CN203609466U - Linear stitching and cutting apparatus - Google Patents

Abstract

The utility model provides a linear stitching and cutting apparatus, which comprises an upper clamp, a lower clamp, a staple cartridge, a percussion sheet and a cutter pushing bar. The near end of the percussion sheet and the near end of the cutter pushing bar are connected with a single slide block used for driving the percussion sheet and the cutter pushing bar to move. A safety mechanism is arranged between the percussion sheet and the lower clamp. The safety mechanism at least comprises a lower safety block and the lower safety block is provided with a limiting convex block. When the linear stitching and cutting apparatus is in an initial state in that the staple cartridge is not yet installed onto the lower clamp, the limiting convex block is arranged on the movement path of the percussion sheet. The lower surface of the staple cartridge is provided with a boss used for extruding the limiting convex block to push away the limiting convex block from the movement path of the percussion sheet. According to the technical scheme of the utility model, the safety mechanism of the linear stitching and cutting apparatus is structurally simple, convenient to machine, safe and reliable. Therefore, the linear stitching and cutting apparatus has good market popularization value.

Description

Linear Seam Cutter

technical field

The utility model relates to a linear seam cutter, which belongs to the technical field of medical instruments.

Background technique

Linear sewing cutters are widely used in surgical operations for wound suturing, internal tissue suturing and cutting. Typical linear sewing cutters, as disclosed in U.S. Patent No. 5,129,570, have two functions of suturing and cutting. At the same time, excess tissue is removed. This type of linear seam cutter generally includes upper and lower jaws, and a closing handle for closing the upper and lower jaws. The firing piece inside the magazine and capable of moving relative to the staple magazine at the same time, the push knife rod with a cutter at the far end, and the push button for driving the movement of the firing piece and the push knife rod. Staples are arranged in the staple cartridge, the firing piece sequentially pushes the staple pushers and pushes the staples to the anvil, and the cutter cuts off the tissue located between the staple cartridge and the anvil.

In the prior art, the staple cartridge of the linear seam cutter can be replaced and used for many times. During clinical use, multiple suturing and cutting tissues are often required, so the staple cartridge needs to be replaced multiple times during the operation. In the case of not putting in the staple cartridge, the push button can be pushed forward arbitrarily, and then the cutting knife will be pushed out, which will cause serious consequences of only cutting but not suturing. Therefore, a kind of safety mechanism is all arranged on the linear seam cutter of the prior art.

U.S. Patent No. US5129570 discloses a safety mechanism. A safety block with a cutter channel and a firing piece channel is arranged in the middle of the instrument, and a shrapnel is arranged under the cutter. When the instrument is in the open position (that is, the upper and lower jaws are not closed), the shrapnel bounces the cutter so that the cutter cannot pass through the cutter channel, which plays a role of insurance; After the next two jaws are closed, the staple magazine presses the top of the cutter, so that the cutter overcomes the elastic force of the shrapnel and returns to the state aligned with the cutter channel. At this time, the safety is released and the instrument can be used for firing.

U.S. Patent No. US7055730 discloses another safety mechanism, in which a safety block with a channel for a pusher rod and a passage for a firing sheet is arranged in the middle of the instrument, and the safety block can rotate around the instrument under the action of a torsion spring. When the instrument is in the open position (that is, the upper and lower jaws are not closed), the safety block is twisted, so that neither the firing piece nor the push knife rod can pass through the passage, which plays a role of insurance; , After the lower two jaws are closed, the nail magazine presses the safety block to overcome the elastic force of the torsion spring and return to the normal position (that is, the firing piece and the push knife rod are respectively aligned with the channels on the safety block), so that the firing piece and the push knife All rods can pass through the safety block, and at this moment the safety is released, and the apparatus can be fired and used.

The above several structures are all relatively complicated, difficult to process and assemble, and expensive.

Utility model content

The purpose of this utility model is to propose a linear seam cutter with a safety mechanism of simple structure.

The purpose of this utility model will be achieved through the following technical solutions:

A linear slit cutter, comprising: upper and lower jaws that can be closed or opened mutually, the distal end of the lower jaws is provided with a staple cartridge; There is a firing piece and a push knife rod with a cutting knife installed on the far end. The proximal ends of the firing piece and the pushing knife rod are connected to the same slider for driving the movement of the two. The firing piece and the lower jaw There is a safety mechanism between them, the safety mechanism at least includes a lower safety block fixed on the lower jaw, and the lower safety block includes a limit projection, when the linear seam cutter is in the When the staple cartridge is installed to the initial state on the lower jaw, the limit protrusion is arranged on the moving route of the firing piece; the lower surface of the staple cartridge is provided with a The protrusion pushes the limiting protrusion away from the protrusion of the moving route of the firing piece.

Preferably, the firing piece includes a connecting piece, and when the linear seam cutter is in an initial state where the staple cartridge is not installed on the lower jaw, the limiting protrusion is stuck on the connecting piece. on the distal face.

Preferably, the lower jaw is provided with an opening for the limit protrusion to pass through. When the linear seam cutter is in the initial state where the staple cartridge is not installed on the lower jaw, the The limiting protrusion passes through the opening and is clamped on the distal surface of the connecting piece.

Preferably, the lower safety block includes at least one body, the limiting protrusion is relatively far away from the body, and the body and the limiting protrusion are connected by a flexible connecting arm.

Preferably, a hook is provided on the body of the lower safety block, and a matching groove is provided on the upper safety block.

Preferably, the safety mechanism further includes an upper safety block arranged in the lower jaw, the upper safety block and the lower safety block are fixed to each other, and the flexible connecting arm of the lower safety block is closely attached to the lower safety block. The underside of the clamp.

Preferably, the lower jaw is provided with an opening for the at least one body to pass through.

Preferably, a limiting block is provided on the outer side of the body.

Preferably, the upper safety block is provided with a channel for the push rod to pass through.

Preferably, the pusher rod includes a step, and when the pusher rod is reset to the initial state of the linear seam cutter, the step interferes with the distal end surface of the channel of the upper safety block.

The beneficial effects of the utility model are mainly reflected in that the insurance mechanism is simple in structure, convenient in processing, safe and reliable, and has good market promotion value.

Description of drawings

Fig. 1 is an explosion schematic diagram of the lower jaw of the present invention.

Fig. 2 is a three-dimensional schematic view of the lower jaw of the present invention when no staple cartridge is installed.

Fig. 3 is a top view of the lower jaw of the present invention when no staple cartridge is installed.

Fig. 4 is a sectional view along C-C direction in Fig. 3 .

Fig. 4a is an enlarged view of part A in Fig. 4 .

Fig. 5 is a cross-sectional view of the lower jaw of the present invention after the nail cartridge is installed.

Fig. 5a is an enlarged view of part B in Fig. 5 .

Fig. 6 is an enlarged schematic view of the upper safety block of the present invention.

Detailed ways

As shown in Figure 1, the utility model provides a safety mechanism for a linear seam cutter. Consistent with the prior art, the linear seam cutter includes a plastic shell, upper and lower jaws that can be closed or opened mutually, the distal end of the upper jaws is provided with an anvil (not shown), and the lower jaws The distal end of the 1 is provided with a staple cartridge 2. Of course, the positions of the upper and lower clamps can be interchanged, and the utility model is defined in this way for the sake of clarity.

The lower jaw 1 is ∪-shaped, and a firing piece 3 and a pusher rod 5 with a cutting knife 4 installed at the far end are arranged therein so as to be movable relative to the staple bin 2. The firing piece 3 and the pusher rod 5 are The proximal ends of both are connected to the same slide block 6 for driving both of them to move. When in use, put the tissue between the anvil and the staple bin, then close the upper and lower jaws, close the handle, make the upper and lower jaws clamp the tissue, and then push the firing push button set at the proximal end of the upper and lower jaws , the slide block 6 connected with the firing push button drives the firing piece 3 and the push knife rod 5 to implement suturing and cutting of tissues.

The utility model is characterized in that: a safety mechanism is provided between the firing piece 3 and the lower jaw 1 of the linear slit cutter. The safety mechanism includes an upper safety block 7 and a lower safety block 8 fixed to each other, and both the upper safety block 7 and the lower safety block 8 are fixed on the lower jaw 1, and the lower safety block 8 includes a limit position The protruding block 81, the lower jaw is provided with an opening 11 for the limiting protruding block 81 to pass through. When the linear seam cutter is in an initial state where the staple cartridge 2 is not installed on the lower jaw 1 , the limiting protrusion 81 is arranged on the moving route of the firing piece 3 .

As shown in FIG. 2, FIG. 3, FIG. 4 and FIG. 4a, the firing piece 3 includes a connecting piece 31. state, the limiting protrusion 81 passes through the opening 11 and is stuck on the distal surface of the connecting piece 31 . In this way, when the linear seam cutter is in the initial state where the staple cartridge 2 is not installed on the lower jaw 1, the limiting protrusion 81 limits the movement of the firing piece 3, which plays a role of insurance.

Specifically, the lower safety block 8 includes at least one body 80 . In this preferred embodiment, the body is a flat block with two parallel blocks arranged on both sides of the limiting protrusion 81 . The limiting protrusion 81 is relatively far away from the main body 80 , and the main body 80 and the limiting protrusion 81 are connected by a flexible connecting arm 82 . The body 80 of the lower safety block 8 is provided with a hook 83 , and the upper safety block 7 is provided with a corresponding matching groove 71 .

The lower jaw 1 is also provided with at least one opening corresponding to the main body 80 for the passage of the main body 80 . Compared with the opening for the passage of the limiting protrusion 81 , the at least one opening is located at The nearer side of the lower jaw 1. The side of the body 80 of the lower safety block 8 is also provided with a limit block 84, the limit block 84 can pass through the corresponding opening on the lower jaw and clamp the lower safety block 8 on the lower jaw. Clip 1 on.

When installing the safety mechanism, the lower safety block 8 is first loaded into the lower jaw 1 through the corresponding opening at the bottom of the lower jaw 1, and the limit block 84 clamps the lower safety block 8 on the lower jaw 1; The hook 83 extends into the lower jaw 1 , and then the upper safety block 7 is snapped into the hook 83 . In this way, both the upper and lower safety blocks are fixed in the lower jaw 1 . After the upper safety block 7 and the lower safety block 8 are fixed, the flexible connecting arm 82 of the lower safety block 8 is tightly attached to the bottom surface 12 of the lower jaw 1 .

As shown in Fig. 5 and Fig. 5a, the lower surface of the staple cartridge 2 is provided with a moving route for pressing the limiting protrusion 81 and pushing the limiting protrusion 81 away from the firing piece 3 The boss 21. When the staple cartridge 2 is installed, the boss 21 presses the limiting protrusion 81 so that the limiting protrusion 81 is out of the moving route of the firing piece 3 . At this time, the insurance is released, and the sewing and cutting can be performed freely.

As shown in FIG. 6 , the upper safety block 7 is provided with a channel 72 for the push rod 5 to pass through. The push knife rod 5 includes a step 51, and when the push knife rod 5 is reset to the initial state of the linear seam cutter, the step 51 and the distal end surface of the channel 72 of the upper safety block 7 73 interferes, so that the pusher bar 5 returns to the initial position without being excessively reset, so that when a new staple cartridge is replaced, the cutter cooperates with the pusher bar.

The proximal end in the present invention refers to the end close to the operator, on the contrary, the far end is the end away from the operator. The utility model still has multiple implementation modes, and all technical solutions formed by equivalent transformation or equivalent transformation all fall within the protection scope of the utility model.

Claims (10)

1. A linear seam cutter, comprising: upper and lower jaws that can be closed or opened mutually, the far end of the lower jaws (1) is provided with a staple bin (2); A firing piece (3) and a pusher bar (5) with a cutting knife (4) installed at the far end are movable relative to the staple bin (2), and the firing piece (3) and the pusher bar (5) The proximal ends are all connected to the same slider (6) for driving the two to move, and it is characterized in that: a safety mechanism is arranged between the firing piece (3) and the lower jaw (1), and the safety mechanism The mechanism at least includes a lower safety block (8) fixed on the lower jaw (1), and the lower safety block (8) includes a limit projection (81), when the linear seam cutter is in When the staple cartridge (2) is not installed to the initial state on the lower jaw (1), the limit projection (81) is arranged on the moving route of the firing piece (3); the staple cartridge ( 2) is provided with a boss (21) on the lower surface for squeezing the limit projection (81) and pushing the limit projection (81) away from the moving route of the firing piece (3) . the 2. The linear seam cutter according to claim 1, characterized in that: the firing piece (3) includes a connecting piece (31), when the linear seam cutter is not installed with the staple cartridge ( 2) When reaching the initial state on the lower jaw (1), the limiting protrusion (81) is stuck on the distal end surface of the connecting piece (31). the 3. The linear seam cutter according to claim 2, characterized in that: the lower jaw (1) is provided with an opening (11) for the passage of the limiting protrusion (81), when When the linear seam cutter is in the initial state where the staple cartridge (2) is not installed on the lower jaw (1), the limiting protrusion (81) passes through the opening (11) and is stuck on the lower jaw (1). The far end face of the connecting piece (31). the 4. The linear seam cutter according to claim 1, characterized in that: the lower safety block (8) includes at least one body (80), and the limiting protrusion (81) is relatively far away from the body ( 80), the body (80) and the limit projection (81) are connected through a flexible connecting arm (82). the 5. The linear seam cutter according to claim 4, characterized in that: the safety mechanism also includes an upper safety block (7) arranged in the lower jaw (1), and the upper safety block (7) The block (7) and the lower safety block (8) are fixed to each other, the body (80) of the lower safety block (8) is provided with a hook (83), and the upper safety block (7) is provided with a relatively matching groove (71). the 6. The linear seam cutter according to claim 5, characterized in that: the flexible connecting arm (82) of the lower safety block (8) is tightly attached to the bottom surface (12) of the lower jaw (1) . the 7. The linear seam cutter according to claim 6, characterized in that: the lower jaw (1) is provided with an opening for the at least one body (80) to pass through. the 8. The linear seam cutter according to claim 7, characterized in that: a limiting block (84) is provided on the outer side of the body (80). the 9 . The linear seam cutter according to claim 5 , characterized in that: the upper safety block ( 7 ) is provided with a channel ( 72 ) for passing the pusher rod ( 5 ). the 10. The linear seam cutter according to claim 9, characterized in that: the push knife rod (5) includes a step (51), when the push knife rod (5) returns to the linear seam In the initial state of the cutter, the step (51) interferes with the distal end surface (73) of the channel (72) of the upper safety block (7). the

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