CN110547854B

CN110547854B - Knife rest and cutting anastomat thereof

Info

Publication number: CN110547854B
Application number: CN201810562097.3A
Authority: CN
Inventors: 孙宝峰; 张志星
Original assignee: Fengh Medical Co ltd
Current assignee: Fengh Medical Co ltd
Priority date: 2018-05-31
Filing date: 2018-05-31
Publication date: 2022-02-18
Anticipated expiration: 2038-05-31
Also published as: CN110547854A

Abstract

The invention discloses a knife rest and a cutting anastomat thereof, wherein the knife rest comprises an accommodating space, a first accommodating part and a second accommodating part, wherein the first accommodating part is provided with a sliding limiting groove; the sliding limiting groove is provided with a bottom surface, a first side surface and a second side surface which are opposite, the joint of the first side surface and the bottom surface is defined as a first corner part, and the joint of the second side surface and the bottom surface is defined as a second corner part; the mandrel is accommodated in the accommodating space, and the distal end of the mandrel enters the sliding limiting groove; the mandrel is provided with an outer surface, a first gap portion is arranged between the first corner portion and the outer surface, and a second gap portion is arranged between the second corner portion and the outer surface. According to the tool rest provided by the invention, the clearance part is arranged between the corner part of the sliding limiting groove and the outer surface of the mandrel, so that the contact area between the outer surface of the mandrel and the sliding limiting groove is reduced, and the friction force of the mandrel in the reciprocating movement process in the tool rest is reduced.

Description

Knife rest and cutting anastomat thereof

Technical Field

The invention relates to a surgical operation device, in particular to a knife rest, a knife rest assembly and a cutting anastomat thereof, and belongs to the field of medical instruments.

Background

The cutting anastomat is a common surgical operation instrument, can simultaneously complete cutting and suturing actions, greatly saves the operation time of doctors, reduces the amount of bleeding and improves the success rate of the operation. Based on the above advantages, the cutting stapler is widely used in open or minimally invasive general surgery, obstetrics and gynecology, urology surgery, thoracic surgery and pediatric surgery.

FIG. 1 is an assembled schematic view of a knife carriage assembly in a prior art cutting stapler; FIG. 2 is an exploded view of the carriage assembly of FIG. 1; fig. 3 is a schematic cross-sectional view taken along the dotted line a in fig. 1. Wherein the cutting knife in fig. 2 is omitted in fig. 3.

As shown in fig. 1 to 3, the tool holder assembly includes a tool holder 10, a mandrel 20 and a cutting knife 30 accommodated in an accommodating space 11 of the tool holder 10, wherein an end of the mandrel 20 is detachably combined with an end of the cutting knife 30, a limiting sliding groove 12 is disposed in the accommodating space 11, a portion of the mandrel 20 is accommodated in the limiting sliding groove 12 and can reciprocate in the limiting sliding groove 12, and the limiting sliding groove 12 is used for preventing the mandrel 20 from shifting in the reciprocating process. The limiting chute 12 includes a bottom surface 121, a first side surface 122 and a second side surface 123 opposite to the bottom surface 121, and the two

opposite side surfaces

122 and 123 are respectively arc-shaped structures, wherein the bottom surface 121, the first side surface 122 and the second side surface 123 opposite to each other form a gentle arc-shaped concave portion, and the arc-shaped concave portion is matched with the annular outer surface 21 of the mandrel 20.

As shown in fig. 3, the contact between the arc-shaped concave portion and the outer surface 21 of the mandrel 20 is "surface contact", the outer surface 21 is an annular surface adapted to the arc-shaped concave portion, and during the reciprocating movement of the mandrel 20, the contact area between the annular outer surface 21 and the arc-shaped concave portion is large, and the sliding resistance is significant. In addition, in the prior art, the limiting sliding groove 12 is manufactured by using a deep hole drill, so that the precision requirement on a deep hole drill machine table is high, and further the production cost of the tool rest 10 is increased.

In view of the above problems, the present invention provides a new tool holder structure, which reduces the resistance generated by the reciprocating movement of the mandrel; meanwhile, the manufacturing process of the limiting sliding groove of the tool rest structure is changed, so that the purpose of reducing the production cost of the tool rest is achieved.

Disclosure of Invention

The invention aims to provide a novel tool rest and a cutting anastomat thereof, and particularly aims to improve the structure of a sliding limiting groove in the tool rest, improve the actuation stability of a mandrel in the tool rest and reduce the manufacturing cost of the tool rest.

The invention provides a knife rest which is used for cutting an anastomat, and comprises an accommodating space, a first knife rest and a second knife rest, wherein the accommodating space is provided with a first accommodating part and a second accommodating part which are communicated with each other; the sliding limiting groove is provided with a bottom surface, a first side surface and a second side surface which are opposite, the joint of the first side surface and the bottom surface is defined as a first corner part, and the joint of the second side surface and the bottom surface is defined as a second corner part; the mandrel is accommodated in the accommodating space, and the far end of the mandrel enters the sliding limiting groove; the mandrel is provided with an outer surface, a first gap part is arranged between the first corner part and the outer surface, and a second gap part is arranged between the second corner part and the outer surface.

As an optional technical solution, the bottom surface, the first side surface and the second side surface are respectively of a planar structure.

As an optional technical solution, the bottom surface, the first side surface and the second side surface are tangent to the outer surface respectively.

As an alternative solution, the outer surface is an annular surface.

As an alternative solution, the first corner portion and the second corner portion are a right angle, a rounded angle, an acute angle or an obtuse angle.

As an optional technical solution, the height of the first side surface and/or the height of the second side surface is larger than the radius of the mandrel.

As an optional technical solution, the height of the first side surface and/or the height of the second side surface are 2.28 mm to 3.8 mm, respectively.

As an optional technical solution, the height of the first side surface is equal to or different from the height of the second side surface.

As an optional technical solution, the sliding limiting groove is formed by milling with a milling cutter.

As an optional technical solution, the accommodating space further has a second accommodating portion, and the second accommodating portion is communicated with the first accommodating portion; the first receiving portion has a first radial width, the second receiving portion has a second radial width, and the first radial width is greater than the second radial width.

The invention further provides a cutting anastomat, which comprises a knife rest and a mandrel, wherein the mandrel is received in the accommodating space of the knife rest, and the knife rest is the knife rest according to any one of claims 1 to 10.

Compared with the prior art, the tool rest provided by the invention has the advantages that the clearance part is arranged between the corner part of the sliding limiting groove and the outer surface of the mandrel, so that the contact area between the outer surface of the mandrel and the sliding limiting groove is reduced, and the friction force of the mandrel in the reciprocating movement process in the tool rest is reduced. In addition, the height of the side surface of the sliding limiting groove is increased, so that the limiting capacity of the sliding limiting groove on the reciprocating movement of the mandrel is improved, and the reciprocating movement stability of the mandrel is improved; furthermore, due to the improvement of the structure of the sliding limiting groove, the sliding limiting groove can be formed by milling through a milling cutter, the precision of the sliding limiting groove is easier to realize, the production cost is reduced, and the industrial manufacturing is facilitated.

Drawings

FIG. 1 is an assembled schematic view of a prior art tool holder assembly;

FIG. 2 is an exploded view of the carriage assembly of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along the dotted line A in FIG. 1;

FIG. 4 is a schematic view of the construction of the tool holder of the present invention;

FIG. 5 is an assembled schematic view of the carriage assembly of the present invention;

fig. 6 is a schematic sectional view taken along the dashed line B in fig. 5.

Fig. 7A-7C are cross-sectional schematic views of a toolholder assembly in other embodiments of the invention.

Fig. 8 is a schematic view of a partial structure of the tool holder of the present invention.

Fig. 9 is a schematic view of another partial structure of the tool holder of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

FIG. 4 is a schematic view of the construction of the tool holder of the present invention; FIG. 5 is an assembled schematic view of the carriage assembly of the present invention; fig. 6 is a schematic sectional view taken along the dashed line B in fig. 5. In fig. 6, the cutting blade of fig. 5 is omitted.

As shown in fig. 4 to 6, the tool holder 100 has an accommodating space 101, the mandrel 20 is accommodated in the accommodating space 101, the mandrel 20 is detachably connected to the cutting blade 30, and the cutting blade 30 is partially accommodated in the accommodating space 101, wherein the accommodating space 101 includes a first accommodating portion 101a and a second accommodating portion 101b that are communicated with each other, the first accommodating portion 101a has an opening such that the first accommodating portion 101a is a "U-shaped" accommodating groove for accommodating a portion of the distal end regions of the cutting blade 30 and the mandrel 20, the first accommodating portion 101a has a first radial width W35 1 (as shown in fig. 8), and the first radial width W1 is greater than the outer diameter of the mandrel 20; the second receiving portion 101b is a closed circular receiving groove, the circular receiving groove penetrates along the axial direction of the tool holder 100 and is used for receiving the proximal end region of the mandrel 20, the second receiving portion 101b has a second radial width W2 (as shown in fig. 9), and the second radial width W2 is slightly larger than the outer diameter of the mandrel 20, so that the mandrel 20 can smoothly reciprocate in the second receiving portion 101 b. In this embodiment, the first radial width W1 is greater than the second radial width W2. Further, for convenience, taking a cutting stapler as an example, the side closer to the operator is defined as the proximal end, and the side farther from the operator is defined as the distal end.

A sliding position-limiting groove 102 is formed in the first accommodating portion 101a, the sliding position-limiting groove 102 is located in a middle region of the first accommodating portion 101a, wherein the sliding position-limiting groove 102 has a bottom surface 105 and a first side surface 103 and a second side surface 104 which are parallel and opposite to each other, the first side surface 103 and the second side surface 104 are respectively connected to the bottom surface 105, a connection position between the first side surface 103 and the bottom surface 105 is defined as a first corner portion 102a, and a first gap portion 106 is formed between the first corner portion 102a and the outer surface 21 of the mandrel 20; the junction between the second side surface 104 and the bottom surface 105 is defined as a second corner 102b, and a second gap 107 is formed between the second corner 102b and the outer surface 21 of the mandrel 20. The first clearance part 106 and the second clearance part 107 enable the contact between the outer surface 21 of the mandrel 20 and the sliding limiting groove 102 to be changed from the surface contact shown in fig. 3 to the point contact shown in fig. 6, so that the contact area between the sliding limiting groove 102 and the outer surface 21 of the mandrel 20 is reduced, the friction force when the mandrel 20 moves back and forth in the sliding limiting groove 102 is reduced, the resistance of the cutting anastomat in-and-out operation is further reduced, and the operation hand feeling of a doctor is improved.

In this embodiment, the sliding limiting groove 102 and the body of the tool holder 100 are integrally formed, that is, a solid metal cylinder is milled by a milling cutter to form the first accommodating portion 101a and the sliding limiting groove 102, wherein for convenience of describing the invention, the sliding limiting groove 102 and the body of the tool holder 100 are described differently, but not limited thereto. With continued reference to fig. 6, the first and

second corner portions

102a and 102b respectively form a first and

second gap portions

106 and 107 with the corresponding outer surface 21, and compared with the sliding limiting groove 12 in the prior art (as shown in fig. 3), the sliding limiting groove 102 of the present invention can be regarded as reducing the "thickness" of the first and

second corner portions

102a and 102b, i.e., the first and

second corner portions

102a and 102b are formed by removing the material originally occupied by the first and

second gap portions

106 and 107, and the machining manner of the sliding limiting groove 102 in the present invention is changed due to the "thickness" reduction, i.e., the sliding limiting groove 102 can be formed by "milling" machining through "deep hole drilling" in the prior art. Compared with a deep hole drilling machining mode, the machining mode of milling by the milling cutter enables the machining precision of the sliding limiting groove 102 to be controlled more easily, and machining cost is greatly reduced. The deep hole drilling mode is that a drill bit enters the inside of the tool rest to drill, the tool rest is long, high coaxiality needs to be guaranteed in the drilling process, higher requirements are necessarily provided for the whole drilling device, and therefore the machining cost is increased. In this embodiment, for the convenience of processing and the requirement of reducing friction, the "thickness" of the first corner 102a and the second corner 102b is completely removed, but not limited thereto. In other embodiments of the present invention, the first corner 102a and the second corner 102b may be partially removed, i.e., only the first corner 102a and the second corner 102b need to be free from contact with the outer surface 21 of the mandrel 20.

In addition, since the first radial width W1 of the first accommodating portion 101a is greater than the second radial width W2 of the second accommodating portion 101b, the mandrel 20 is prevented from shaking in the horizontal direction during the reciprocating movement in the first accommodating portion 101a, that is, the mandrel 20 is prevented from shaking in the radial direction thereof, and the stability of the reciprocating movement of the mandrel 20 is improved, the mandrel 20 has a radius r2, the first side surface 103 and the second side surface 104 have a height h2, respectively, and the height h2 is greater than the radius r2, wherein the heights of the first side surface 103 and the second side surface 104 are equal, but not limited thereto. In other embodiments of the present invention, the heights of the first side surface 103 and the second side surface 104 may not be the same. Preferably, the height h2 of the first side 103 and the second side 104 is 2.28 mm to 3.8 mm, respectively, to ensure that the mandrel 20 does not wobble horizontally during reciprocating movement and also does not interfere with other components, such as the tool holder cover. As shown in fig. 3, the radius r1 of the core shaft 20 of the existing cutting stapler is larger than the height h1 of the first side surface 122 and the second side surface 123, and the function of limiting the core shaft 20 by the sliding limiting groove 12 is small, wherein the height h1 is defined as the vertical distance from the center of the bottom surface 121 to the top end of the first side surface 122 or the second side surface 123. Therefore, compared to the design of the sliding-limiting groove in fig. 1 to 3, the present invention achieves the improvement of the moving stability of the mandrel 20 by extending the height h1 of the first side surface 103 and the second side surface 104 so that the sliding-limiting groove 102 better limits the offset of the mandrel 20 during the reciprocating movement. Specifically, in the conventional cutting stapler, the mandrel 20 and the position-limiting sliding groove 12 of the tool holder 10 only act on a partial area of the bottom of the mandrel 20, so that the mandrel 12 slides in the accommodating space 11 easily to generate radial deviation, which results in poor stability of the reciprocating movement of the mandrel 12, and the position-limiting sliding groove 12 is in surface contact with the bottom of the mandrel 12, which results in large frictional resistance of the reciprocating movement of the mandrel 12. In the tool holder 100 provided in the present invention, the contact manner of the mandrel 20 in the sliding limiting groove 102 is changed from the original surface contact to the point contact, that is, the first side surface 103, the second side surface 104 and the bottom surface 105 of the sliding limiting groove 102 are respectively tangent to the outer surface 21 of the mandrel 20, so that the first side surface 103, the second side surface 104 and the bottom surface 105 of the sliding limiting groove 102 respectively form the "three-point contact" with the outer surface 21 of the mandrel 20, and the "three-point contact" can more effectively limit the radial offset of the mandrel 20. Further, the "point contact" reduces the contact area between the outer surface 21 of the spindle 20 and the slide retaining groove 102, so that the resistance to the reciprocation of the spindle 20 becomes small. In this embodiment, the height h2 of the first side surface 103 and the second side surface 104 is preferably configured to be greater than the radius r2 of the core shaft 20, so as to ensure that the first side surface 103, the second side surface 104 and the bottom surface 105 of the sliding limiting groove 102 are respectively tangent to the outer surface 21 of the core shaft 20; in other words, the height h2 of the first side surface 103 and the second side surface 104 is greater than the radius r2 of the mandrel 20, and the first side surface 103, the second side surface 104 and the bottom surface 105 are respectively tangent to the outer surface 21 of the mandrel 20, so that the mandrel 20 is effectively limited from moving radially between the first side surface 103 and the second side surface 104, and the stability of the mandrel 20 is improved. The heights h2 of the first side 103 and the second side 104 may be the same or different, respectively, and need only be larger than the radius r2 of the mandrel 20.

In this embodiment, the first side surface 103, the second side surface 104 and the bottom surface 105 are respectively a plane structure, and preferably, the first corner portion 102a and the second corner portion 102b are respectively a right angle, but not limited thereto. In other embodiments of the present invention, as shown in fig. 7A, the first corner 102a 'and the second corner 102 b' may also be rounded; alternatively, as shown in fig. 7B, the first corner portion 102a "and the second corner portion 102B" may also be obtuse angles; as shown in fig. 7C, the first corner 102a '"and the second corner 102 b'" may be acute angles. The cross section of the first corner 102a and the second corner 102b may be curved or straight.

The invention also provides a cutting anastomat which is provided with the knife rest 100.

In addition, the cross-sectional shape of the outer surface 21 of the mandrel 20 is a major arc, the mandrel 20 is assembled into the tool holder 100, and the distal end region of the mandrel 20 enters the slide retaining groove 102 of the tool holder 100, wherein the first side surface 103, the second side surface 104, and the bottom surface 105 of the slide retaining groove 102 are respectively tangent to the outer surface 21 of the mandrel 20, so that the first side surface 103, the second side surface 104, and the bottom surface 105 of the slide retaining groove 102 are respectively in "point contact" with the outer surface 21 of the mandrel 20.

In summary, in the tool holder provided by the present invention, the clearance portion is provided between the corner portion of the sliding limiting groove and the outer surface of the mandrel, so that the contact area between the outer surface of the mandrel and the sliding limiting groove is reduced, and the friction force of the mandrel during the reciprocating movement in the tool holder is reduced. In addition, the height of the side surface of the sliding limiting groove is increased, so that the limiting capacity of the sliding limiting groove on the reciprocating movement of the mandrel is improved, and the reciprocating movement stability of the mandrel is improved; furthermore, due to the improvement of the structure of the sliding limiting groove, the sliding limiting groove can be formed by milling through a milling cutter, the precision of the sliding limiting groove is easier to realize, the production cost is reduced, and the industrial manufacturing is facilitated.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A knife rest used for cutting a anastomat is characterized in that,

the tool rest comprises an accommodating space, the accommodating space is provided with a first accommodating part, and the first accommodating part is provided with a sliding limiting groove; the sliding limiting groove is provided with a bottom surface, a first side surface and a second side surface which are opposite, the joint of the first side surface and the bottom surface is a first corner part, and the joint of the second side surface and the bottom surface is a second corner part;

when the mandrel is accommodated in the accommodating space, the far end of the mandrel enters the sliding limiting groove; the mandrel is provided with an outer surface, a first gap part is arranged between the first corner part and the outer surface, and a second gap part is arranged between the second corner part and the outer surface; the accommodating space is also provided with a second accommodating part which is communicated with the first accommodating part; the first receiving portion has a first radial width, the second receiving portion has a second radial width, and the first radial width is greater than the second radial width.

2. The toolholder according to claim 1, wherein the bottom surface, the first side surface and the second side surface are each planar in configuration.

3. The toolholder according to claim 1, wherein the bottom surface, the first side surface and the second side surface are each tangent to the exterior surface.

4. A tool holder according to any of claims 2 and 3, wherein the cross-section of the outer surface is a major arc.

5. The tool holder of claim 1, wherein the first corner portion and the second corner portion are right-angled, rounded, acute, or obtuse; or the cross sections of the first corner part and the second corner part are both curved lines or straight lines.

6. The toolholder according to claim 1, wherein the height of the first side and the height of the second side are greater than the radius of the mandrel.

7. The toolholder according to claim 6, wherein the height of the first side surface and the height of the second side surface are each from 2.28 millimeters to 3.8 millimeters.

8. The toolholder according to claim 7, wherein the first side surface has a height that is equal to or unequal to a height of the second side surface.

9. The tool holder of claim 1, wherein the slide retaining groove is formed by milling with a milling cutter.

10. A cutting stapler comprising a tool holder and a mandrel received in a receiving space of the tool holder, wherein the tool holder is according to any one of claims 1 to 9.