CN217338801U - Fracture reduction forceps - Google Patents

Abstract

The utility model relates to a fracture reduction forceps, include: a pivot shaft defining a first axis, a first jawarm, and a second jawarm, one of the first and second jawarms being pivotably connected to the other of the first and second jawarms about the first axis by means of the pivot shaft; a jaw secured to the distal tip of the first jaw arm, comprising a first jaw end, a second jaw end, and a jaw formed between the first jaw end and the second jaw end, the first jaw end configured for placement at a first bone piece, the second jaw end configured for placement at a second bone piece fractured from the first bone piece, and the jaw configured for insertion therethrough of an implant for connecting the first bone piece and the second bone piece; and a pressing bolt configured to be screw-engaged to the jaws to protrude into the jaws in a direction perpendicular to the first axis, and to apply a pressing force to the implant in a state where the implant is inserted through the jaws. The utility model provides a fracture reduction forceps can implement the fracture reduction with high efficiency accurately.

Description

fracture reduction forceps

technical field

The utility model relates to the technical field of medical instruments used for fracture reduction, and more particularly to fracture reduction forceps.

Background technique

When the patient's tibial plateau, distal femoral condyle, etc. are fractured to produce multiple bone fragments that break each other, the multiple bone fragments can be reduced by means of fracture open reduction and internal fixation or other similar operations. Medical devices commonly used in open reduction and internal fixation or other similar procedures include: implants, such as plates and Kirschner wires, for connecting the plurality of bone fragments; and fracture reduction forceps for temporarily holding the plurality of bone fragments. a plurality of bone fragments to facilitate connection of the implant to at least some of the plurality of bone fragments by means of connectors such as screws, bolts, pins, etc., while the plurality of bone fragments are held in a desired position to be reduced.

It is very necessary to use fracture reduction forceps in open reduction and internal fixation of fractures or other similar operations, not only to avoid manually supporting multiple fractured bone fragments from affecting the surgeon's sight, but also to perform fracture reduction more accurately. However, when currently existing fracture reduction forceps are used, if the part of one of the plurality of bone fragments temporarily held by the fracture reduction forceps happens to be the most If the optimal connection site is found, the fracture reduction forceps need to be readjusted to allow for the optimal connection site, which may lead to reduction and re-displacement, affect the accuracy of fracture reduction, and increase the difficulty of surgery. Therefore, the current fracture reduction forceps cannot well meet the clinical needs.

Utility model content

One object of the present invention is to provide a fracture reduction forceps capable of efficiently and accurately performing fracture reduction.

According to one aspect of the present invention, there is provided a fracture reduction forceps comprising a pivot shaft defining a first axis, a first forceps arm, and a second forceps arm, wherein one of the first forceps arm and the second forceps arm The fracture reduction forceps further comprises: a jaw fixed to the distal end of the first forceps arm, the The jaw includes a first jaw end, a second jaw end, and a jaw formed between the first jaw end and the second jaw end, wherein the first jaw end is configured for placement at the first bone fragment, The second jaw end is configured for placement at a second bone fragment fractured from the first bone fragment, and the jaws are configured for an implant for connecting the first bone fragment and the second bone fragment inserting through; and a compression bolt configured to be threaded into the jaws to extend into the jaws in a direction perpendicular to the first axis, and when the implant is inserted through Pressure is applied to the implant in the state of the jaws.

Optionally, the jaws further include a connecting rod, two ends of the connecting rod are respectively connected to the first claw end and the second claw end, and the connecting rod has a penetrating hole in a direction perpendicular to the first axis. The connecting rod has an inner thread leading to the jaw, and the screw rod of the compression bolt has an outer thread matching the inner thread of the connecting rod.

Optionally, the fracture reduction forceps further includes a spacer configured to be disposed between the compression bolt and the implant in a state where the compression bolt applies pressure to the implant.

Optionally, the gasket includes a gasket pressing surface that abuts against the implant when the pressing bolt applies pressure to the implant, and the gasket pressing surface has an area larger than that of the screw cross-sectional area.

Optionally, the spacer is separable from the compression bolt or fixed to one end of the screw.

Optionally, the pad pressing surface is roughened to increase the friction of the pad pressing surface against the implant.

Optionally, the fracture reduction forceps further includes an angular locking mechanism configured to lock one of the first and second jaw arms around the first relative to the other of the first and second jaw arms. The angle at which the axis pivots.

Optionally, the angle locking mechanism comprises: a hinge post pivotally connected about the second axis to one of the proximal end of the first jaw arm and the proximal end of the second jaw arm; and formed on the first jaw arm a locking interface at the other of the proximal end of the second clamp arm and the proximal end of the second clamp arm, wherein the hinge post is at least partially shaped with a first toothed surface, and the locking interface is at least partially formed with the first toothed surface a surface engageable second toothed surface.

Optionally, the angle locking mechanism includes a hinge shaft fixed to one of the proximal end of the first clamp arm and the proximal end of the second clamp arm and defining a second axis, and a spring mechanism disposed about the hinge shaft, the hinge post is pivotally connected to the hinge shaft about a second axis such that the spring mechanism biases the hinge post to tend to pivot about the second axis toward the locking interface, and the locking interface includes extending through the first jaw along a plane perpendicular to the first axis Channel at the proximal end of the arm.

Optionally, the angle locking mechanism includes a rivet secured to one of the proximal end of the first jaw arm and the proximal end of the second jaw arm and defining a second axis, and a leaf spring secured to the rivet, the hinge post wrapping around the first The two axes are pivotally connected to the rivet such that the leaf spring biases the hinge post to tend to pivot about the second axis toward the locking interface, and the locking interface includes a proximal portion extending through the first jaw arm along a plane perpendicular to the first axis side end channel.

The fracture reduction forceps provided by the present invention includes a jaw having jaws, and an implant can be inserted through the jaws to be placed on the first and second bone fragments across the first and second bone fragments , thereby avoiding the part of each of the first bone fragment and the second bone fragment that is temporarily clamped by the fracture reduction forceps to be the optimal connection for connecting the implant to the corresponding one of the first bone fragment and the second bone fragment part. Moreover, the compression bolt, and the spacer used in conjunction with the compression bolt, can make the temporary positioning of the implant more secure to prevent accidental displacement of the implant. Furthermore, the same fracture reduction forceps can be used universally for many types of implants with high flexibility.

Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which form a part of the specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

1 is a side view of a fracture reduction forceps with an implant according to one embodiment of the present invention.

Figure 2 is a perspective view of the fracture reduction forceps of Figure 1 in use.

FIG. 3 is an enlarged partial view of the fracture reduction forceps of FIG. 2 in use.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise.

Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

It should also be noted that the terms "proximal" and "distal" are used herein with respect to the operator of the fracture reduction forceps 10 (ie, the surgeon or other medical personnel who may use the fracture reduction forceps 10), The term "proximal" refers to the portion of the fracture reduction forceps 10 that is proximate the operator's hand, and the term "distal" refers to that portion of the fracture reduction forceps 10 that is remote from the operator's hand.

Referring to FIG. 1, an exemplary fracture reduction forceps 10 includes a first forceps arm 12 including a first proximal end 12a, a first distal end 12b, and a first proximal end 12a and a first distal end First body 12c curved and/or extending straight between lateral ends 12b, a portion of first body 12c proximate first proximal end 12a is shaped to be grasped by an operator's hand; second forceps Arm 14, second clamp arm 14 includes a second proximal end 14a, a second distal end 14b, and a second curved and/or straight extending between the second proximal end 14a and the second distal end 14b a body 14c, a portion of the second body 14c proximate the second proximal end 14a shaped to be grasped by an operator's hand; and a pivot axis 15 defining a first axis. For example, the pivot shaft 15 may be fixed to the first body 12c, and the second body 14c is connected to the pivot shaft 15 in a pivotable manner about the first axis. Alternatively, the pivot shaft 15 may be fixed to the second body 14c, and the first body 12c is connected to the pivot shaft 15 in a pivotable manner about the first axis. Thus, the pivot shaft 15 is fixed to one of the first body 12c and the second body 14c, and the other of the first body 12c and the second body 14c is pivotably connected to the pivot shaft 15 about the first axis, such that One of the first clamp arm 12 and the second clamp arm 14 is pivotably connected to the other of the first clamp arm 12 and the second clamp arm 14 about a first axis by means of a pivot shaft 15 .

The exemplary fracture reduction forceps 10 also includes jaws 16 secured to the distal ends of the first jaw arms 12 . The jaw 16 includes a first jaw end 16a, a second jaw end 16b, and a connecting rod 16c, which is connected to the first and second jaw ends 16a and 16b at both ends of the connecting rod 16c, respectively. The end 16a and the second claw end 16b extend generally perpendicular to the connecting rod 16c, thereby forming a jaw between the first claw end 16a and the second claw end 16b.

Referring to Fig. 2, during open reduction and internal fixation of a fracture or other similar procedures, the operator may manually manipulate the portion of the first body 12c proximate the first proximal end 12a and the second body by hand the portion of 14c proximate the second proximal end 14a such that the one of the first and second jaw arms 12 and 14 is relative to the other of the first and second jaw arms 12 and 14 Pivoting an angle about the first axis until the first and second jaw ends 16a and 16b of the jaw 16 cooperate with the second distal end 14b of the second jaw arm 14 to temporarily grip the first bone fragment 18a and The second bone fragment 18b is fractured from the first bone fragment 18a, thereby maintaining the first bone fragment 18a and the second bone fragment 18b in the desired position to be reduced. For example, the first claw end 16a is placed on the first portion of the first bone fragment 18a to apply a first pressure to the first portion of the first bone fragment 18a, and the second claw end 16b is placed on the second bone fragment 18b on the first part of the second bone fragment 18b to apply a second pressure to the first part of the second bone fragment 18b. At the same time, the distal end of the second jaw arm 14 is placed on a second portion of the first bone fragment 18a opposite to the first portion opposite to the first and second jaw ends 16a and 16b, so as to extend to the first bone fragment. A third pressure is applied at the second portion of 18a; alternatively, the distal end of the second jaw arm 14 is placed opposite the first claw end 16a and the second claw end 16b on the second bone fragment 18b opposite the first portion. two parts, so as to apply a third pressure to the second part of the second bone fragment 18b.

For operator convenience, the second distal tip 14b of the second clamp arm 14 is a single tip, and the single tip is shaped so that the third pressure can be substantially aligned with and opposite to the combination of the first and second pressures synthetic pressure. In other words, as shown in FIG. 1 , the point of contact of the single end with the second portion of the first bone fragment 18a or the second portion of the second bone fragment 18b is a distance from the first axis that is substantially equal to the first jaw end 16a The distance from the first axis to the midpoint of the line connecting the point of contact with the first portion of the first bone fragment 18a and the point of contact with the first portion of the second bone fragment 18b of the second claw end 16b.

It will be appreciated that in practice the number of fractured bone fragments that need to be reduced may be more than the first and second bone fragments 18a and 18b, but the first and second bone fragments 18a and 18b are critical Two bone fragments, ie, after the first bone fragment 18a and the second bone fragment 18b are clamped, the other bone fragments can be indirectly held in the desired position by the first bone fragment 18a and the second bone fragment 18b .

As shown in Figure 2, after all of the fractured bone fragments are held in the desired position to be reduced, the implant 20 for connecting all the bone fragments, particularly the first bone fragment 18a and the second bone fragment 18b, can be inserted through jaws so that the implant 20 can be placed on the first bone fragment 18a and the second bone fragment 18b across the first bone fragment 18a and the second bone fragment 18b in a direction generally parallel to the first axis. For example, the implant 20 can be configured as a straight sheet, or have other suitable shapes that can be inserted through the jaws. For example, the straight sheet is a steel sheet (eg, 420B stainless steel sheet), or is made of other materials that can be temporarily or permanently placed in a patient. Taking the steel plate as an example, the width of the steel plate will be slightly smaller than the width of the jaws between the first jaw end 16a and the second jaw end 16b. By way of example only, plates that can be used with the exemplary fracture reduction forceps 10 generally do not exceed 12mm in width, so the width of the jaws can be designed to be 12mm-13mm to facilitate insertion of the plate through the jaws while being restrained by the jaws. certain constraints. It is to be understood that the size of the implant 20 is varied, that is, the size of the implant 20 (including constant or variable length, width, and thickness) can be selected according to the specific needs of the patient, so that it can be The same fracture reduction forceps 10 are designed to be common to various types of implants 20 having various sizes. The implant 20 has a plurality of holes 22 equidistantly spaced along its length, at least some of the plurality of holes 22 in the state where the implant 20 connects the first bone fragment 18a and the second bone fragment 18b. Each is threaded through a corresponding screw, bolt, pin, etc. connector to connect the implant 20 to at least the first bone fragment 18a and the second bone fragment 18b.

The exemplary fracture reduction forceps 10 also includes a compression bolt 24 for temporarily positioning the implant 20 inserted through the jaws. For example, the compression bolt 24 may be threaded to the jaws 16 to extend into the jaws in a direction perpendicular to the first axis and to insert the implant 20 in place with the implant 20 inserted through the jaws The implant 20 applies a fourth pressure, thereby preventing accidental displacement of the implant 20 .

For example, the connecting rod 16c has an internal thread that penetrates the connecting rod 16c in a direction perpendicular to the first axis to lead to the jaws. In addition, the screw 24a of the pressurizing bolt 24 has an external thread matching the internal thread of the connecting rod 16c. The compression bolt 24 can be screwed to the connecting rod 16c in advance before fracture open reduction and internal fixation or similar operations, and in order to ensure the compression effect of the compression bolt 24, the screw rod 24a of the compression bolt 24 extends into the jaws. The length of a portion of the jaws should be equal to or only slightly less than the depth of the jaws extending along the first jaw end 16a or the second jaw end 16b.

Optionally, the exemplary fracture reduction forceps 10 further includes a spacer 26 disposed between the compression bolt 24 and the implant 20 in a state where the compression bolt 24 applies a fourth pressure to the implant 20 . between.

The gasket 26 includes a gasket pressing surface 26 a that abuts against the implant 20 in a state where the pressing bolt 24 applies a fourth pressure to the implant 20 , and the gasket pressing surface 26 a has a much larger area than the pressing bolt 24 The cross-sectional area of the screw 24a is increased, so that the fourth pressure can be distributed more evenly on the implant 20, so that the temporary positioning of the implant 20 is firmer.

Returning to FIG. 1 , since the perimeter of the cross-section of the fractured bone fragment, at least the first bone fragment 18a and the second bone fragment 18b has some curvature, the first surface 20a of the implant 20 that contacts and rests against the bone also It has a certain curvature to ensure the healing effect of fracture reduction. In this case, the second surface of the implant 20, opposite the first surface 20a, is abutted by the pad pressing surface 26a, and may also have some curvature or be flattened, however, the pad of the pad 26 The sheet pressing surface 26a may be designed according to the characteristics of the second surface of the implant 20 to ensure uniform distribution of the fourth pressure on the implant 20 .

Optionally, as shown in FIG. 2 , the implant 20 may be abutted by a spacer pressing surface 26a at a portion of its center, and as shown in FIG. Between two adjacent ones of the holes 22 so as not to obstruct the passage of screws, bolts, pins, etc. connectors through the two holes 22 (if required) to connect the implant 20 to the first bone block 18a or second bone block 18b.

Optionally, the spacer 26 is separable from the compression bolt 24, for example, the spacer 26 also has a direction perpendicular to the first axis in the spacer 26 extending toward the jaws, but does not penetrate the spacer 26 to Connected to the internal threads of the shim compression surface 26a, the inner threads of the shim 26 mate with the outer threads of the threaded rod 24a of the compression bolt 24 to allow compression of fractures prior to open reduction and internal fixation or similar procedures. After the bolt 24 is screwed to the connecting rod 16 c , the pressurizing bolt 24 is screwed to the washer 26 .

Alternatively, the washer 26 may be fixed directly to one end of the threaded rod 24a of the compression bolt 24, in which case the compression bolt 24 would not be removed from the connecting rod 16c, but the compression bolt 24 would be retained. It is always threaded to the connecting rod 16c.

Since the spacer 26 will rotate with the screwing of the pressure bolt 24, the maximum length of the spacer 26 will be slightly smaller than the width of the channel 30b, for example, in the case where the spacer 26 is a rectangular panel, the maximum length of the rectangular panel is the length of the diagonal of the rectangular panel.

Optionally, the pad pressing surface 26a is roughened to increase the friction of the pad pressing surface 26a against the implant 20 to further prevent accidental displacement of the implant 20 .

The example fracture reduction forceps 10 also includes a mechanism for locking the one of the first and second arms 12, 14 to pivot about a first axis relative to the other of the first and second arms 12, 14 The angle of the angle locking mechanism.

Returning to FIG. 1 , the angular locking mechanism optionally includes a first proximal end 12a of the first jaw arm 12 and a second jaw arm 14 pivotably connected about a second axis parallel to the first axis. A hinge post 28 of one of the two proximal ends 14a; and a locking interface 30 formed at the other of the first proximal end 12a of the first jaw arm 12 and the second proximal end 14a of the second jaw arm 14 1 , the hinge post 28 is at least partially formed with a first toothed surface 28a, and the locking interface 30 is at least partially formed with a second toothed surface 30a engageable, eg, substantially complementary, with the first toothed surface 28a (in FIG. 1 ). The second toothed surface 30a has been substantially coincident with the first toothed surface 28a as shown by the dashed line in ). The hinge post 28 is pivotable about the second axis relative to the one of the first proximal end 12a of the first jaw arm 12 and the second proximal end 14a of the second jaw arm 14 toward the locking interface 30 until the first The toothed surface 28a engages the second toothed surface 30a, with the first toothed surface 28a engaging the second toothed surface 30a, the one of the first jaw arm 12 and the second jaw arm 14 relative to the Pivoting of the other of the first jaw arm 12 and the second jaw arm 14 about the first axis will be blocked. By designing the extension of the first toothed surface 28a on the hinge post 28, the one of the first and second jaw arms 12 and 14 can be adjusted relative to the one of the first and second jaw arms 12 and 14 Another angular range of pivoting about the first axis such that within said angular range such pivoting can be blocked at any time by the angular locking mechanism. It will be appreciated that the shape of the hinge post, the first toothed surface, and the second toothed surface may vary.

Taking the example of the hinge post 28 being pivotably connected to the second proximal end 14a of the second jaw arm 14 about the second axis, the angle locking mechanism includes the second proximal end 14a secured to the second jaw arm 14 and defines The hinge shaft 32 or rivet of the second axis to which the hinge post 28 is pivotally connected about the second axis. Additionally, the locking interface 30 includes a channel 30b (shown in FIG. 2 ) through the first proximal end 12a of the first jaw arm 12 along a plane perpendicular to the first axis to facilitate the articulation post 28 moving away from the locking interface about the second axis 30 pivots.

Alternatively, the angle locking mechanism includes a hinge post pivotally connected about a third axis to one of the first proximal end 12a of the first jaw arm 12 and the second proximal end 14a of the second jaw arm 14 28, the third axis is perpendicular to the first axis and perpendicular to the extension of the hinge post 28; Locking interface 30 at the other. In this case, the hinge post 28 will pivot at an angle relative to a plane perpendicular to the first axis. The locking interface 30 may be integrally formed with the other of the first proximal end 12a of the first jaw arm 12 and the second proximal end 14a of the second jaw arm 14 .

Additionally, a first spring mechanism may be provided about the hinge shaft 32 or a spring leaf may be secured on a rivet to bias the hinge post 28 to tend to pivot toward the locking interface 30 about the second or third axis.

Additionally, for operator convenience, a second spring mechanism may be provided about the pivot axis 15 to bias the one of the first and second jaw arms 12, 14 toward moving away from the first and second jaw arms 12, 14 The other of the arms 14 pivots.

It can be understood that the configuration of the angle locking mechanism is various.

Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustration only and not for limiting the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims (10)

1. A fracture reduction forceps (10) comprising a pivot shaft (15) defining a first axis, a first forceps arm (12), and a second forceps arm (14), wherein the first forceps arm (12) and one of the second gripper arms (14) is pivotably connected to the other of the first gripper arm (12) and the second gripper arm (14) by means of a pivot shaft (15) about a first axis, characterized by That is, the fracture reduction forceps (10) further comprises: A jaw (16) secured to the distal end of the first jaw arm (12), the jaw (16) comprising a first jaw end (16a), a second jaw end (16b), and a first jaw end (16b) A jaw formed between (16a) and a second jaw end (16b), wherein the first jaw end (16a) is configured for placement at the first bone fragment (18a), the second jaw end (16b) being configured for placement at a second bone fragment (18b) fractured from the first bone fragment (18a), and the jaws are configured for connecting the first bone fragment (18a) and the second bone Insert (20) of block (18b) inserted therethrough; and A compression bolt (24) configured to be adapted to be threaded into the jaws (16) to extend into the jaws in a direction perpendicular to the first axis, and in the insertion Pressure is applied to the implant (20) in a state where the implant (20) is inserted through the jaws. 2. The fracture reduction forceps (10) according to claim 1, characterized in that, the jaws (16) further comprise a connecting rod (16c), and both ends of the connecting rod (16c) are respectively connected to the first A claw end (16a) and a second claw end (16b), and the connecting rod (16c) has an internal thread penetrating the connecting rod (16c) in a direction perpendicular to the first axis to lead to the jaws , the screw (24a) of the pressing bolt (24) has an external thread matching the internal thread of the connecting rod (16c). 3. The fracture reduction forceps (10) according to claim 2, further comprising a spacer (26), the spacer (26) being configured to be inserted into the compression bolt (24) toward the The object (20) is provided between the pressing bolt (24) and the insertion object (20) in a state where pressure is applied. 4 . The fracture reduction forceps ( 10 ) according to claim 3 , wherein the washer ( 26 ) comprises a force against which the compression bolt ( 24 ) applies pressure to the implant ( 20 ). 5 . The area of the shim pressing surface (26a) against the insert (20) is larger than the cross-sectional area of the screw (24a). 5. The fracture reduction forceps (10) according to claim 4, wherein the washer (26) and the compression bolt (24) are separable or fixed to one end of the screw rod (24a) . 6. The fracture reduction forceps (10) according to claim 4 or 5, characterized in that the pad pressing surface (26a) is roughened to increase the pad pressing surface (26a) against the set The frictional force of the incoming object (20). 7. The fracture reduction forceps (10) according to any one of claims 1 to 5, further comprising an angle locking mechanism configured to lock the first forceps arm (12) and the second forceps The angle at which one of the arms (14) pivots about the first axis relative to the other of the first and second jaw arms (12, 14). 8. The fracture reduction forceps (10) according to claim 7, wherein the angle locking mechanism comprises: a proximal end pivotally connected to the first forceps arm (12) about a second axis and the second forceps a hinge post (28) of one of the proximal ends of the arms (14); and a hinge post (28) formed at the other of the proximal end of the first clamp arm (12) and the proximal end of the second clamp arm (14) A locking interface (30) wherein the hinge post (28) is at least partially formed with a first toothed surface (28a) and the locking interface (30) is at least partially formed with a first toothed surface (28a) engageable The second toothed surface (30a). 9. The fracture reduction forceps (10) according to claim 8, wherein the angle locking mechanism comprises fixing into the proximal end of the first forceps arm (12) and the proximal end of the second forceps arm (14) a hinge shaft (32) that defines a second axis and a spring mechanism arranged around the hinge shaft (32), the hinge post (28) is pivotally connected to the hinge shaft (32) about the second axis so that the spring The mechanism biases the hinge post (28) to tend to pivot about the second axis toward the locking interface (30), and the locking interface (30) includes a proximal side extending through the first jaw arm (12) along a plane perpendicular to the first axis End channel (30b). 10. The fracture reduction forceps (10) according to claim 8, wherein the angle locking mechanism comprises fixing into the proximal end of the first forceps arm (12) and the proximal end of the second forceps arm (14) One of the rivets and defining a second axis, and a leaf spring fixed to the rivet, the hinge post (28) is pivotally connected to the rivet about the second axis such that the leaf spring biases the hinge post (28) to tend to around the second axis. The second axis pivots toward the locking interface (30), and the locking interface (30) includes a channel (30b) extending through the proximal end of the first jaw arm (12) along a plane perpendicular to the first axis.

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