the dry firing function block keeps away from the second set of teeth under the action of the biasing member, so as to release the limited engagement between the driving pawl and the second set of teeth.

7. The surgical instrument according to claim 3, wherein the dry firing function block comprises a shielding structure; when the dry firing function block moves adjacent to the second set of teeth of the toothed rack, the shielding structure shields the second set of teeth of the toothed rack with the movement of the dry firing function block; and when the dry firing function block is away from the second set of teeth, the shielding of the second set of teeth by the shielding structure is released.

8. The surgical instrument according to claim 7, wherein the shielding structure has a flaky shape, or a blocky shape, or a strip shape.

9. The surgical instrument according to claim 1, wherein the dry firing function block rotates about an axis.

10. The surgical instrument according to claim 1, wherein the dry firing function block makes a rectilinear or curvilinear motion along a specific guide rail.

11. The surgical instrument according to claim 1, wherein the biasing member is an elastic member.

12. The surgical instrument according to claim 11, wherein the biasing member is one of an elastic sheet, a tension spring, a pressure spring, and a torsion spring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are provided for further understanding the present invention, constitute a part of the specification, and are used, together with specific embodiments of the present invention, to explain the present invention, but are not intended to limit the present invention.

[0023] FIG. 1 is a state view of internal components in an original state in a surgical stapler according to one embodiment of the present invention;

[0024] FIG. 2 is a vertical view of a controller of the surgical stapler in FIG. 1;

[0025] FIG. 3 is sectional view of a part of the controller in FIG. 2, and shows the original state of the internal components;

[0026] FIG. 4 is a state view of the internal components after a firing trigger is operated in the surgical stapler according to one embodiment of the present invention;

[0027] FIG. 5 is a state view of the internal components before a safety is armed in the surgical stapler according to one embodiment of the present invention;

[0028] FIG. 6 is a state view of the internal components after the safety is armed in the surgical stapler according to one embodiment of the present invention;

[0029] FIG. 7 is a dry firing function block and an elastic sheet according to one embodiment of the present invention;

[0030] FIG. 8 is a toothed rack limit slider according to one embodiment of the present invention;

[0031] FIG. 9 is a toothed rack according to one embodiment of the present invention; and

[0032] FIG. 10 is assembly relationships of a left housing, the dry firing function block, and the elastic sheet according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be further described hereafter with reference to specific embodiments, wherein the drawings are used for illustrative purpose only, denote schematic views only rather than physical views, and thus should not be considered as a limitation to the present patent. In order to describe the specific embodiments of the present invention still better, certain components in the drawings may be omitted, enlarged or minified, and do not denote the sizes of a practical product. For a person skilled in the art, omitting certain commonly known structures in the drawings and the descriptions thereof is understandable. On the basis of the specific embodiments of the present invention, all the other specific embodiments obtained by a person skilled in the art without involving an inventive effort are concluded in the protection scope of the present invention.

[0034] FIGS. 1-10 show schematic views of the stapler or components thereof according to one embodiment of the present invention.

[0035] Specifically, in the present embodiment, with reference to FIGS. 1 and 4-6, the surgical stapler 1 of the present invention includes a controller 100, an intermediate connector, and an end effector (wherein the intermediate connector and the end effector are conventional structural form in the existing surgical stapler, and are therefore not specifically shown). The controller 100, the intermediate connector, and the end effector are sequentially connected. The end effector includes an anvil assembly, a staple cartridge assembly, and a drive assembly, wherein the anvil assembly and the staple cartridge assembly form a jaw which can switch between an open state and a close state; the drive assembly controls the open and close of the jaw, and pushes out anastomosis staples in the staple cartridge to form at a tissue contact surface of the anvil.

[0036] With reference to FIGS. 1-6, the controller 100 includes a left housing 101, a right housing 102, a firing trigger 103, a safety trigger 104, a driving pawl 105, a toothed rack 106, a toothed rack limit slider 107, a tension spring 108, a dry firing function block 109, and an elastic sheet 110,

[0037] wherein the firing trigger 103 is partially arranged in the left housing 101 and the right housing 102, and can rotate about a fixed rotary shaft; the driving pawl 105 is mounted on the firing trigger 103, and can rotate about a movable rotary shaft; and the driving pawl 105 can be separably engaged with a first set of teeth 1061 or a second set of teeth 1062 of the toothed rack 106.

[0038] With reference to FIGS. 7 and 9-10, a circular hole 1091 is disposed on the dry firing function block 109 (FIG. 7); the circular hole is matched with a cylinder 1011 located at the left housing 101, and can rotate a certain angle about the cylinder 1011 (FIG. 10). One end of the elastic sheet 110 acts on the dry firing function block 109, and the other end acts on the left housing 101; the elastic sheet 110 can enable a shielding structure 1093 located at the dry firing function block 109 to lean to a direction away from the second set of teeth 1062 of the toothed rack 106 (FIG. 9).

[0039] In other embodiments, the dry firing function block 109 can slide along a guide in a direction away from the second set of teeth 1062 of the toothed rack 106; the elastic sheet 110 can also be a spring, a torsion spring, or other elastic components, and acts on the left housing 101, or the right housing 102, or other components.

[0040] With reference to FIG. 8, the toothed rack limit slider 107 is provided with a protruding platform 1071 (FIG. 8), and the protruding platform 1071 is matched with an inclined surface 1092 (FIGS. 7 and 10) of the dry firing function block 109.

[0041] The specific operations of the present embodiment are as follows. As shown in FIG. 4, the firing trigger 103 is rotated by a certain angle; the rotary driving pawl 105 on the firing trigger 103 is engaged with the first set of teeth 1061 of the toothed rack 106, so as to push the toothed rack 106 to move forward a certain distance. A protruding platform 1063 detachably connected to the toothed rack limit slider 107 is disposed on the toothed rack 106; the protruding platform 1063 acts on a protruding platform 1072 arranged on the toothed rack limit slider 107, and drives the toothed rack limit slider 107 to move forward. The toothed rack limit slider 107 contacts the inclined surface 1092 of the dry firing function block 109 via the protruding platform 1071 on a lateral surface, such that the dry firing function block 109 overcomes an elastic force of the elastic sheet 110 to rotate; the dry firing function block 109 rotates a certain angle; and the shielding structure 1093 shields the second set of teeth 1062 of the toothed rack 106.

[0042] As shown in FIG. 5, the firing trigger 103 is released, and the driving pawl 105 is disengaged with the first set of teeth 1061 of the toothed rack 106. If friction forces between the drive assembly and the staple cartridge assembly as well as the anvil assembly are greater than an energy stored by the tension spring 108, the tension spring 108 cannot reset the toothed rack 106 via the toothed rack limit slider 107, and the jaw cannot open, then the firing trigger 103 is operated again, and the driving pawl 105 would not be engaged with the second set of teeth 1062 of the toothed rack 106 and cannot push the toothed rack 106 to move forward because the shielding structure 1093 of the dry firing function block 109 shields the second set of teeth 1062 of the toothed rack 106.

[0043] As shown in FIG. 6, the safety trigger 104 is operated to disengage the toothed rack limit slider 107 from the toothed rack 106 to reset the toothed rack limit slider 107. The protruding platform 1071 of the toothed rack limit slider 107 does not contact the inclined surface 1092 of the dry firing function block 109; under the action of the elastic sheet 110, the shielding structure 1093 of the dry firing function block 109 gets away from the second set of teeth 1062 of the toothed rack 106. The firing trigger 103 is operated again; and the driving pawl 105 can be engaged with the second set of teeth 1062 of the toothed rack 106, so as to push the toothed rack 106 to move forward to suture a cut.

[0044] Although the specific embodiments of the present invention have been shown and described, it can be understood that a person skilled in the art can make various changes, modifications, substitutions and variations to the specific embodiments without departing from the principle and spirit of the present invention; and the scope of the present invention is defined by the attached claims and equivalents thereof.