Surgical instrument
By designing large recesses and ultrasonic reflectors in surgical instruments, the problem of insufficient ultrasonic visibility in minimally invasive surgery has been solved, achieving greater safety and precision.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PAJUNK GMBH MEDIZINTECH
- Filing Date
- 2024-08-29
- Publication Date
- 2026-05-19
AI Technical Summary
Existing surgical instruments have insufficient ultrasound visibility in minimally invasive surgery, affecting surgical safety.
Design a surgical instrument in which the blade carrier has a recess that is 75% wider than the blade carrier width, the recess having a specific sidewall and bottom surface structure, and combined with an ultrasonic reflector to enhance ultrasonic visibility.
It significantly improves ultrasound visibility in minimally invasive surgery, enhancing the safety and precision of the procedure.
Smart Images
Figure CN122070100A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a surgical instrument. Background Technology
[0002] The median nerve of the hand, which controls the muscles of the thumb and palm, extends through a tunnel-like canal known as the carpal tunnel. At wrist level, a wide band stretches between the muscles of the thumb and little finger. This band, also called the flexor retinaculum, forms the apex of the carpal tunnel, which contains the median nerve and the flexor tendons of the fingers. In carpal tunnel syndrome, this tunnel becomes too narrow, creating pressure on the median nerve. This can cause pain, in the form of tingling or numbness in the hand.
[0003] In some cases, surgery is required to treat carpal tunnel syndrome. During the procedure, the nerve pathway is widened by severing the flexor retinaculum that crosses the carpal bones and defines the carpal tunnel towards the palm. This surgery can be performed not only openly but also minimally invasively. In one possible minimally invasive method of splitting the carpal bone top, a small incision of about two centimeters is made in the wrist region on the flexor side. Through this incision, a small probe with a scalpel is inserted into the carpal tunnel between the median nerve and the carpal bone top. While the probe is inside the carpal tunnel, the carpal bone top can be split from the inside.
[0004] For minimally invasive surgery, a surgical instrument is known to have a handle and a blade disposed on the handle, the blade having a concave cutting edge, wherein the blade has a flat surface. DE102019120671A1 discloses such a surgical instrument, which includes an ultrasonic visibility enhancement device in the form of a number of recesses, each of which has exactly three side surfaces oriented perpendicularly to each other. Even though such recesses allow for a certain degree of ultrasonic visibility, it has been shown that the ultrasonic visibility in this instrument needs improvement. Summary of the Invention
[0005] Therefore, the object of the present invention is to provide a surgical instrument that can further enhance the safety of minimally invasive surgery at the wrist tube.
[0006] The object of the present invention is achieved by a surgical instrument having the features of claim 1.
[0007] Advantageous designs and improvements of the invention are given in the dependent claims.
[0008] The surgical instrument according to the invention has a handle and a blade carrier disposed on the handle, the blade carrier having a blade disposed in a plane, wherein the blade has a cutting edge configured as concave, and wherein the blade carrier has a width in a direction transverse to the longitudinal axis of the blade carrier. The blade carrier is characterized by having an upper side and a lower side, wherein the plane extends transversely to, and particularly perpendicularly to, the upper and lower sides, and wherein the upper side has at least one recess having a sidewall, a bottom surface, a length in the direction of the longitudinal axis of the blade carrier, and a width in a direction transverse to the plane of the blade, wherein the width of the recess is greater than 75%, preferably greater than 80%, particularly preferably greater than 85% of the width of the blade carrier. It has been surprisingly demonstrated that such a large recess can be particularly clearly identified in ultrasound and can therefore significantly enhance ultrasound visibility.
[0009] Here, the width of the recess is particularly smaller than the width of the blade carrier.
[0010] Advantageously, the bottom surface is oriented perpendicular to the plane of the blade. This arrangement allows for good blade positioning because the relative orientation between the bottom surface and the blade is determined.
[0011] According to a particularly preferred embodiment, the bottom surface is arranged parallel to the top. Since ultrasound waves are typically directed vertically onto the top of the blade carrier in specific surgeries used to treat carpal tunnel syndrome, this arrangement further enhances ultrasound visibility.
[0012] Particularly preferably, the sidewalls are arranged perpendicular to the upper side, especially along all four lateral directions. This arrangement further improves ultrasonic visibility, as ultrasound waves are typically directed vertically to the upper side of the blade carrier during specific procedures used to treat carpal tunnel syndrome.
[0013] Advantageously, the length of the recess is greater than its width. This design allows for good visibility of the recess in ultrasound images.
[0014] An advantageous improvement of the invention specifies that at least one recess has a rectangular cross-section parallel to the upper side, the rectangular cross-section having a front edge, a rear edge, and two side edges. This recess allows for particularly good visibility in ultrasound images.
[0015] According to a particularly preferred embodiment of the invention, at least one of the recesses is arranged such that its leading edge and the bottom of the cutting edge, especially the concave cutting edge, are arranged in the same cutting plane perpendicular to the longitudinal axis of the insert carrier. In other words, the bottom or lowest point of the cutting edge is located below the leading edge of the recess in a top view. This design allows for particularly good positioning of the insert because the relative orientation between the recess and the insert is determined.
[0016] When, according to an advantageous improvement, multiple recesses, preferably three recesses, are arranged sequentially along the longitudinal axis of the blade holder on the upper side of the blade holder, ultrasonic visibility can be further improved, because this structure can also produce a clearly identifiable structure in the ultrasonic image.
[0017] Preferably, the front edges of the recesses are arranged equidistantly from each other. In this way, the recesses can form a scale that can provide the user with information about the penetration depth of the instrument or the distance from the hand to the parts surrounding the instrument.
[0018] The deeper the recess, the better the ultrasonic visibility generally is. Advantageously, the sidewalls can therefore have the highest possible height, for example, up to 50% of the height of the blade holder.
[0019] To further improve the visibility of the ultrasonic waves, ultrasonic reflectors are preferably arranged in the bottom surface. These ultrasonic reflectors are particularly configured as recesses, wherein each recess preferably has two, preferably exactly three, sidewalls that are each perpendicular to each other.
[0020] Advantageously, the blades are made of metal, especially stainless steel. Metal blades can be made to achieve the desired sharpness particularly well.
[0021] Preferably, the blade holder and / or handle are made of plastic, particularly by injection molding or 3D printing. This allows for a simple and low-cost manufacturing method. Furthermore, this allows the surgical instruments to be manufactured with a lower weight than, for example, those made of metal.
[0022] According to an advantageous design of the invention, the blade is arranged in a non-removable manner in a blade holder, particularly by direct injection molding or 3D printing. This allows for reliable fixation of the blade within the surgical instrument.
[0023] A preferred embodiment of the invention specifies that the blade holder is detachably connected to the handle. This allows for the blade holder to be configured as a disposable component, while the handle can be reused multiple times.
[0024] Advantageously, the handle has perforations, through which the weight of the handle can be reduced. Attached Figure Description
[0025] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings:
[0026] Figure 1 A perspective view of an embodiment of a surgical instrument according to the present invention is shown;
[0027] Figure 2 It shows that according to Figure 1 Enlarged cross-sectional view of the distal end of a surgical instrument;
[0028] Figure 3 It shows that according to Figure 1 A top view of the surgical instruments;
[0029] Figure 4 It shows along Figure 3 A cross-sectional view of line AA in the diagram;
[0030] Figure 5 It shows Figure 4 Enlarged cross-sectional view; and
[0031] Figure 6 It shows Figure 2 Enlarged cross-sectional view. Detailed Implementation
[0032] Figures 1 to 6 Various views of embodiments of the surgical instrument 10 according to the present invention are shown.
[0033] The instrument 10 has a handle 20 and a blade carrier 50 with a blade 30 disposed on the handle 20. The blade 30 has a cutting edge 32 configured as concave. The blade 30 can be, especially in Figure 5 As can be seen, it is configured as a sheet and here has a plane EK that extends parallel to the surface. The plane EK of the blade 30 is in Figure 5 The middle is the paper plane and in Figure 3 The blade 30 is perpendicular to the plane of the paper. The thickness of the blade 30 should be sufficient to ensure adequate stability. Specifically, the blade 30 is made of metal, such as stainless steel. The cutting edge 32 can be configured as, for example, U-shaped or V-shaped. The cutting edge 32 is located within the plane EK of the blade 30. The cutting edge 32 is configured as a concave recess, for example, starting from one of the side edges of the blade 30.
[0034] The blade 30 is secured in the blade carrier 50, which is disposed on the handle 20. Here, the blade carrier 50 can be integrally connected to the handle 20 or preferably detachably disposed on the handle 20 via a detachable connector, such as a screw connector or a bayonet connector. This allows for easy replacement of the blade 30 by making it replaceable, including the blade carrier 50.
[0035] The instrument 10 may have a first section 14 and a second section 15, the first section 14 being formed, for example, mostly by a handle 20, having a first longitudinal axis l1, and the second section 15 being formed, for example, mostly by a blade carrier 50, having a second longitudinal axis l2. The longitudinal axes l1 and l2 may be flush. However, advantageously, the second longitudinal axis l2 is inclined at an angle α relative to the first longitudinal axis l1, wherein the angle α is in the range of 10° to 40°, preferably in the range of 20° to 30°, and for example, 25°. Here, the angle α formed by the inclination of the second longitudinal axis l2 relative to the first longitudinal axis l1 lies particularly within the plane EK of the blade 30 (see...). Figure 4 ).
[0036] The instrument 10 may be configured as a pin with a distal end 11 and a proximal end 12, wherein the blade 30 is arranged at the distal end 11, particularly at the end face of the distal end 11. Here, the blade 30 is specifically oriented such that the longitudinal axis l2 of the first section 14, particularly the handle 20, lies in the plane of the blade 30.
[0037] The blade carrier 50 has a longitudinal axis lK, a width bK, and an upper side 51 and a lower side 52. The longitudinal axis lK may coincide, in particular, with a second longitudinal axis l2. The plane EK of the blade 30 extends transversely to, and in particular perpendicularly to, the upper side 51 and the lower side 52. The upper side 51 has at least one recess 40, which has a sidewall 41, a bottom surface 42, a length lA along the longitudinal axis lK of the blade carrier 50, and a width bA along the direction transverse to the plane EK of the blade 30. The width bA of the recess 40 is greater than 75% of the width bK of the blade carrier, preferably greater than 80%, and particularly preferably greater than 85%. The recess 40 extends almost across the entire width bK of the blade carrier 50 to such an extent that the sidewall 41 of the recess 40 can still be stably formed in the blade carrier 50. However, the width bA of the recess 40 is less than the width bK of the blade carrier 50. The length lA of the recess 40 is preferably greater than the width bA of the recess 40. The bottom surface 42 can be oriented perpendicular to the plane EK of the blade 30. In particular, the bottom surface 42 can be arranged parallel to the upper side 51. The sidewall 41 can be arranged perpendicular to the upper side 51.
[0038] At least one recess 40 is configured such that it has a rectangular cross-section parallel to the upper side 51, the rectangular cross-section having a front edge 46, a rear edge 47, and two side edges 48a, 48b that are particularly parallel to each other. In particular, the recess 40 may be configured as a substantially cuboid shape.
[0039] The embodiment of the surgical instrument 10 shown in the figure has three recesses 40, which are arranged successively in the upper side 51 of the blade holder 50 along the longitudinal axis lK of the blade holder 50. The recess 40a closest to the distal end 11 of the instrument 10 is arranged in such a way that the leading edge 46 is positioned above the blade 30, especially above the nearest point of the cutting edge 32, or in other words, in a cutting plane S perpendicular to the longitudinal axis lK of the blade holder 50, which is the same as the bottom of the cutting edge 32, especially the concave cutting edge 32, or the nearest point of the cutting edge 32 (see especially). Figure 5 ).
[0040] The three recesses 40 are arranged such that the front edges 46 of the recesses 40 are equidistant from each other by a distance a (see especially) Figure 3 This allows us to establish a scale. The distance 'a' could be, for example, 1 cm.
[0041] The sidewall 41 of the recess may have a height hA, which can be up to 50% of the height hK of the blade holder 50. Here, the recess 40a, which is arranged closest to the distal end 11 of the instrument 10 and especially above the blade 30, may have a smaller depth than the following recess 40, since the recess is located above the blade 30.
[0042] Ultrasonic reflectors can be arranged in the bottom surface 42, and these ultrasonic reflectors can be configured as recesses 44. The recesses 44 are configured in such a way that they reflect ultrasonic waves, particularly regardless of the direction from which the ultrasonic waves impact the recesses 44. For this purpose, the recesses 44 can have, for example, exactly three side surfaces 44a, 44b, 44c, each oriented perpendicularly to the others (see especially...). Figure 2 Thus, a recess 44 is created, as if a corner of a cube had been pressed into the surface. This recess 44 reflects the incident ultrasonic beam back parallel to the incident direction, independent of the incident direction.
[0043] The first side surface 44a of the recess 44 may form an angle of approximately 35° with the bottom surface 42. The second side surface 44b and the third side surface 44c may be arranged symmetrically with respect to the longitudinal axis 1K of the blade carrier. For example, the recess 44 may have a triangular base surface 44d in the bottom surface 42, wherein the vertex of the triangle points towards the distal end 11 of the surgical instrument (see...). Figure 2 and Figure 6 ).
[0044] The blade carrier 50 and / or handle 20 can be made of plastic, for example, by injection molding or 3D printing. Specifically, the blade carrier 50 and handle 20 can be configured as two parts or as a single piece connected to each other. Here, in particular, the blade 30 can be arranged non-removably in the blade carrier 50, for example, by directly overmolding the blade 30 using injection molding or 3D printing. The handle 20 can have perforations 22, which can reduce the weight of the handle 20.
[0045] List of reference numerals
[0046] 10 instruments
[0047] 11 distal end
[0048] 12 Proximal end
[0049] 14 First Section
[0050] 15 Second Part
[0051] 20 handles
[0052] 22 perforations
[0053] 30 blades
[0054] 32 cutting edge
[0055] 40 recess
[0056] 41 sidewalls
[0057] 42 bottom surface
[0058] 44 Recessed area
[0059] 44a First side surface
[0060] 44b Second side surface
[0061] 44c third side surface
[0062] 44d substrate surface
[0063] 45 cross-section
[0064] 46 leading edge
[0065] 47 rear edge
[0066] 48a side edge
[0067] 48b side edge
[0068] 50 blade carrier
[0069] 51 upper side
[0070] 52 lower side
[0071] The flat surface of the EK blade
[0072] Longitudinal axis of lK blade carrier
[0073] l1 First longitudinal axis
[0074] l2 Second longitudinal axis
[0075] α angle
[0076] Length of the recess lA
[0077] Width of the recessed part bA
[0078] height of hA recess
[0079] width of bK blade carrier
[0080] hK blade carrier height
[0081] S-section plane
[0082] a distance
Claims
1. A surgical instrument (10) having a handle (20) and a blade carrier (50) disposed on the handle (20), the blade carrier (50) having a blade (30) disposed in a plane (EK), wherein, The blade (30) has a concave cutting edge (32), wherein the blade support (50) has a width (bK) in a direction transverse to the longitudinal axis (lK) of the blade support (50), characterized in that the blade support (50) has an upper side (51) and a lower side (52), wherein the plane (EK) extends transversely to the upper side (51) and the lower side (51), and wherein the upper side (51) has at least one recess (40), the recess (40) having a sidewall (41), a bottom surface (52), a length (lA) in the direction of the longitudinal axis (lK) of the blade support (50), and a width (bA) in a direction transverse to the plane (EK) of the blade (30), wherein the width (bA) of the recess (40) is greater than 75% of the width (bK) of the blade support (50).
2. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The width (bA) of the recess (40) is smaller than the width (bK) of the blade carrier (50).
3. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The bottom surface (42) is oriented perpendicular to the plane (EK) of the blade (30).
4. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The bottom surface (42) is arranged parallel to the upper side (51).
5. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The sidewall (41) is arranged perpendicular to the upper side (51).
6. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The length (lA) of the recess (40) is greater than the width (bA) of the recess (40).
7. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The at least one recess (40) has a rectangular cross-section (45) parallel to the upper side (51), the rectangular cross-section (45) having a front edge (46), a rear edge (47) and two side edges (48a, 48b).
8. The surgical instrument (10) according to any one of the preceding claims, characterized in that, One of the at least one recess (40) is arranged such that the front edge (46) and the bottom of the cutting edge (32), especially the concave cutting edge (32), are arranged in the same cutting plane (S) perpendicular to the longitudinal axis (lK) of the blade carrier (50).
9. The surgical instrument (10) according to any one of the preceding claims, characterized in that, Multiple recesses (40), preferably three recesses (40), are arranged successively in the upper side (51) of the blade holder (50) along the direction of the longitudinal axis (lK) of the blade holder (50).
10. The surgical instrument (10) according to claim 9, characterized in that, The front edges (46) of the recess (40) are arranged equidistantly from each other.
11. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The sidewall (41) has a height (hA) that is up to 50% of the height (hK) of the blade holder (50).
12. The surgical instrument (10) according to any one of the preceding claims, characterized in that, A plurality of ultrasonic reflectors are arranged in the bottom surface (42), the ultrasonic reflectors being particularly configured as recesses (44), wherein each recess (44) preferably has two, preferably exactly three, sidewalls (44a, 44b, 44c) that are perpendicular to each other.
13. The surgical instrument according to any one of the preceding claims, characterized in that, The blade (30) is made of metal, especially stainless steel.
14. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The blade holder (50) and / or the handle (20) are made of plastic, particularly encapsulated by injection molding or 3D printing.
15. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The blade (30) is arranged in the blade holder (50) in a non-removable manner, particularly by injection molding or by 3D printing.
16. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The blade holder (50) is detachably connected to the handle (20).
17. The surgical instrument (10) according to any one of the preceding claims, characterized in that, The handle (20) has a perforation (22).