Craniotomy saw

Abstract

The invention provides a craniotomy saw, and relates to the technical field of craniotomy tools, in order to solve the problem that in the prior art, in a craniotomy operation, a complete bone flap of a drilled hole cannot be reserved, the craniotomy saw comprises a driving part, an eccentric shaft, a swing part, a main shaft and a first saw barrel, one end of the main shaft is connected with the swing part, the other end of the main shaft is in transmission connection with the first saw barrel, and the power output end of the driving part is in transmission connection with the eccentric shaft. The eccentric shaft is in transmission connection with the swing part and can drive the swing part to swing, and the swing part can drive the first saw barrel to rotate synchronously through the main shaft. By means of the craniotomy saw, the cut skull can be completely reserved and can be completely put back subsequently, the skull is recovered as early as possible, and cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of craniotomy tools, and in particular to a craniotomy saw. Background Art

[0002] In current clinical craniotomy and skull drilling operations, the existing skull drilling tools all use old-fashioned solid drill bits. The drill bit structure has a large-area cutting edge, which requires a large amount of power and pressure during drilling. During the drilling process of the drill bit, it generates a large vibration on the brain. Especially when the drilled bone tissue is broken into debris and removed, it is impossible to retain and replace the intact bone flap of the drilled hole. The holes left on the skull need to be filled with other materials later, increasing the cost. Moreover, the large-power jitter drilling of the drill, the depth is not easy to control, it is easy to damage the brain, and the slow feeding requirement during operation leads to very high professional requirements for brain drilling, and it is traumatic, time-consuming and expensive. Summary of the Invention

[0003] The purpose of the present invention is to provide a craniotomy saw to solve the problem that the intact bone flap of the drilled hole cannot be retained in the existing craniotomy technology. The craniotomy saw of the present invention can retain the cut skull intact, and can be put back completely later, restoring it to its original state, and saving costs.

[0004] A craniotomy saw provided by the present invention includes a driving member, an eccentric shaft, a swinging member, a main shaft and a first saw cylinder. One end of the main shaft is connected to the swinging member and the other end is in transmission connection with the first saw cylinder. The power output end of the driving member is in transmission connection with the eccentric shaft. The eccentric shaft is in transmission connection with the swinging member and can drive the swinging member to swing, and the swing can drive the first saw cylinder to rotate synchronously through the main shaft.

[0005] As a preferred solution of the present invention, the swinging member includes a swinging part and a rotating part. The swinging part is connected to one side of the rotating part. The rotating part is connected to the main shaft. The swinging part includes two swinging arms. A swinging cavity is formed between the two swinging arms. The eccentric shaft is arranged in the swinging cavity. A collision block is connected to the outside of the eccentric shaft. When the eccentric shaft rotates, it drives the collision block to alternately collide with the two swinging arms and drives the two swinging arms to swing reciprocally.

[0006] As a preferred solution of the present invention, it further includes a shaft seat. The shaft seat is connected to the outside of the main shaft and is arranged towards the side close to the first saw cylinder. A plurality of limiting grooves are arranged on the end face of the shaft seat. The plurality of limiting grooves are arranged around its central axis. A plurality of limiting teeth adapted to the limiting grooves are arranged on the end of the first saw cylinder close to the main shaft. The limiting teeth are inserted into the limiting grooves.

[0007] As a preferred embodiment of the present invention, it further includes a second saw cylinder, the second saw cylinder is sleeved outside the first saw cylinder and is coaxially connected, and the serrated end of the first saw cylinder extends out of the serrated end of the second saw cylinder.

[0008] As a preferred embodiment of the present invention, a plurality of limiting ports are provided at one end of the first saw cylinder close to the limiting teeth, and a plurality of limiting blocks adapted to the limiting ports are provided at one end of the second saw cylinder close to the shaft seat. The limiting blocks are arranged inside the second saw cylinder and are inserted into the limiting ports.

[0009] As a preferred embodiment of the present invention, it further includes an inner shaft, the inner shaft is coaxially arranged inside the main shaft, the head end of the inner shaft extends out of the main shaft and extends into the first saw cylinder, and the head end of the inner shaft is connected to the first saw cylinder.

[0010] As a preferred embodiment of the present invention, a cap is provided at the tail end of the main shaft, a limiting hole is provided at the tail end of the inner shaft, and an elastic member is provided in the limiting hole. One end of the elastic member abuts against the cap and the other end abuts against the inner shaft.

[0011] As a preferred embodiment of the present invention, a chute is provided at the tail end of the main shaft facing the inner shaft, and a sliding block is connected to the tail end of the inner shaft. The sliding block is slidably arranged in the chute.

[0012] As a preferred embodiment of the present invention, it further includes a first outer shell and a second outer shell. The first outer shell is installed outside the shaft seat, the eccentric shaft and the swinging member. The input end of the eccentric shaft is connected to a transmission shaft, and the second outer shell is installed outside the tail end of the main shaft and the transmission shaft.

[0013] As a preferred embodiment of the present invention, it further includes a handle. On the handle, a switch button and a battery box are provided. The driving member is arranged inside the handle, and the switch button and the battery box are connected to the driving member.

[0014] Compared with the prior art, the present invention has the following positive effects:

[0015] The craniotomy saw provided by the present invention includes a driving member, an eccentric shaft, a swinging member, a main shaft and a first saw cylinder. One end of the main shaft is connected to the swinging member, and the other end is in transmission connection with the first saw cylinder. The power output end of the driving member is in transmission connection with the eccentric shaft. The eccentric shaft is in transmission connection with the swinging member and can drive the swinging member to swing, and the swinging can drive the first saw cylinder to rotate synchronously through the main shaft. In the craniotomy saw of the present invention, the driving member drives the eccentric shaft to rotate, and then drives the swinging member to swing around the axis of the main shaft, so that the main shaft rotates reciprocally within a certain angle range, and the first saw cylinder cuts reciprocally. The first saw cylinder only cuts the periphery of the hole. During clinical craniocerebral neurosurgery or multi-hole drilling, the annular saw blade of the first saw cylinder cuts reciprocally, with very low power consumption and applied pressure, high cutting accuracy, easy to control, able to preserve the integrity of the bone, and can be filled back to its original position after the operation, returning to its original state, saving more time and money. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Structural schematic diagram of the mechanical part of the craniotomy saw of the present invention;

[0018] Figure 2 Internal structural schematic diagram of the mechanical part of the craniotomy saw of the present invention;

[0019] Figure 3 Exploded view of the mechanical part of the craniotomy saw of the present invention;

[0020] Figure 4 Structural schematic diagram of the connection between the swinging member and the eccentric shaft in the present invention;

[0021] Figure 5 Plan view of the connection between the swinging member and the eccentric shaft in the present invention;

[0022] Figure 6 Structural schematic diagram of the connection between the first saw cylinder and the second saw cylinder in the present invention;

[0023] Figure 7 Schematic diagram of the connection between the eccentric shaft, the swinging member and the transmission shaft in the present invention;

[0024] Figure 8 External structural schematic diagram of the craniotomy saw of the present invention;

[0025] Figure 9Schematic diagram of the internal structure of the craniotomy saw of the present invention.

[0026] In the figure: 11, the first outer shell; 12, the second outer shell; 2, the transmission shaft; 3, the eccentric shaft; 31, the collision block; 4, the swing member; 41, the rotating part; 411, the connecting hole; 42, the swing part; 421, the swing arm; 422, the swing cavity; 423, the lower opening; 5, the main shaft; 51, the sliding groove; 6, the first saw cylinder; 61, the limiting teeth; 62, the limiting opening; 7, the inner shaft; 71, the limiting hole; 8, the shaft seat; 81, the limiting groove; 9, the second saw cylinder; 91, the limiting block; 101, the connecting block; 102, the cap; 103, the sliding block; 104, the elastic member; 105, the handle; 106, the switch button; 107, the battery box. Detailed implementation manners

[0027] In the description of the present invention, it should be noted that unless otherwise stated, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The following further describes in detail the specific implementation manners of the present invention with reference to the drawings.

[0030] Embodiment 1:

[0031] A craniotomy saw provided in this embodiment is as Figures 1-7As shown, it includes a driving member, an eccentric shaft 3, a swinging member 4, a main shaft 5, and a first saw cylinder 6. Among them, the driving member can be a servo motor. The first saw cylinder 6 is a cylindrical structure with a hollow interior, and the head end of the first saw cylinder 6 is serrated. One end of the main shaft 5 is connected to the swinging member 4 and the other end is drivingly connected to the first saw cylinder 6. The power output end of the driving member is drivingly connected to the eccentric shaft 3. The eccentric shaft 3 is drivingly connected to the swinging member 4 and can drive the swinging member 4 to swing, and the swing can drive the first saw cylinder 6 to rotate synchronously through the main shaft 5.

[0032] In the craniotomy saw of this embodiment, the driving member drives the eccentric shaft 3 to rotate, and then drives the swinging member 4 to swing around the axis of the main shaft 5, so that the main shaft reciprocates within a certain angle range, and the first saw cylinder 6 reciprocates to cut. The first saw cylinder 6 only cuts the periphery of the hole. When performing a clinical craniocerebral neurosurgery craniotomy or multi-hole drilling, the annular saw blade of the first saw cylinder 6 reciprocates to cut, with very low power consumption and the pressure applied, high cutting accuracy, easy to control, able to preserve the integrity of the bone, and can be filled back in place after the operation, returning to its original state, saving more time and money.

[0033] As a preferred embodiment, the swinging member 4 includes a swinging portion 42 and a rotating portion 41, and the swinging portion 42 is connected to one side of the rotating portion 41. As Figure 2 shown, the swinging portion 42 is connected to the lower side of the rotating portion 41. The rotating portion 41 is connected to the main shaft 5. There is a connection hole 411 in the rotating portion 41 that is adapted to the main shaft 5, and both sides of the connection hole 411 are planar. Further, the rotating portion 41 is connected to the main shaft 5 by a pin, so that the swing of the swinging member 4 can drive the main shaft 5 to reciprocate within a certain angle range.

[0034] As Figures 3-5 shown, the swinging portion 42 includes two swinging arms 421, and a swinging cavity 422 is formed between the two swinging arms 421. The eccentric shaft 3 is disposed in the swinging cavity 422, and a collision block 31 is connected to the outside of the eccentric shaft 3. When the eccentric shaft 3 rotates, it drives the collision block 31 to alternately collide with the two swinging arms 421 and drives the two swinging arms 421 to swing reciprocally. Specifically, as Figure 5 shown, the collision block 31 is in a semi-circular shape and is disposed on one side of the center line of the eccentric shaft, so that the rotation of the eccentric shaft 3 can drive the collision block 31 to alternately collide with the opposite sides of the two swinging arms 421, thereby driving the swinging member 4 to swing left and right. The upper sides of the two swinging arms 421 are connected to the rotating portion 41, and a lower opening 423 is formed between the lower sides of the two swinging arms 421 to reduce the frictional effect between the swinging portion 42 and the collision block 31.

[0035] As a preferred embodiment, as Figure 3As shown in the figure, the craniotomy saw of this embodiment further includes a shaft seat 8. The shaft seat 8 is connected to the outside of the main shaft 5 and is arranged on the side close to the first saw cylinder 6. The shaft seat 8 has a sleeve portion, and the sleeve portion is sleeved on the outside of the main shaft 5 and connected by a pin, so that the reciprocating rotation of the main shaft 5 can drive the shaft seat 8 to rotate synchronously in a reciprocating manner. A plurality of limiting grooves 81 are arranged on the end face of the shaft seat 8, and the plurality of limiting grooves 81 are arranged around its central axis. A plurality of limiting teeth 61 adapted to the limiting grooves 81 are arranged on one end of the first saw cylinder 6 close to the main shaft 5, and the limiting teeth 61 are inserted into the limiting grooves 81. Specifically, both the limiting grooves 81 and the limiting teeth 61 are provided with three.

[0036] When the limiting teeth 61 are inserted into the limiting grooves 81, the reciprocating rotation of the main shaft 5 can drive the shaft seat 8 to rotate reciprocally, and then drive the first saw cylinder 6 to rotate reciprocally. When the limiting teeth 61 are pulled out of the limiting grooves 81 to the side away from the shaft seat 8, the rotation of the shaft seat 8 cannot drive the first saw cylinder 6 to rotate, and the main shaft 5 can only drive the shaft seat 8 to rotate idly.

[0037] As a preferred embodiment, as Figure 2 and Figure 3 shown, the craniotomy saw of this embodiment further includes a second saw cylinder 9. The second saw cylinder 9 is sleeved on the outside of the first saw cylinder 6 and is coaxially connected. The serrated end of the first saw cylinder 6 extends out of the serrated end of the second saw cylinder 9. The second saw cylinder 9 can be limited on the skull around the punched hole when the first saw cylinder 6 penetrates the skull, and further limit the distance that the first saw cylinder 6 extends into the skull to ensure safety.

[0038] As a preferred embodiment, a plurality of limiting ports 62 are arranged on one end of the first saw cylinder 6 close to the limiting teeth 61. Specifically, a limiting port 62 is formed between two adjacent limiting teeth 61. A plurality of limiting blocks 91 adapted to the limiting ports 62 are arranged on one end of the second saw cylinder 9 close to the shaft seat 8. The limiting blocks 91 are arranged inside the second saw cylinder 9 and are inserted into the limiting ports 62. The arc length of the limiting port 62 is equal to the arc length of the limiting block 91, so that the reciprocating rotation of the first saw cylinder 6 can drive the second saw cylinder 9 to rotate synchronously in a reciprocating manner.

[0039] As a preferred embodiment, as Figure 2 and Figure 3 shown, the craniotomy saw of this embodiment further includes an inner shaft 7. The inner shaft 7 is coaxially arranged inside the main shaft 5. The head end of the inner shaft 7 extends out of the main shaft 5 and extends into the first saw cylinder 6. The head end of the inner shaft 7 is connected to the first saw cylinder 6. A connecting block 101 is sleeved on the head end of the inner shaft 7 and is connected to the pin hole on the first saw cylinder 6 through a pin passing through the connecting block 101.

[0040] As Figure 2As shown, when the inner shaft 7 moves axially to the left relative to the main shaft 5, it can drive the first saw cylinder 6 to move to the left, thereby changing the insertion state of the limiting teeth 61 and the limiting grooves 81.

[0041] As a preferred embodiment, as Figure 2 and Figure 3 shown, a cap 102 is provided at the tail end of the main shaft 5, a limiting hole 71 is provided at the tail end of the inner shaft 7, and an elastic member 104 is provided in the limiting hole 71. One end of the elastic member 104 abuts against the cap 102 and the other end abuts against the inner shaft 7. Specifically, the elastic member 104 is a spring.

[0042] The elastic member can push the first saw cylinder 6 forward when the head end of the first saw cylinder 6 loses the axial pressure, so that the limiting teeth 61 are disengaged from the limiting grooves 81, the rotation of the main shaft 5 cannot drive the first saw cylinder 6 and the second saw cylinder 9 to rotate, and the main shaft 5 is in an idling state.

[0043] As a preferred embodiment, a sliding groove 51 facing the inner shaft 7 is provided at the tail end of the main shaft 5, and a sliding block 103 is connected to the tail end of the inner shaft 7. The sliding block 103 is slidably disposed in the sliding groove 51.

[0044] In this embodiment, by limiting the distance that the sliding block 103 can slide in the sliding groove 51, the distance that the elastic member can push the first saw cylinder 6 forward is further limited to ensure safety. As Figure 2 shown, when the sliding block 103 slides to the leftmost side of the sliding groove 51, the first saw cylinder 6 moves forward to the limit position.

[0045] When the craniotomy saw of this embodiment is in use, the first saw cylinder 6 corresponds to the opening position of the skull, and the skull exerts an axial pressure on the first saw cylinder 6. At this time, the elastic member 104 is in a compressed state, and the limiting teeth 61 of the first saw cylinder 6 are inserted into the limiting grooves 81. The reciprocating rotation of the main shaft 5 can drive the first saw cylinder 6 and the second saw cylinder 9 to rotate synchronously to reciprocally cut the skull. At the moment when the skull is penetrated, the head end of the first saw cylinder 6 loses the axial pressure from the skull, the elastic member pushes the first saw cylinder 6 forward, and the limiting teeth 61 of the first saw cylinder 6 are disengaged from the limiting grooves 81, so that the rotation of the main shaft 5 cannot drive the first saw cylinder 6 and the second saw cylinder 9 to rotate. The second saw cylinder 9 is limited to the skull around the hole, and the distance that the first saw cylinder 6 extends into the skull is further limited by the sliding block 103 and the sliding groove 51, protecting the tissues inside the skull from injury and ensuring the safety of the operation.

[0046] The craniotomy saw of this embodiment uses power to drive a double-layer saw cylinder. Under the action of the elastic member, the inner shaft stops the operation of the first saw cylinder 6 and the second saw cylinder 9, realizes automatic stop of drilling and protection, realizes retention of the drilled bone and safe craniotomy.

[0047] As a preferred embodiment, as Figures 1-3 shown, the craniotomy saw of this embodiment further includes a first housing 11 and a second housing 12. The first housing 11 is installed outside the shaft seat 8, the eccentric shaft 3 and the swing member 4. A transmission shaft 2 is connected to the input end of the eccentric shaft 3. The second housing 12 is installed outside the tail end of the main shaft 5 and the transmission shaft 2. The other end of the second housing 12 is connected to the outside of the first housing 11.

[0048] In this embodiment, when the second housing 12 is disassembled, the connection state between the transmission shaft 2 and the driving member can be inspected, and the usage condition of the elastic member can also be inspected. When the first housing 11 is further disassembled, the connection states of the shaft seat 8, the eccentric shaft 3 and the swing member 4 can be inspected. Therefore, by providing the first housing 11 and the second housing 12, not only the internal components are firmly connected, but also the step-by-step maintenance is convenient.

[0049] As a preferred embodiment, as Figure 8 and Figure 9 shown, the craniotomy saw of this embodiment further includes a handle 105. On the handle 105, a switch button 106 and a battery box 107 are provided. The driving member is arranged inside the handle 105. The switch button 106 and the battery box 107 are connected to the driving member. The battery in the battery box 107 can be a rechargeable battery. The battery provides power for the driving member, and the switch button 106 controls the start and stop of the driving member. The handle 105 is convenient for holding. The handle 105 is detachably connected to the end of the second housing away from the first housing, and the connection method can be snap connection or screw connection.

[0050] The craniotomy saw in this embodiment includes a mechanical part and an electrical part. The above-mentioned first housing 11 and second housing 12 and their internal components are the mechanical part, and the handle 105 and its internal components are the electrical part. The mechanical part and the electrical part are detachably arranged, so that the mechanical part can be disassembled for separate high-temperature and high-pressure disinfection treatment, and the electrical part does not need to be disinfected, reducing the failure rate.

[0051] The craniotomy saw in this embodiment realizes the standardization and repeatability of the skull drilling operation, and the operation is simple, easy to implement, safe and reliable, time-saving and efficient, and has small surgical trauma, providing a surgical technical guarantee for clinical craniotomy and skull drilling.

[0052] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can make several deformations and improvements without departing from the creative concept of the present invention, and all should be covered by the protection scope of the present invention.

Claims

1. A craniotomy saw, characterized in that: It comprises a driving member, an eccentric shaft (3), a swinging member (4), a main shaft (5) and a first saw cylinder (6), one end of the main shaft (5) is connected to the swinging member (4) and the other end is transmission-connected to the first saw cylinder (6), the power output end of the driving member is transmission-connected to the eccentric shaft (3), the eccentric shaft (3) is transmission-connected to the swinging member (4) and can drive the swinging member (4) to swing, and the swinging can drive the first saw cylinder (6) to rotate synchronously through the main shaft (5).

2. A craniotomy saw according to claim 1, characterized in that: The swing member (4) comprises a swing part (42) and a rotating part (41), wherein the swing part (42) is connected to one side of the rotating part (41), and the rotating part (41) is connected to the main shaft (5). The swing part (42) comprises two swing arms (421), and a swing cavity (422) is formed in the two swing arms (421). The eccentric shaft (3) is arranged in the swing cavity (422), and a collision block (31) is connected to the outer side of the eccentric shaft (3). When the eccentric shaft (3) rotates, the collision block (31) is driven to alternately collide with the two swing arms (421) and drive the two swing arms (421) to swing back and forth.

3. A craniotomy saw according to claim 1, characterized in that: It also includes an axle seat (8), which is connected to the outer side of the main shaft (5) and is arranged on the side close to the first saw cylinder (6), and a plurality of limit grooves (81) are arranged on the end face of the axle seat (8), and the plurality of limit grooves (81) are arranged around its central axis, and a plurality of limit teeth (61) adapted to the limit grooves (81) are arranged on one end of the first saw cylinder (6) close to the main shaft (5), and the limit teeth (61) are inserted into the limit grooves (81).

4. A craniotomy saw according to claim 3, characterized in that: It also comprises a second saw cylinder (9), which is sleeved on the outer side of the first saw cylinder (6) and coaxially connected, and the saw tooth end of the first saw cylinder (6) protrudes from the saw tooth end of the second saw cylinder (9).

5. A craniotomy saw according to claim 4, characterized in that: A plurality of limiting openings (62) are arranged at one end of the first saw cylinder (6) close to the limiting teeth (61), and a plurality of limiting blocks (91) adapted to the limiting openings (62) are arranged at one end of the second saw cylinder (9) close to the shaft seat (8), and the limiting blocks (91) are arranged on the inner side of the second saw cylinder (9) and inserted into the limiting openings (62).

6. A craniotomy saw according to claim 5, characterized in that: It also includes an inner shaft (7), which is coaxially arranged inside the main shaft (5), and the head end of the inner shaft (7) extends out of the main shaft (5) and extends into the first saw cylinder (6), and the head end of the inner shaft (7) is connected to the first saw cylinder (6).

7. A craniotomy saw according to claim 6, characterized in that: A cover cap (102) is provided at the tail end of the main shaft (5), a limiting hole (71) is provided at the tail end of the inner shaft (7), an elastic member (104) is provided in the limiting hole (71), one end of the elastic member (104) abuts against the cover cap (102) and the other end abuts against the inner shaft (7).

8. A craniotomy saw according to claim 7, characterized in that: A slide groove (51) is arranged at the tail end of the main shaft (5) and is arranged toward the inner shaft (7). A sliding block (103) is connected to the tail end of the inner shaft (7). The sliding block (103) can be slidably arranged in the slide groove (51).

9. The craniotomy saw according to claim 3, characterized in that: It also comprises a first housing (11) and a second housing (12), wherein the first housing (11) is mounted on the outer sides of the shaft seat (8), the eccentric shaft (3) and the swinging member (4), the input end of the eccentric shaft (3) is connected to the transmission shaft (2), and the second housing (12) is mounted on the rear end of the main shaft (5) and the outer side of the transmission shaft (2).

10. The craniotomy saw according to claim 1, characterized in that: The invention also comprises a handle (105), wherein a switch button (106) and a battery box (107) are arranged on the handle (105), the driving member is arranged in the handle (105), and the switch button (106) and the battery box (107) are connected to the driving member.

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